Merge branch 'master' of https://github.com/chrislusf/seaweedfs into chrislusf-master

124 files changed, 5390 insertions, 1768 deletions

diff --git a/weed/cluster/cluster.go b/weed/cluster/cluster.go
index fa01bd03d..3cff13724 100644
--- a/weed/cluster/cluster.go
+++ b/weed/cluster/cluster.go
@@ -9,9 +9,10 @@ import (
 )
 
 const (
-	MasterType = "master"
-	FilerType  = "filer"
-	BrokerType = "broker"
+	MasterType       = "master"
+	VolumeServerType = "volumeServer"
+	FilerType        = "filer"
+	BrokerType       = "broker"
 )
 
 type ClusterNode struct {
@@ -80,6 +81,15 @@ func (cluster *Cluster) AddClusterNode(nodeType string, address pb.ServerAddress
 			},
 		}
 	case MasterType:
+		return []*master_pb.KeepConnectedResponse{
+			{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsAdd:    true,
+				},
+			},
+		}
 	}
 	return nil
 }
@@ -119,6 +129,15 @@ func (cluster *Cluster) RemoveClusterNode(nodeType string, address pb.ServerAddr
 			}
 		}
 	case MasterType:
+		return []*master_pb.KeepConnectedResponse{
+			{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsAdd:    false,
+				},
+			},
+		}
 	}
 	return nil
 }
diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index af5919adf..7091463cc 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -129,7 +129,7 @@ func runBenchmark(cmd *Command, args []string) bool {
 		defer pprof.StopCPUProfile()
 	}
 
-	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", "", pb.ServerAddresses(*b.masters).ToAddresses())
+	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", "", pb.ServerAddresses(*b.masters).ToAddressMap())
 	go b.masterClient.KeepConnectedToMaster()
 	b.masterClient.WaitUntilConnected()
 
diff --git a/weed/command/filer.go b/weed/command/filer.go
index 4f8fd947a..4dbc04a0c 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -5,6 +5,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"runtime"
 	"time"
 
 	"google.golang.org/grpc/reflection"
@@ -29,7 +30,7 @@ var (
 )
 
 type FilerOptions struct {
-	masters                 []pb.ServerAddress
+	masters                 map[string]pb.ServerAddress
 	mastersString           *string
 	ip                      *string
 	bindIp                  *string
@@ -89,6 +90,7 @@ func init() {
 	filerS3Options.config = cmdFiler.Flag.String("s3.config", "", "path to the config file")
 	filerS3Options.auditLogConfig = cmdFiler.Flag.String("s3.auditLogConfig", "", "path to the audit log config file")
 	filerS3Options.allowEmptyFolder = cmdFiler.Flag.Bool("s3.allowEmptyFolder", true, "allow empty folders")
+	filerS3Options.allowDeleteBucketNotEmpty = cmdFiler.Flag.Bool("s3.allowDeleteBucketNotEmpty", true, "allow recursive deleting all entries along with bucket")
 
 	// start webdav on filer
 	filerStartWebDav = cmdFiler.Flag.Bool("webdav", false, "whether to start webdav gateway")
@@ -171,7 +173,7 @@ func runFiler(cmd *Command, args []string) bool {
 		}()
 	}
 
-	f.masters = pb.ServerAddresses(*f.mastersString).ToAddresses()
+	f.masters = pb.ServerAddresses(*f.mastersString).ToAddressMap()
 
 	f.startFiler()
 
@@ -247,18 +249,6 @@ func (fo *FilerOptions) startFiler() {
 		glog.Fatalf("Filer listener error: %v", e)
 	}
 
-	// start on local unix socket
-	if *fo.localSocket == "" {
-		*fo.localSocket = fmt.Sprintf("/tmp/seaweefs-filer-%d.sock", *fo.port)
-		if err := os.Remove(*fo.localSocket); err != nil && !os.IsNotExist(err) {
-			glog.Fatalf("Failed to remove %s, error: %s", *fo.localSocket, err.Error())
-		}
-	}
-	filerSocketListener, err := net.Listen("unix", *fo.localSocket)
-	if err != nil {
-		glog.Fatalf("Failed to listen on %s: %v", *fo.localSocket, err)
-	}
-
 	// starting grpc server
 	grpcPort := *fo.portGrpc
 	grpcL, grpcLocalL, err := util.NewIpAndLocalListeners(*fo.bindIp, grpcPort, 0)
@@ -274,9 +264,22 @@ func (fo *FilerOptions) startFiler() {
 	go grpcS.Serve(grpcL)
 
 	httpS := &http.Server{Handler: defaultMux}
-	go func() {
-		httpS.Serve(filerSocketListener)
-	}()
+	if runtime.GOOS != "windows" {
+		if *fo.localSocket == "" {
+			*fo.localSocket = fmt.Sprintf("/tmp/seaweefs-filer-%d.sock", *fo.port)
+			if err := os.Remove(*fo.localSocket); err != nil && !os.IsNotExist(err) {
+				glog.Fatalf("Failed to remove %s, error: %s", *fo.localSocket, err.Error())
+			}
+		}
+		go func() {
+			// start on local unix socket
+			filerSocketListener, err := net.Listen("unix", *fo.localSocket)
+			if err != nil {
+				glog.Fatalf("Failed to listen on %s: %v", *fo.localSocket, err)
+			}
+			httpS.Serve(filerSocketListener)
+		}()
+	}
 	if filerLocalListener != nil {
 		go func() {
 			if err := httpS.Serve(filerLocalListener); err != nil {
diff --git a/weed/command/filer_sync.go b/weed/command/filer_sync.go
index 37ce2aa73..e3d3b97bc 100644
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -267,7 +267,10 @@ func genProcessFunction(sourcePath string, targetPath string, dataSink sink.Repl
 				return nil
 			}
 			key := buildKey(dataSink, message, targetPath, sourceOldKey, sourcePath)
-			return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+			if !dataSink.IsIncremental() {
+				return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+			}
+			return nil
 		}
 
 		// handle new entries
diff --git a/weed/command/iam.go b/weed/command/iam.go
index 88b17b1a2..968d23095 100644
--- a/weed/command/iam.go
+++ b/weed/command/iam.go
@@ -67,7 +67,7 @@ func (iamopt *IamOptions) startIamServer() bool {
 		}
 	}
 
-	masters := pb.ServerAddresses(*iamopt.masters).ToAddresses()
+	masters := pb.ServerAddresses(*iamopt.masters).ToAddressMap()
 	router := mux.NewRouter().SkipClean(true)
 	_, iamApiServer_err := iamapi.NewIamApiServer(router, &iamapi.IamServerOption{
 		Masters:        masters,
diff --git a/weed/command/master.go b/weed/command/master.go
index 9e45c5037..9587df055 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -1,9 +1,9 @@
 package command
 
 import (
+	"golang.org/x/exp/slices"
 	"net/http"
 	"os"
-	"sort"
 	"strings"
 	"time"
 
@@ -48,6 +48,8 @@ type MasterOptions struct {
 	metricsHttpPort    *int
 	heartbeatInterval  *time.Duration
 	electionTimeout    *time.Duration
+	raftHashicorp      *bool
+	raftBootstrap      *bool
 }
 
 func init() {
@@ -71,6 +73,8 @@ func init() {
 	m.raftResumeState = cmdMaster.Flag.Bool("resumeState", false, "resume previous state on start master server")
 	m.heartbeatInterval = cmdMaster.Flag.Duration("heartbeatInterval", 300*time.Millisecond, "heartbeat interval of master servers, and will be randomly multiplied by [1, 1.25)")
 	m.electionTimeout = cmdMaster.Flag.Duration("electionTimeout", 10*time.Second, "election timeout of master servers")
+	m.raftHashicorp = cmdMaster.Flag.Bool("raftHashicorp", false, "use hashicorp raft")
+	m.raftBootstrap = cmdMaster.Flag.Bool("raftBootstrap", false, "Whether to bootstrap the Raft cluster")
 }
 
 var cmdMaster = &Command{
@@ -132,8 +136,13 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 
 	myMasterAddress, peers := checkPeers(*masterOption.ip, *masterOption.port, *masterOption.portGrpc, *masterOption.peers)
 
+	masterPeers := make(map[string]pb.ServerAddress)
+	for _, peer := range peers {
+		masterPeers[string(peer)] = peer
+	}
+
 	r := mux.NewRouter()
-	ms := weed_server.NewMasterServer(r, masterOption.toMasterOption(masterWhiteList), peers)
+	ms := weed_server.NewMasterServer(r, masterOption.toMasterOption(masterWhiteList), masterPeers)
 	listeningAddress := util.JoinHostPort(*masterOption.ipBind, *masterOption.port)
 	glog.V(0).Infof("Start Seaweed Master %s at %s", util.Version(), listeningAddress)
 	masterListener, masterLocalListner, e := util.NewIpAndLocalListeners(*masterOption.ipBind, *masterOption.port, 0)
@@ -144,20 +153,32 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	// start raftServer
 	raftServerOption := &weed_server.RaftServerOption{
 		GrpcDialOption:    security.LoadClientTLS(util.GetViper(), "grpc.master"),
-		Peers:             peers,
+		Peers:             masterPeers,
 		ServerAddr:        myMasterAddress,
 		DataDir:           util.ResolvePath(*masterOption.metaFolder),
 		Topo:              ms.Topo,
 		RaftResumeState:   *masterOption.raftResumeState,
 		HeartbeatInterval: *masterOption.heartbeatInterval,
 		ElectionTimeout:   *masterOption.electionTimeout,
+		RaftBootstrap:     *m.raftBootstrap,
 	}
-	raftServer, err := weed_server.NewRaftServer(raftServerOption)
-	if raftServer == nil {
-		glog.Fatalf("please verify %s is writable, see https://github.com/chrislusf/seaweedfs/issues/717: %s", *masterOption.metaFolder, err)
+	var raftServer *weed_server.RaftServer
+	var err error
+	if *m.raftHashicorp {
+		if raftServer, err = weed_server.NewHashicorpRaftServer(raftServerOption); err != nil {
+			glog.Fatalf("NewHashicorpRaftServer: %s", err)
+		}
+	} else {
+		raftServer, err = weed_server.NewRaftServer(raftServerOption)
+		if raftServer == nil {
+			glog.Fatalf("please verify %s is writable, see https://github.com/chrislusf/seaweedfs/issues/717: %s", *masterOption.metaFolder, err)
+		}
 	}
 	ms.SetRaftServer(raftServer)
 	r.HandleFunc("/cluster/status", raftServer.StatusHandler).Methods("GET")
+	if *m.raftHashicorp {
+		r.HandleFunc("/raft/stats", raftServer.StatsRaftHandler).Methods("GET")
+	}
 	// starting grpc server
 	grpcPort := *masterOption.portGrpc
 	grpcL, grpcLocalL, err := util.NewIpAndLocalListeners(*masterOption.ipBind, grpcPort, 0)
@@ -166,7 +187,11 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	}
 	grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.master"))
 	master_pb.RegisterSeaweedServer(grpcS, ms)
-	protobuf.RegisterRaftServer(grpcS, raftServer)
+	if *m.raftHashicorp {
+		raftServer.TransportManager.Register(grpcS)
+	} else {
+		protobuf.RegisterRaftServer(grpcS, raftServer)
+	}
 	reflection.Register(grpcS)
 	glog.V(0).Infof("Start Seaweed Master %s grpc server at %s:%d", util.Version(), *masterOption.ipBind, grpcPort)
 	if grpcLocalL != nil {
@@ -174,14 +199,17 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	}
 	go grpcS.Serve(grpcL)
 
-	go func() {
-		time.Sleep(1500 * time.Millisecond)
-		if ms.Topo.RaftServer.Leader() == "" && ms.Topo.RaftServer.IsLogEmpty() && isTheFirstOne(myMasterAddress, peers) {
-			if ms.MasterClient.FindLeaderFromOtherPeers(myMasterAddress) == "" {
-				raftServer.DoJoinCommand()
+	timeSleep := 1500 * time.Millisecond
+	if !*m.raftHashicorp {
+		go func() {
+			time.Sleep(timeSleep)
+			if ms.Topo.RaftServer.Leader() == "" && ms.Topo.RaftServer.IsLogEmpty() && isTheFirstOne(myMasterAddress, peers) {
+				if ms.MasterClient.FindLeaderFromOtherPeers(myMasterAddress) == "" {
+					raftServer.DoJoinCommand()
+				}
 			}
-		}
-	}()
+		}()
+	}
 
 	go ms.MasterClient.KeepConnectedToMaster()
 
@@ -246,8 +274,8 @@ func checkPeers(masterIp string, masterPort int, masterGrpcPort int, peers strin
 }
 
 func isTheFirstOne(self pb.ServerAddress, peers []pb.ServerAddress) bool {
-	sort.Slice(peers, func(i, j int) bool {
-		return strings.Compare(string(peers[i]), string(peers[j])) < 0
+	slices.SortFunc(peers, func(a, b pb.ServerAddress) bool {
+		return strings.Compare(string(a), string(b)) < 0
 	})
 	if len(peers) <= 0 {
 		return true
diff --git a/weed/command/master_follower.go b/weed/command/master_follower.go
index f182d7ce4..ec7d2758f 100644
--- a/weed/command/master_follower.go
+++ b/weed/command/master_follower.go
@@ -83,7 +83,7 @@ func runMasterFollower(cmd *Command, args []string) bool {
 func startMasterFollower(masterOptions MasterOptions) {
 
 	// collect settings from main masters
-	masters := pb.ServerAddresses(*mf.peers).ToAddresses()
+	masters := pb.ServerAddresses(*mf.peers).ToAddressMap()
 
 	var err error
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.master")
diff --git a/weed/command/mount.go b/weed/command/mount.go
index 428e073f2..2569bc3dc 100644
--- a/weed/command/mount.go
+++ b/weed/command/mount.go
@@ -29,6 +29,7 @@ type MountOptions struct {
 	readOnly           *bool
 	debug              *bool
 	debugPort          *int
+	localSocket        *string
 }
 
 var (
@@ -63,6 +64,7 @@ func init() {
 	mountOptions.readOnly = cmdMount.Flag.Bool("readOnly", false, "read only")
 	mountOptions.debug = cmdMount.Flag.Bool("debug", false, "serves runtime profiling data, e.g., http://localhost:<debug.port>/debug/pprof/goroutine?debug=2")
 	mountOptions.debugPort = cmdMount.Flag.Int("debug.port", 6061, "http port for debugging")
+	mountOptions.localSocket = cmdMount.Flag.String("localSocket", "", "default to /tmp/seaweedfs-mount-<mount_dir_hash>.sock")
 
 	mountCpuProfile = cmdMount.Flag.String("cpuprofile", "", "cpu profile output file")
 	mountMemProfile = cmdMount.Flag.String("memprofile", "", "memory profile output file")
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index d865e053f..1d929dc96 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -12,9 +12,12 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/mount/unmount"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/hanwen/go-fuse/v2/fuse"
+	"google.golang.org/grpc/reflection"
+	"net"
 	"net/http"
 	"os"
 	"os/user"
@@ -98,6 +101,22 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 
 	unmount.Unmount(dir)
 
+	// start on local unix socket
+	if *option.localSocket == "" {
+		mountDirHash := util.HashToInt32([]byte(dir))
+		if mountDirHash < 0 {
+			mountDirHash = -mountDirHash
+		}
+		*option.localSocket = fmt.Sprintf("/tmp/seaweefs-mount-%d.sock", mountDirHash)
+	}
+	if err := os.Remove(*option.localSocket); err != nil && !os.IsNotExist(err) {
+		glog.Fatalf("Failed to remove %s, error: %s", *option.localSocket, err.Error())
+	}
+	montSocketListener, err := net.Listen("unix", *option.localSocket)
+	if err != nil {
+		glog.Fatalf("Failed to listen on %s: %v", *option.localSocket, err)
+	}
+
 	// detect mount folder mode
 	if *option.dirAutoCreate {
 		os.MkdirAll(dir, os.FileMode(0777)&^umask)
@@ -229,6 +248,11 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		unmount.Unmount(dir)
 	})
 
+	grpcS := pb.NewGrpcServer()
+	mount_pb.RegisterSeaweedMountServer(grpcS, seaweedFileSystem)
+	reflection.Register(grpcS)
+	go grpcS.Serve(montSocketListener)
+
 	seaweedFileSystem.StartBackgroundTasks()
 
 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.Version(), runtime.GOOS, runtime.GOARCH)
diff --git a/weed/command/s3.go b/weed/command/s3.go
index 467da73fd..c28f3016e 100644
--- a/weed/command/s3.go
+++ b/weed/command/s3.go
@@ -24,17 +24,18 @@ var (
 )
 
 type S3Options struct {
-	filer            *string
-	bindIp           *string
-	port             *int
-	config           *string
-	domainName       *string
-	tlsPrivateKey    *string
-	tlsCertificate   *string
-	metricsHttpPort  *int
-	allowEmptyFolder *bool
-	auditLogConfig   *string
-	localFilerSocket *string
+	filer                     *string
+	bindIp                    *string
+	port                      *int
+	config                    *string
+	domainName                *string
+	tlsPrivateKey             *string
+	tlsCertificate            *string
+	metricsHttpPort           *int
+	allowEmptyFolder          *bool
+	allowDeleteBucketNotEmpty *bool
+	auditLogConfig            *string
+	localFilerSocket          *string
 }
 
 func init() {
@@ -49,6 +50,7 @@ func init() {
 	s3StandaloneOptions.tlsCertificate = cmdS3.Flag.String("cert.file", "", "path to the TLS certificate file")
 	s3StandaloneOptions.metricsHttpPort = cmdS3.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 	s3StandaloneOptions.allowEmptyFolder = cmdS3.Flag.Bool("allowEmptyFolder", true, "allow empty folders")
+	s3StandaloneOptions.allowDeleteBucketNotEmpty = cmdS3.Flag.Bool("allowDeleteBucketNotEmpty", true, "allow recursive deleting all entries along with bucket")
 }
 
 var cmdS3 = &Command{
@@ -178,14 +180,15 @@ func (s3opt *S3Options) startS3Server() bool {
 	router := mux.NewRouter().SkipClean(true)
 
 	_, s3ApiServer_err := s3api.NewS3ApiServer(router, &s3api.S3ApiServerOption{
-		Filer:            filerAddress,
-		Port:             *s3opt.port,
-		Config:           *s3opt.config,
-		DomainName:       *s3opt.domainName,
-		BucketsPath:      filerBucketsPath,
-		GrpcDialOption:   grpcDialOption,
-		AllowEmptyFolder: *s3opt.allowEmptyFolder,
-		LocalFilerSocket: s3opt.localFilerSocket,
+		Filer:                     filerAddress,
+		Port:                      *s3opt.port,
+		Config:                    *s3opt.config,
+		DomainName:                *s3opt.domainName,
+		BucketsPath:               filerBucketsPath,
+		GrpcDialOption:            grpcDialOption,
+		AllowEmptyFolder:          *s3opt.allowEmptyFolder,
+		AllowDeleteBucketNotEmpty: *s3opt.allowDeleteBucketNotEmpty,
+		LocalFilerSocket:          s3opt.localFilerSocket,
 	})
 	if s3ApiServer_err != nil {
 		glog.Fatalf("S3 API Server startup error: %v", s3ApiServer_err)
diff --git a/weed/command/server.go b/weed/command/server.go
index a1b495c5f..e3aec67d1 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -138,6 +138,7 @@ func init() {
 	s3Options.config = cmdServer.Flag.String("s3.config", "", "path to the config file")
 	s3Options.auditLogConfig = cmdServer.Flag.String("s3.auditLogConfig", "", "path to the audit log config file")
 	s3Options.allowEmptyFolder = cmdServer.Flag.Bool("s3.allowEmptyFolder", true, "allow empty folders")
+	s3Options.allowDeleteBucketNotEmpty = cmdServer.Flag.Bool("s3.allowDeleteBucketNotEmpty", true, "allow recursive deleting all entries along with bucket")
 
 	iamOptions.port = cmdServer.Flag.Int("iam.port", 8111, "iam server http listen port")
 
@@ -191,7 +192,7 @@ func runServer(cmd *Command, args []string) bool {
 	// ip address
 	masterOptions.ip = serverIp
 	masterOptions.ipBind = serverBindIp
-	filerOptions.masters = pb.ServerAddresses(*masterOptions.peers).ToAddresses()
+	filerOptions.masters = pb.ServerAddresses(*masterOptions.peers).ToAddressMap()
 	filerOptions.ip = serverIp
 	filerOptions.bindIp = serverBindIp
 	s3Options.bindIp = serverBindIp
diff --git a/weed/filer/filechunks.go b/weed/filer/filechunks.go
index fd9694b38..208ef8095 100644
--- a/weed/filer/filechunks.go
+++ b/weed/filer/filechunks.go
@@ -4,8 +4,8 @@ import (
 	"bytes"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
+	"golang.org/x/exp/slices"
 	"math"
-	"sort"
 	"sync"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -23,6 +23,9 @@ func TotalSize(chunks []*filer_pb.FileChunk) (size uint64) {
 }
 
 func FileSize(entry *filer_pb.Entry) (size uint64) {
+	if entry == nil || entry.Attributes == nil {
+		return 0
+	}
 	fileSize := entry.Attributes.FileSize
 	if entry.RemoteEntry != nil {
 		if entry.RemoteEntry.RemoteMtime > entry.Attributes.Mtime {
@@ -251,19 +254,17 @@ func NonOverlappingVisibleIntervals(lookupFileIdFn wdclient.LookupFileIdFunction
 	if true {
 		return visibles2, err
 	}
-
-	sort.Slice(chunks, func(i, j int) bool {
-		if chunks[i].Mtime == chunks[j].Mtime {
-			filer_pb.EnsureFid(chunks[i])
-			filer_pb.EnsureFid(chunks[j])
-			if chunks[i].Fid == nil || chunks[j].Fid == nil {
+	slices.SortFunc(chunks, func(a, b *filer_pb.FileChunk) bool {
+		if a.Mtime == b.Mtime {
+			filer_pb.EnsureFid(a)
+			filer_pb.EnsureFid(b)
+			if a.Fid == nil || b.Fid == nil {
 				return true
 			}
-			return chunks[i].Fid.FileKey < chunks[j].Fid.FileKey
+			return a.Fid.FileKey < b.Fid.FileKey
 		}
-		return chunks[i].Mtime < chunks[j].Mtime // keep this to make tests run
+		return a.Mtime < b.Mtime
 	})
-
 	for _, chunk := range chunks {
 
 		// glog.V(0).Infof("merge [%d,%d)", chunk.Offset, chunk.Offset+int64(chunk.Size))
diff --git a/weed/filer/filechunks2_test.go b/weed/filer/filechunks2_test.go
index 9f9566d9b..39dec87c9 100644
--- a/weed/filer/filechunks2_test.go
+++ b/weed/filer/filechunks2_test.go
@@ -1,7 +1,7 @@
 package filer
 
 import (
-	"sort"
+	"golang.org/x/exp/slices"
 	"testing"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -34,11 +34,11 @@ func TestCompactFileChunksRealCase(t *testing.T) {
 }
 
 func printChunks(name string, chunks []*filer_pb.FileChunk) {
-	sort.Slice(chunks, func(i, j int) bool {
-		if chunks[i].Offset == chunks[j].Offset {
-			return chunks[i].Mtime < chunks[j].Mtime
+	slices.SortFunc(chunks, func(a, b *filer_pb.FileChunk) bool {
+		if a.Offset == b.Offset {
+			return a.Mtime < b.Mtime
 		}
-		return chunks[i].Offset < chunks[j].Offset
+		return a.Offset < b.Offset
 	})
 	for _, chunk := range chunks {
 		glog.V(0).Infof("%s chunk %s [%10d,%10d)", name, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
diff --git a/weed/filer/filechunks_read.go b/weed/filer/filechunks_read.go
index 33ee6d138..1d0bd837a 100644
--- a/weed/filer/filechunks_read.go
+++ b/weed/filer/filechunks_read.go
@@ -2,7 +2,7 @@ package filer
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"sort"
+	"golang.org/x/exp/slices"
 )
 
 func readResolvedChunks(chunks []*filer_pb.FileChunk) (visibles []VisibleInterval) {
@@ -22,17 +22,14 @@ func readResolvedChunks(chunks []*filer_pb.FileChunk) (visibles []VisibleInterva
 			isStart: false,
 		})
 	}
-	sort.Slice(points, func(i, j int) bool {
-		if points[i].x != points[j].x {
-			return points[i].x < points[j].x
+	slices.SortFunc(points, func(a, b *Point) bool {
+		if a.x != b.x {
+			return a.x < b.x
 		}
-		if points[i].ts != points[j].ts {
-			return points[i].ts < points[j].ts
+		if a.ts != b.ts {
+			return a.ts < b.ts
 		}
-		if !points[i].isStart {
-			return true
-		}
-		return false
+		return !a.isStart
 	})
 
 	var prevX int64
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 7b6f1342c..836a0e447 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -49,7 +49,7 @@ type Filer struct {
 	UniqueFileId        uint32
 }
 
-func NewFiler(masters []pb.ServerAddress, grpcDialOption grpc.DialOption,
+func NewFiler(masters map[string]pb.ServerAddress, grpcDialOption grpc.DialOption,
 	filerHost pb.ServerAddress, collection string, replication string, dataCenter string, notifyFn func()) *Filer {
 	f := &Filer{
 		MasterClient:        wdclient.NewMasterClient(grpcDialOption, cluster.FilerType, filerHost, dataCenter, masters),
diff --git a/weed/filer/meta_aggregator.go b/weed/filer/meta_aggregator.go
index 1e8b89ad5..83c8a945d 100644
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@@ -76,9 +76,6 @@ func (ma *MetaAggregator) setActive(address pb.ServerAddress, isActive bool) (no
 		}
 	} else {
 		if _, found := ma.peerStatues[address]; found {
-			ma.peerStatues[address] -= 1
-		}
-		if ma.peerStatues[address] <= 0 {
 			delete(ma.peerStatues, address)
 		}
 	}
diff --git a/weed/filer/redis/universal_redis_store.go b/weed/filer/redis/universal_redis_store.go
index 2cc7f49b1..0cdf58d7f 100644
--- a/weed/filer/redis/universal_redis_store.go
+++ b/weed/filer/redis/universal_redis_store.go
@@ -3,7 +3,7 @@ package redis
 import (
 	"context"
 	"fmt"
-	"sort"
+	"golang.org/x/exp/slices"
 	"strings"
 	"time"
 
@@ -157,8 +157,8 @@ func (store *UniversalRedisStore) ListDirectoryEntries(ctx context.Context, dirP
 	}
 
 	// sort
-	sort.Slice(members, func(i, j int) bool {
-		return strings.Compare(members[i], members[j]) < 0
+	slices.SortFunc(members, func(a, b string) bool {
+		return strings.Compare(a, b) < 0
 	})
 
 	// limit
diff --git a/weed/filer/stream.go b/weed/filer/stream.go
index 36278f0b1..7da9fd0a0 100644
--- a/weed/filer/stream.go
+++ b/weed/filer/stream.go
@@ -3,6 +3,7 @@ package filer
 import (
 	"bytes"
 	"fmt"
+	"golang.org/x/exp/slices"
 	"io"
 	"math"
 	"sort"
@@ -39,11 +40,11 @@ func isSameChunks(a, b []*filer_pb.FileChunk) bool {
 	if len(a) != len(b) {
 		return false
 	}
-	sort.Slice(a, func(i, j int) bool {
-		return strings.Compare(a[i].ETag, a[j].ETag) < 0
+	slices.SortFunc(a, func(i, j *filer_pb.FileChunk) bool {
+		return strings.Compare(i.ETag, j.ETag) < 0
 	})
-	sort.Slice(b, func(i, j int) bool {
-		return strings.Compare(b[i].ETag, b[j].ETag) < 0
+	slices.SortFunc(b, func(i, j *filer_pb.FileChunk) bool {
+		return strings.Compare(i.ETag, j.ETag) < 0
 	})
 	for i := 0; i < len(a); i++ {
 		if a[i].ETag != b[i].ETag {
@@ -179,8 +180,8 @@ var _ = io.ReaderAt(&ChunkStreamReader{})
 func doNewChunkStreamReader(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
 
 	chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, math.MaxInt64)
-	sort.Slice(chunkViews, func(i, j int) bool {
-		return chunkViews[i].LogicOffset < chunkViews[j].LogicOffset
+	slices.SortFunc(chunkViews, func(a, b *ChunkView) bool {
+		return a.LogicOffset < b.LogicOffset
 	})
 
 	var totalSize int64
diff --git a/weed/iamapi/iamapi_management_handlers.go b/weed/iamapi/iamapi_management_handlers.go
index e8092020b..a7ca69f45 100644
--- a/weed/iamapi/iamapi_management_handlers.go
+++ b/weed/iamapi/iamapi_management_handlers.go
@@ -4,10 +4,6 @@ import (
 	"crypto/sha1"
 	"encoding/json"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
-	"github.com/chrislusf/seaweedfs/weed/s3api/s3_constants"
-	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
 	"math/rand"
 	"net/http"
 	"net/url"
@@ -16,6 +12,11 @@ import (
 	"sync"
 	"time"
 
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
+	"github.com/chrislusf/seaweedfs/weed/s3api/s3_constants"
+	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
+
 	"github.com/aws/aws-sdk-go/service/iam"
 )
 
@@ -155,6 +156,22 @@ func (iama *IamApiServer) GetUser(s3cfg *iam_pb.S3ApiConfiguration, userName str
 	return resp, fmt.Errorf(iam.ErrCodeNoSuchEntityException)
 }
 
+func (iama *IamApiServer) UpdateUser(s3cfg *iam_pb.S3ApiConfiguration, values url.Values) (resp UpdateUserResponse, err error) {
+	userName := values.Get("UserName")
+	newUserName := values.Get("NewUserName")
+	if newUserName != "" {
+		for _, ident := range s3cfg.Identities {
+			if userName == ident.Name {
+				ident.Name = newUserName
+				return resp, nil
+			}
+		}
+	} else {
+		return resp, nil
+	}
+	return resp, fmt.Errorf(iam.ErrCodeNoSuchEntityException)
+}
+
 func GetPolicyDocument(policy *string) (policyDocument PolicyDocument, err error) {
 	if err = json.Unmarshal([]byte(*policy), &policyDocument); err != nil {
 		return PolicyDocument{}, err
@@ -396,6 +413,13 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		changed = false
+	case "UpdateUser":
+		response, err = iama.UpdateUser(s3cfg, values)
+		if err != nil {
+			glog.Errorf("UpdateUser: %+v", err)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
+			return
+		}
 	case "DeleteUser":
 		userName := values.Get("UserName")
 		response, err = iama.DeleteUser(s3cfg, userName)
diff --git a/weed/iamapi/iamapi_response.go b/weed/iamapi/iamapi_response.go
index 77328b608..df9443f0d 100644
--- a/weed/iamapi/iamapi_response.go
+++ b/weed/iamapi/iamapi_response.go
@@ -66,6 +66,11 @@ type GetUserResponse struct {
 	} `xml:"GetUserResult"`
 }
 
+type UpdateUserResponse struct {
+	CommonResponse
+	XMLName xml.Name `xml:"https://iam.amazonaws.com/doc/2010-05-08/ UpdateUserResponse"`
+}
+
 type CreateAccessKeyResponse struct {
 	CommonResponse
 	XMLName               xml.Name `xml:"https://iam.amazonaws.com/doc/2010-05-08/ CreateAccessKeyResponse"`
diff --git a/weed/iamapi/iamapi_server.go b/weed/iamapi/iamapi_server.go
index fc0e6b700..6f6cc7533 100644
--- a/weed/iamapi/iamapi_server.go
+++ b/weed/iamapi/iamapi_server.go
@@ -33,7 +33,7 @@ type IamS3ApiConfigure struct {
 }
 
 type IamServerOption struct {
-	Masters        []pb.ServerAddress
+	Masters        map[string]pb.ServerAddress
 	Filer          pb.ServerAddress
 	Port           int
 	GrpcDialOption grpc.DialOption
diff --git a/weed/iamapi/iamapi_test.go b/weed/iamapi/iamapi_test.go
index 09aaf0ac8..5b21e4293 100644
--- a/weed/iamapi/iamapi_test.go
+++ b/weed/iamapi/iamapi_test.go
@@ -2,6 +2,10 @@ package iamapi
 
 import (
 	"encoding/xml"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/iam"
@@ -9,9 +13,6 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/jinzhu/copier"
 	"github.com/stretchr/testify/assert"
-	"net/http"
-	"net/http/httptest"
-	"testing"
 )
 
 var GetS3ApiConfiguration func(s3cfg *iam_pb.S3ApiConfiguration) (err error)
@@ -161,8 +162,20 @@ func TestGetUserPolicy(t *testing.T) {
 	assert.Equal(t, http.StatusOK, response.Code)
 }
 
-func TestDeleteUser(t *testing.T) {
+func TestUpdateUser(t *testing.T) {
 	userName := aws.String("Test")
+	newUserName := aws.String("Test-New")
+	params := &iam.UpdateUserInput{NewUserName: newUserName, UserName: userName}
+	req, _ := iam.New(session.New()).UpdateUserRequest(params)
+	_ = req.Build()
+	out := UpdateUserResponse{}
+	response, err := executeRequest(req.HTTPRequest, out)
+	assert.Equal(t, nil, err)
+	assert.Equal(t, http.StatusOK, response.Code)
+}
+
+func TestDeleteUser(t *testing.T) {
+	userName := aws.String("Test-New")
 	params := &iam.DeleteUserInput{UserName: userName}
 	req, _ := iam.New(session.New()).DeleteUserRequest(params)
 	_ = req.Build()
diff --git a/weed/mount/filehandle.go b/weed/mount/filehandle.go
index 86fbabfa7..8ce31a078 100644
--- a/weed/mount/filehandle.go
+++ b/weed/mount/filehandle.go
@@ -5,8 +5,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"golang.org/x/exp/slices"
 	"io"
-	"sort"
 	"sync"
 )
 
@@ -76,8 +76,8 @@ func (fh *FileHandle) addChunks(chunks []*filer_pb.FileChunk) {
 	}
 
 	// sort incoming chunks
-	sort.Slice(chunks, func(i, j int) bool {
-		return lessThan(chunks[i], chunks[j])
+	slices.SortFunc(chunks, func(a, b *filer_pb.FileChunk) bool {
+		return lessThan(a, b)
 	})
 
 	glog.V(4).Infof("%s existing %d chunks adds %d more", fh.FullPath(), len(fh.entry.Chunks), len(chunks))
diff --git a/weed/mount/filehandle_map.go b/weed/mount/filehandle_map.go
index a8af391af..e6e2d15c9 100644
--- a/weed/mount/filehandle_map.go
+++ b/weed/mount/filehandle_map.go
@@ -49,6 +49,7 @@ func (i *FileHandleToInode) AcquireFileHandle(wfs *WFS, inode uint64, entry *fil
 	} else {
 		fh.counter++
 	}
+	fh.entry = entry
 	return fh
 }
 
diff --git a/weed/mount/page_writer/page_chunk_swapfile.go b/weed/mount/page_writer/page_chunk_swapfile.go
index c70f8c5a1..b56589bfc 100644
--- a/weed/mount/page_writer/page_chunk_swapfile.go
+++ b/weed/mount/page_writer/page_chunk_swapfile.go
@@ -5,6 +5,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/mem"
 	"os"
+	"sync"
 )
 
 var (
@@ -14,11 +15,12 @@ var (
 type ActualChunkIndex int
 
 type SwapFile struct {
-	dir                     string
-	file                    *os.File
-	logicToActualChunkIndex map[LogicChunkIndex]ActualChunkIndex
-	chunkSize               int64
-	freeActualChunkList     []ActualChunkIndex
+	dir                         string
+	file                        *os.File
+	logicToActualChunkIndex     map[LogicChunkIndex]ActualChunkIndex
+	logicToActualChunkIndexLock sync.Mutex
+	chunkSize                   int64
+	freeActualChunkList         []ActualChunkIndex
 }
 
 type SwapFileChunk struct {
@@ -52,6 +54,8 @@ func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapF
 			return nil
 		}
 	}
+	sf.logicToActualChunkIndexLock.Lock()
+	defer sf.logicToActualChunkIndexLock.Unlock()
 	actualChunkIndex, found := sf.logicToActualChunkIndex[logicChunkIndex]
 	if !found {
 		if len(sf.freeActualChunkList) > 0 {
@@ -72,6 +76,9 @@ func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapF
 }
 
 func (sc *SwapFileChunk) FreeResource() {
+	sc.swapfile.logicToActualChunkIndexLock.Lock()
+	defer sc.swapfile.logicToActualChunkIndexLock.Unlock()
+
 	sc.swapfile.freeActualChunkList = append(sc.swapfile.freeActualChunkList, sc.actualChunkIndex)
 	delete(sc.swapfile.logicToActualChunkIndex, sc.logicChunkIndex)
 }
diff --git a/weed/mount/page_writer/upload_pipeline.go b/weed/mount/page_writer/upload_pipeline.go
index e084ca58f..0c7446cad 100644
--- a/weed/mount/page_writer/upload_pipeline.go
+++ b/weed/mount/page_writer/upload_pipeline.go
@@ -187,6 +187,9 @@ func (up *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex Logic
 
 func (up *UploadPipeline) Shutdown() {
 	up.swapFile.FreeResource()
+
+	up.sealedChunksLock.Lock()
+	defer up.sealedChunksLock.Unlock()
 	for logicChunkIndex, sealedChunk := range up.sealedChunks {
 		sealedChunk.FreeReference(fmt.Sprintf("%s uploadpipeline shutdown chunk %d", up.filepath, logicChunkIndex))
 	}
diff --git a/weed/mount/weedfs.go b/weed/mount/weedfs.go
index 195a5bb27..2e22e3589 100644
--- a/weed/mount/weedfs.go
+++ b/weed/mount/weedfs.go
@@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/mount/meta_cache"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
@@ -59,6 +60,7 @@ type WFS struct {
 	// https://dl.acm.org/doi/fullHtml/10.1145/3310148
 	// follow https://github.com/hanwen/go-fuse/blob/master/fuse/api.go
 	fuse.RawFileSystem
+	mount_pb.UnimplementedSeaweedMountServer
 	fs.Inode
 	option            *Option
 	metaCache         *meta_cache.MetaCache
@@ -129,6 +131,9 @@ func (wfs *WFS) maybeReadEntry(inode uint64) (path util.FullPath, fh *FileHandle
 	}
 	var found bool
 	if fh, found = wfs.fhmap.FindFileHandle(inode); found {
+		if fh.entry.Attributes == nil {
+			fh.entry.Attributes = &filer_pb.FuseAttributes{}
+		}
 		return path, fh, fh.entry, fuse.OK
 	}
 	entry, status = wfs.maybeLoadEntry(path)
diff --git a/weed/mount/weedfs_attr.go b/weed/mount/weedfs_attr.go
index 55a29542a..cb935d0e4 100644
--- a/weed/mount/weedfs_attr.go
+++ b/weed/mount/weedfs_attr.go
@@ -98,15 +98,14 @@ func (wfs *WFS) SetAttr(cancel <-chan struct{}, input *fuse.SetAttrIn, out *fuse
 		}
 	}
 
-	if mtime, ok := input.GetMTime(); ok {
-		entry.Attributes.Mtime = mtime.Unix()
-	}
-
 	if atime, ok := input.GetATime(); ok {
 		entry.Attributes.Mtime = atime.Unix()
 	}
 
-	entry.Attributes.Mtime = time.Now().Unix()
+	if mtime, ok := input.GetMTime(); ok {
+		entry.Attributes.Mtime = mtime.Unix()
+	}
+
 	out.AttrValid = 1
 	wfs.setAttrByPbEntry(&out.Attr, input.NodeId, entry)
 
diff --git a/weed/mount/weedfs_filehandle.go b/weed/mount/weedfs_filehandle.go
index 18bfe07f2..2d06acbb3 100644
--- a/weed/mount/weedfs_filehandle.go
+++ b/weed/mount/weedfs_filehandle.go
@@ -10,7 +10,6 @@ func (wfs *WFS) AcquireHandle(inode uint64, uid, gid uint32) (fileHandle *FileHa
 	_, _, entry, status = wfs.maybeReadEntry(inode)
 	if status == fuse.OK {
 		fileHandle = wfs.fhmap.AcquireFileHandle(wfs, inode, entry)
-		fileHandle.entry = entry
 	}
 	return
 }
diff --git a/weed/mount/weedfs_grpc_server.go b/weed/mount/weedfs_grpc_server.go
new file mode 100644
index 000000000..4b2fdffa6
--- /dev/null
+++ b/weed/mount/weedfs_grpc_server.go
@@ -0,0 +1,17 @@
+package mount
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
+)
+
+func (wfs *WFS) Configure(ctx context.Context, request *mount_pb.ConfigureRequest) (*mount_pb.ConfigureResponse, error) {
+	if wfs.option.Collection == "" {
+		return nil, fmt.Errorf("mount quota only works when mounted to a new folder with a collection")
+	}
+	glog.V(0).Infof("quota changed from %d to %d", wfs.option.Quota, request.CollectionCapacity)
+	wfs.option.Quota = request.GetCollectionCapacity()
+	return &mount_pb.ConfigureResponse{}, nil
+}
diff --git a/weed/mount/weedfs_quota.go b/weed/mount/weedfs_quota.go
index f9307a6b3..ac3e58e62 100644
--- a/weed/mount/weedfs_quota.go
+++ b/weed/mount/weedfs_quota.go
@@ -10,12 +10,14 @@ import (
 
 func (wfs *WFS) loopCheckQuota() {
 
-	if wfs.option.Quota <= 0 {
-		return
-	}
-
 	for {
 
+		time.Sleep(61 * time.Second)
+
+		if wfs.option.Quota <= 0 {
+			continue
+		}
+
 		err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 
 			request := &filer_pb.StatisticsRequest{
@@ -47,7 +49,6 @@ func (wfs *WFS) loopCheckQuota() {
 			glog.Warningf("read quota usage: %v", err)
 		}
 
-		time.Sleep(61 * time.Second)
 	}
 
 }
diff --git a/weed/pb/Makefile b/weed/pb/Makefile
index dc27172b6..954b4cb98 100644
--- a/weed/pb/Makefile
+++ b/weed/pb/Makefile
@@ -8,6 +8,7 @@ gen:
 	protoc filer.proto --go_out=./filer_pb --go-grpc_out=./filer_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc remote.proto --go_out=./remote_pb --go-grpc_out=./remote_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc iam.proto --go_out=./iam_pb --go-grpc_out=./iam_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
+	protoc mount.proto --go_out=./mount_pb --go-grpc_out=./mount_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc messaging.proto --go_out=./messaging_pb --go-grpc_out=./messaging_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	# protoc filer.proto --java_out=../../other/java/client/src/main/java
 	cp filer.proto ../../other/java/client/src/main/proto
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 389332114..11be522e7 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -48,6 +48,9 @@ service SeaweedFiler {
     rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
     }
 
+    rpc Ping (PingRequest) returns (PingResponse) {
+    }
+
     rpc GetFilerConfiguration (GetFilerConfigurationRequest) returns (GetFilerConfigurationResponse) {
     }
 
@@ -311,6 +314,16 @@ message StatisticsResponse {
     uint64 file_count = 6;
 }
 
+message PingRequest {
+    string target = 1; // default to ping itself
+    string target_type = 2;
+}
+message PingResponse {
+    int64 start_time_ns = 1;
+    int64 remote_time_ns = 2;
+    int64 stop_time_ns = 3;
+}
+
 message GetFilerConfigurationRequest {
 }
 message GetFilerConfigurationResponse {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index e9628ce57..cd01637c7 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.3
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: filer.proto
 
 package filer_pb
@@ -2524,6 +2524,124 @@ func (x *StatisticsResponse) GetFileCount() uint64 {
 	return 0
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[37]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[37]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{37}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	StartTimeNs  int64 `protobuf:"varint,1,opt,name=start_time_ns,json=startTimeNs,proto3" json:"start_time_ns,omitempty"`
+	RemoteTimeNs int64 `protobuf:"varint,2,opt,name=remote_time_ns,json=remoteTimeNs,proto3" json:"remote_time_ns,omitempty"`
+	StopTimeNs   int64 `protobuf:"varint,3,opt,name=stop_time_ns,json=stopTimeNs,proto3" json:"stop_time_ns,omitempty"`
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[38]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{38}
+}
+
+func (x *PingResponse) GetStartTimeNs() int64 {
+	if x != nil {
+		return x.StartTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetRemoteTimeNs() int64 {
+	if x != nil {
+		return x.RemoteTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetStopTimeNs() int64 {
+	if x != nil {
+		return x.StopTimeNs
+	}
+	return 0
+}
+
 type GetFilerConfigurationRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2533,7 +2651,7 @@ type GetFilerConfigurationRequest struct {
 func (x *GetFilerConfigurationRequest) Reset() {
 	*x = GetFilerConfigurationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[37]
+		mi := &file_filer_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2546,7 +2664,7 @@ func (x *GetFilerConfigurationRequest) String() string {
 func (*GetFilerConfigurationRequest) ProtoMessage() {}
 
 func (x *GetFilerConfigurationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[37]
+	mi := &file_filer_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2559,7 +2677,7 @@ func (x *GetFilerConfigurationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFilerConfigurationRequest.ProtoReflect.Descriptor instead.
 func (*GetFilerConfigurationRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{37}
+	return file_filer_proto_rawDescGZIP(), []int{39}
 }
 
 type GetFilerConfigurationResponse struct {
@@ -2583,7 +2701,7 @@ type GetFilerConfigurationResponse struct {
 func (x *GetFilerConfigurationResponse) Reset() {
 	*x = GetFilerConfigurationResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[38]
+		mi := &file_filer_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2596,7 +2714,7 @@ func (x *GetFilerConfigurationResponse) String() string {
 func (*GetFilerConfigurationResponse) ProtoMessage() {}
 
 func (x *GetFilerConfigurationResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[38]
+	mi := &file_filer_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2609,7 +2727,7 @@ func (x *GetFilerConfigurationResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFilerConfigurationResponse.ProtoReflect.Descriptor instead.
 func (*GetFilerConfigurationResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{38}
+	return file_filer_proto_rawDescGZIP(), []int{40}
 }
 
 func (x *GetFilerConfigurationResponse) GetMasters() []string {
@@ -2705,7 +2823,7 @@ type SubscribeMetadataRequest struct {
 func (x *SubscribeMetadataRequest) Reset() {
 	*x = SubscribeMetadataRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[39]
+		mi := &file_filer_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2718,7 +2836,7 @@ func (x *SubscribeMetadataRequest) String() string {
 func (*SubscribeMetadataRequest) ProtoMessage() {}
 
 func (x *SubscribeMetadataRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[39]
+	mi := &file_filer_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2731,7 +2849,7 @@ func (x *SubscribeMetadataRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeMetadataRequest.ProtoReflect.Descriptor instead.
 func (*SubscribeMetadataRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{39}
+	return file_filer_proto_rawDescGZIP(), []int{41}
 }
 
 func (x *SubscribeMetadataRequest) GetClientName() string {
@@ -2789,7 +2907,7 @@ type SubscribeMetadataResponse struct {
 func (x *SubscribeMetadataResponse) Reset() {
 	*x = SubscribeMetadataResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[40]
+		mi := &file_filer_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2802,7 +2920,7 @@ func (x *SubscribeMetadataResponse) String() string {
 func (*SubscribeMetadataResponse) ProtoMessage() {}
 
 func (x *SubscribeMetadataResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[40]
+	mi := &file_filer_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2815,7 +2933,7 @@ func (x *SubscribeMetadataResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeMetadataResponse.ProtoReflect.Descriptor instead.
 func (*SubscribeMetadataResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{40}
+	return file_filer_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *SubscribeMetadataResponse) GetDirectory() string {
@@ -2852,7 +2970,7 @@ type LogEntry struct {
 func (x *LogEntry) Reset() {
 	*x = LogEntry{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[41]
+		mi := &file_filer_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2865,7 +2983,7 @@ func (x *LogEntry) String() string {
 func (*LogEntry) ProtoMessage() {}
 
 func (x *LogEntry) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[41]
+	mi := &file_filer_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2878,7 +2996,7 @@ func (x *LogEntry) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LogEntry.ProtoReflect.Descriptor instead.
 func (*LogEntry) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{41}
+	return file_filer_proto_rawDescGZIP(), []int{43}
 }
 
 func (x *LogEntry) GetTsNs() int64 {
@@ -2915,7 +3033,7 @@ type KeepConnectedRequest struct {
 func (x *KeepConnectedRequest) Reset() {
 	*x = KeepConnectedRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[42]
+		mi := &file_filer_proto_msgTypes[44]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2928,7 +3046,7 @@ func (x *KeepConnectedRequest) String() string {
 func (*KeepConnectedRequest) ProtoMessage() {}
 
 func (x *KeepConnectedRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[42]
+	mi := &file_filer_proto_msgTypes[44]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2941,7 +3059,7 @@ func (x *KeepConnectedRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KeepConnectedRequest.ProtoReflect.Descriptor instead.
 func (*KeepConnectedRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{42}
+	return file_filer_proto_rawDescGZIP(), []int{44}
 }
 
 func (x *KeepConnectedRequest) GetName() string {
@@ -2974,7 +3092,7 @@ type KeepConnectedResponse struct {
 func (x *KeepConnectedResponse) Reset() {
 	*x = KeepConnectedResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[43]
+		mi := &file_filer_proto_msgTypes[45]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2987,7 +3105,7 @@ func (x *KeepConnectedResponse) String() string {
 func (*KeepConnectedResponse) ProtoMessage() {}
 
 func (x *KeepConnectedResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[43]
+	mi := &file_filer_proto_msgTypes[45]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3000,7 +3118,7 @@ func (x *KeepConnectedResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KeepConnectedResponse.ProtoReflect.Descriptor instead.
 func (*KeepConnectedResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{43}
+	return file_filer_proto_rawDescGZIP(), []int{45}
 }
 
 type LocateBrokerRequest struct {
@@ -3014,7 +3132,7 @@ type LocateBrokerRequest struct {
 func (x *LocateBrokerRequest) Reset() {
 	*x = LocateBrokerRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[44]
+		mi := &file_filer_proto_msgTypes[46]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3027,7 +3145,7 @@ func (x *LocateBrokerRequest) String() string {
 func (*LocateBrokerRequest) ProtoMessage() {}
 
 func (x *LocateBrokerRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[44]
+	mi := &file_filer_proto_msgTypes[46]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3040,7 +3158,7 @@ func (x *LocateBrokerRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerRequest.ProtoReflect.Descriptor instead.
 func (*LocateBrokerRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{44}
+	return file_filer_proto_rawDescGZIP(), []int{46}
 }
 
 func (x *LocateBrokerRequest) GetResource() string {
@@ -3062,7 +3180,7 @@ type LocateBrokerResponse struct {
 func (x *LocateBrokerResponse) Reset() {
 	*x = LocateBrokerResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[45]
+		mi := &file_filer_proto_msgTypes[47]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3075,7 +3193,7 @@ func (x *LocateBrokerResponse) String() string {
 func (*LocateBrokerResponse) ProtoMessage() {}
 
 func (x *LocateBrokerResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[45]
+	mi := &file_filer_proto_msgTypes[47]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3088,7 +3206,7 @@ func (x *LocateBrokerResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerResponse.ProtoReflect.Descriptor instead.
 func (*LocateBrokerResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{45}
+	return file_filer_proto_rawDescGZIP(), []int{47}
 }
 
 func (x *LocateBrokerResponse) GetFound() bool {
@@ -3119,7 +3237,7 @@ type KvGetRequest struct {
 func (x *KvGetRequest) Reset() {
 	*x = KvGetRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[46]
+		mi := &file_filer_proto_msgTypes[48]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3132,7 +3250,7 @@ func (x *KvGetRequest) String() string {
 func (*KvGetRequest) ProtoMessage() {}
 
 func (x *KvGetRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[46]
+	mi := &file_filer_proto_msgTypes[48]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3145,7 +3263,7 @@ func (x *KvGetRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvGetRequest.ProtoReflect.Descriptor instead.
 func (*KvGetRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{46}
+	return file_filer_proto_rawDescGZIP(), []int{48}
 }
 
 func (x *KvGetRequest) GetKey() []byte {
@@ -3167,7 +3285,7 @@ type KvGetResponse struct {
 func (x *KvGetResponse) Reset() {
 	*x = KvGetResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[47]
+		mi := &file_filer_proto_msgTypes[49]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3180,7 +3298,7 @@ func (x *KvGetResponse) String() string {
 func (*KvGetResponse) ProtoMessage() {}
 
 func (x *KvGetResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[47]
+	mi := &file_filer_proto_msgTypes[49]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3193,7 +3311,7 @@ func (x *KvGetResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvGetResponse.ProtoReflect.Descriptor instead.
 func (*KvGetResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{47}
+	return file_filer_proto_rawDescGZIP(), []int{49}
 }
 
 func (x *KvGetResponse) GetValue() []byte {
@@ -3222,7 +3340,7 @@ type KvPutRequest struct {
 func (x *KvPutRequest) Reset() {
 	*x = KvPutRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[48]
+		mi := &file_filer_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3235,7 +3353,7 @@ func (x *KvPutRequest) String() string {
 func (*KvPutRequest) ProtoMessage() {}
 
 func (x *KvPutRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[48]
+	mi := &file_filer_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3248,7 +3366,7 @@ func (x *KvPutRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvPutRequest.ProtoReflect.Descriptor instead.
 func (*KvPutRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{48}
+	return file_filer_proto_rawDescGZIP(), []int{50}
 }
 
 func (x *KvPutRequest) GetKey() []byte {
@@ -3276,7 +3394,7 @@ type KvPutResponse struct {
 func (x *KvPutResponse) Reset() {
 	*x = KvPutResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[49]
+		mi := &file_filer_proto_msgTypes[51]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3289,7 +3407,7 @@ func (x *KvPutResponse) String() string {
 func (*KvPutResponse) ProtoMessage() {}
 
 func (x *KvPutResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[49]
+	mi := &file_filer_proto_msgTypes[51]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3302,7 +3420,7 @@ func (x *KvPutResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvPutResponse.ProtoReflect.Descriptor instead.
 func (*KvPutResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{49}
+	return file_filer_proto_rawDescGZIP(), []int{51}
 }
 
 func (x *KvPutResponse) GetError() string {
@@ -3327,7 +3445,7 @@ type FilerConf struct {
 func (x *FilerConf) Reset() {
 	*x = FilerConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[50]
+		mi := &file_filer_proto_msgTypes[52]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3340,7 +3458,7 @@ func (x *FilerConf) String() string {
 func (*FilerConf) ProtoMessage() {}
 
 func (x *FilerConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[50]
+	mi := &file_filer_proto_msgTypes[52]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3353,7 +3471,7 @@ func (x *FilerConf) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use FilerConf.ProtoReflect.Descriptor instead.
 func (*FilerConf) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50}
+	return file_filer_proto_rawDescGZIP(), []int{52}
 }
 
 func (x *FilerConf) GetVersion() int32 {
@@ -3385,7 +3503,7 @@ type CacheRemoteObjectToLocalClusterRequest struct {
 func (x *CacheRemoteObjectToLocalClusterRequest) Reset() {
 	*x = CacheRemoteObjectToLocalClusterRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[51]
+		mi := &file_filer_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3398,7 +3516,7 @@ func (x *CacheRemoteObjectToLocalClusterRequest) String() string {
 func (*CacheRemoteObjectToLocalClusterRequest) ProtoMessage() {}
 
 func (x *CacheRemoteObjectToLocalClusterRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[51]
+	mi := &file_filer_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3411,7 +3529,7 @@ func (x *CacheRemoteObjectToLocalClusterRequest) ProtoReflect() protoreflect.Mes
 
 // Deprecated: Use CacheRemoteObjectToLocalClusterRequest.ProtoReflect.Descriptor instead.
 func (*CacheRemoteObjectToLocalClusterRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{51}
+	return file_filer_proto_rawDescGZIP(), []int{53}
 }
 
 func (x *CacheRemoteObjectToLocalClusterRequest) GetDirectory() string {
@@ -3439,7 +3557,7 @@ type CacheRemoteObjectToLocalClusterResponse struct {
 func (x *CacheRemoteObjectToLocalClusterResponse) Reset() {
 	*x = CacheRemoteObjectToLocalClusterResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[52]
+		mi := &file_filer_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3452,7 +3570,7 @@ func (x *CacheRemoteObjectToLocalClusterResponse) String() string {
 func (*CacheRemoteObjectToLocalClusterResponse) ProtoMessage() {}
 
 func (x *CacheRemoteObjectToLocalClusterResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[52]
+	mi := &file_filer_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3465,7 +3583,7 @@ func (x *CacheRemoteObjectToLocalClusterResponse) ProtoReflect() protoreflect.Me
 
 // Deprecated: Use CacheRemoteObjectToLocalClusterResponse.ProtoReflect.Descriptor instead.
 func (*CacheRemoteObjectToLocalClusterResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{52}
+	return file_filer_proto_rawDescGZIP(), []int{54}
 }
 
 func (x *CacheRemoteObjectToLocalClusterResponse) GetEntry() *Entry {
@@ -3489,7 +3607,7 @@ type LocateBrokerResponse_Resource struct {
 func (x *LocateBrokerResponse_Resource) Reset() {
 	*x = LocateBrokerResponse_Resource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[55]
+		mi := &file_filer_proto_msgTypes[57]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3502,7 +3620,7 @@ func (x *LocateBrokerResponse_Resource) String() string {
 func (*LocateBrokerResponse_Resource) ProtoMessage() {}
 
 func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[55]
+	mi := &file_filer_proto_msgTypes[57]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3515,7 +3633,7 @@ func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerResponse_Resource.ProtoReflect.Descriptor instead.
 func (*LocateBrokerResponse_Resource) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{45, 0}
+	return file_filer_proto_rawDescGZIP(), []int{47, 0}
 }
 
 func (x *LocateBrokerResponse_Resource) GetGrpcAddresses() string {
@@ -3553,7 +3671,7 @@ type FilerConf_PathConf struct {
 func (x *FilerConf_PathConf) Reset() {
 	*x = FilerConf_PathConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[56]
+		mi := &file_filer_proto_msgTypes[58]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3566,7 +3684,7 @@ func (x *FilerConf_PathConf) String() string {
 func (*FilerConf_PathConf) ProtoMessage() {}
 
 func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[56]
+	mi := &file_filer_proto_msgTypes[58]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3579,7 +3697,7 @@ func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use FilerConf_PathConf.ProtoReflect.Descriptor instead.
 func (*FilerConf_PathConf) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50, 0}
+	return file_filer_proto_rawDescGZIP(), []int{52, 0}
 }
 
 func (x *FilerConf_PathConf) GetLocationPrefix() string {
@@ -4002,260 +4120,276 @@ var file_filer_proto_rawDesc = []byte{
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 }
 
 var (
@@ -4270,7 +4404,7 @@ func file_filer_proto_rawDescGZIP() []byte {
 	return file_filer_proto_rawDescData
 }
 
-var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 57)
+var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 59)
 var file_filer_proto_goTypes = []interface{}{
 	(*LookupDirectoryEntryRequest)(nil),             // 0: filer_pb.LookupDirectoryEntryRequest
 	(*LookupDirectoryEntryResponse)(nil),            // 1: filer_pb.LookupDirectoryEntryResponse
@@ -4309,33 +4443,35 @@ var file_filer_proto_goTypes = []interface{}{
 	(*DeleteCollectionResponse)(nil),                // 34: filer_pb.DeleteCollectionResponse
 	(*StatisticsRequest)(nil),                       // 35: filer_pb.StatisticsRequest
 	(*StatisticsResponse)(nil),                      // 36: filer_pb.StatisticsResponse
-	(*GetFilerConfigurationRequest)(nil),            // 37: filer_pb.GetFilerConfigurationRequest
-	(*GetFilerConfigurationResponse)(nil),           // 38: filer_pb.GetFilerConfigurationResponse
-	(*SubscribeMetadataRequest)(nil),                // 39: filer_pb.SubscribeMetadataRequest
-	(*SubscribeMetadataResponse)(nil),               // 40: filer_pb.SubscribeMetadataResponse
-	(*LogEntry)(nil),                                // 41: filer_pb.LogEntry
-	(*KeepConnectedRequest)(nil),                    // 42: filer_pb.KeepConnectedRequest
-	(*KeepConnectedResponse)(nil),                   // 43: filer_pb.KeepConnectedResponse
-	(*LocateBrokerRequest)(nil),                     // 44: filer_pb.LocateBrokerRequest
-	(*LocateBrokerResponse)(nil),                    // 45: filer_pb.LocateBrokerResponse
-	(*KvGetRequest)(nil),                            // 46: filer_pb.KvGetRequest
-	(*KvGetResponse)(nil),                           // 47: filer_pb.KvGetResponse
-	(*KvPutRequest)(nil),                            // 48: filer_pb.KvPutRequest
-	(*KvPutResponse)(nil),                           // 49: filer_pb.KvPutResponse
-	(*FilerConf)(nil),                               // 50: filer_pb.FilerConf
-	(*CacheRemoteObjectToLocalClusterRequest)(nil),  // 51: filer_pb.CacheRemoteObjectToLocalClusterRequest
-	(*CacheRemoteObjectToLocalClusterResponse)(nil), // 52: filer_pb.CacheRemoteObjectToLocalClusterResponse
-	nil,                                   // 53: filer_pb.Entry.ExtendedEntry
-	nil,                                   // 54: filer_pb.LookupVolumeResponse.LocationsMapEntry
-	(*LocateBrokerResponse_Resource)(nil), // 55: filer_pb.LocateBrokerResponse.Resource
-	(*FilerConf_PathConf)(nil),            // 56: filer_pb.FilerConf.PathConf
+	(*PingRequest)(nil),                             // 37: filer_pb.PingRequest
+	(*PingResponse)(nil),                            // 38: filer_pb.PingResponse
+	(*GetFilerConfigurationRequest)(nil),            // 39: filer_pb.GetFilerConfigurationRequest
+	(*GetFilerConfigurationResponse)(nil),           // 40: filer_pb.GetFilerConfigurationResponse
+	(*SubscribeMetadataRequest)(nil),                // 41: filer_pb.SubscribeMetadataRequest
+	(*SubscribeMetadataResponse)(nil),               // 42: filer_pb.SubscribeMetadataResponse
+	(*LogEntry)(nil),                                // 43: filer_pb.LogEntry
+	(*KeepConnectedRequest)(nil),                    // 44: filer_pb.KeepConnectedRequest
+	(*KeepConnectedResponse)(nil),                   // 45: filer_pb.KeepConnectedResponse
+	(*LocateBrokerRequest)(nil),                     // 46: filer_pb.LocateBrokerRequest
+	(*LocateBrokerResponse)(nil),                    // 47: filer_pb.LocateBrokerResponse
+	(*KvGetRequest)(nil),                            // 48: filer_pb.KvGetRequest
+	(*KvGetResponse)(nil),                           // 49: filer_pb.KvGetResponse
+	(*KvPutRequest)(nil),                            // 50: filer_pb.KvPutRequest
+	(*KvPutResponse)(nil),                           // 51: filer_pb.KvPutResponse
+	(*FilerConf)(nil),                               // 52: filer_pb.FilerConf
+	(*CacheRemoteObjectToLocalClusterRequest)(nil),  // 53: filer_pb.CacheRemoteObjectToLocalClusterRequest
+	(*CacheRemoteObjectToLocalClusterResponse)(nil), // 54: filer_pb.CacheRemoteObjectToLocalClusterResponse
+	nil,                                   // 55: filer_pb.Entry.ExtendedEntry
+	nil,                                   // 56: filer_pb.LookupVolumeResponse.LocationsMapEntry
+	(*LocateBrokerResponse_Resource)(nil), // 57: filer_pb.LocateBrokerResponse.Resource
+	(*FilerConf_PathConf)(nil),            // 58: filer_pb.FilerConf.PathConf
 }
 var file_filer_proto_depIdxs = []int32{
 	5,  // 0: filer_pb.LookupDirectoryEntryResponse.entry:type_name -> filer_pb.Entry
 	5,  // 1: filer_pb.ListEntriesResponse.entry:type_name -> filer_pb.Entry
 	8,  // 2: filer_pb.Entry.chunks:type_name -> filer_pb.FileChunk
 	11, // 3: filer_pb.Entry.attributes:type_name -> filer_pb.FuseAttributes
-	53, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
+	55, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
 	4,  // 5: filer_pb.Entry.remote_entry:type_name -> filer_pb.RemoteEntry
 	5,  // 6: filer_pb.FullEntry.entry:type_name -> filer_pb.Entry
 	5,  // 7: filer_pb.EventNotification.old_entry:type_name -> filer_pb.Entry
@@ -4349,11 +4485,11 @@ var file_filer_proto_depIdxs = []int32{
 	7,  // 15: filer_pb.StreamRenameEntryResponse.event_notification:type_name -> filer_pb.EventNotification
 	28, // 16: filer_pb.AssignVolumeResponse.location:type_name -> filer_pb.Location
 	28, // 17: filer_pb.Locations.locations:type_name -> filer_pb.Location
-	54, // 18: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
+	56, // 18: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
 	30, // 19: filer_pb.CollectionListResponse.collections:type_name -> filer_pb.Collection
 	7,  // 20: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
-	55, // 21: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
-	56, // 22: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
+	57, // 21: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
+	58, // 22: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
 	5,  // 23: filer_pb.CacheRemoteObjectToLocalClusterResponse.entry:type_name -> filer_pb.Entry
 	27, // 24: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
 	0,  // 25: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
@@ -4369,37 +4505,39 @@ var file_filer_proto_depIdxs = []int32{
 	31, // 35: filer_pb.SeaweedFiler.CollectionList:input_type -> filer_pb.CollectionListRequest
 	33, // 36: filer_pb.SeaweedFiler.DeleteCollection:input_type -> filer_pb.DeleteCollectionRequest
 	35, // 37: filer_pb.SeaweedFiler.Statistics:input_type -> filer_pb.StatisticsRequest
-	37, // 38: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
-	39, // 39: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	39, // 40: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	42, // 41: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
-	44, // 42: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
-	46, // 43: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
-	48, // 44: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
-	51, // 45: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:input_type -> filer_pb.CacheRemoteObjectToLocalClusterRequest
-	1,  // 46: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
-	3,  // 47: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
-	13, // 48: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
-	15, // 49: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
-	17, // 50: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
-	19, // 51: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
-	21, // 52: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
-	23, // 53: filer_pb.SeaweedFiler.StreamRenameEntry:output_type -> filer_pb.StreamRenameEntryResponse
-	25, // 54: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
-	29, // 55: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
-	32, // 56: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
-	34, // 57: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
-	36, // 58: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
-	38, // 59: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
-	40, // 60: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	40, // 61: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	43, // 62: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
-	45, // 63: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
-	47, // 64: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
-	49, // 65: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
-	52, // 66: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:output_type -> filer_pb.CacheRemoteObjectToLocalClusterResponse
-	46, // [46:67] is the sub-list for method output_type
-	25, // [25:46] is the sub-list for method input_type
+	37, // 38: filer_pb.SeaweedFiler.Ping:input_type -> filer_pb.PingRequest
+	39, // 39: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
+	41, // 40: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	41, // 41: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	44, // 42: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
+	46, // 43: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
+	48, // 44: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
+	50, // 45: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
+	53, // 46: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:input_type -> filer_pb.CacheRemoteObjectToLocalClusterRequest
+	1,  // 47: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
+	3,  // 48: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
+	13, // 49: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
+	15, // 50: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
+	17, // 51: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
+	19, // 52: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
+	21, // 53: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
+	23, // 54: filer_pb.SeaweedFiler.StreamRenameEntry:output_type -> filer_pb.StreamRenameEntryResponse
+	25, // 55: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
+	29, // 56: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
+	32, // 57: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
+	34, // 58: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
+	36, // 59: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
+	38, // 60: filer_pb.SeaweedFiler.Ping:output_type -> filer_pb.PingResponse
+	40, // 61: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
+	42, // 62: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	42, // 63: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	45, // 64: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
+	47, // 65: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
+	49, // 66: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
+	51, // 67: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
+	54, // 68: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:output_type -> filer_pb.CacheRemoteObjectToLocalClusterResponse
+	47, // [47:69] is the sub-list for method output_type
+	25, // [25:47] is the sub-list for method input_type
 	25, // [25:25] is the sub-list for extension type_name
 	25, // [25:25] is the sub-list for extension extendee
 	0,  // [0:25] is the sub-list for field type_name
@@ -4856,7 +4994,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFilerConfigurationRequest); i {
+			switch v := v.(*PingRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4868,7 +5006,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFilerConfigurationResponse); i {
+			switch v := v.(*PingResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4880,7 +5018,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeMetadataRequest); i {
+			switch v := v.(*GetFilerConfigurationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4892,7 +5030,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeMetadataResponse); i {
+			switch v := v.(*GetFilerConfigurationResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4904,7 +5042,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LogEntry); i {
+			switch v := v.(*SubscribeMetadataRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4916,7 +5054,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KeepConnectedRequest); i {
+			switch v := v.(*SubscribeMetadataResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4928,7 +5066,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KeepConnectedResponse); i {
+			switch v := v.(*LogEntry); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4940,7 +5078,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LocateBrokerRequest); i {
+			switch v := v.(*KeepConnectedRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4952,7 +5090,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LocateBrokerResponse); i {
+			switch v := v.(*KeepConnectedResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4964,7 +5102,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvGetRequest); i {
+			switch v := v.(*LocateBrokerRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4976,7 +5114,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvGetResponse); i {
+			switch v := v.(*LocateBrokerResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4988,7 +5126,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvPutRequest); i {
+			switch v := v.(*KvGetRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5000,7 +5138,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvPutResponse); i {
+			switch v := v.(*KvGetResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5012,7 +5150,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FilerConf); i {
+			switch v := v.(*KvPutRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5024,7 +5162,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CacheRemoteObjectToLocalClusterRequest); i {
+			switch v := v.(*KvPutResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5036,6 +5174,30 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FilerConf); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CacheRemoteObjectToLocalClusterRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CacheRemoteObjectToLocalClusterResponse); i {
 			case 0:
 				return &v.state
@@ -5047,7 +5209,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[55].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[57].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LocateBrokerResponse_Resource); i {
 			case 0:
 				return &v.state
@@ -5059,7 +5221,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[56].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[58].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FilerConf_PathConf); i {
 			case 0:
 				return &v.state
@@ -5078,7 +5240,7 @@ func file_filer_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_filer_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   57,
+			NumMessages:   59,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/filer_pb/filer_grpc.pb.go b/weed/pb/filer_pb/filer_grpc.pb.go
index 02302d317..e5699fba7 100644
--- a/weed/pb/filer_pb/filer_grpc.pb.go
+++ b/weed/pb/filer_pb/filer_grpc.pb.go
@@ -11,7 +11,6 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // SeaweedFilerClient is the client API for SeaweedFiler service.
@@ -31,6 +30,7 @@ type SeaweedFilerClient interface {
 	CollectionList(ctx context.Context, in *CollectionListRequest, opts ...grpc.CallOption) (*CollectionListResponse, error)
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
 	Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 	GetFilerConfiguration(ctx context.Context, in *GetFilerConfigurationRequest, opts ...grpc.CallOption) (*GetFilerConfigurationResponse, error)
 	SubscribeMetadata(ctx context.Context, in *SubscribeMetadataRequest, opts ...grpc.CallOption) (SeaweedFiler_SubscribeMetadataClient, error)
 	SubscribeLocalMetadata(ctx context.Context, in *SubscribeMetadataRequest, opts ...grpc.CallOption) (SeaweedFiler_SubscribeLocalMetadataClient, error)
@@ -212,6 +212,15 @@ func (c *seaweedFilerClient) Statistics(ctx context.Context, in *StatisticsReque
 	return out, nil
 }
 
+func (c *seaweedFilerClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *seaweedFilerClient) GetFilerConfiguration(ctx context.Context, in *GetFilerConfigurationRequest, opts ...grpc.CallOption) (*GetFilerConfigurationResponse, error) {
 	out := new(GetFilerConfigurationResponse)
 	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/GetFilerConfiguration", in, out, opts...)
@@ -369,6 +378,7 @@ type SeaweedFilerServer interface {
 	CollectionList(context.Context, *CollectionListRequest) (*CollectionListResponse, error)
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
 	Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	GetFilerConfiguration(context.Context, *GetFilerConfigurationRequest) (*GetFilerConfigurationResponse, error)
 	SubscribeMetadata(*SubscribeMetadataRequest, SeaweedFiler_SubscribeMetadataServer) error
 	SubscribeLocalMetadata(*SubscribeMetadataRequest, SeaweedFiler_SubscribeLocalMetadataServer) error
@@ -423,6 +433,9 @@ func (UnimplementedSeaweedFilerServer) DeleteCollection(context.Context, *Delete
 func (UnimplementedSeaweedFilerServer) Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Statistics not implemented")
 }
+func (UnimplementedSeaweedFilerServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedSeaweedFilerServer) GetFilerConfiguration(context.Context, *GetFilerConfigurationRequest) (*GetFilerConfigurationResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetFilerConfiguration not implemented")
 }
@@ -700,6 +713,24 @@ func _SeaweedFiler_Statistics_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _SeaweedFiler_GetFilerConfiguration_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(GetFilerConfigurationRequest)
 	if err := dec(in); err != nil {
@@ -910,6 +941,10 @@ var SeaweedFiler_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_Statistics_Handler,
 		},
 		{
+			MethodName: "Ping",
+			Handler:    _SeaweedFiler_Ping_Handler,
+		},
+		{
 			MethodName: "GetFilerConfiguration",
 			Handler:    _SeaweedFiler_GetFilerConfiguration_Handler,
 		},
diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go
index cedcc2813..d89e61433 100644
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"math/rand"
 	"net/http"
@@ -206,7 +207,15 @@ func WithMasterClient(streamingMode bool, master ServerAddress, grpcDialOption g
 
 }
 
-func WithOneOfGrpcMasterClients(streamingMode bool, masterGrpcAddresses []ServerAddress, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) (err error) {
+func WithVolumeServerClient(streamingMode bool, volumeServer ServerAddress, grpcDialOption grpc.DialOption, fn func(client volume_server_pb.VolumeServerClient) error) error {
+	return WithGrpcClient(streamingMode, func(grpcConnection *grpc.ClientConn) error {
+		client := volume_server_pb.NewVolumeServerClient(grpcConnection)
+		return fn(client)
+	}, volumeServer.ToGrpcAddress(), grpcDialOption)
+
+}
+
+func WithOneOfGrpcMasterClients(streamingMode bool, masterGrpcAddresses map[string]ServerAddress, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) (err error) {
 
 	for _, masterGrpcAddress := range masterGrpcAddresses {
 		err = WithGrpcClient(streamingMode, func(grpcConnection *grpc.ClientConn) error {
diff --git a/weed/pb/iam_pb/iam.pb.go b/weed/pb/iam_pb/iam.pb.go
index 89a4f1584..71a341b10 100644
--- a/weed/pb/iam_pb/iam.pb.go
+++ b/weed/pb/iam_pb/iam.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.3
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: iam.proto
 
 package iam_pb
diff --git a/weed/pb/iam_pb/iam_grpc.pb.go b/weed/pb/iam_pb/iam_grpc.pb.go
index b9438a295..3688cf423 100644
--- a/weed/pb/iam_pb/iam_grpc.pb.go
+++ b/weed/pb/iam_pb/iam_grpc.pb.go
@@ -8,7 +8,6 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // SeaweedIdentityAccessManagementClient is the client API for SeaweedIdentityAccessManagement service.
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 7a257bb28..ff8e94bd1 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -35,7 +35,14 @@ service Seaweed {
   }
   rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
   }
-
+  rpc Ping (PingRequest) returns (PingResponse) {
+  }
+  rpc RaftListClusterServers (RaftListClusterServersRequest) returns (RaftListClusterServersResponse) {
+  }
+  rpc RaftAddServer (RaftAddServerRequest) returns (RaftAddServerResponse) {
+  }
+  rpc RaftRemoveServer (RaftRemoveServerRequest) returns (RaftRemoveServerResponse) {
+  }
 }
 
 //////////////////////////////////////////////////
@@ -140,6 +147,8 @@ message VolumeLocation {
   string leader = 5; // optional when leader is not itself
   string data_center = 6; // optional when DataCenter is in use
   uint32 grpc_port = 7;
+  repeated uint32 new_ec_vids = 8;
+  repeated uint32 deleted_ec_vids = 9;
 }
 
 message ClusterNodeUpdate {
@@ -281,6 +290,8 @@ message LookupEcVolumeResponse {
 
 message VacuumVolumeRequest {
   float garbage_threshold = 1;
+  uint32 volume_id = 2;
+  string collection = 3;
 }
 message VacuumVolumeResponse {
 }
@@ -328,3 +339,39 @@ message ReleaseAdminTokenRequest {
 }
 message ReleaseAdminTokenResponse {
 }
+
+message PingRequest {
+  string target = 1; // default to ping itself
+  string target_type = 2;
+}
+message PingResponse {
+  int64 start_time_ns = 1;
+  int64 remote_time_ns = 2;
+  int64 stop_time_ns = 3;
+}
+
+message RaftAddServerRequest {
+  string id = 1;
+  string address = 2;
+  bool voter = 3;
+}
+message RaftAddServerResponse {
+}
+
+message RaftRemoveServerRequest {
+  string id = 1;
+  bool force = 2;
+}
+message RaftRemoveServerResponse {
+}
+
+message RaftListClusterServersRequest {
+}
+message RaftListClusterServersResponse {
+  message ClusterServers {
+    string id = 1;
+    string address = 2;
+    string suffrage = 3; //
+  }
+  repeated ClusterServers cluster_servers = 1;
+}
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 681534fc3..ab86f48e6 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.3
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: master.proto
 
 package master_pb
@@ -810,13 +810,15 @@ type VolumeLocation struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Url         string   `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
-	PublicUrl   string   `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
-	NewVids     []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids,proto3" json:"new_vids,omitempty"`
-	DeletedVids []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids,proto3" json:"deleted_vids,omitempty"`
-	Leader      string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`                           // optional when leader is not itself
-	DataCenter  string   `protobuf:"bytes,6,opt,name=data_center,json=dataCenter,proto3" json:"data_center,omitempty"` // optional when DataCenter is in use
-	GrpcPort    uint32   `protobuf:"varint,7,opt,name=grpc_port,json=grpcPort,proto3" json:"grpc_port,omitempty"`
+	Url           string   `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
+	PublicUrl     string   `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
+	NewVids       []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids,proto3" json:"new_vids,omitempty"`
+	DeletedVids   []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids,proto3" json:"deleted_vids,omitempty"`
+	Leader        string   `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`                           // optional when leader is not itself
+	DataCenter    string   `protobuf:"bytes,6,opt,name=data_center,json=dataCenter,proto3" json:"data_center,omitempty"` // optional when DataCenter is in use
+	GrpcPort      uint32   `protobuf:"varint,7,opt,name=grpc_port,json=grpcPort,proto3" json:"grpc_port,omitempty"`
+	NewEcVids     []uint32 `protobuf:"varint,8,rep,packed,name=new_ec_vids,json=newEcVids,proto3" json:"new_ec_vids,omitempty"`
+	DeletedEcVids []uint32 `protobuf:"varint,9,rep,packed,name=deleted_ec_vids,json=deletedEcVids,proto3" json:"deleted_ec_vids,omitempty"`
 }
 
 func (x *VolumeLocation) Reset() {
@@ -900,6 +902,20 @@ func (x *VolumeLocation) GetGrpcPort() uint32 {
 	return 0
 }
 
+func (x *VolumeLocation) GetNewEcVids() []uint32 {
+	if x != nil {
+		return x.NewEcVids
+	}
+	return nil
+}
+
+func (x *VolumeLocation) GetDeletedEcVids() []uint32 {
+	if x != nil {
+		return x.DeletedEcVids
+	}
+	return nil
+}
+
 type ClusterNodeUpdate struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2327,6 +2343,8 @@ type VacuumVolumeRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	GarbageThreshold float32 `protobuf:"fixed32,1,opt,name=garbage_threshold,json=garbageThreshold,proto3" json:"garbage_threshold,omitempty"`
+	VolumeId         uint32  `protobuf:"varint,2,opt,name=volume_id,json=volumeId,proto3" json:"volume_id,omitempty"`
+	Collection       string  `protobuf:"bytes,3,opt,name=collection,proto3" json:"collection,omitempty"`
 }
 
 func (x *VacuumVolumeRequest) Reset() {
@@ -2368,6 +2386,20 @@ func (x *VacuumVolumeRequest) GetGarbageThreshold() float32 {
 	return 0
 }
 
+func (x *VacuumVolumeRequest) GetVolumeId() uint32 {
+	if x != nil {
+		return x.VolumeId
+	}
+	return 0
+}
+
+func (x *VacuumVolumeRequest) GetCollection() string {
+	if x != nil {
+		return x.Collection
+	}
+	return ""
+}
+
 type VacuumVolumeResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2868,6 +2900,403 @@ func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) {
 	return file_master_proto_rawDescGZIP(), []int{42}
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[43]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[43]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{43}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	StartTimeNs  int64 `protobuf:"varint,1,opt,name=start_time_ns,json=startTimeNs,proto3" json:"start_time_ns,omitempty"`
+	RemoteTimeNs int64 `protobuf:"varint,2,opt,name=remote_time_ns,json=remoteTimeNs,proto3" json:"remote_time_ns,omitempty"`
+	StopTimeNs   int64 `protobuf:"varint,3,opt,name=stop_time_ns,json=stopTimeNs,proto3" json:"stop_time_ns,omitempty"`
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[44]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[44]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{44}
+}
+
+func (x *PingResponse) GetStartTimeNs() int64 {
+	if x != nil {
+		return x.StartTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetRemoteTimeNs() int64 {
+	if x != nil {
+		return x.RemoteTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetStopTimeNs() int64 {
+	if x != nil {
+		return x.StopTimeNs
+	}
+	return 0
+}
+
+type RaftAddServerRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id      string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Address string `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
+	Voter   bool   `protobuf:"varint,3,opt,name=voter,proto3" json:"voter,omitempty"`
+}
+
+func (x *RaftAddServerRequest) Reset() {
+	*x = RaftAddServerRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[45]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftAddServerRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftAddServerRequest) ProtoMessage() {}
+
+func (x *RaftAddServerRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[45]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftAddServerRequest.ProtoReflect.Descriptor instead.
+func (*RaftAddServerRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{45}
+}
+
+func (x *RaftAddServerRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *RaftAddServerRequest) GetAddress() string {
+	if x != nil {
+		return x.Address
+	}
+	return ""
+}
+
+func (x *RaftAddServerRequest) GetVoter() bool {
+	if x != nil {
+		return x.Voter
+	}
+	return false
+}
+
+type RaftAddServerResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *RaftAddServerResponse) Reset() {
+	*x = RaftAddServerResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[46]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftAddServerResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftAddServerResponse) ProtoMessage() {}
+
+func (x *RaftAddServerResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[46]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftAddServerResponse.ProtoReflect.Descriptor instead.
+func (*RaftAddServerResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{46}
+}
+
+type RaftRemoveServerRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id    string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Force bool   `protobuf:"varint,2,opt,name=force,proto3" json:"force,omitempty"`
+}
+
+func (x *RaftRemoveServerRequest) Reset() {
+	*x = RaftRemoveServerRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[47]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftRemoveServerRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftRemoveServerRequest) ProtoMessage() {}
+
+func (x *RaftRemoveServerRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[47]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftRemoveServerRequest.ProtoReflect.Descriptor instead.
+func (*RaftRemoveServerRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{47}
+}
+
+func (x *RaftRemoveServerRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *RaftRemoveServerRequest) GetForce() bool {
+	if x != nil {
+		return x.Force
+	}
+	return false
+}
+
+type RaftRemoveServerResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *RaftRemoveServerResponse) Reset() {
+	*x = RaftRemoveServerResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[48]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftRemoveServerResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftRemoveServerResponse) ProtoMessage() {}
+
+func (x *RaftRemoveServerResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[48]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftRemoveServerResponse.ProtoReflect.Descriptor instead.
+func (*RaftRemoveServerResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{48}
+}
+
+type RaftListClusterServersRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *RaftListClusterServersRequest) Reset() {
+	*x = RaftListClusterServersRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[49]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftListClusterServersRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftListClusterServersRequest) ProtoMessage() {}
+
+func (x *RaftListClusterServersRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[49]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftListClusterServersRequest.ProtoReflect.Descriptor instead.
+func (*RaftListClusterServersRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{49}
+}
+
+type RaftListClusterServersResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ClusterServers []*RaftListClusterServersResponse_ClusterServers `protobuf:"bytes,1,rep,name=cluster_servers,json=clusterServers,proto3" json:"cluster_servers,omitempty"`
+}
+
+func (x *RaftListClusterServersResponse) Reset() {
+	*x = RaftListClusterServersResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[50]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftListClusterServersResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftListClusterServersResponse) ProtoMessage() {}
+
+func (x *RaftListClusterServersResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[50]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftListClusterServersResponse.ProtoReflect.Descriptor instead.
+func (*RaftListClusterServersResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{50}
+}
+
+func (x *RaftListClusterServersResponse) GetClusterServers() []*RaftListClusterServersResponse_ClusterServers {
+	if x != nil {
+		return x.ClusterServers
+	}
+	return nil
+}
+
 type SuperBlockExtra_ErasureCoding struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2881,7 +3310,7 @@ type SuperBlockExtra_ErasureCoding struct {
 func (x *SuperBlockExtra_ErasureCoding) Reset() {
 	*x = SuperBlockExtra_ErasureCoding{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[45]
+		mi := &file_master_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2894,7 +3323,7 @@ func (x *SuperBlockExtra_ErasureCoding) String() string {
 func (*SuperBlockExtra_ErasureCoding) ProtoMessage() {}
 
 func (x *SuperBlockExtra_ErasureCoding) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[45]
+	mi := &file_master_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2945,7 +3374,7 @@ type LookupVolumeResponse_VolumeIdLocation struct {
 func (x *LookupVolumeResponse_VolumeIdLocation) Reset() {
 	*x = LookupVolumeResponse_VolumeIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[46]
+		mi := &file_master_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2958,7 +3387,7 @@ func (x *LookupVolumeResponse_VolumeIdLocation) String() string {
 func (*LookupVolumeResponse_VolumeIdLocation) ProtoMessage() {}
 
 func (x *LookupVolumeResponse_VolumeIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[46]
+	mi := &file_master_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3014,7 +3443,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[51]
+		mi := &file_master_proto_msgTypes[59]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3027,7 +3456,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[51]
+	mi := &file_master_proto_msgTypes[59]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3070,7 +3499,7 @@ type ListClusterNodesResponse_ClusterNode struct {
 func (x *ListClusterNodesResponse_ClusterNode) Reset() {
 	*x = ListClusterNodesResponse_ClusterNode{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[52]
+		mi := &file_master_proto_msgTypes[60]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3083,7 +3512,7 @@ func (x *ListClusterNodesResponse_ClusterNode) String() string {
 func (*ListClusterNodesResponse_ClusterNode) ProtoMessage() {}
 
 func (x *ListClusterNodesResponse_ClusterNode) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[52]
+	mi := &file_master_proto_msgTypes[60]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3120,6 +3549,69 @@ func (x *ListClusterNodesResponse_ClusterNode) GetIsLeader() bool {
 	return false
 }
 
+type RaftListClusterServersResponse_ClusterServers struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id       string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Address  string `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
+	Suffrage string `protobuf:"bytes,3,opt,name=suffrage,proto3" json:"suffrage,omitempty"` //
+}
+
+func (x *RaftListClusterServersResponse_ClusterServers) Reset() {
+	*x = RaftListClusterServersResponse_ClusterServers{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[61]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RaftListClusterServersResponse_ClusterServers) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RaftListClusterServersResponse_ClusterServers) ProtoMessage() {}
+
+func (x *RaftListClusterServersResponse_ClusterServers) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[61]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RaftListClusterServersResponse_ClusterServers.ProtoReflect.Descriptor instead.
+func (*RaftListClusterServersResponse_ClusterServers) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{50, 0}
+}
+
+func (x *RaftListClusterServersResponse_ClusterServers) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *RaftListClusterServersResponse_ClusterServers) GetAddress() string {
+	if x != nil {
+		return x.Address
+	}
+	return ""
+}
+
+func (x *RaftListClusterServersResponse_ClusterServers) GetSuffrage() string {
+	if x != nil {
+		return x.Suffrage
+	}
+	return ""
+}
+
 var File_master_proto protoreflect.FileDescriptor
 
 var file_master_proto_rawDesc = []byte{
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 }
 
 var (
@@ -3702,7 +4266,7 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 53)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 62)
 var file_master_proto_goTypes = []interface{}{
 	(*Heartbeat)(nil),                             // 0: master_pb.Heartbeat
 	(*HeartbeatResponse)(nil),                     // 1: master_pb.HeartbeatResponse
@@ -3747,16 +4311,25 @@ var file_master_proto_goTypes = []interface{}{
 	(*LeaseAdminTokenResponse)(nil),               // 40: master_pb.LeaseAdminTokenResponse
 	(*ReleaseAdminTokenRequest)(nil),              // 41: master_pb.ReleaseAdminTokenRequest
 	(*ReleaseAdminTokenResponse)(nil),             // 42: master_pb.ReleaseAdminTokenResponse
-	nil,                                           // 43: master_pb.Heartbeat.MaxVolumeCountsEntry
-	nil,                                           // 44: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),         // 45: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 46: master_pb.LookupVolumeResponse.VolumeIdLocation
-	nil, // 47: master_pb.DataNodeInfo.DiskInfosEntry
-	nil, // 48: master_pb.RackInfo.DiskInfosEntry
-	nil, // 49: master_pb.DataCenterInfo.DiskInfosEntry
-	nil, // 50: master_pb.TopologyInfo.DiskInfosEntry
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 51: master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	(*ListClusterNodesResponse_ClusterNode)(nil),     // 52: master_pb.ListClusterNodesResponse.ClusterNode
+	(*PingRequest)(nil),                           // 43: master_pb.PingRequest
+	(*PingResponse)(nil),                          // 44: master_pb.PingResponse
+	(*RaftAddServerRequest)(nil),                  // 45: master_pb.RaftAddServerRequest
+	(*RaftAddServerResponse)(nil),                 // 46: master_pb.RaftAddServerResponse
+	(*RaftRemoveServerRequest)(nil),               // 47: master_pb.RaftRemoveServerRequest
+	(*RaftRemoveServerResponse)(nil),              // 48: master_pb.RaftRemoveServerResponse
+	(*RaftListClusterServersRequest)(nil),         // 49: master_pb.RaftListClusterServersRequest
+	(*RaftListClusterServersResponse)(nil),        // 50: master_pb.RaftListClusterServersResponse
+	nil,                                           // 51: master_pb.Heartbeat.MaxVolumeCountsEntry
+	nil,                                           // 52: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),         // 53: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 54: master_pb.LookupVolumeResponse.VolumeIdLocation
+	nil, // 55: master_pb.DataNodeInfo.DiskInfosEntry
+	nil, // 56: master_pb.RackInfo.DiskInfosEntry
+	nil, // 57: master_pb.DataCenterInfo.DiskInfosEntry
+	nil, // 58: master_pb.TopologyInfo.DiskInfosEntry
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil),      // 59: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*ListClusterNodesResponse_ClusterNode)(nil),          // 60: master_pb.ListClusterNodesResponse.ClusterNode
+	(*RaftListClusterServersResponse_ClusterServers)(nil), // 61: master_pb.RaftListClusterServersResponse.ClusterServers
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3765,68 +4338,77 @@ var file_master_proto_depIdxs = []int32{
 	4,  // 3: master_pb.Heartbeat.ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 4: master_pb.Heartbeat.new_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 5: master_pb.Heartbeat.deleted_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
-	43, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
+	51, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
 	5,  // 7: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
-	44, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
-	45, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
+	52, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
+	53, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
 	9,  // 10: master_pb.KeepConnectedResponse.volume_location:type_name -> master_pb.VolumeLocation
 	10, // 11: master_pb.KeepConnectedResponse.cluster_node_update:type_name -> master_pb.ClusterNodeUpdate
-	46, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
+	54, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
 	14, // 13: master_pb.AssignResponse.replicas:type_name -> master_pb.Location
 	14, // 14: master_pb.AssignResponse.location:type_name -> master_pb.Location
 	19, // 15: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
 	2,  // 16: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
 	4,  // 17: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
-	47, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
+	55, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
 	25, // 19: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
-	48, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
+	56, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
 	26, // 21: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
-	49, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
+	57, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
 	27, // 23: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
-	50, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
+	58, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
 	28, // 25: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	51, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	59, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
 	5,  // 27: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
-	52, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
-	14, // 29: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
-	24, // 30: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	24, // 31: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	24, // 32: master_pb.DataCenterInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	24, // 33: master_pb.TopologyInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	14, // 34: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
-	0,  // 35: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
-	8,  // 36: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
-	12, // 37: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
-	15, // 38: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
-	17, // 39: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
-	20, // 40: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
-	22, // 41: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
-	29, // 42: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
-	31, // 43: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
-	33, // 44: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
-	35, // 45: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
-	37, // 46: master_pb.Seaweed.ListClusterNodes:input_type -> master_pb.ListClusterNodesRequest
-	39, // 47: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
-	41, // 48: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 49: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	11, // 50: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
-	13, // 51: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	16, // 52: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	18, // 53: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	21, // 54: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	23, // 55: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	30, // 56: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	32, // 57: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	34, // 58: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
-	36, // 59: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	38, // 60: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
-	40, // 61: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	42, // 62: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	49, // [49:63] is the sub-list for method output_type
-	35, // [35:49] is the sub-list for method input_type
-	35, // [35:35] is the sub-list for extension type_name
-	35, // [35:35] is the sub-list for extension extendee
-	0,  // [0:35] is the sub-list for field type_name
+	60, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
+	61, // 29: master_pb.RaftListClusterServersResponse.cluster_servers:type_name -> master_pb.RaftListClusterServersResponse.ClusterServers
+	14, // 30: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
+	24, // 31: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	24, // 32: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	24, // 33: master_pb.DataCenterInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	24, // 34: master_pb.TopologyInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	14, // 35: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
+	0,  // 36: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
+	8,  // 37: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
+	12, // 38: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
+	15, // 39: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
+	17, // 40: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
+	20, // 41: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
+	22, // 42: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
+	29, // 43: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
+	31, // 44: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
+	33, // 45: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
+	35, // 46: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
+	37, // 47: master_pb.Seaweed.ListClusterNodes:input_type -> master_pb.ListClusterNodesRequest
+	39, // 48: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
+	41, // 49: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
+	43, // 50: master_pb.Seaweed.Ping:input_type -> master_pb.PingRequest
+	49, // 51: master_pb.Seaweed.RaftListClusterServers:input_type -> master_pb.RaftListClusterServersRequest
+	45, // 52: master_pb.Seaweed.RaftAddServer:input_type -> master_pb.RaftAddServerRequest
+	47, // 53: master_pb.Seaweed.RaftRemoveServer:input_type -> master_pb.RaftRemoveServerRequest
+	1,  // 54: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	11, // 55: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
+	13, // 56: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	16, // 57: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	18, // 58: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	21, // 59: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	23, // 60: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	30, // 61: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	32, // 62: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	34, // 63: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	36, // 64: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	38, // 65: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
+	40, // 66: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	42, // 67: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	44, // 68: master_pb.Seaweed.Ping:output_type -> master_pb.PingResponse
+	50, // 69: master_pb.Seaweed.RaftListClusterServers:output_type -> master_pb.RaftListClusterServersResponse
+	46, // 70: master_pb.Seaweed.RaftAddServer:output_type -> master_pb.RaftAddServerResponse
+	48, // 71: master_pb.Seaweed.RaftRemoveServer:output_type -> master_pb.RaftRemoveServerResponse
+	54, // [54:72] is the sub-list for method output_type
+	36, // [36:54] is the sub-list for method input_type
+	36, // [36:36] is the sub-list for extension type_name
+	36, // [36:36] is the sub-list for extension extendee
+	0,  // [0:36] is the sub-list for field type_name
 }
 
 func init() { file_master_proto_init() }
@@ -4351,8 +4933,32 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
+		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 		file_master_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
+			switch v := v.(*RaftAddServerRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4364,6 +4970,78 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftAddServerResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftRemoveServerRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftRemoveServerResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftListClusterServersRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftListClusterServersResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupVolumeResponse_VolumeIdLocation); i {
 			case 0:
 				return &v.state
@@ -4375,7 +5053,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[59].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -4387,7 +5065,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[60].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListClusterNodesResponse_ClusterNode); i {
 			case 0:
 				return &v.state
@@ -4399,6 +5077,18 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
+		file_master_proto_msgTypes[61].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RaftListClusterServersResponse_ClusterServers); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -4406,7 +5096,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   53,
+			NumMessages:   62,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/master_pb/master_grpc.pb.go b/weed/pb/master_pb/master_grpc.pb.go
index 7046afec6..ac6ff545d 100644
--- a/weed/pb/master_pb/master_grpc.pb.go
+++ b/weed/pb/master_pb/master_grpc.pb.go
@@ -11,7 +11,6 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // SeaweedClient is the client API for Seaweed service.
@@ -32,6 +31,10 @@ type SeaweedClient interface {
 	ListClusterNodes(ctx context.Context, in *ListClusterNodesRequest, opts ...grpc.CallOption) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(ctx context.Context, in *ReleaseAdminTokenRequest, opts ...grpc.CallOption) (*ReleaseAdminTokenResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
+	RaftListClusterServers(ctx context.Context, in *RaftListClusterServersRequest, opts ...grpc.CallOption) (*RaftListClusterServersResponse, error)
+	RaftAddServer(ctx context.Context, in *RaftAddServerRequest, opts ...grpc.CallOption) (*RaftAddServerResponse, error)
+	RaftRemoveServer(ctx context.Context, in *RaftRemoveServerRequest, opts ...grpc.CallOption) (*RaftRemoveServerResponse, error)
 }
 
 type seaweedClient struct {
@@ -212,6 +215,42 @@ func (c *seaweedClient) ReleaseAdminToken(ctx context.Context, in *ReleaseAdminT
 	return out, nil
 }
 
+func (c *seaweedClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedClient) RaftListClusterServers(ctx context.Context, in *RaftListClusterServersRequest, opts ...grpc.CallOption) (*RaftListClusterServersResponse, error) {
+	out := new(RaftListClusterServersResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/RaftListClusterServers", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedClient) RaftAddServer(ctx context.Context, in *RaftAddServerRequest, opts ...grpc.CallOption) (*RaftAddServerResponse, error) {
+	out := new(RaftAddServerResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/RaftAddServer", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedClient) RaftRemoveServer(ctx context.Context, in *RaftRemoveServerRequest, opts ...grpc.CallOption) (*RaftRemoveServerResponse, error) {
+	out := new(RaftRemoveServerResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/RaftRemoveServer", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SeaweedServer is the server API for Seaweed service.
 // All implementations must embed UnimplementedSeaweedServer
 // for forward compatibility
@@ -230,6 +269,10 @@ type SeaweedServer interface {
 	ListClusterNodes(context.Context, *ListClusterNodesRequest) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(context.Context, *LeaseAdminTokenRequest) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
+	RaftListClusterServers(context.Context, *RaftListClusterServersRequest) (*RaftListClusterServersResponse, error)
+	RaftAddServer(context.Context, *RaftAddServerRequest) (*RaftAddServerResponse, error)
+	RaftRemoveServer(context.Context, *RaftRemoveServerRequest) (*RaftRemoveServerResponse, error)
 	mustEmbedUnimplementedSeaweedServer()
 }
 
@@ -279,6 +322,18 @@ func (UnimplementedSeaweedServer) LeaseAdminToken(context.Context, *LeaseAdminTo
 func (UnimplementedSeaweedServer) ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ReleaseAdminToken not implemented")
 }
+func (UnimplementedSeaweedServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
+func (UnimplementedSeaweedServer) RaftListClusterServers(context.Context, *RaftListClusterServersRequest) (*RaftListClusterServersResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RaftListClusterServers not implemented")
+}
+func (UnimplementedSeaweedServer) RaftAddServer(context.Context, *RaftAddServerRequest) (*RaftAddServerResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RaftAddServer not implemented")
+}
+func (UnimplementedSeaweedServer) RaftRemoveServer(context.Context, *RaftRemoveServerRequest) (*RaftRemoveServerResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RaftRemoveServer not implemented")
+}
 func (UnimplementedSeaweedServer) mustEmbedUnimplementedSeaweedServer() {}
 
 // UnsafeSeaweedServer may be embedded to opt out of forward compatibility for this service.
@@ -560,6 +615,78 @@ func _Seaweed_ReleaseAdminToken_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Seaweed_RaftListClusterServers_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RaftListClusterServersRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).RaftListClusterServers(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/RaftListClusterServers",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).RaftListClusterServers(ctx, req.(*RaftListClusterServersRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Seaweed_RaftAddServer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RaftAddServerRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).RaftAddServer(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/RaftAddServer",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).RaftAddServer(ctx, req.(*RaftAddServerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Seaweed_RaftRemoveServer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RaftRemoveServerRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).RaftRemoveServer(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/RaftRemoveServer",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).RaftRemoveServer(ctx, req.(*RaftRemoveServerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // Seaweed_ServiceDesc is the grpc.ServiceDesc for Seaweed service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -615,6 +742,22 @@ var Seaweed_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "ReleaseAdminToken",
 			Handler:    _Seaweed_ReleaseAdminToken_Handler,
 		},
+		{
+			MethodName: "Ping",
+			Handler:    _Seaweed_Ping_Handler,
+		},
+		{
+			MethodName: "RaftListClusterServers",
+			Handler:    _Seaweed_RaftListClusterServers_Handler,
+		},
+		{
+			MethodName: "RaftAddServer",
+			Handler:    _Seaweed_RaftAddServer_Handler,
+		},
+		{
+			MethodName: "RaftRemoveServer",
+			Handler:    _Seaweed_RaftRemoveServer_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/weed/pb/messaging_pb/messaging.pb.go b/weed/pb/messaging_pb/messaging.pb.go
index 5b9ca1ee3..75a91a8ff 100644
--- a/weed/pb/messaging_pb/messaging.pb.go
+++ b/weed/pb/messaging_pb/messaging.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.3
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: messaging.proto
 
 package messaging_pb
diff --git a/weed/pb/messaging_pb/messaging_grpc.pb.go b/weed/pb/messaging_pb/messaging_grpc.pb.go
index 234cffa95..681dd3053 100644
--- a/weed/pb/messaging_pb/messaging_grpc.pb.go
+++ b/weed/pb/messaging_pb/messaging_grpc.pb.go
@@ -11,7 +11,6 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // SeaweedMessagingClient is the client API for SeaweedMessaging service.
diff --git a/weed/pb/mount.proto b/weed/pb/mount.proto
new file mode 100644
index 000000000..ec0847f12
--- /dev/null
+++ b/weed/pb/mount.proto
@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package messaging_pb;
+
+option go_package = "github.com/chrislusf/seaweedfs/weed/pb/mount_pb";
+option java_package = "seaweedfs.client";
+option java_outer_classname = "MountProto";
+
+//////////////////////////////////////////////////
+
+service SeaweedMount {
+
+    rpc Configure (ConfigureRequest) returns (ConfigureResponse) {
+    }
+
+}
+
+//////////////////////////////////////////////////
+
+message ConfigureRequest {
+    int64 collection_capacity = 1;
+}
+
+message ConfigureResponse {
+}
diff --git a/weed/pb/mount_pb/mount.pb.go b/weed/pb/mount_pb/mount.pb.go
new file mode 100644
index 000000000..4cd3b5557
--- /dev/null
+++ b/weed/pb/mount_pb/mount.pb.go
@@ -0,0 +1,208 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
+// source: mount.proto
+
+package mount_pb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type ConfigureRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CollectionCapacity int64 `protobuf:"varint,1,opt,name=collection_capacity,json=collectionCapacity,proto3" json:"collection_capacity,omitempty"`
+}
+
+func (x *ConfigureRequest) Reset() {
+	*x = ConfigureRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mount_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ConfigureRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ConfigureRequest) ProtoMessage() {}
+
+func (x *ConfigureRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_mount_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ConfigureRequest.ProtoReflect.Descriptor instead.
+func (*ConfigureRequest) Descriptor() ([]byte, []int) {
+	return file_mount_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ConfigureRequest) GetCollectionCapacity() int64 {
+	if x != nil {
+		return x.CollectionCapacity
+	}
+	return 0
+}
+
+type ConfigureResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *ConfigureResponse) Reset() {
+	*x = ConfigureResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mount_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ConfigureResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ConfigureResponse) ProtoMessage() {}
+
+func (x *ConfigureResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mount_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ConfigureResponse.ProtoReflect.Descriptor instead.
+func (*ConfigureResponse) Descriptor() ([]byte, []int) {
+	return file_mount_proto_rawDescGZIP(), []int{1}
+}
+
+var File_mount_proto protoreflect.FileDescriptor
+
+var file_mount_proto_rawDesc = []byte{
+	0x0a, 0x0b, 0x6d, 0x6f, 0x75, 0x6e, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0c, 0x6d,
+	0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70, 0x62, 0x22, 0x43, 0x0a, 0x10, 0x43,
+	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12,
+	0x2f, 0x0a, 0x13, 0x63, 0x6f, 0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x63, 0x61,
+	0x70, 0x61, 0x63, 0x69, 0x74, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x03, 0x52, 0x12, 0x63, 0x6f,
+	0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x61, 0x70, 0x61, 0x63, 0x69, 0x74, 0x79,
+	0x22, 0x13, 0x0a, 0x11, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73,
+	0x70, 0x6f, 0x6e, 0x73, 0x65, 0x32, 0x5e, 0x0a, 0x0c, 0x53, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64,
+	0x4d, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x4e, 0x0a, 0x09, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75,
+	0x72, 0x65, 0x12, 0x1e, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70,
+	0x62, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65,
+	0x73, 0x74, 0x1a, 0x1f, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70,
+	0x62, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64,
+	0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x4d, 0x6f, 0x75, 0x6e, 0x74,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77,
+	0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x6f,
+	0x75, 0x6e, 0x74, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_mount_proto_rawDescOnce sync.Once
+	file_mount_proto_rawDescData = file_mount_proto_rawDesc
+)
+
+func file_mount_proto_rawDescGZIP() []byte {
+	file_mount_proto_rawDescOnce.Do(func() {
+		file_mount_proto_rawDescData = protoimpl.X.CompressGZIP(file_mount_proto_rawDescData)
+	})
+	return file_mount_proto_rawDescData
+}
+
+var file_mount_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_mount_proto_goTypes = []interface{}{
+	(*ConfigureRequest)(nil),  // 0: messaging_pb.ConfigureRequest
+	(*ConfigureResponse)(nil), // 1: messaging_pb.ConfigureResponse
+}
+var file_mount_proto_depIdxs = []int32{
+	0, // 0: messaging_pb.SeaweedMount.Configure:input_type -> messaging_pb.ConfigureRequest
+	1, // 1: messaging_pb.SeaweedMount.Configure:output_type -> messaging_pb.ConfigureResponse
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_mount_proto_init() }
+func file_mount_proto_init() {
+	if File_mount_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_mount_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ConfigureRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mount_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ConfigureResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_mount_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_mount_proto_goTypes,
+		DependencyIndexes: file_mount_proto_depIdxs,
+		MessageInfos:      file_mount_proto_msgTypes,
+	}.Build()
+	File_mount_proto = out.File
+	file_mount_proto_rawDesc = nil
+	file_mount_proto_goTypes = nil
+	file_mount_proto_depIdxs = nil
+}
diff --git a/weed/pb/mount_pb/mount_grpc.pb.go b/weed/pb/mount_pb/mount_grpc.pb.go
new file mode 100644
index 000000000..0dba35218
--- /dev/null
+++ b/weed/pb/mount_pb/mount_grpc.pb.go
@@ -0,0 +1,100 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+package mount_pb
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion7
+
+// SeaweedMountClient is the client API for SeaweedMount service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type SeaweedMountClient interface {
+	Configure(ctx context.Context, in *ConfigureRequest, opts ...grpc.CallOption) (*ConfigureResponse, error)
+}
+
+type seaweedMountClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewSeaweedMountClient(cc grpc.ClientConnInterface) SeaweedMountClient {
+	return &seaweedMountClient{cc}
+}
+
+func (c *seaweedMountClient) Configure(ctx context.Context, in *ConfigureRequest, opts ...grpc.CallOption) (*ConfigureResponse, error) {
+	out := new(ConfigureResponse)
+	err := c.cc.Invoke(ctx, "/messaging_pb.SeaweedMount/Configure", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// SeaweedMountServer is the server API for SeaweedMount service.
+// All implementations must embed UnimplementedSeaweedMountServer
+// for forward compatibility
+type SeaweedMountServer interface {
+	Configure(context.Context, *ConfigureRequest) (*ConfigureResponse, error)
+	mustEmbedUnimplementedSeaweedMountServer()
+}
+
+// UnimplementedSeaweedMountServer must be embedded to have forward compatible implementations.
+type UnimplementedSeaweedMountServer struct {
+}
+
+func (UnimplementedSeaweedMountServer) Configure(context.Context, *ConfigureRequest) (*ConfigureResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Configure not implemented")
+}
+func (UnimplementedSeaweedMountServer) mustEmbedUnimplementedSeaweedMountServer() {}
+
+// UnsafeSeaweedMountServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to SeaweedMountServer will
+// result in compilation errors.
+type UnsafeSeaweedMountServer interface {
+	mustEmbedUnimplementedSeaweedMountServer()
+}
+
+func RegisterSeaweedMountServer(s grpc.ServiceRegistrar, srv SeaweedMountServer) {
+	s.RegisterService(&SeaweedMount_ServiceDesc, srv)
+}
+
+func _SeaweedMount_Configure_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ConfigureRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedMountServer).Configure(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/messaging_pb.SeaweedMount/Configure",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedMountServer).Configure(ctx, req.(*ConfigureRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// SeaweedMount_ServiceDesc is the grpc.ServiceDesc for SeaweedMount service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var SeaweedMount_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "messaging_pb.SeaweedMount",
+	HandlerType: (*SeaweedMountServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Configure",
+			Handler:    _SeaweedMount_Configure_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "mount.proto",
+}
diff --git a/weed/pb/remote_pb/remote.pb.go b/weed/pb/remote_pb/remote.pb.go
index ba43bd3dd..61ac6c0cc 100644
--- a/weed/pb/remote_pb/remote.pb.go
+++ b/weed/pb/remote_pb/remote.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.6.1
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: remote.proto
 
 package remote_pb
diff --git a/weed/pb/server_address.go b/weed/pb/server_address.go
index b60551c71..a66d0d831 100644
--- a/weed/pb/server_address.go
+++ b/weed/pb/server_address.go
@@ -86,6 +86,14 @@ func (sa ServerAddresses) ToAddresses() (addresses []ServerAddress) {
 	return
 }
 
+func (sa ServerAddresses) ToAddressMap() (addresses map[string]ServerAddress) {
+	addresses = make(map[string]ServerAddress)
+	for _, address := range sa.ToAddresses() {
+		addresses[string(address)] = address
+	}
+	return
+}
+
 func (sa ServerAddresses) ToAddressStrings() (addresses []string) {
 	parts := strings.Split(string(sa), ",")
 	for _, address := range parts {
@@ -101,6 +109,13 @@ func ToAddressStrings(addresses []ServerAddress) []string {
 	}
 	return strings
 }
+func ToAddressStringsFromMap(addresses map[string]ServerAddress) []string {
+	var strings []string
+	for _, addr := range addresses {
+		strings = append(strings, string(addr))
+	}
+	return strings
+}
 func FromAddressStrings(strings []string) []ServerAddress {
 	var addresses []ServerAddress
 	for _, addr := range strings {
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index b7a3caade..541349b31 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -107,6 +107,10 @@ service VolumeServer {
 
     rpc VolumeNeedleStatus (VolumeNeedleStatusRequest) returns (VolumeNeedleStatusResponse) {
     }
+
+    rpc Ping (PingRequest) returns (PingResponse) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -573,3 +577,13 @@ message VolumeNeedleStatusResponse {
     uint32 crc = 5;
     string ttl = 6;
 }
+
+message PingRequest {
+    string target = 1; // default to ping itself
+    string target_type = 2;
+}
+message PingResponse {
+    int64 start_time_ns = 1;
+    int64 remote_time_ns = 2;
+    int64 stop_time_ns = 3;
+}
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 5ff6aa459..eba9462f9 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.3
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
 // source: volume_server.proto
 
 package volume_server_pb
@@ -4870,6 +4870,124 @@ func (x *VolumeNeedleStatusResponse) GetTtl() string {
 	return ""
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_volume_server_proto_msgTypes[86]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_volume_server_proto_msgTypes[86]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_volume_server_proto_rawDescGZIP(), []int{86}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	StartTimeNs  int64 `protobuf:"varint,1,opt,name=start_time_ns,json=startTimeNs,proto3" json:"start_time_ns,omitempty"`
+	RemoteTimeNs int64 `protobuf:"varint,2,opt,name=remote_time_ns,json=remoteTimeNs,proto3" json:"remote_time_ns,omitempty"`
+	StopTimeNs   int64 `protobuf:"varint,3,opt,name=stop_time_ns,json=stopTimeNs,proto3" json:"stop_time_ns,omitempty"`
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_volume_server_proto_msgTypes[87]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_volume_server_proto_msgTypes[87]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_volume_server_proto_rawDescGZIP(), []int{87}
+}
+
+func (x *PingResponse) GetStartTimeNs() int64 {
+	if x != nil {
+		return x.StartTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetRemoteTimeNs() int64 {
+	if x != nil {
+		return x.RemoteTimeNs
+	}
+	return 0
+}
+
+func (x *PingResponse) GetStopTimeNs() int64 {
+	if x != nil {
+		return x.StopTimeNs
+	}
+	return 0
+}
+
 type FetchAndWriteNeedleRequest_Replica struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4883,7 +5001,7 @@ type FetchAndWriteNeedleRequest_Replica struct {
 func (x *FetchAndWriteNeedleRequest_Replica) Reset() {
 	*x = FetchAndWriteNeedleRequest_Replica{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[86]
+		mi := &file_volume_server_proto_msgTypes[88]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4896,7 +5014,7 @@ func (x *FetchAndWriteNeedleRequest_Replica) String() string {
 func (*FetchAndWriteNeedleRequest_Replica) ProtoMessage() {}
 
 func (x *FetchAndWriteNeedleRequest_Replica) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[86]
+	mi := &file_volume_server_proto_msgTypes[88]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4946,7 +5064,7 @@ type QueryRequest_Filter struct {
 func (x *QueryRequest_Filter) Reset() {
 	*x = QueryRequest_Filter{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[87]
+		mi := &file_volume_server_proto_msgTypes[89]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4959,7 +5077,7 @@ func (x *QueryRequest_Filter) String() string {
 func (*QueryRequest_Filter) ProtoMessage() {}
 
 func (x *QueryRequest_Filter) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[87]
+	mi := &file_volume_server_proto_msgTypes[89]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5011,7 +5129,7 @@ type QueryRequest_InputSerialization struct {
 func (x *QueryRequest_InputSerialization) Reset() {
 	*x = QueryRequest_InputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[88]
+		mi := &file_volume_server_proto_msgTypes[90]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5024,7 +5142,7 @@ func (x *QueryRequest_InputSerialization) String() string {
 func (*QueryRequest_InputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[88]
+	mi := &file_volume_server_proto_msgTypes[90]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5080,7 +5198,7 @@ type QueryRequest_OutputSerialization struct {
 func (x *QueryRequest_OutputSerialization) Reset() {
 	*x = QueryRequest_OutputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[89]
+		mi := &file_volume_server_proto_msgTypes[91]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5093,7 +5211,7 @@ func (x *QueryRequest_OutputSerialization) String() string {
 func (*QueryRequest_OutputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[89]
+	mi := &file_volume_server_proto_msgTypes[91]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5141,7 +5259,7 @@ type QueryRequest_InputSerialization_CSVInput struct {
 func (x *QueryRequest_InputSerialization_CSVInput) Reset() {
 	*x = QueryRequest_InputSerialization_CSVInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[90]
+		mi := &file_volume_server_proto_msgTypes[92]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5154,7 +5272,7 @@ func (x *QueryRequest_InputSerialization_CSVInput) String() string {
 func (*QueryRequest_InputSerialization_CSVInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_CSVInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[90]
+	mi := &file_volume_server_proto_msgTypes[92]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5230,7 +5348,7 @@ type QueryRequest_InputSerialization_JSONInput struct {
 func (x *QueryRequest_InputSerialization_JSONInput) Reset() {
 	*x = QueryRequest_InputSerialization_JSONInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[91]
+		mi := &file_volume_server_proto_msgTypes[93]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5243,7 +5361,7 @@ func (x *QueryRequest_InputSerialization_JSONInput) String() string {
 func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_JSONInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[91]
+	mi := &file_volume_server_proto_msgTypes[93]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5275,7 +5393,7 @@ type QueryRequest_InputSerialization_ParquetInput struct {
 func (x *QueryRequest_InputSerialization_ParquetInput) Reset() {
 	*x = QueryRequest_InputSerialization_ParquetInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[92]
+		mi := &file_volume_server_proto_msgTypes[94]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5288,7 +5406,7 @@ func (x *QueryRequest_InputSerialization_ParquetInput) String() string {
 func (*QueryRequest_InputSerialization_ParquetInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_ParquetInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[92]
+	mi := &file_volume_server_proto_msgTypes[94]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5319,7 +5437,7 @@ type QueryRequest_OutputSerialization_CSVOutput struct {
 func (x *QueryRequest_OutputSerialization_CSVOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_CSVOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[93]
+		mi := &file_volume_server_proto_msgTypes[95]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5332,7 +5450,7 @@ func (x *QueryRequest_OutputSerialization_CSVOutput) String() string {
 func (*QueryRequest_OutputSerialization_CSVOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_CSVOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[93]
+	mi := &file_volume_server_proto_msgTypes[95]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5394,7 +5512,7 @@ type QueryRequest_OutputSerialization_JSONOutput struct {
 func (x *QueryRequest_OutputSerialization_JSONOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_JSONOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[94]
+		mi := &file_volume_server_proto_msgTypes[96]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5407,7 +5525,7 @@ func (x *QueryRequest_OutputSerialization_JSONOutput) String() string {
 func (*QueryRequest_OutputSerialization_JSONOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_JSONOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[94]
+	mi := &file_volume_server_proto_msgTypes[96]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -6064,292 +6182,309 @@ var file_volume_server_proto_rawDesc = []byte{
 	0x66, 0x69, 0x65, 0x64, 0x18, 0x04, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0c, 0x6c, 0x61, 0x73, 0x74,
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 }
 
 var (
@@ -6364,7 +6499,7 @@ func file_volume_server_proto_rawDescGZIP() []byte {
 	return file_volume_server_proto_rawDescData
 }
 
-var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 95)
+var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 97)
 var file_volume_server_proto_goTypes = []interface{}{
 	(*BatchDeleteRequest)(nil),                           // 0: volume_server_pb.BatchDeleteRequest
 	(*BatchDeleteResponse)(nil),                          // 1: volume_server_pb.BatchDeleteResponse
@@ -6452,34 +6587,36 @@ var file_volume_server_proto_goTypes = []interface{}{
 	(*QueriedStripe)(nil),                                // 83: volume_server_pb.QueriedStripe
 	(*VolumeNeedleStatusRequest)(nil),                    // 84: volume_server_pb.VolumeNeedleStatusRequest
 	(*VolumeNeedleStatusResponse)(nil),                   // 85: volume_server_pb.VolumeNeedleStatusResponse
-	(*FetchAndWriteNeedleRequest_Replica)(nil),           // 86: volume_server_pb.FetchAndWriteNeedleRequest.Replica
-	(*QueryRequest_Filter)(nil),                          // 87: volume_server_pb.QueryRequest.Filter
-	(*QueryRequest_InputSerialization)(nil),              // 88: volume_server_pb.QueryRequest.InputSerialization
-	(*QueryRequest_OutputSerialization)(nil),             // 89: volume_server_pb.QueryRequest.OutputSerialization
-	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 90: volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 91: volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 92: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 93: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 94: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
-	(*remote_pb.RemoteConf)(nil),                         // 95: remote_pb.RemoteConf
-	(*remote_pb.RemoteStorageLocation)(nil),              // 96: remote_pb.RemoteStorageLocation
+	(*PingRequest)(nil),                                  // 86: volume_server_pb.PingRequest
+	(*PingResponse)(nil),                                 // 87: volume_server_pb.PingResponse
+	(*FetchAndWriteNeedleRequest_Replica)(nil),           // 88: volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	(*QueryRequest_Filter)(nil),                          // 89: volume_server_pb.QueryRequest.Filter
+	(*QueryRequest_InputSerialization)(nil),              // 90: volume_server_pb.QueryRequest.InputSerialization
+	(*QueryRequest_OutputSerialization)(nil),             // 91: volume_server_pb.QueryRequest.OutputSerialization
+	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 92: volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 93: volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 94: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 95: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 96: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	(*remote_pb.RemoteConf)(nil),                         // 97: remote_pb.RemoteConf
+	(*remote_pb.RemoteStorageLocation)(nil),              // 98: remote_pb.RemoteStorageLocation
 }
 var file_volume_server_proto_depIdxs = []int32{
 	2,  // 0: volume_server_pb.BatchDeleteResponse.results:type_name -> volume_server_pb.DeleteResult
 	70, // 1: volume_server_pb.VolumeInfo.files:type_name -> volume_server_pb.RemoteFile
 	68, // 2: volume_server_pb.VolumeServerStatusResponse.disk_statuses:type_name -> volume_server_pb.DiskStatus
 	69, // 3: volume_server_pb.VolumeServerStatusResponse.memory_status:type_name -> volume_server_pb.MemStatus
-	86, // 4: volume_server_pb.FetchAndWriteNeedleRequest.replicas:type_name -> volume_server_pb.FetchAndWriteNeedleRequest.Replica
-	95, // 5: volume_server_pb.FetchAndWriteNeedleRequest.remote_conf:type_name -> remote_pb.RemoteConf
-	96, // 6: volume_server_pb.FetchAndWriteNeedleRequest.remote_location:type_name -> remote_pb.RemoteStorageLocation
-	87, // 7: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
-	88, // 8: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
-	89, // 9: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
-	90, // 10: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	91, // 11: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	92, // 12: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	93, // 13: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	94, // 14: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	88, // 4: volume_server_pb.FetchAndWriteNeedleRequest.replicas:type_name -> volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	97, // 5: volume_server_pb.FetchAndWriteNeedleRequest.remote_conf:type_name -> remote_pb.RemoteConf
+	98, // 6: volume_server_pb.FetchAndWriteNeedleRequest.remote_location:type_name -> remote_pb.RemoteStorageLocation
+	89, // 7: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
+	90, // 8: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
+	91, // 9: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
+	92, // 10: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	93, // 11: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	94, // 12: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	95, // 13: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	96, // 14: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
 	0,  // 15: volume_server_pb.VolumeServer.BatchDelete:input_type -> volume_server_pb.BatchDeleteRequest
 	4,  // 16: volume_server_pb.VolumeServer.VacuumVolumeCheck:input_type -> volume_server_pb.VacuumVolumeCheckRequest
 	6,  // 17: volume_server_pb.VolumeServer.VacuumVolumeCompact:input_type -> volume_server_pb.VacuumVolumeCompactRequest
@@ -6520,48 +6657,50 @@ var file_volume_server_proto_depIdxs = []int32{
 	80, // 52: volume_server_pb.VolumeServer.FetchAndWriteNeedle:input_type -> volume_server_pb.FetchAndWriteNeedleRequest
 	82, // 53: volume_server_pb.VolumeServer.Query:input_type -> volume_server_pb.QueryRequest
 	84, // 54: volume_server_pb.VolumeServer.VolumeNeedleStatus:input_type -> volume_server_pb.VolumeNeedleStatusRequest
-	1,  // 55: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
-	5,  // 56: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
-	7,  // 57: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
-	9,  // 58: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
-	11, // 59: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
-	13, // 60: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
-	15, // 61: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
-	17, // 62: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
-	19, // 63: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
-	21, // 64: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
-	23, // 65: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
-	25, // 66: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
-	27, // 67: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
-	29, // 68: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
-	31, // 69: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
-	33, // 70: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
-	35, // 71: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
-	67, // 72: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
-	37, // 73: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
-	39, // 74: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
-	41, // 75: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
-	43, // 76: volume_server_pb.VolumeServer.ReadAllNeedles:output_type -> volume_server_pb.ReadAllNeedlesResponse
-	45, // 77: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
-	47, // 78: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
-	49, // 79: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
-	51, // 80: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
-	53, // 81: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
-	55, // 82: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
-	57, // 83: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
-	59, // 84: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
-	61, // 85: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
-	63, // 86: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
-	65, // 87: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
-	73, // 88: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
-	75, // 89: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
-	77, // 90: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
-	79, // 91: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
-	81, // 92: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
-	83, // 93: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
-	85, // 94: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
-	55, // [55:95] is the sub-list for method output_type
-	15, // [15:55] is the sub-list for method input_type
+	86, // 55: volume_server_pb.VolumeServer.Ping:input_type -> volume_server_pb.PingRequest
+	1,  // 56: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
+	5,  // 57: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
+	7,  // 58: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
+	9,  // 59: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
+	11, // 60: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
+	13, // 61: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
+	15, // 62: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
+	17, // 63: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
+	19, // 64: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
+	21, // 65: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
+	23, // 66: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
+	25, // 67: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
+	27, // 68: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
+	29, // 69: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
+	31, // 70: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
+	33, // 71: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
+	35, // 72: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
+	67, // 73: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
+	37, // 74: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
+	39, // 75: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
+	41, // 76: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
+	43, // 77: volume_server_pb.VolumeServer.ReadAllNeedles:output_type -> volume_server_pb.ReadAllNeedlesResponse
+	45, // 78: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
+	47, // 79: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
+	49, // 80: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
+	51, // 81: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
+	53, // 82: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
+	55, // 83: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
+	57, // 84: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
+	59, // 85: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
+	61, // 86: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
+	63, // 87: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
+	65, // 88: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
+	73, // 89: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
+	75, // 90: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
+	77, // 91: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
+	79, // 92: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
+	81, // 93: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
+	83, // 94: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
+	85, // 95: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
+	87, // 96: volume_server_pb.VolumeServer.Ping:output_type -> volume_server_pb.PingResponse
+	56, // [56:97] is the sub-list for method output_type
+	15, // [15:56] is the sub-list for method input_type
 	15, // [15:15] is the sub-list for extension type_name
 	15, // [15:15] is the sub-list for extension extendee
 	0,  // [0:15] is the sub-list for field type_name
@@ -7606,7 +7745,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[86].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FetchAndWriteNeedleRequest_Replica); i {
+			switch v := v.(*PingRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7618,7 +7757,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[87].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_Filter); i {
+			switch v := v.(*PingResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7630,7 +7769,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[88].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization); i {
+			switch v := v.(*FetchAndWriteNeedleRequest_Replica); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7642,7 +7781,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[89].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization); i {
+			switch v := v.(*QueryRequest_Filter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7654,7 +7793,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[90].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
+			switch v := v.(*QueryRequest_InputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7666,7 +7805,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[91].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
+			switch v := v.(*QueryRequest_OutputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7678,7 +7817,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[92].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
+			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7690,7 +7829,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[93].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7702,6 +7841,30 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[94].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_volume_server_proto_msgTypes[95].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_volume_server_proto_msgTypes[96].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*QueryRequest_OutputSerialization_JSONOutput); i {
 			case 0:
 				return &v.state
@@ -7720,7 +7883,7 @@ func file_volume_server_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_volume_server_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   95,
+			NumMessages:   97,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/volume_server_pb/volume_server_grpc.pb.go b/weed/pb/volume_server_pb/volume_server_grpc.pb.go
index 3334eb61b..4025c9b63 100644
--- a/weed/pb/volume_server_pb/volume_server_grpc.pb.go
+++ b/weed/pb/volume_server_pb/volume_server_grpc.pb.go
@@ -11,7 +11,6 @@ import (
 
 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-// Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
 // VolumeServerClient is the client API for VolumeServer service.
@@ -64,6 +63,7 @@ type VolumeServerClient interface {
 	// <experimental> query
 	Query(ctx context.Context, in *QueryRequest, opts ...grpc.CallOption) (VolumeServer_QueryClient, error)
 	VolumeNeedleStatus(ctx context.Context, in *VolumeNeedleStatusRequest, opts ...grpc.CallOption) (*VolumeNeedleStatusResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 }
 
 type volumeServerClient struct {
@@ -664,6 +664,15 @@ func (c *volumeServerClient) VolumeNeedleStatus(ctx context.Context, in *VolumeN
 	return out, nil
 }
 
+func (c *volumeServerClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/volume_server_pb.VolumeServer/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // VolumeServerServer is the server API for VolumeServer service.
 // All implementations must embed UnimplementedVolumeServerServer
 // for forward compatibility
@@ -714,6 +723,7 @@ type VolumeServerServer interface {
 	// <experimental> query
 	Query(*QueryRequest, VolumeServer_QueryServer) error
 	VolumeNeedleStatus(context.Context, *VolumeNeedleStatusRequest) (*VolumeNeedleStatusResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	mustEmbedUnimplementedVolumeServerServer()
 }
 
@@ -841,6 +851,9 @@ func (UnimplementedVolumeServerServer) Query(*QueryRequest, VolumeServer_QuerySe
 func (UnimplementedVolumeServerServer) VolumeNeedleStatus(context.Context, *VolumeNeedleStatusRequest) (*VolumeNeedleStatusResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method VolumeNeedleStatus not implemented")
 }
+func (UnimplementedVolumeServerServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedVolumeServerServer) mustEmbedUnimplementedVolumeServerServer() {}
 
 // UnsafeVolumeServerServer may be embedded to opt out of forward compatibility for this service.
@@ -1604,6 +1617,24 @@ func _VolumeServer_VolumeNeedleStatus_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }
 
+func _VolumeServer_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(VolumeServerServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/volume_server_pb.VolumeServer/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(VolumeServerServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // VolumeServer_ServiceDesc is the grpc.ServiceDesc for VolumeServer service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -1731,6 +1762,10 @@ var VolumeServer_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "VolumeNeedleStatus",
 			Handler:    _VolumeServer_VolumeNeedleStatus_Handler,
 		},
+		{
+			MethodName: "Ping",
+			Handler:    _VolumeServer_Ping_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/weed/remote_storage/remote_storage.go b/weed/remote_storage/remote_storage.go
index d8d1e1f5c..e4a027199 100644
--- a/weed/remote_storage/remote_storage.go
+++ b/weed/remote_storage/remote_storage.go
@@ -12,11 +12,11 @@ import (
 	"time"
 )
 
+const slash = "/"
+
 func ParseLocationName(remote string) (locationName string) {
-	if strings.HasSuffix(string(remote), "/") {
-		remote = remote[:len(remote)-1]
-	}
-	parts := strings.SplitN(string(remote), "/", 2)
+	remote = strings.TrimSuffix(remote, slash)
+	parts := strings.SplitN(remote, slash, 2)
 	if len(parts) >= 1 {
 		return parts[0]
 	}
@@ -25,35 +25,31 @@ func ParseLocationName(remote string) (locationName string) {
 
 func parseBucketLocation(remote string) (loc *remote_pb.RemoteStorageLocation) {
 	loc = &remote_pb.RemoteStorageLocation{}
-	if strings.HasSuffix(string(remote), "/") {
-		remote = remote[:len(remote)-1]
-	}
-	parts := strings.SplitN(string(remote), "/", 3)
+	remote = strings.TrimSuffix(remote, slash)
+	parts := strings.SplitN(remote, slash, 3)
 	if len(parts) >= 1 {
 		loc.Name = parts[0]
 	}
 	if len(parts) >= 2 {
 		loc.Bucket = parts[1]
 	}
-	loc.Path = string(remote[len(loc.Name)+1+len(loc.Bucket):])
+	loc.Path = remote[len(loc.Name)+1+len(loc.Bucket):]
 	if loc.Path == "" {
-		loc.Path = "/"
+		loc.Path = slash
 	}
 	return
 }
 
 func parseNoBucketLocation(remote string) (loc *remote_pb.RemoteStorageLocation) {
 	loc = &remote_pb.RemoteStorageLocation{}
-	if strings.HasSuffix(string(remote), "/") {
-		remote = remote[:len(remote)-1]
-	}
-	parts := strings.SplitN(string(remote), "/", 2)
+	remote = strings.TrimSuffix(remote, slash)
+	parts := strings.SplitN(remote, slash, 2)
 	if len(parts) >= 1 {
 		loc.Name = parts[0]
 	}
-	loc.Path = string(remote[len(loc.Name):])
+	loc.Path = remote[len(loc.Name):]
 	if loc.Path == "" {
-		loc.Path = "/"
+		loc.Path = slash
 	}
 	return
 }
diff --git a/weed/s3api/filer_multipart.go b/weed/s3api/filer_multipart.go
index 5a039382b..659cf4c96 100644
--- a/weed/s3api/filer_multipart.go
+++ b/weed/s3api/filer_multipart.go
@@ -1,9 +1,11 @@
 package s3api
 
 import (
+	"encoding/hex"
 	"encoding/xml"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
+	"golang.org/x/exp/slices"
 	"path/filepath"
 	"sort"
 	"strconv"
@@ -12,7 +14,6 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/s3"
-	"github.com/google/uuid"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -28,8 +29,7 @@ func (s3a *S3ApiServer) createMultipartUpload(input *s3.CreateMultipartUploadInp
 
 	glog.V(2).Infof("createMultipartUpload input %v", input)
 
-	uploadId, _ := uuid.NewRandom()
-	uploadIdString := uploadId.String()
+	uploadIdString := s3a.generateUploadID(*input.Key)
 
 	if err := s3a.mkdir(s3a.genUploadsFolder(*input.Bucket), uploadIdString, func(entry *filer_pb.Entry) {
 		if entry.Extended == nil {
@@ -68,8 +68,8 @@ func (s3a *S3ApiServer) completeMultipartUpload(input *s3.CompleteMultipartUploa
 	glog.V(2).Infof("completeMultipartUpload input %v", input)
 
 	completedParts := parts.Parts
-	sort.Slice(completedParts, func(i, j int) bool {
-		return completedParts[i].PartNumber < completedParts[j].PartNumber
+	slices.SortFunc(completedParts, func(a, b CompletedPart) bool {
+		return a.PartNumber < b.PartNumber
 	})
 
 	uploadDirectory := s3a.genUploadsFolder(*input.Bucket) + "/" + *input.UploadId
@@ -93,10 +93,15 @@ func (s3a *S3ApiServer) completeMultipartUpload(input *s3.CompleteMultipartUploa
 
 	for _, entry := range entries {
 		if strings.HasSuffix(entry.Name, ".part") && !entry.IsDirectory {
-			_, found := findByPartNumber(entry.Name, completedParts)
+			partETag, found := findByPartNumber(entry.Name, completedParts)
 			if !found {
 				continue
 			}
+			entryETag := hex.EncodeToString(entry.Attributes.GetMd5())
+			if partETag != "" && len(partETag) == 32 && entryETag != "" && entryETag != partETag {
+				glog.Errorf("completeMultipartUpload %s ETag mismatch chunk: %s part: %s", entry.Name, entryETag, partETag)
+				return nil, s3err.ErrInvalidPart
+			}
 			for _, chunk := range entry.Chunks {
 				p := &filer_pb.FileChunk{
 					FileId:    chunk.GetFileIdString(),
@@ -175,7 +180,15 @@ func findByPartNumber(fileName string, parts []CompletedPart) (etag string, foun
 	if parts[x].PartNumber != partNumber {
 		return
 	}
-	return parts[x].ETag, true
+	y := 0
+	for i, part := range parts[x:] {
+		if part.PartNumber == partNumber {
+			y = i
+		} else {
+			break
+		}
+	}
+	return parts[x+y].ETag, true
 }
 
 func (s3a *S3ApiServer) abortMultipartUpload(input *s3.AbortMultipartUploadInput) (output *s3.AbortMultipartUploadOutput, code s3err.ErrorCode) {
diff --git a/weed/s3api/filer_multipart_test.go b/weed/s3api/filer_multipart_test.go
index 52425b5b2..fe2b9c0ce 100644
--- a/weed/s3api/filer_multipart_test.go
+++ b/weed/s3api/filer_multipart_test.go
@@ -62,6 +62,10 @@ func Test_findByPartNumber(t *testing.T) {
 			PartNumber: 1,
 		},
 		CompletedPart{
+			ETag:       "lll",
+			PartNumber: 1,
+		},
+		CompletedPart{
 			ETag:       "yyy",
 			PartNumber: 3,
 		},
@@ -83,7 +87,7 @@ func Test_findByPartNumber(t *testing.T) {
 				"0001.part",
 				parts,
 			},
-			"xxx",
+			"lll",
 			true,
 		},
 		{
diff --git a/weed/s3api/s3api_bucket_handlers.go b/weed/s3api/s3api_bucket_handlers.go
index 3d35e5216..7de1d5ebb 100644
--- a/weed/s3api/s3api_bucket_handlers.go
+++ b/weed/s3api/s3api_bucket_handlers.go
@@ -3,6 +3,7 @@ package s3api
 import (
 	"context"
 	"encoding/xml"
+	"errors"
 	"fmt"
 	"math"
 	"net/http"
@@ -134,6 +135,7 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
+	w.Header().Set("Location", "/" + bucket)
 	writeSuccessResponseEmpty(w, r)
 }
 
@@ -148,6 +150,15 @@ func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Reque
 	}
 
 	err := s3a.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+		if !s3a.option.AllowDeleteBucketNotEmpty {
+			entries, _, err := s3a.list(s3a.option.BucketsPath+"/"+bucket, "", "", false, 1)
+			if err != nil {
+				return fmt.Errorf("failed to list bucket %s: %v", bucket, err)
+			}
+			if len(entries) > 0 {
+				return errors.New(s3err.GetAPIError(s3err.ErrBucketNotEmpty).Code)
+			}
+		}
 
 		// delete collection
 		deleteCollectionRequest := &filer_pb.DeleteCollectionRequest{
@@ -162,6 +173,15 @@ func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Reque
 		return nil
 	})
 
+	if err != nil {
+		s3ErrorCode := s3err.ErrInternalError
+		if err.Error() == s3err.GetAPIError(s3err.ErrBucketNotEmpty).Code {
+			s3ErrorCode = s3err.ErrBucketNotEmpty
+		}
+		s3err.WriteErrorResponse(w, r, s3ErrorCode)
+		return
+	}
+
 	err = s3a.rm(s3a.option.BucketsPath, bucket, false, true)
 
 	if err != nil {
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 6bcf2266f..3d26d395e 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -8,10 +8,10 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util/mem"
+	"golang.org/x/exp/slices"
 	"io"
 	"net/http"
 	"net/url"
-	"sort"
 	"strings"
 	"time"
 
@@ -27,6 +27,10 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
+const (
+	deleteMultipleObjectsLimmit = 1000
+)
+
 func mimeDetect(r *http.Request, dataReader io.Reader) io.ReadCloser {
 	mimeBuffer := make([]byte, 512)
 	size, _ := dataReader.Read(mimeBuffer)
@@ -59,7 +63,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 
 	if r.Header.Get("Expires") != "" {
 		if _, err = time.Parse(http.TimeFormat, r.Header.Get("Expires")); err != nil {
-			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidDigest)
+			s3err.WriteErrorResponse(w, r, s3err.ErrMalformedExpires)
 			return
 		}
 	}
@@ -217,6 +221,11 @@ func (s3a *S3ApiServer) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *h
 		return
 	}
 
+	if len(deleteObjects.Objects) > deleteMultipleObjectsLimmit {
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxDeleteObjects)
+		return
+	}
+
 	var deletedObjects []ObjectIdentifier
 	var deleteErrors []DeleteError
 	var auditLog *s3err.AccessLog
@@ -281,8 +290,8 @@ func (s3a *S3ApiServer) doDeleteEmptyDirectories(client filer_pb.SeaweedFilerCli
 	for dir, _ := range directoriesWithDeletion {
 		allDirs = append(allDirs, dir)
 	}
-	sort.Slice(allDirs, func(i, j int) bool {
-		return len(allDirs[i]) > len(allDirs[j])
+	slices.SortFunc(allDirs, func(a, b string) bool {
+		return len(a) > len(b)
 	})
 	newDirectoriesWithDeletion = make(map[string]int)
 	for _, dir := range allDirs {
diff --git a/weed/s3api/s3api_object_multipart_handlers.go b/weed/s3api/s3api_object_multipart_handlers.go
index 35bc174c8..d2fa21c2e 100644
--- a/weed/s3api/s3api_object_multipart_handlers.go
+++ b/weed/s3api/s3api_object_multipart_handlers.go
@@ -2,6 +2,7 @@ package s3api
 
 import (
 	"encoding/xml"
+	"crypto/sha1"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	xhttp "github.com/chrislusf/seaweedfs/weed/s3api/http"
@@ -70,6 +71,11 @@ func (s3a *S3ApiServer) CompleteMultipartUploadHandler(w http.ResponseWriter, r
 
 	// Get upload id.
 	uploadID, _, _, _ := getObjectResources(r.URL.Query())
+	err := s3a.checkUploadId(object, uploadID)
+	if err != nil {
+		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchUpload)
+		return
+	}
 
 	response, errCode := s3a.completeMultipartUpload(&s3.CompleteMultipartUploadInput{
 		Bucket:   aws.String(bucket),
@@ -94,6 +100,11 @@ func (s3a *S3ApiServer) AbortMultipartUploadHandler(w http.ResponseWriter, r *ht
 
 	// Get upload id.
 	uploadID, _, _, _ := getObjectResources(r.URL.Query())
+	err := s3a.checkUploadId(object, uploadID)
+	if err != nil {
+		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchUpload)
+		return
+	}
 
 	response, errCode := s3a.abortMultipartUpload(&s3.AbortMultipartUploadInput{
 		Bucket:   aws.String(bucket),
@@ -165,6 +176,12 @@ func (s3a *S3ApiServer) ListObjectPartsHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 
+	err := s3a.checkUploadId(object, uploadID)
+	if err != nil {
+		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchUpload)
+		return
+	}
+
 	response, errCode := s3a.listObjectParts(&s3.ListPartsInput{
 		Bucket:           aws.String(bucket),
 		Key:              objectKey(aws.String(object)),
@@ -186,11 +203,11 @@ func (s3a *S3ApiServer) ListObjectPartsHandler(w http.ResponseWriter, r *http.Re
 
 // PutObjectPartHandler - Put an object part in a multipart upload.
 func (s3a *S3ApiServer) PutObjectPartHandler(w http.ResponseWriter, r *http.Request) {
-	bucket, _ := xhttp.GetBucketAndObject(r)
+	bucket, object := xhttp.GetBucketAndObject(r)
 
 	uploadID := r.URL.Query().Get("uploadId")
-	exists, err := s3a.exists(s3a.genUploadsFolder(bucket), uploadID, true)
-	if !exists {
+	err := s3a.checkUploadId(object, uploadID)
+	if err != nil {
 		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchUpload)
 		return
 	}
@@ -250,6 +267,27 @@ func (s3a *S3ApiServer) genUploadsFolder(bucket string) string {
 	return fmt.Sprintf("%s/%s/.uploads", s3a.option.BucketsPath, bucket)
 }
 
+// Generate uploadID hash string from object
+func (s3a *S3ApiServer) generateUploadID(object string) string {
+	if strings.HasPrefix(object, "/") {
+		object = object[1:]
+	}
+	h := sha1.New()
+	h.Write([]byte(object))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+//Check object name and uploadID when processing  multipart uploading
+func (s3a *S3ApiServer) checkUploadId(object string, id string) error {
+
+	hash := s3a.generateUploadID(object)
+	if hash != id {
+		glog.Errorf("object %s and uploadID %s are not matched", object, id)
+		return fmt.Errorf("object %s and uploadID %s are not matched", object, id)
+	}
+	return nil
+}
+
 // Parse bucket url queries for ?uploads
 func getBucketMultipartResources(values url.Values) (prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int, encodingType string) {
 	prefix = values.Get("prefix")
diff --git a/weed/s3api/s3api_server.go b/weed/s3api/s3api_server.go
index fe069595d..561edd924 100644
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@@ -19,14 +19,15 @@ import (
 )
 
 type S3ApiServerOption struct {
-	Filer            pb.ServerAddress
-	Port             int
-	Config           string
-	DomainName       string
-	BucketsPath      string
-	GrpcDialOption   grpc.DialOption
-	AllowEmptyFolder bool
-	LocalFilerSocket *string
+	Filer                     pb.ServerAddress
+	Port                      int
+	Config                    string
+	DomainName                string
+	BucketsPath               string
+	GrpcDialOption            grpc.DialOption
+	AllowEmptyFolder          bool
+	AllowDeleteBucketNotEmpty bool
+	LocalFilerSocket          *string
 }
 
 type S3ApiServer struct {
diff --git a/weed/s3api/s3err/s3api_errors.go b/weed/s3api/s3err/s3api_errors.go
index f4a83d979..52803f398 100644
--- a/weed/s3api/s3err/s3api_errors.go
+++ b/weed/s3api/s3err/s3api_errors.go
@@ -61,6 +61,7 @@ const (
 	ErrInvalidMaxKeys
 	ErrInvalidMaxUploads
 	ErrInvalidMaxParts
+	ErrInvalidMaxDeleteObjects
 	ErrInvalidPartNumberMarker
 	ErrInvalidPart
 	ErrInternalError
@@ -157,6 +158,11 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		Description:    "Argument max-parts must be an integer between 0 and 2147483647",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrInvalidMaxDeleteObjects: {
+		Code:           "InvalidArgument",
+		Description:    "Argument objects can contain a list of up to 1000 keys",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrInvalidPartNumberMarker: {
 		Code:           "InvalidArgument",
 		Description:    "Argument partNumberMarker must be an integer.",
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 3f65660ee..67d4aaaaf 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -3,7 +3,6 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -357,128 +356,3 @@ func (fs *FilerServer) DeleteCollection(ctx context.Context, req *filer_pb.Delet
 
 	return &filer_pb.DeleteCollectionResponse{}, err
 }
-
-func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsRequest) (resp *filer_pb.StatisticsResponse, err error) {
-
-	var output *master_pb.StatisticsResponse
-
-	err = fs.filer.MasterClient.WithClient(false, func(masterClient master_pb.SeaweedClient) error {
-		grpcResponse, grpcErr := masterClient.Statistics(context.Background(), &master_pb.StatisticsRequest{
-			Replication: req.Replication,
-			Collection:  req.Collection,
-			Ttl:         req.Ttl,
-			DiskType:    req.DiskType,
-		})
-		if grpcErr != nil {
-			return grpcErr
-		}
-
-		output = grpcResponse
-		return nil
-	})
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &filer_pb.StatisticsResponse{
-		TotalSize: output.TotalSize,
-		UsedSize:  output.UsedSize,
-		FileCount: output.FileCount,
-	}, nil
-}
-
-func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.GetFilerConfigurationRequest) (resp *filer_pb.GetFilerConfigurationResponse, err error) {
-
-	clusterId, _ := fs.filer.Store.KvGet(context.Background(), []byte("clusterId"))
-
-	t := &filer_pb.GetFilerConfigurationResponse{
-		Masters:            pb.ToAddressStrings(fs.option.Masters),
-		Collection:         fs.option.Collection,
-		Replication:        fs.option.DefaultReplication,
-		MaxMb:              uint32(fs.option.MaxMB),
-		DirBuckets:         fs.filer.DirBucketsPath,
-		Cipher:             fs.filer.Cipher,
-		Signature:          fs.filer.Signature,
-		MetricsAddress:     fs.metricsAddress,
-		MetricsIntervalSec: int32(fs.metricsIntervalSec),
-		Version:            util.Version(),
-		ClusterId:          string(clusterId),
-	}
-
-	glog.V(4).Infof("GetFilerConfiguration: %v", t)
-
-	return t, nil
-}
-
-func (fs *FilerServer) KeepConnected(stream filer_pb.SeaweedFiler_KeepConnectedServer) error {
-
-	req, err := stream.Recv()
-	if err != nil {
-		return err
-	}
-
-	clientName := util.JoinHostPort(req.Name, int(req.GrpcPort))
-	m := make(map[string]bool)
-	for _, tp := range req.Resources {
-		m[tp] = true
-	}
-	fs.brokersLock.Lock()
-	fs.brokers[clientName] = m
-	glog.V(0).Infof("+ broker %v", clientName)
-	fs.brokersLock.Unlock()
-
-	defer func() {
-		fs.brokersLock.Lock()
-		delete(fs.brokers, clientName)
-		glog.V(0).Infof("- broker %v: %v", clientName, err)
-		fs.brokersLock.Unlock()
-	}()
-
-	for {
-		if err := stream.Send(&filer_pb.KeepConnectedResponse{}); err != nil {
-			glog.V(0).Infof("send broker %v: %+v", clientName, err)
-			return err
-		}
-		// println("replied")
-
-		if _, err := stream.Recv(); err != nil {
-			glog.V(0).Infof("recv broker %v: %v", clientName, err)
-			return err
-		}
-		// println("received")
-	}
-
-}
-
-func (fs *FilerServer) LocateBroker(ctx context.Context, req *filer_pb.LocateBrokerRequest) (resp *filer_pb.LocateBrokerResponse, err error) {
-
-	resp = &filer_pb.LocateBrokerResponse{}
-
-	fs.brokersLock.Lock()
-	defer fs.brokersLock.Unlock()
-
-	var localBrokers []*filer_pb.LocateBrokerResponse_Resource
-
-	for b, m := range fs.brokers {
-		if _, found := m[req.Resource]; found {
-			resp.Found = true
-			resp.Resources = []*filer_pb.LocateBrokerResponse_Resource{
-				{
-					GrpcAddresses: b,
-					ResourceCount: int32(len(m)),
-				},
-			}
-			return
-		}
-		localBrokers = append(localBrokers, &filer_pb.LocateBrokerResponse_Resource{
-			GrpcAddresses: b,
-			ResourceCount: int32(len(m)),
-		})
-	}
-
-	resp.Resources = localBrokers
-
-	return resp, nil
-
-}
diff --git a/weed/server/filer_grpc_server_admin.go b/weed/server/filer_grpc_server_admin.go
new file mode 100644
index 000000000..5341fc52f
--- /dev/null
+++ b/weed/server/filer_grpc_server_admin.go
@@ -0,0 +1,177 @@
+package weed_server
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"time"
+)
+
+func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsRequest) (resp *filer_pb.StatisticsResponse, err error) {
+
+	var output *master_pb.StatisticsResponse
+
+	err = fs.filer.MasterClient.WithClient(false, func(masterClient master_pb.SeaweedClient) error {
+		grpcResponse, grpcErr := masterClient.Statistics(context.Background(), &master_pb.StatisticsRequest{
+			Replication: req.Replication,
+			Collection:  req.Collection,
+			Ttl:         req.Ttl,
+			DiskType:    req.DiskType,
+		})
+		if grpcErr != nil {
+			return grpcErr
+		}
+
+		output = grpcResponse
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &filer_pb.StatisticsResponse{
+		TotalSize: output.TotalSize,
+		UsedSize:  output.UsedSize,
+		FileCount: output.FileCount,
+	}, nil
+}
+
+func (fs *FilerServer) Ping(ctx context.Context, req *filer_pb.PingRequest) (resp *filer_pb.PingResponse, pingErr error) {
+	resp = &filer_pb.PingResponse{
+		StartTimeNs: time.Now().UnixNano(),
+	}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			pingResp, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			pingResp, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			pingResp, err := client.Ping(ctx, &master_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	resp.StopTimeNs = time.Now().UnixNano()
+	return
+}
+
+func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.GetFilerConfigurationRequest) (resp *filer_pb.GetFilerConfigurationResponse, err error) {
+
+	clusterId, _ := fs.filer.Store.KvGet(context.Background(), []byte("clusterId"))
+
+	t := &filer_pb.GetFilerConfigurationResponse{
+		Masters:            pb.ToAddressStringsFromMap(fs.option.Masters),
+		Collection:         fs.option.Collection,
+		Replication:        fs.option.DefaultReplication,
+		MaxMb:              uint32(fs.option.MaxMB),
+		DirBuckets:         fs.filer.DirBucketsPath,
+		Cipher:             fs.filer.Cipher,
+		Signature:          fs.filer.Signature,
+		MetricsAddress:     fs.metricsAddress,
+		MetricsIntervalSec: int32(fs.metricsIntervalSec),
+		Version:            util.Version(),
+		ClusterId:          string(clusterId),
+	}
+
+	glog.V(4).Infof("GetFilerConfiguration: %v", t)
+
+	return t, nil
+}
+
+func (fs *FilerServer) KeepConnected(stream filer_pb.SeaweedFiler_KeepConnectedServer) error {
+
+	req, err := stream.Recv()
+	if err != nil {
+		return err
+	}
+
+	clientName := util.JoinHostPort(req.Name, int(req.GrpcPort))
+	m := make(map[string]bool)
+	for _, tp := range req.Resources {
+		m[tp] = true
+	}
+	fs.brokersLock.Lock()
+	fs.brokers[clientName] = m
+	glog.V(0).Infof("+ broker %v", clientName)
+	fs.brokersLock.Unlock()
+
+	defer func() {
+		fs.brokersLock.Lock()
+		delete(fs.brokers, clientName)
+		glog.V(0).Infof("- broker %v: %v", clientName, err)
+		fs.brokersLock.Unlock()
+	}()
+
+	for {
+		if err := stream.Send(&filer_pb.KeepConnectedResponse{}); err != nil {
+			glog.V(0).Infof("send broker %v: %+v", clientName, err)
+			return err
+		}
+		// println("replied")
+
+		if _, err := stream.Recv(); err != nil {
+			glog.V(0).Infof("recv broker %v: %v", clientName, err)
+			return err
+		}
+		// println("received")
+	}
+
+}
+
+func (fs *FilerServer) LocateBroker(ctx context.Context, req *filer_pb.LocateBrokerRequest) (resp *filer_pb.LocateBrokerResponse, err error) {
+
+	resp = &filer_pb.LocateBrokerResponse{}
+
+	fs.brokersLock.Lock()
+	defer fs.brokersLock.Unlock()
+
+	var localBrokers []*filer_pb.LocateBrokerResponse_Resource
+
+	for b, m := range fs.brokers {
+		if _, found := m[req.Resource]; found {
+			resp.Found = true
+			resp.Resources = []*filer_pb.LocateBrokerResponse_Resource{
+				{
+					GrpcAddresses: b,
+					ResourceCount: int32(len(m)),
+				},
+			}
+			return
+		}
+		localBrokers = append(localBrokers, &filer_pb.LocateBrokerResponse_Resource{
+			GrpcAddresses: b,
+			ResourceCount: int32(len(m)),
+		})
+	}
+
+	resp.Resources = localBrokers
+
+	return resp, nil
+
+}
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 497f59568..7edd5870f 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -48,7 +48,7 @@ import (
 )
 
 type FilerOption struct {
-	Masters               []pb.ServerAddress
+	Masters               map[string]pb.ServerAddress
 	Collection            string
 	DefaultReplication    string
 	DisableDirListing     bool
diff --git a/weed/server/filer_server_handlers_read_dir.go b/weed/server/filer_server_handlers_read_dir.go
index f67e90d38..8382cfc76 100644
--- a/weed/server/filer_server_handlers_read_dir.go
+++ b/weed/server/filer_server_handlers_read_dir.go
@@ -46,8 +46,10 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		path = ""
 	}
 
+	emptyFolder := true
 	if len(entries) > 0 {
 		lastFileName = entries[len(entries)-1].Name()
+		emptyFolder = false
 	}
 
 	glog.V(4).Infof("listDirectory %s, last file %s, limit %d: %d items", path, lastFileName, limit, len(entries))
@@ -59,12 +61,14 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 			Limit                 int
 			LastFileName          string
 			ShouldDisplayLoadMore bool
+			EmptyFolder           bool
 		}{
 			path,
 			entries,
 			limit,
 			lastFileName,
 			shouldDisplayLoadMore,
+			emptyFolder,
 		})
 		return
 	}
@@ -76,6 +80,7 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		Limit                 int
 		LastFileName          string
 		ShouldDisplayLoadMore bool
+		EmptyFolder           bool
 	}{
 		path,
 		ui.ToBreadcrumb(path),
@@ -83,5 +88,6 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		limit,
 		lastFileName,
 		shouldDisplayLoadMore,
+		emptyFolder,
 	})
 }
diff --git a/weed/server/filer_server_handlers_tagging.go b/weed/server/filer_server_handlers_tagging.go
index 1da7ff50f..ae2093947 100644
--- a/weed/server/filer_server_handlers_tagging.go
+++ b/weed/server/filer_server_handlers_tagging.go
@@ -82,7 +82,9 @@ func (fs *FilerServer) DeleteTaggingHandler(w http.ResponseWriter, r *http.Reque
 	toDelete := strings.Split(r.URL.Query().Get("tagging"), ",")
 	deletions := make(map[string]struct{})
 	for _, deletion := range toDelete {
-		deletions[deletion] = struct{}{}
+		if deletion != "" {
+			deletions[deletion] = struct{}{}
+		}
 	}
 
 	// delete all tags or specific tags
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 854b35f82..9bf2df6ef 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -164,6 +164,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	}
 
 	var entry *filer.Entry
+	var newChunks []*filer_pb.FileChunk
 	var mergedChunks []*filer_pb.FileChunk
 
 	isAppend := isAppend(r)
@@ -186,7 +187,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 			}
 			entry.FileSize += uint64(chunkOffset)
 		}
-		mergedChunks = append(entry.Chunks, fileChunks...)
+		newChunks = append(entry.Chunks, fileChunks...)
 
 		// TODO
 		if len(entry.Content) > 0 {
@@ -196,7 +197,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 
 	} else {
 		glog.V(4).Infoln("saving", path)
-		mergedChunks = fileChunks
+		newChunks = fileChunks
 		entry = &filer.Entry{
 			FullPath: util.FullPath(path),
 			Attr: filer.Attr{
@@ -217,6 +218,13 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 		}
 	}
 
+	// maybe concatenate small chunks into one whole chunk
+	mergedChunks, replyerr = fs.maybeMergeChunks(so, newChunks)
+	if replyerr != nil {
+		glog.V(0).Infof("merge chunks %s: %v", r.RequestURI, replyerr)
+		mergedChunks = newChunks
+	}
+
 	// maybe compact entry chunks
 	mergedChunks, replyerr = filer.MaybeManifestize(fs.saveAsChunk(so), mergedChunks)
 	if replyerr != nil {
diff --git a/weed/server/filer_server_handlers_write_merge.go b/weed/server/filer_server_handlers_write_merge.go
new file mode 100644
index 000000000..dadc6f726
--- /dev/null
+++ b/weed/server/filer_server_handlers_write_merge.go
@@ -0,0 +1,11 @@
+package weed_server
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func (fs *FilerServer) maybeMergeChunks(so *operation.StorageOption, inputChunks []*filer_pb.FileChunk) (mergedChunks []*filer_pb.FileChunk, err error) {
+	//TODO merge consecutive smaller chunks into a large chunk to reduce number of chunks
+	return inputChunks, nil
+}
diff --git a/weed/server/filer_server_handlers_write_upload.go b/weed/server/filer_server_handlers_write_upload.go
index 6ee378819..fe3346402 100644
--- a/weed/server/filer_server_handlers_write_upload.go
+++ b/weed/server/filer_server_handlers_write_upload.go
@@ -4,10 +4,10 @@ import (
 	"bytes"
 	"crypto/md5"
 	"fmt"
+	"golang.org/x/exp/slices"
 	"hash"
 	"io"
 	"net/http"
-	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -130,11 +130,9 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque
 		fs.filer.DeleteChunks(fileChunks)
 		return nil, md5Hash, 0, uploadErr, nil
 	}
-
-	sort.Slice(fileChunks, func(i, j int) bool {
-		return fileChunks[i].Offset < fileChunks[j].Offset
+	slices.SortFunc(fileChunks, func(a, b *filer_pb.FileChunk) bool {
+		return a.Offset < b.Offset
 	})
-
 	return fileChunks, md5Hash, chunkOffset, nil, smallContent
 }
 
diff --git a/weed/server/filer_ui/breadcrumb.go b/weed/server/filer_ui/breadcrumb.go
index 5016117a8..3201ff76c 100644
--- a/weed/server/filer_ui/breadcrumb.go
+++ b/weed/server/filer_ui/breadcrumb.go
@@ -15,8 +15,12 @@ func ToBreadcrumb(fullpath string) (crumbs []Breadcrumb) {
 	parts := strings.Split(fullpath, "/")
 
 	for i := 0; i < len(parts); i++ {
+		name := parts[i]
+		if name == "" {
+			name = "/"
+		}
 		crumb := Breadcrumb{
-			Name: parts[i] + " /",
+			Name: name,
 			Link: "/" + util.Join(parts[0:i+1]...),
 		}
 		if !strings.HasSuffix(crumb.Link, "/") {
diff --git a/weed/server/filer_ui/filer.html b/weed/server/filer_ui/filer.html
index 6f57c25d8..785f82887 100644
--- a/weed/server/filer_ui/filer.html
+++ b/weed/server/filer_ui/filer.html
@@ -11,6 +11,7 @@
 
         #drop-area {
             border: 1px transparent;
+            margin-top: 5px;
         }
 
         #drop-area.highlight {
@@ -26,6 +27,12 @@
             border-radius: 2px;
             border: 1px solid #ccc;
             float: right;
+            margin-left: 2px;
+            margin-bottom: 0;
+        }
+
+        label {
+            font-weight: normal;
         }
 
         .button:hover {
@@ -36,6 +43,38 @@
             display: none;
         }
 
+        td, th {
+            vertical-align: bottom;
+        }
+
+        .table-hover > tbody > tr:hover > * > div.operations {
+            display: block;
+        }
+
+        .table > tbody > tr {
+            height: 39px;
+        }
+
+        div.operations {
+            display: none;
+        }
+
+        .footer {
+            position: absolute;
+            bottom: 0px;
+            right: 5%;
+            min-width: 25%;
+            border-left: 1px solid #ccc;
+            border-right: 1px solid #ccc;
+        }
+
+        .add-files {
+            font-size: 46px;
+            text-align: center;
+            border: 1px dashed #999;
+            padding-bottom: 9px;
+            margin: 0 2px;
+        }
     </style>
 </head>
 <body>
@@ -48,12 +87,21 @@
     </div>
     <div class="row">
         <div>
+            <div class="btn-group btn-group-sm pull-right" role="group" style="margin-top:3px;">
+                <label class="btn btn-default" onclick="handleCreateDir()">
+                    <span class="glyphicon glyphicon-plus" aria-hidden="true"></span> New Folder
+                </label>
+                <label class="btn btn-default" for="fileElem">
+                    <span class="glyphicon glyphicon-cloud-upload" aria-hidden="true"></span> Upload
+                </label>
+            </div>
+            <ol class="breadcrumb">
             {{ range $entry := .Breadcrumbs }}
-            <a href="{{ printpath $entry.Link }}">
+            <li><a href="{{ printpath $entry.Link }}">
                 {{ $entry.Name }}
-            </a>
+            </li></a>
             {{ end }}
-            <label class="button" for="fileElem">Upload</label>
+            </ol>
         </div>
     </div>
 
@@ -61,13 +109,18 @@
         <form class="upload-form">
             <input type="file" id="fileElem" multiple onchange="handleFiles(this.files)">
 
-            <table width="90%">
+            {{if .EmptyFolder}}
+            <div class="row add-files">
+                +
+            </div>
+            {{else}}
+            <table width="100%" class="table table-hover">
                 {{$path := .Path }}
                 {{ range $entry_index, $entry := .Entries }}
                 <tr>
                     <td>
                         {{if $entry.IsDirectory}}
-                        <img src="/seaweedfsstatic/images/folder.gif" width="20" height="23">
+                        <span class="glyphicon glyphicon-folder-open" aria-hidden="true"></span>&nbsp;
                         <a href="{{ printpath $path  "/" $entry.Name "/"}}" >
                         {{ $entry.Name }}
                         </a>
@@ -89,13 +142,29 @@
                         {{ $entry.Size | humanizeBytes }}&nbsp;
                         {{end}}
                     </td>
-                    <td nowrap>
+                    <td align="right" nowrap>
                         {{ $entry.Timestamp.Format "2006-01-02 15:04" }}
                     </td>
+                    <td style="width:75px">
+                        <div class="btn-group btn-group-xs pull-right operations" role="group">
+                            <label class="btn" onclick="handleRename('{{ $entry.Name }}', '{{ printpath $path "/" }}')">
+                                <span class="glyphicon glyphicon-edit" aria-hidden="true"></span>
+                            </label>
+                            {{if $entry.IsDirectory}}
+                            <label class="btn" onclick="handleDelete('{{ printpath $path  "/" $entry.Name "/"  }}')">
+                                <span class="glyphicon glyphicon-trash" aria-hidden="true"></span>
+                            </label>
+                            {{else}}
+                            <label class="btn" onclick="handleDelete('{{ printpath $path  "/" $entry.Name }}')">
+                                <span class="glyphicon glyphicon-trash" aria-hidden="true"></span>
+                            </label>
+                            {{end}}
+                        </div>
+                    </td>
                 </tr>
                 {{ end }}
-
             </table>
+            {{end}}
         </form>
     </div>
 
@@ -109,65 +178,177 @@
 
     <br/>
     <br/>
-
+    <div id="progress-area" class="footer" style="display: none;">
+    </div>
 </div>
 </body>
 <script type="text/javascript">
     // ************************ Drag and drop ***************** //
-    let dropArea = document.getElementById("drop-area")
+    let dropArea = document.getElementById("drop-area");
+    let progressArea = document.getElementById("progress-area");
 
 // Prevent default drag behaviors
     ;['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
-        dropArea.addEventListener(eventName, preventDefaults, false)
-        document.body.addEventListener(eventName, preventDefaults, false)
-    })
+        dropArea.addEventListener(eventName, preventDefaults, false);
+        document.body.addEventListener(eventName, preventDefaults, false);
+    });
 
 // Highlight drop area when item is dragged over it
     ;['dragenter', 'dragover'].forEach(eventName => {
-        dropArea.addEventListener(eventName, highlight, false)
-    })
+        dropArea.addEventListener(eventName, highlight, false);
+    });
 
     ;['dragleave', 'drop'].forEach(eventName => {
-        dropArea.addEventListener(eventName, unhighlight, false)
-    })
+        dropArea.addEventListener(eventName, unhighlight, false);
+    });
 
     // Handle dropped files
-    dropArea.addEventListener('drop', handleDrop, false)
+    dropArea.addEventListener('drop', handleDrop, false);
 
     function preventDefaults(e) {
-        e.preventDefault()
-        e.stopPropagation()
+        e.preventDefault();
+        e.stopPropagation();
     }
 
     function highlight(e) {
-        dropArea.classList.add('highlight')
+        dropArea.classList.add('highlight');
     }
 
     function unhighlight(e) {
-        dropArea.classList.remove('highlight')
+        dropArea.classList.remove('highlight');
     }
 
     function handleDrop(e) {
-        var dt = e.dataTransfer
-        var files = dt.files
+        var dt = e.dataTransfer;
+        var files = dt.files;
 
-        handleFiles(files)
+        handleFiles(files);
     }
 
+    var uploadList = {};
+
     function handleFiles(files) {
-        files = [...files]
-        files.forEach(uploadFile)
-        window.location.reload()
+        files = [...files];
+        files.forEach(startUpload);
+        renderProgress();
+        files.forEach(uploadFile);
+    }
+
+    function startUpload(file, i) {
+        uploadList[file.name] = {'name': file.name, 'percent': 0, 'finish': false};
+    }
+
+    function renderProgress() {
+        var values = Object.values(uploadList);
+        var html = '<table class="table">\n<tr><th>Uploading</th><\/tr>\n';
+        for (let i of values) {
+            var progressBarClass = 'progress-bar-striped active';
+            if (i.percent >= 100) {
+                progressBarClass = 'progress-bar-success';
+            }
+            html += '<tr>\n<td>\n';
+            html += '<div class="progress" style="margin-bottom: 2px;">\n';
+            html += '<div class="progress-bar ' + progressBarClass + '" role="progressbar" aria-valuenow="' + '100" aria-valuemin="0" aria-valuemax="100" style="width:' + i.percent + '%;">';
+            html += '<span style="margin-right: 10px;">' + i.name + '</span>' + i.percent + '%<\/div>';
+            html += '<\/div>\n<\/td>\n<\/tr>\n';
+        }
+        html += '<\/table>\n';
+        progressArea.innerHTML = html;
+        if (values.length > 0) {
+            progressArea.attributes.style.value = '';
+        }
+    }
+
+    function reportProgress(file, percent) {
+        var item = uploadList[file]
+        item.percent = percent;
+        renderProgress();
+    }
+
+    function finishUpload(file) {
+        uploadList[file]['finish'] = true;
+        renderProgress();
+        var allFinish = true;
+        for (let i of Object.values(uploadList)) {
+            if (!i.finish) {
+                allFinish = false;
+                break;
+            }
+        }
+        if (allFinish) {
+            console.log('All Finish');
+            window.location.reload();
+        }
     }
 
     function uploadFile(file, i) {
-        var url = window.location.href
-        var xhr = new XMLHttpRequest()
-        var formData = new FormData()
-        xhr.open('POST', url, false)
+        var url = window.location.href;
+        var xhr = new XMLHttpRequest();
+        var fileName = file.name;
+        xhr.upload.addEventListener('progress', function(e) {
+            if (e.lengthComputable) {
+                var percent = Math.ceil((e.loaded / e.total) * 100);
+                reportProgress(fileName, percent)
+            }
+        });
+        xhr.upload.addEventListener('loadend', function(e) {
+            finishUpload(fileName);
+        });
+        var formData = new FormData();
+        xhr.open('POST', url, true);
+        formData.append('file', file);
+        xhr.send(formData);
+    }
+
+    function handleCreateDir() {
+        var dirName = prompt('Folder Name:', '');
+        dirName = dirName.trim();
+        if (dirName == null || dirName == '') {
+            return;
+        }
+        var baseUrl = window.location.href;
+        if (!baseUrl.endsWith('/')) {
+            baseUrl += '/';
+        }
+        var url = baseUrl + dirName;
+        if (!url.endsWith('/')) {
+            url += '/';
+        }
+        var xhr = new XMLHttpRequest();
+        xhr.open('POST', url, false);
+        xhr.setRequestHeader('Content-Type', '');
+        xhr.send();
+        window.location.reload();
+    }
+
+    function handleRename(originName, basePath) {
+        var newName = prompt('New Name:', originName);
+        if (newName == null || newName == '') {
+            return;
+        }
+        var url = basePath + newName;
+        var originPath = basePath + originName;
+        url += '?mv.from=' + originPath;
+        var xhr = new XMLHttpRequest();
+        xhr.open('POST', url, false);
+        xhr.setRequestHeader('Content-Type', '');
+        xhr.send();
+        window.location.reload();
+    }
+
+    function handleDelete(path) {
+        if (!confirm('Are you sure to delete ' + path + '?')) {
+            return;
+        }
+        var url = path;
+        if (url.endsWith('/')) {
+            url += '?recursive=true';
+        }
 
-        formData.append('file', file)
-        xhr.send(formData)
+        var xhr = new XMLHttpRequest();
+        xhr.open('DELETE', url, false);
+        xhr.send();
+        window.location.reload();
     }
 </script>
 </html>
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 50fcc0d62..83abdaaad 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -113,6 +113,9 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 		}
 
 		if len(heartbeat.Volumes) > 0 || heartbeat.HasNoVolumes {
+			dcName, rackName := ms.Topo.Configuration.Locate(heartbeat.Ip, heartbeat.DataCenter, heartbeat.Rack)
+			ms.Topo.DataNodeRegistration(dcName, rackName, dn)
+
 			// process heartbeat.Volumes
 			stats.MasterReceivedHeartbeatCounter.WithLabelValues("Volumes").Inc()
 			newVolumes, deletedVolumes := ms.Topo.SyncDataNodeRegistration(heartbeat.Volumes, dn)
@@ -133,13 +136,13 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			ms.Topo.IncrementalSyncDataNodeEcShards(heartbeat.NewEcShards, heartbeat.DeletedEcShards, dn)
 
 			for _, s := range heartbeat.NewEcShards {
-				message.NewVids = append(message.NewVids, s.Id)
+				message.NewEcVids = append(message.NewEcVids, s.Id)
 			}
 			for _, s := range heartbeat.DeletedEcShards {
-				if dn.HasVolumesById(needle.VolumeId(s.Id)) {
+				if dn.HasEcShards(needle.VolumeId(s.Id)) {
 					continue
 				}
-				message.DeletedVids = append(message.DeletedVids, s.Id)
+				message.DeletedEcVids = append(message.DeletedEcVids, s.Id)
 			}
 
 		}
@@ -151,17 +154,17 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 			// broadcast the ec vid changes to master clients
 			for _, s := range newShards {
-				message.NewVids = append(message.NewVids, uint32(s.VolumeId))
+				message.NewEcVids = append(message.NewEcVids, uint32(s.VolumeId))
 			}
 			for _, s := range deletedShards {
 				if dn.HasVolumesById(s.VolumeId) {
 					continue
 				}
-				message.DeletedVids = append(message.DeletedVids, uint32(s.VolumeId))
+				message.DeletedEcVids = append(message.DeletedEcVids, uint32(s.VolumeId))
 			}
 
 		}
-		if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 {
+		if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 || len(message.NewEcVids) > 0 || len(message.DeletedEcVids) > 0 {
 			ms.broadcastToClients(&master_pb.KeepConnectedResponse{VolumeLocation: message})
 		}
 
diff --git a/weed/server/master_grpc_server_admin.go b/weed/server/master_grpc_server_admin.go
index 983606476..1f37e979a 100644
--- a/weed/server/master_grpc_server_admin.go
+++ b/weed/server/master_grpc_server_admin.go
@@ -3,7 +3,11 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"math/rand"
 	"sync"
 	"time"
@@ -142,3 +146,41 @@ func (ms *MasterServer) ReleaseAdminToken(ctx context.Context, req *master_pb.Re
 	}
 	return resp, nil
 }
+
+func (ms *MasterServer) Ping(ctx context.Context, req *master_pb.PingRequest) (resp *master_pb.PingResponse, pingErr error) {
+	resp = &master_pb.PingResponse{
+		StartTimeNs: time.Now().UnixNano(),
+	}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			pingResp, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			pingResp, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			pingResp, err := client.Ping(ctx, &master_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	resp.StopTimeNs = time.Now().UnixNano()
+	return
+}
diff --git a/weed/server/master_grpc_server_raft.go b/weed/server/master_grpc_server_raft.go
new file mode 100644
index 000000000..37491b3df
--- /dev/null
+++ b/weed/server/master_grpc_server_raft.go
@@ -0,0 +1,66 @@
+package weed_server
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/hashicorp/raft"
+)
+
+func (ms *MasterServer) RaftListClusterServers(ctx context.Context, req *master_pb.RaftListClusterServersRequest) (*master_pb.RaftListClusterServersResponse, error) {
+	resp := &master_pb.RaftListClusterServersResponse{}
+
+	servers := ms.Topo.HashicorpRaft.GetConfiguration().Configuration().Servers
+
+	for _, server := range servers {
+		resp.ClusterServers = append(resp.ClusterServers, &master_pb.RaftListClusterServersResponse_ClusterServers{
+			Id:       string(server.ID),
+			Address:  string(server.Address),
+			Suffrage: server.Suffrage.String(),
+		})
+	}
+	return resp, nil
+}
+
+func (ms *MasterServer) RaftAddServer(ctx context.Context, req *master_pb.RaftAddServerRequest) (*master_pb.RaftAddServerResponse, error) {
+	resp := &master_pb.RaftAddServerResponse{}
+	if ms.Topo.HashicorpRaft.State() != raft.Leader {
+		return nil, fmt.Errorf("raft add server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
+	}
+
+	var idxFuture raft.IndexFuture
+	if req.Voter {
+		idxFuture = ms.Topo.HashicorpRaft.AddVoter(raft.ServerID(req.Id), raft.ServerAddress(req.Address), 0, 0)
+	} else {
+		idxFuture = ms.Topo.HashicorpRaft.AddNonvoter(raft.ServerID(req.Id), raft.ServerAddress(req.Address), 0, 0)
+	}
+
+	if err := idxFuture.Error(); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
+func (ms *MasterServer) RaftRemoveServer(ctx context.Context, req *master_pb.RaftRemoveServerRequest) (*master_pb.RaftRemoveServerResponse, error) {
+	resp := &master_pb.RaftRemoveServerResponse{}
+
+	if ms.Topo.HashicorpRaft.State() != raft.Leader {
+		return nil, fmt.Errorf("raft remove server %s failed: %s is no current leader", req.Id, ms.Topo.HashicorpRaft.String())
+	}
+
+	if !req.Force {
+		ms.clientChansLock.RLock()
+		_, ok := ms.clientChans[fmt.Sprintf("%s@%s", cluster.MasterType, req.Id)]
+		ms.clientChansLock.RUnlock()
+		if ok {
+			return resp, fmt.Errorf("raft remove server %s failed: client connection to master exists", req.Id)
+		}
+	}
+
+	idxFuture := ms.Topo.HashicorpRaft.RemoveServer(raft.ServerID(req.Id), 0, 0)
+	if err := idxFuture.Error(); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 9389bceb8..bc92dd332 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -268,7 +268,7 @@ func (ms *MasterServer) VacuumVolume(ctx context.Context, req *master_pb.VacuumV
 
 	resp := &master_pb.VacuumVolumeResponse{}
 
-	ms.Topo.Vacuum(ms.grpcDialOption, float64(req.GarbageThreshold), ms.preallocateSize)
+	ms.Topo.Vacuum(ms.grpcDialOption, float64(req.GarbageThreshold), req.VolumeId, req.Collection, ms.preallocateSize)
 
 	return resp, nil
 }
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 671432d5c..9f29d4ba7 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -1,6 +1,7 @@
 package weed_server
 
 import (
+	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"net/http"
@@ -17,6 +18,7 @@ import (
 
 	"github.com/chrislusf/raft"
 	"github.com/gorilla/mux"
+	hashicorpRaft "github.com/hashicorp/raft"
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -30,8 +32,9 @@ import (
 )
 
 const (
-	SequencerType        = "master.sequencer.type"
-	SequencerSnowflakeId = "master.sequencer.sequencer_snowflake_id"
+	SequencerType         = "master.sequencer.type"
+	SequencerSnowflakeId  = "master.sequencer.sequencer_snowflake_id"
+	RaftServerRemovalTime = 72 * time.Minute
 )
 
 type MasterOption struct {
@@ -62,6 +65,9 @@ type MasterServer struct {
 
 	boundedLeaderChan chan int
 
+	onPeerUpdatDoneCn      chan string
+	onPeerUpdatDoneCnExist bool
+
 	// notifying clients
 	clientChansLock sync.RWMutex
 	clientChans     map[string]chan *master_pb.KeepConnectedResponse
@@ -75,7 +81,7 @@ type MasterServer struct {
 	Cluster *cluster.Cluster
 }
 
-func NewMasterServer(r *mux.Router, option *MasterOption, peers []pb.ServerAddress) *MasterServer {
+func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.ServerAddress) *MasterServer {
 
 	v := util.GetViper()
 	signingKey := v.GetString("jwt.signing.key")
@@ -112,6 +118,9 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []pb.ServerAddre
 		Cluster:         cluster.NewCluster(),
 	}
 	ms.boundedLeaderChan = make(chan int, 16)
+	ms.onPeerUpdatDoneCn = make(chan string)
+
+	ms.MasterClient.OnPeerUpdate = ms.OnPeerUpdate
 
 	seq := ms.createSequencer(option)
 	if nil == seq {
@@ -160,19 +169,41 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []pb.ServerAddre
 }
 
 func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
-	ms.Topo.RaftServer = raftServer.raftServer
-	ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) {
-		glog.V(0).Infof("leader change event: %+v => %+v", e.PrevValue(), e.Value())
-		stats.MasterLeaderChangeCounter.WithLabelValues(fmt.Sprintf("%+v", e.Value())).Inc()
-		if ms.Topo.RaftServer.Leader() != "" {
-			glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.")
-		}
-	})
+	var raftServerName string
+	if raftServer.raftServer != nil {
+		ms.Topo.RaftServer = raftServer.raftServer
+		ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) {
+			glog.V(0).Infof("leader change event: %+v => %+v", e.PrevValue(), e.Value())
+			stats.MasterLeaderChangeCounter.WithLabelValues(fmt.Sprintf("%+v", e.Value())).Inc()
+			if ms.Topo.RaftServer.Leader() != "" {
+				glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.")
+			}
+		})
+		raftServerName = ms.Topo.RaftServer.Name()
+	} else if raftServer.RaftHashicorp != nil {
+		ms.Topo.HashicorpRaft = raftServer.RaftHashicorp
+		leaderCh := raftServer.RaftHashicorp.LeaderCh()
+		prevLeader := ms.Topo.HashicorpRaft.Leader()
+		go func() {
+			for {
+				select {
+				case isLeader := <-leaderCh:
+					leader := ms.Topo.HashicorpRaft.Leader()
+					glog.V(0).Infof("is leader %+v change event: %+v => %+v", isLeader, prevLeader, leader)
+					stats.MasterLeaderChangeCounter.WithLabelValues(fmt.Sprintf("%+v", leader)).Inc()
+					prevLeader = leader
+				}
+			}
+		}()
+		raftServerName = ms.Topo.HashicorpRaft.String()
+	}
 	if ms.Topo.IsLeader() {
-		glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!")
+		glog.V(0).Infoln("[", raftServerName, "]", "I am the leader!")
 	} else {
-		if ms.Topo.RaftServer.Leader() != "" {
+		if ms.Topo.RaftServer != nil && ms.Topo.RaftServer.Leader() != "" {
 			glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "is the leader.")
+		} else if ms.Topo.HashicorpRaft != nil && ms.Topo.HashicorpRaft.Leader() != "" {
+			glog.V(0).Infoln("[", ms.Topo.HashicorpRaft.String(), "]", ms.Topo.HashicorpRaft.Leader(), "is the leader.")
 		}
 	}
 }
@@ -181,31 +212,38 @@ func (ms *MasterServer) proxyToLeader(f http.HandlerFunc) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if ms.Topo.IsLeader() {
 			f(w, r)
-		} else if ms.Topo.RaftServer != nil && ms.Topo.RaftServer.Leader() != "" {
-			ms.boundedLeaderChan <- 1
-			defer func() { <-ms.boundedLeaderChan }()
-			targetUrl, err := url.Parse("http://" + ms.Topo.RaftServer.Leader())
-			if err != nil {
-				writeJsonError(w, r, http.StatusInternalServerError,
-					fmt.Errorf("Leader URL http://%s Parse Error: %v", ms.Topo.RaftServer.Leader(), err))
-				return
-			}
-			glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader())
-			proxy := httputil.NewSingleHostReverseProxy(targetUrl)
-			director := proxy.Director
-			proxy.Director = func(req *http.Request) {
-				actualHost, err := security.GetActualRemoteHost(req)
-				if err == nil {
-					req.Header.Set("HTTP_X_FORWARDED_FOR", actualHost)
-				}
-				director(req)
-			}
-			proxy.Transport = util.Transport
-			proxy.ServeHTTP(w, r)
-		} else {
-			// handle requests locally
+			return
+		}
+		var raftServerLeader string
+		if ms.Topo.RaftServer != nil && ms.Topo.RaftServer.Leader() != "" {
+			raftServerLeader = ms.Topo.RaftServer.Leader()
+		} else if ms.Topo.HashicorpRaft != nil && ms.Topo.HashicorpRaft.Leader() != "" {
+			raftServerLeader = string(ms.Topo.HashicorpRaft.Leader())
+		}
+		if raftServerLeader == "" {
 			f(w, r)
+			return
+		}
+		ms.boundedLeaderChan <- 1
+		defer func() { <-ms.boundedLeaderChan }()
+		targetUrl, err := url.Parse("http://" + raftServerLeader)
+		if err != nil {
+			writeJsonError(w, r, http.StatusInternalServerError,
+				fmt.Errorf("Leader URL http://%s Parse Error: %v", raftServerLeader, err))
+			return
+		}
+		glog.V(4).Infoln("proxying to leader", raftServerLeader)
+		proxy := httputil.NewSingleHostReverseProxy(targetUrl)
+		director := proxy.Director
+		proxy.Director = func(req *http.Request) {
+			actualHost, err := security.GetActualRemoteHost(req)
+			if err == nil {
+				req.Header.Set("HTTP_X_FORWARDED_FOR", actualHost)
+			}
+			director(req)
 		}
+		proxy.Transport = util.Transport
+		proxy.ServeHTTP(w, r)
 	}
 }
 
@@ -301,3 +339,57 @@ func (ms *MasterServer) createSequencer(option *MasterOption) sequence.Sequencer
 	}
 	return seq
 }
+
+func (ms *MasterServer) OnPeerUpdate(update *master_pb.ClusterNodeUpdate) {
+	if update.NodeType != cluster.MasterType || ms.Topo.HashicorpRaft == nil {
+		return
+	}
+	glog.V(4).Infof("OnPeerUpdate: %+v", update)
+
+	peerAddress := pb.ServerAddress(update.Address)
+	peerName := string(peerAddress)
+	isLeader := ms.Topo.HashicorpRaft.State() == hashicorpRaft.Leader
+	if update.IsAdd {
+		if isLeader {
+			raftServerFound := false
+			for _, server := range ms.Topo.HashicorpRaft.GetConfiguration().Configuration().Servers {
+				if string(server.ID) == peerName {
+					raftServerFound = true
+				}
+			}
+			if !raftServerFound {
+				glog.V(0).Infof("adding new raft server: %s", peerName)
+				ms.Topo.HashicorpRaft.AddVoter(
+					hashicorpRaft.ServerID(peerName),
+					hashicorpRaft.ServerAddress(peerAddress.ToGrpcAddress()), 0, 0)
+			}
+		}
+		if ms.onPeerUpdatDoneCnExist {
+			ms.onPeerUpdatDoneCn <- peerName
+		}
+	} else if isLeader {
+		go func(peerName string) {
+			for {
+				select {
+				case <-time.After(RaftServerRemovalTime):
+					err := ms.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+						_, err := client.RaftRemoveServer(context.Background(), &master_pb.RaftRemoveServerRequest{
+							Id:    peerName,
+							Force: false,
+						})
+						return err
+					})
+					if err != nil {
+						glog.Warningf("failed to removing old raft server %s: %v", peerName, err)
+					}
+					return
+				case peerDone := <-ms.onPeerUpdatDoneCn:
+					if peerName == peerDone {
+						return
+					}
+				}
+			}
+		}(peerName)
+		ms.onPeerUpdatDoneCnExist = true
+	}
+}
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index 72d4e20d7..ade750ccc 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -64,7 +64,7 @@ func (ms *MasterServer) volumeVacuumHandler(w http.ResponseWriter, r *http.Reque
 		}
 	}
 	// glog.Infoln("garbageThreshold =", gcThreshold)
-	ms.Topo.Vacuum(ms.grpcDialOption, gcThreshold, ms.preallocateSize)
+	ms.Topo.Vacuum(ms.grpcDialOption, gcThreshold, 0, "", ms.preallocateSize)
 	ms.dirStatusHandler(w, r)
 }
 
diff --git a/weed/server/master_server_handlers_ui.go b/weed/server/master_server_handlers_ui.go
index 015bfbd00..d8260d8d2 100644
--- a/weed/server/master_server_handlers_ui.go
+++ b/weed/server/master_server_handlers_ui.go
@@ -5,6 +5,8 @@ import (
 	"time"
 
 	"github.com/chrislusf/raft"
+	hashicorpRaft "github.com/hashicorp/raft"
+
 	ui "github.com/chrislusf/seaweedfs/weed/server/master_ui"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -13,20 +15,40 @@ import (
 func (ms *MasterServer) uiStatusHandler(w http.ResponseWriter, r *http.Request) {
 	infos := make(map[string]interface{})
 	infos["Up Time"] = time.Now().Sub(startTime).String()
-	args := struct {
-		Version           string
-		Topology          interface{}
-		RaftServer        raft.Server
-		Stats             map[string]interface{}
-		Counters          *stats.ServerStats
-		VolumeSizeLimitMB uint32
-	}{
-		util.Version(),
-		ms.Topo.ToMap(),
-		ms.Topo.RaftServer,
-		infos,
-		serverStats,
-		ms.option.VolumeSizeLimitMB,
+	infos["Max Volume Id"] = ms.Topo.GetMaxVolumeId()
+	if ms.Topo.RaftServer != nil {
+		args := struct {
+			Version           string
+			Topology          interface{}
+			RaftServer        raft.Server
+			Stats             map[string]interface{}
+			Counters          *stats.ServerStats
+			VolumeSizeLimitMB uint32
+		}{
+			util.Version(),
+			ms.Topo.ToMap(),
+			ms.Topo.RaftServer,
+			infos,
+			serverStats,
+			ms.option.VolumeSizeLimitMB,
+		}
+		ui.StatusTpl.Execute(w, args)
+	} else if ms.Topo.HashicorpRaft != nil {
+		args := struct {
+			Version           string
+			Topology          interface{}
+			RaftServer        *hashicorpRaft.Raft
+			Stats             map[string]interface{}
+			Counters          *stats.ServerStats
+			VolumeSizeLimitMB uint32
+		}{
+			util.Version(),
+			ms.Topo.ToMap(),
+			ms.Topo.HashicorpRaft,
+			infos,
+			serverStats,
+			ms.option.VolumeSizeLimitMB,
+		}
+		ui.StatusNewRaftTpl.Execute(w, args)
 	}
-	ui.StatusTpl.Execute(w, args)
 }
diff --git a/weed/server/master_ui/masterNewRaft.html b/weed/server/master_ui/masterNewRaft.html
new file mode 100644
index 000000000..32afdceac
--- /dev/null
+++ b/weed/server/master_ui/masterNewRaft.html
@@ -0,0 +1,121 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>SeaweedFS {{ .Version }}</title>
+    <link rel="stylesheet" href="/seaweedfsstatic/bootstrap/3.3.1/css/bootstrap.min.css">
+</head>
+<body>
+<div class="container">
+    <div class="page-header">
+        <h1>
+            <a href="https://github.com/chrislusf/seaweedfs"><img src="/seaweedfsstatic/seaweed50x50.png"></img></a>
+            SeaweedFS <small>{{ .Version }}</small>
+        </h1>
+    </div>
+
+    <div class="row">
+        <div class="col-sm-6">
+            <h2>Cluster status</h2>
+            <table class="table table-condensed table-striped">
+                <tbody>
+                <tr>
+                    <th>Volume Size Limit</th>
+                    <td>{{ .VolumeSizeLimitMB }}MB</td>
+                </tr>
+                <tr>
+                    <th>Free</th>
+                    <td>{{ .Topology.Free }}</td>
+                </tr>
+                <tr>
+                    <th>Max</th>
+                    <td>{{ .Topology.Max }}</td>
+                </tr>
+                {{ with .RaftServer }}
+                <tr>
+                    <th>Leader</th>
+                    <td><a href="http://{{ .Leader }}">{{ .Leader }}</a></td>
+                </tr>
+                <tr>
+                    <th>Other Masters</th>
+                    <td class="col-sm-5">
+                        <ul class="list-unstyled">
+                            {{ range $k, $p := .GetConfiguration.Configuration.Servers }}
+                            <li><a href="http://{{ $p.ID }}/ui/index.html">{{ $p.ID }}</a></li>
+                            {{ end }}
+                        </ul>
+                    </td>
+                </tr>
+                {{ end }}
+                </tbody>
+            </table>
+        </div>
+
+        <div class="col-sm-6">
+            <h2>System Stats</h2>
+            <table class="table table-condensed table-striped">
+                <tr>
+                    <th>Concurrent Connections</th>
+                    <td>{{ .Counters.Connections.WeekCounter.Sum }}</td>
+                </tr>
+                {{ range $key, $val := .Stats }}
+                <tr>
+                    <th>{{ $key }}</th>
+                    <td>{{ $val }}</td>
+                </tr>
+                {{ end }}
+            </table>
+            <h2>Raft Stats</h2>
+            <table class="table table-condensed table-striped">
+                <tr>
+                    <th>applied_index</th>
+                    <td>{{ .RaftServer.Stats.applied_index }}</td>
+                </tr>
+                <tr>
+                    <th>last_log_term</th>
+                    <td>{{ .RaftServer.Stats.last_log_term }}</td>
+                </tr>
+            </table>
+        </div>
+    </div>
+
+    <div class="row">
+        <h2>Topology</h2>
+        <table class="table table-striped">
+            <thead>
+            <tr>
+                <th>Data Center</th>
+                <th>Rack</th>
+                <th>RemoteAddr</th>
+                <th>#Volumes</th>
+                <th>Volume Ids</th>
+                <th>#ErasureCodingShards</th>
+                <th>Max</th>
+            </tr>
+            </thead>
+            <tbody>
+            {{ range $dc_index, $dc := .Topology.DataCenters }}
+            {{ range $rack_index, $rack := $dc.Racks }}
+            {{ range $dn_index, $dn := $rack.DataNodes }}
+            <tr>
+                <td><code>{{ $dc.Id }}</code></td>
+                <td>{{ $rack.Id }}</td>
+                <td><a href="http://{{ $dn.Url }}/ui/index.html">{{ $dn.Url }}</a>
+                    {{ if ne $dn.PublicUrl $dn.Url }}
+                    / <a href="http://{{ $dn.PublicUrl }}/ui/index.html">{{ $dn.PublicUrl }}</a>
+                    {{ end }}
+                </td>
+                <td>{{ $dn.Volumes }}</td>
+                <td>{{ $dn.VolumeIds}}</td>
+                <td>{{ $dn.EcShards }}</td>
+                <td>{{ $dn.Max }}</td>
+            </tr>
+            {{ end }}
+            {{ end }}
+            {{ end }}
+            </tbody>
+        </table>
+    </div>
+
+</div>
+</body>
+</html>
diff --git a/weed/server/master_ui/templates.go b/weed/server/master_ui/templates.go
index 415022b97..a6dcc57d7 100644
--- a/weed/server/master_ui/templates.go
+++ b/weed/server/master_ui/templates.go
@@ -8,4 +8,8 @@ import (
 //go:embed master.html
 var masterHtml string
 
+//go:embed masterNewRaft.html
+var masterNewRaftHtml string
+
 var StatusTpl = template.Must(template.New("status").Parse(masterHtml))
+var StatusNewRaftTpl = template.Must(template.New("status").Parse(masterNewRaftHtml))
diff --git a/weed/server/raft_hashicorp.go b/weed/server/raft_hashicorp.go
new file mode 100644
index 000000000..cc6578bf5
--- /dev/null
+++ b/weed/server/raft_hashicorp.go
@@ -0,0 +1,183 @@
+package weed_server
+
+// https://yusufs.medium.com/creating-distributed-kv-database-by-implementing-raft-consensus-using-golang-d0884eef2e28
+// https://github.com/Jille/raft-grpc-example/blob/cd5bcab0218f008e044fbeee4facdd01b06018ad/application.go#L18
+
+import (
+	"fmt"
+	transport "github.com/Jille/raft-grpc-transport"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/hashicorp/raft"
+	boltdb "github.com/hashicorp/raft-boltdb"
+	"google.golang.org/grpc"
+	"math/rand"
+	"os"
+	"path"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+)
+
+const (
+	ldbFile            = "logs.dat"
+	sdbFile            = "stable.dat"
+	updatePeersTimeout = 15 * time.Minute
+)
+
+func getPeerIdx(self pb.ServerAddress, mapPeers map[string]pb.ServerAddress) int {
+	peers := make([]pb.ServerAddress, 0, len(mapPeers))
+	for _, peer := range mapPeers {
+		peers = append(peers, peer)
+	}
+	sort.Slice(peers, func(i, j int) bool {
+		return strings.Compare(string(peers[i]), string(peers[j])) < 0
+	})
+	for i, peer := range peers {
+		if string(peer) == string(self) {
+			return i
+		}
+	}
+	return -1
+}
+
+func (s *RaftServer) AddPeersConfiguration() (cfg raft.Configuration) {
+	for _, peer := range s.peers {
+		cfg.Servers = append(cfg.Servers, raft.Server{
+			Suffrage: raft.Voter,
+			ID:       raft.ServerID(peer),
+			Address:  raft.ServerAddress(peer.ToGrpcAddress()),
+		})
+	}
+	return cfg
+}
+
+func (s *RaftServer) UpdatePeers() {
+	for {
+		select {
+		case isLeader := <-s.RaftHashicorp.LeaderCh():
+			if isLeader {
+				peerLeader := string(s.serverAddr)
+				existsPeerName := make(map[string]bool)
+				for _, server := range s.RaftHashicorp.GetConfiguration().Configuration().Servers {
+					if string(server.ID) == peerLeader {
+						continue
+					}
+					existsPeerName[string(server.ID)] = true
+				}
+				for _, peer := range s.peers {
+					peerName := string(peer)
+					if peerName == peerLeader || existsPeerName[peerName] {
+						continue
+					}
+					glog.V(0).Infof("adding new peer: %s", peerName)
+					s.RaftHashicorp.AddVoter(
+						raft.ServerID(peerName), raft.ServerAddress(peer.ToGrpcAddress()), 0, 0)
+				}
+				for peer, _ := range existsPeerName {
+					if _, found := s.peers[peer]; !found {
+						glog.V(0).Infof("removing old peer: %s", peer)
+						s.RaftHashicorp.RemoveServer(raft.ServerID(peer), 0, 0)
+					}
+				}
+				if _, found := s.peers[peerLeader]; !found {
+					glog.V(0).Infof("removing old leader peer: %s", peerLeader)
+					s.RaftHashicorp.RemoveServer(raft.ServerID(peerLeader), 0, 0)
+				}
+			}
+			return
+		case <-time.After(updatePeersTimeout):
+			return
+		}
+	}
+}
+
+func NewHashicorpRaftServer(option *RaftServerOption) (*RaftServer, error) {
+	s := &RaftServer{
+		peers:      option.Peers,
+		serverAddr: option.ServerAddr,
+		dataDir:    option.DataDir,
+		topo:       option.Topo,
+	}
+
+	c := raft.DefaultConfig()
+	c.LocalID = raft.ServerID(s.serverAddr) // TODO maybee the IP:port address will change
+	c.HeartbeatTimeout = time.Duration(float64(option.HeartbeatInterval) * (rand.Float64()*0.25 + 1))
+	c.ElectionTimeout = option.ElectionTimeout
+	if c.LeaderLeaseTimeout > c.HeartbeatTimeout {
+		c.LeaderLeaseTimeout = c.HeartbeatTimeout
+	}
+	if glog.V(4) {
+		c.LogLevel = "Debug"
+	} else if glog.V(2) {
+		c.LogLevel = "Info"
+	} else if glog.V(1) {
+		c.LogLevel = "Warn"
+	} else if glog.V(0) {
+		c.LogLevel = "Error"
+	}
+
+	if option.RaftBootstrap {
+		os.RemoveAll(path.Join(s.dataDir, ldbFile))
+		os.RemoveAll(path.Join(s.dataDir, sdbFile))
+		os.RemoveAll(path.Join(s.dataDir, "snapshot"))
+	}
+	baseDir := s.dataDir
+
+	ldb, err := boltdb.NewBoltStore(filepath.Join(baseDir, ldbFile))
+	if err != nil {
+		return nil, fmt.Errorf(`boltdb.NewBoltStore(%q): %v`, filepath.Join(baseDir, "logs.dat"), err)
+	}
+
+	sdb, err := boltdb.NewBoltStore(filepath.Join(baseDir, sdbFile))
+	if err != nil {
+		return nil, fmt.Errorf(`boltdb.NewBoltStore(%q): %v`, filepath.Join(baseDir, "stable.dat"), err)
+	}
+
+	fss, err := raft.NewFileSnapshotStore(baseDir, 3, os.Stderr)
+	if err != nil {
+		return nil, fmt.Errorf(`raft.NewFileSnapshotStore(%q, ...): %v`, baseDir, err)
+	}
+
+	s.TransportManager = transport.New(raft.ServerAddress(s.serverAddr), []grpc.DialOption{option.GrpcDialOption})
+
+	stateMachine := StateMachine{topo: option.Topo}
+	s.RaftHashicorp, err = raft.NewRaft(c, &stateMachine, ldb, sdb, fss, s.TransportManager.Transport())
+	if err != nil {
+		return nil, fmt.Errorf("raft.NewRaft: %v", err)
+	}
+	if option.RaftBootstrap || len(s.RaftHashicorp.GetConfiguration().Configuration().Servers) == 0 {
+		cfg := s.AddPeersConfiguration()
+		// Need to get lock, in case all servers do this at the same time.
+		peerIdx := getPeerIdx(s.serverAddr, s.peers)
+		timeSpeep := time.Duration(float64(c.LeaderLeaseTimeout) * (rand.Float64()*0.25 + 1) * float64(peerIdx))
+		glog.V(0).Infof("Bootstrapping idx: %d sleep: %v new cluster: %+v", peerIdx, timeSpeep, cfg)
+		time.Sleep(timeSpeep)
+		f := s.RaftHashicorp.BootstrapCluster(cfg)
+		if err := f.Error(); err != nil {
+			return nil, fmt.Errorf("raft.Raft.BootstrapCluster: %v", err)
+		}
+	} else {
+		go s.UpdatePeers()
+	}
+
+	ticker := time.NewTicker(c.HeartbeatTimeout * 10)
+	if glog.V(4) {
+		go func() {
+			for {
+				select {
+				case <-ticker.C:
+					cfuture := s.RaftHashicorp.GetConfiguration()
+					if err = cfuture.Error(); err != nil {
+						glog.Fatalf("error getting config: %s", err)
+					}
+					configuration := cfuture.Configuration()
+					glog.V(4).Infof("Showing peers known by %s:\n%+v", s.RaftHashicorp.String(), configuration.Servers)
+				}
+			}
+		}()
+	}
+
+	return s, nil
+}
diff --git a/weed/server/raft_server.go b/weed/server/raft_server.go
index f22b7c45d..8c372f0cc 100644
--- a/weed/server/raft_server.go
+++ b/weed/server/raft_server.go
@@ -2,11 +2,12 @@ package weed_server
 
 import (
 	"encoding/json"
+	transport "github.com/Jille/raft-grpc-transport"
+	"io"
+	"io/ioutil"
 	"math/rand"
 	"os"
 	"path"
-	"sort"
-	"strings"
 	"time"
 
 	"google.golang.org/grpc"
@@ -14,6 +15,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 
 	"github.com/chrislusf/raft"
+	hashicorpRaft "github.com/hashicorp/raft"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/topology"
@@ -21,21 +23,24 @@ import (
 
 type RaftServerOption struct {
 	GrpcDialOption    grpc.DialOption
-	Peers             []pb.ServerAddress
+	Peers             map[string]pb.ServerAddress
 	ServerAddr        pb.ServerAddress
 	DataDir           string
 	Topo              *topology.Topology
 	RaftResumeState   bool
 	HeartbeatInterval time.Duration
 	ElectionTimeout   time.Duration
+	RaftBootstrap     bool
 }
 
 type RaftServer struct {
-	peers      []pb.ServerAddress // initial peers to join with
-	raftServer raft.Server
-	dataDir    string
-	serverAddr pb.ServerAddress
-	topo       *topology.Topology
+	peers            map[string]pb.ServerAddress // initial peers to join with
+	raftServer       raft.Server
+	RaftHashicorp    *hashicorpRaft.Raft
+	TransportManager *transport.Manager
+	dataDir          string
+	serverAddr       pb.ServerAddress
+	topo             *topology.Topology
 	*raft.GrpcServer
 }
 
@@ -44,6 +49,8 @@ type StateMachine struct {
 	topo *topology.Topology
 }
 
+var _ hashicorpRaft.FSM = &StateMachine{}
+
 func (s StateMachine) Save() ([]byte, error) {
 	state := topology.MaxVolumeIdCommand{
 		MaxVolumeId: s.topo.GetMaxVolumeId(),
@@ -63,6 +70,36 @@ func (s StateMachine) Recovery(data []byte) error {
 	return nil
 }
 
+func (s *StateMachine) Apply(l *hashicorpRaft.Log) interface{} {
+	before := s.topo.GetMaxVolumeId()
+	state := topology.MaxVolumeIdCommand{}
+	err := json.Unmarshal(l.Data, &state)
+	if err != nil {
+		return err
+	}
+	s.topo.UpAdjustMaxVolumeId(state.MaxVolumeId)
+
+	glog.V(1).Infoln("max volume id", before, "==>", s.topo.GetMaxVolumeId())
+	return nil
+}
+
+func (s *StateMachine) Snapshot() (hashicorpRaft.FSMSnapshot, error) {
+	return &topology.MaxVolumeIdCommand{
+		MaxVolumeId: s.topo.GetMaxVolumeId(),
+	}, nil
+}
+
+func (s *StateMachine) Restore(r io.ReadCloser) error {
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return err
+	}
+	if err := s.Recovery(b); err != nil {
+		return err
+	}
+	return nil
+}
+
 func NewRaftServer(option *RaftServerOption) (*RaftServer, error) {
 	s := &RaftServer{
 		peers:      option.Peers,
@@ -88,7 +125,7 @@ func NewRaftServer(option *RaftServerOption) (*RaftServer, error) {
 		os.RemoveAll(path.Join(s.dataDir, "conf"))
 		os.RemoveAll(path.Join(s.dataDir, "snapshot"))
 	}
-	if err := os.MkdirAll(path.Join(s.dataDir, "snapshot"), 0600); err != nil {
+	if err := os.MkdirAll(path.Join(s.dataDir, "snapshot"), 0700); err != nil {
 		return nil, err
 	}
 
@@ -108,23 +145,15 @@ func NewRaftServer(option *RaftServerOption) (*RaftServer, error) {
 		return nil, err
 	}
 
-	for _, peer := range s.peers {
-		if err := s.raftServer.AddPeer(string(peer), peer.ToGrpcAddress()); err != nil {
+	for name, peer := range s.peers {
+		if err := s.raftServer.AddPeer(name, peer.ToGrpcAddress()); err != nil {
 			return nil, err
 		}
 	}
 
 	// Remove deleted peers
 	for existsPeerName := range s.raftServer.Peers() {
-		exists := false
-		var existingPeer pb.ServerAddress
-		for _, peer := range s.peers {
-			if peer.String() == existsPeerName {
-				exists, existingPeer = true, peer
-				break
-			}
-		}
-		if !exists {
+		if existingPeer, found := s.peers[existsPeerName]; !found {
 			if err := s.raftServer.RemovePeer(existsPeerName); err != nil {
 				glog.V(0).Infoln(err)
 				return nil, err
@@ -136,36 +165,26 @@ func NewRaftServer(option *RaftServerOption) (*RaftServer, error) {
 
 	s.GrpcServer = raft.NewGrpcServer(s.raftServer)
 
-	if s.raftServer.IsLogEmpty() && isTheFirstOne(option.ServerAddr, s.peers) {
-		// Initialize the server by joining itself.
-		// s.DoJoinCommand()
-	}
-
 	glog.V(0).Infof("current cluster leader: %v", s.raftServer.Leader())
 
 	return s, nil
 }
 
 func (s *RaftServer) Peers() (members []string) {
-	peers := s.raftServer.Peers()
-
-	for _, p := range peers {
-		members = append(members, p.Name)
+	if s.raftServer != nil {
+		peers := s.raftServer.Peers()
+		for _, p := range peers {
+			members = append(members, p.Name)
+		}
+	} else if s.RaftHashicorp != nil {
+		cfg := s.RaftHashicorp.GetConfiguration()
+		for _, p := range cfg.Configuration().Servers {
+			members = append(members, string(p.ID))
+		}
 	}
-
 	return
 }
 
-func isTheFirstOne(self pb.ServerAddress, peers []pb.ServerAddress) bool {
-	sort.Slice(peers, func(i, j int) bool {
-		return strings.Compare(string(peers[i]), string(peers[j])) < 0
-	})
-	if len(peers) <= 0 {
-		return true
-	}
-	return self == peers[0]
-}
-
 func (s *RaftServer) DoJoinCommand() {
 
 	glog.V(0).Infoln("Initializing new cluster")
diff --git a/weed/server/raft_server_handlers.go b/weed/server/raft_server_handlers.go
index 7e58f1e92..cc3e6e37f 100644
--- a/weed/server/raft_server_handlers.go
+++ b/weed/server/raft_server_handlers.go
@@ -25,3 +25,11 @@ func (s *RaftServer) StatusHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	writeJsonQuiet(w, r, http.StatusOK, ret)
 }
+
+func (s *RaftServer) StatsRaftHandler(w http.ResponseWriter, r *http.Request) {
+	if s.RaftHashicorp == nil {
+		writeJsonQuiet(w, r, http.StatusNotFound, nil)
+		return
+	}
+	writeJsonQuiet(w, r, http.StatusOK, s.RaftHashicorp.Stats())
+}
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index 898c3da12..476937847 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -3,7 +3,12 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"path/filepath"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
@@ -247,3 +252,41 @@ func (vs *VolumeServer) VolumeNeedleStatus(ctx context.Context, req *volume_serv
 	return resp, nil
 
 }
+
+func (vs *VolumeServer) Ping(ctx context.Context, req *volume_server_pb.PingRequest) (resp *volume_server_pb.PingResponse, pingErr error) {
+	resp = &volume_server_pb.PingResponse{
+		StartTimeNs: time.Now().UnixNano(),
+	}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			pingResp, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			pingResp, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			pingResp, err := client.Ping(ctx, &master_pb.PingRequest{})
+			if pingResp != nil {
+				resp.RemoteTimeNs = pingResp.StartTimeNs
+			}
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	resp.StopTimeNs = time.Now().UnixNano()
+	return
+}
diff --git a/weed/shell/command_cluster_check.go b/weed/shell/command_cluster_check.go
new file mode 100644
index 000000000..616669b6d
--- /dev/null
+++ b/weed/shell/command_cluster_check.go
@@ -0,0 +1,248 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandClusterCheck{})
+}
+
+type commandClusterCheck struct {
+}
+
+func (c *commandClusterCheck) Name() string {
+	return "cluster.check"
+}
+
+func (c *commandClusterCheck) Help() string {
+	return `check current cluster network connectivity
+
+	cluster.check
+
+`
+}
+
+func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	clusterPsCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if err = clusterPsCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	// collect topology information
+	topologyInfo, volumeSizeLimitMb, err := collectTopologyInfo(commandEnv, 0)
+	if err != nil {
+		return err
+	}
+	fmt.Fprintf(writer, "Topology volumeSizeLimit:%d MB%s\n", volumeSizeLimitMb, diskInfosToString(topologyInfo.DiskInfos))
+
+	emptyDiskTypeDiskInfo, emptyDiskTypeFound := topologyInfo.DiskInfos[""]
+	hddDiskTypeDiskInfo, hddDiskTypeFound := topologyInfo.DiskInfos["hdd"]
+	if !emptyDiskTypeFound && !hddDiskTypeFound {
+		return fmt.Errorf("Need to a hdd disk type!")
+	}
+	if emptyDiskTypeFound && emptyDiskTypeDiskInfo.VolumeCount == 0 || hddDiskTypeFound && hddDiskTypeDiskInfo.VolumeCount == 0 {
+		return fmt.Errorf("Need to a hdd disk type!")
+	}
+
+	// collect filers
+	var filers []pb.ServerAddress
+	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+		resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+			ClientType: cluster.FilerType,
+		})
+
+		for _, node := range resp.ClusterNodes {
+			filers = append(filers, pb.ServerAddress(node.Address))
+		}
+		return err
+	})
+	if err != nil {
+		return
+	}
+	fmt.Fprintf(writer, "the cluster has %d filers: %+v\n", len(filers), filers)
+
+	// collect volume servers
+	var volumeServers []pb.ServerAddress
+	t, _, err := collectTopologyInfo(commandEnv, 0)
+	if err != nil {
+		return err
+	}
+	for _, dc := range t.DataCenterInfos {
+		for _, r := range dc.RackInfos {
+			for _, dn := range r.DataNodeInfos {
+				volumeServers = append(volumeServers, pb.NewServerAddressFromDataNode(dn))
+			}
+		}
+	}
+	fmt.Fprintf(writer, "the cluster has %d volume servers: %+v\n", len(volumeServers), volumeServers)
+
+	// collect all masters
+	var masters []pb.ServerAddress
+	for _, master := range commandEnv.MasterClient.GetMasters() {
+		masters = append(masters, master)
+	}
+
+	// check from master to volume servers
+	for _, master := range masters {
+		for _, volumeServer := range volumeServers {
+			fmt.Fprintf(writer, "checking master %s to volume server %s ... ", string(master), string(volumeServer))
+			err := pb.WithMasterClient(false, master, commandEnv.option.GrpcDialOption, func(client master_pb.SeaweedClient) error {
+				pong, err := client.Ping(context.Background(), &master_pb.PingRequest{
+					Target:     string(volumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between masters
+	for _, sourceMaster := range masters {
+		for _, targetMaster := range masters {
+			if sourceMaster == targetMaster {
+				continue
+			}
+			fmt.Fprintf(writer, "checking master %s to %s ... ", string(sourceMaster), string(targetMaster))
+			err := pb.WithMasterClient(false, sourceMaster, commandEnv.option.GrpcDialOption, func(client master_pb.SeaweedClient) error {
+				pong, err := client.Ping(context.Background(), &master_pb.PingRequest{
+					Target:     string(targetMaster),
+					TargetType: cluster.MasterType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from volume servers to masters
+	for _, volumeServer := range volumeServers {
+		for _, master := range masters {
+			fmt.Fprintf(writer, "checking volume server %s to master %s ... ", string(volumeServer), string(master))
+			err := pb.WithVolumeServerClient(false, volumeServer, commandEnv.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+				pong, err := client.Ping(context.Background(), &volume_server_pb.PingRequest{
+					Target:     string(master),
+					TargetType: cluster.MasterType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from filers to masters
+	for _, filer := range filers {
+		for _, master := range masters {
+			fmt.Fprintf(writer, "checking filer %s to master %s ... ", string(filer), string(master))
+			err := pb.WithFilerClient(false, filer, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				pong, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(master),
+					TargetType: cluster.MasterType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from filers to volume servers
+	for _, filer := range filers {
+		for _, volumeServer := range volumeServers {
+			fmt.Fprintf(writer, "checking filer %s to volume server %s ... ", string(filer), string(volumeServer))
+			err := pb.WithFilerClient(false, filer, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				pong, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(volumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between volume servers
+	for _, sourceVolumeServer := range volumeServers {
+		for _, targetVolumeServer := range volumeServers {
+			if sourceVolumeServer == targetVolumeServer {
+				continue
+			}
+			fmt.Fprintf(writer, "checking volume server %s to %s ... ", string(sourceVolumeServer), string(targetVolumeServer))
+			err := pb.WithVolumeServerClient(false, sourceVolumeServer, commandEnv.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+				pong, err := client.Ping(context.Background(), &volume_server_pb.PingRequest{
+					Target:     string(targetVolumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between filers, and need to connect to itself
+	for _, sourceFiler := range filers {
+		for _, targetFiler := range filers {
+			fmt.Fprintf(writer, "checking filer %s to %s ... ", string(sourceFiler), string(targetFiler))
+			err := pb.WithFilerClient(false, sourceFiler, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				pong, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(targetFiler),
+					TargetType: cluster.FilerType,
+				})
+				if err == nil {
+					printTiming(writer, pong.StartTimeNs, pong.RemoteTimeNs, pong.StopTimeNs)
+				}
+				return err
+			})
+			if err != nil {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func printTiming(writer io.Writer, startNs, remoteNs, stopNs int64) {
+	roundTripTimeMs := float32(stopNs-startNs) / 1000000
+	deltaTimeMs := float32(remoteNs-(startNs+stopNs)/2) / 1000000
+	fmt.Fprintf(writer, "ok round trip %.3fms clock delta %.3fms\n", roundTripTimeMs, deltaTimeMs)
+}
diff --git a/weed/shell/command_cluster_raft_add.go b/weed/shell/command_cluster_raft_add.go
new file mode 100644
index 000000000..e5f3c41c9
--- /dev/null
+++ b/weed/shell/command_cluster_raft_add.go
@@ -0,0 +1,59 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandRaftServerAdd{})
+}
+
+type commandRaftServerAdd struct {
+}
+
+func (c *commandRaftServerAdd) Name() string {
+	return "cluster.raft.add"
+}
+
+func (c *commandRaftServerAdd) Help() string {
+	return `add a server to the raft cluster
+
+	Example:
+		cluster.raft.add -id <server_name> -address <server_host:port> -voter
+`
+}
+
+func (c *commandRaftServerAdd) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	raftServerAddCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	serverId := raftServerAddCommand.String("id", "", "server id")
+	serverAddress := raftServerAddCommand.String("address", "", "server grpc address")
+	serverVoter := raftServerAddCommand.Bool("voter", true, "assign it a vote")
+	if err = raftServerAddCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	if *serverId == "" || *serverAddress == "" {
+		return fmt.Errorf("empty server id or address")
+	}
+
+	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+		_, err := client.RaftAddServer(context.Background(), &master_pb.RaftAddServerRequest{
+			Id:      *serverId,
+			Address: *serverAddress,
+			Voter:   *serverVoter,
+		})
+		if err != nil {
+			return fmt.Errorf("raft add server: %v", err)
+		}
+		println("added server", *serverId)
+		return nil
+	})
+
+	return err
+
+}
diff --git a/weed/shell/command_cluster_raft_ps.go b/weed/shell/command_cluster_raft_ps.go
new file mode 100644
index 000000000..ea868db06
--- /dev/null
+++ b/weed/shell/command_cluster_raft_ps.go
@@ -0,0 +1,51 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandRaftClusterPs{})
+}
+
+type commandRaftClusterPs struct {
+}
+
+func (c *commandRaftClusterPs) Name() string {
+	return "cluster.raft.ps"
+}
+
+func (c *commandRaftClusterPs) Help() string {
+	return `check current raft cluster status
+
+	cluster.raft.ps
+`
+}
+
+func (c *commandRaftClusterPs) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	raftClusterPsCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if err = raftClusterPsCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+		resp, err := client.RaftListClusterServers(context.Background(), &master_pb.RaftListClusterServersRequest{})
+		if err != nil {
+			return fmt.Errorf("raft list cluster: %v", err)
+		}
+		fmt.Fprintf(writer, "the raft cluster has %d servers\n", len(resp.ClusterServers))
+		for _, server := range resp.ClusterServers {
+			fmt.Fprintf(writer, "  * %s %s (%s)\n", server.Id, server.Address, server.Suffrage)
+		}
+
+		return nil
+	})
+
+	return err
+
+}
diff --git a/weed/shell/command_cluster_raft_remove.go b/weed/shell/command_cluster_raft_remove.go
new file mode 100644
index 000000000..532a1469c
--- /dev/null
+++ b/weed/shell/command_cluster_raft_remove.go
@@ -0,0 +1,56 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandRaftServerRemove{})
+}
+
+type commandRaftServerRemove struct {
+}
+
+func (c *commandRaftServerRemove) Name() string {
+	return "cluster.raft.remove"
+}
+
+func (c *commandRaftServerRemove) Help() string {
+	return `remove a server from the raft cluster
+
+	Example:
+		cluster.raft.remove -id <server_name>
+`
+}
+
+func (c *commandRaftServerRemove) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	raftServerAddCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	serverId := raftServerAddCommand.String("id", "", "server id")
+	if err = raftServerAddCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	if *serverId == "" {
+		return fmt.Errorf("empty server id")
+	}
+
+	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+		_, err := client.RaftRemoveServer(context.Background(), &master_pb.RaftRemoveServerRequest{
+			Id:    *serverId,
+			Force: true,
+		})
+		if err != nil {
+			return fmt.Errorf("raft remove server: %v", err)
+		}
+		println("removed server", *serverId)
+		return nil
+	})
+
+	return err
+
+}
diff --git a/weed/shell/command_ec_balance.go b/weed/shell/command_ec_balance.go
index 6cd91119b..393d44b80 100644
--- a/weed/shell/command_ec_balance.go
+++ b/weed/shell/command_ec_balance.go
@@ -4,12 +4,11 @@ import (
 	"flag"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
-	"github.com/chrislusf/seaweedfs/weed/storage/types"
-	"io"
-	"sort"
-
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
+	"io"
 )
 
 func init() {
@@ -411,8 +410,8 @@ func doBalanceEcRack(commandEnv *CommandEnv, ecRack *EcRack, applyBalancing bool
 	hasMove := true
 	for hasMove {
 		hasMove = false
-		sort.Slice(rackEcNodes, func(i, j int) bool {
-			return rackEcNodes[i].freeEcSlot > rackEcNodes[j].freeEcSlot
+		slices.SortFunc(rackEcNodes, func(a, b *EcNode) bool {
+			return a.freeEcSlot > b.freeEcSlot
 		})
 		emptyNode, fullNode := rackEcNodes[0], rackEcNodes[len(rackEcNodes)-1]
 		emptyNodeShardCount, fullNodeShardCount := ecNodeIdToShardCount[emptyNode.info.Id], ecNodeIdToShardCount[fullNode.info.Id]
@@ -492,8 +491,8 @@ func pickNEcShardsToMoveFrom(ecNodes []*EcNode, vid needle.VolumeId, n int) map[
 			})
 		}
 	}
-	sort.Slice(candidateEcNodes, func(i, j int) bool {
-		return candidateEcNodes[i].shardCount > candidateEcNodes[j].shardCount
+	slices.SortFunc(candidateEcNodes, func(a, b *CandidateEcNode) bool {
+		return a.shardCount > b.shardCount
 	})
 	for i := 0; i < n; i++ {
 		selectedEcNodeIndex := -1
diff --git a/weed/shell/command_ec_common.go b/weed/shell/command_ec_common.go
index b3bd0ce5d..27b650731 100644
--- a/weed/shell/command_ec_common.go
+++ b/weed/shell/command_ec_common.go
@@ -3,18 +3,17 @@ package shell
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/pb"
-	"github.com/chrislusf/seaweedfs/weed/storage/types"
-	"math"
-	"sort"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
 	"google.golang.org/grpc"
+	"math"
 )
 
 func moveMountedShardToEcNode(commandEnv *CommandEnv, existingLocation *EcNode, collection string, vid needle.VolumeId, shardId erasure_coding.ShardId, destinationEcNode *EcNode, applyBalancing bool) (err error) {
@@ -116,14 +115,14 @@ func eachDataNode(topo *master_pb.TopologyInfo, fn func(dc string, rack RackId,
 }
 
 func sortEcNodesByFreeslotsDecending(ecNodes []*EcNode) {
-	sort.Slice(ecNodes, func(i, j int) bool {
-		return ecNodes[i].freeEcSlot > ecNodes[j].freeEcSlot
+	slices.SortFunc(ecNodes, func(a, b *EcNode) bool {
+		return a.freeEcSlot > b.freeEcSlot
 	})
 }
 
 func sortEcNodesByFreeslotsAscending(ecNodes []*EcNode) {
-	sort.Slice(ecNodes, func(i, j int) bool {
-		return ecNodes[i].freeEcSlot < ecNodes[j].freeEcSlot
+	slices.SortFunc(ecNodes, func(a, b *EcNode) bool {
+		return a.freeEcSlot < b.freeEcSlot
 	})
 }
 
diff --git a/weed/shell/command_ec_encode.go b/weed/shell/command_ec_encode.go
index 9ae9b049c..251448908 100644
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@@ -95,7 +95,7 @@ func (c *commandEcEncode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 func doEcEncode(commandEnv *CommandEnv, collection string, vid needle.VolumeId, parallelCopy bool) (err error) {
 	// find volume location
 	locations, found := commandEnv.MasterClient.GetLocations(uint32(vid))
-	if !found {
+	if !found && len(locations) > 0 {
 		return fmt.Errorf("volume %d not found", vid)
 	}
 
diff --git a/weed/shell/command_fs_meta_cat.go b/weed/shell/command_fs_meta_cat.go
index a7de6d3ef..4616c072d 100644
--- a/weed/shell/command_fs_meta_cat.go
+++ b/weed/shell/command_fs_meta_cat.go
@@ -2,11 +2,10 @@ package shell
 
 import (
 	"fmt"
+	"github.com/golang/protobuf/jsonpb"
 	"github.com/golang/protobuf/proto"
+	"golang.org/x/exp/slices"
 	"io"
-	"sort"
-
-	"github.com/golang/protobuf/jsonpb"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -55,14 +54,12 @@ func (c *commandFsMetaCat) Do(args []string, commandEnv *CommandEnv, writer io.W
 			EmitDefaults: true,
 			Indent:       "  ",
 		}
-
-		sort.Slice(respLookupEntry.Entry.Chunks, func(i, j int) bool {
-			if respLookupEntry.Entry.Chunks[i].Offset == respLookupEntry.Entry.Chunks[j].Offset {
-				return respLookupEntry.Entry.Chunks[i].Mtime < respLookupEntry.Entry.Chunks[j].Mtime
+		slices.SortFunc(respLookupEntry.Entry.Chunks, func(a, b *filer_pb.FileChunk) bool {
+			if a.Offset == b.Offset {
+				return a.Mtime < b.Mtime
 			}
-			return respLookupEntry.Entry.Chunks[i].Offset < respLookupEntry.Entry.Chunks[j].Offset
+			return a.Offset < b.Offset
 		})
-
 		text, marshalErr := m.MarshalToString(respLookupEntry.Entry)
 		if marshalErr != nil {
 			return fmt.Errorf("marshal meta: %v", marshalErr)
diff --git a/weed/shell/command_mount_configure.go b/weed/shell/command_mount_configure.go
new file mode 100644
index 000000000..8c268d35c
--- /dev/null
+++ b/weed/shell/command_mount_configure.go
@@ -0,0 +1,64 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+	_ "google.golang.org/grpc/resolver/passthrough"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandMountConfigure{})
+}
+
+type commandMountConfigure struct {
+}
+
+func (c *commandMountConfigure) Name() string {
+	return "mount.configure"
+}
+
+func (c *commandMountConfigure) Help() string {
+	return `configure the mount on current server
+
+	mount.configure -dir=<mount_directory>
+
+	This command connects with local mount via unix socket, so it can only run locally.
+	The "mount_directory" value needs to be exactly the same as how mount was started in "weed mount -dir=<mount_directory>"
+
+`
+}
+
+func (c *commandMountConfigure) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	mountConfigureCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	mountDir := mountConfigureCommand.String("dir", "", "the mount directory same as how \"weed mount -dir=<mount_directory>\" was started")
+	mountQuota := mountConfigureCommand.Int("quotaMB", 0, "the quota in MB")
+	if err = mountConfigureCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	mountDirHash := util.HashToInt32([]byte(*mountDir))
+	if mountDirHash < 0 {
+		mountDirHash = -mountDirHash
+	}
+	localSocket := fmt.Sprintf("/tmp/seaweefs-mount-%d.sock", mountDirHash)
+
+	clientConn, err := grpc.Dial("passthrough:///unix://"+localSocket, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return
+	}
+	defer clientConn.Close()
+
+	client := mount_pb.NewSeaweedMountClient(clientConn)
+	_, err = client.Configure(context.Background(), &mount_pb.ConfigureRequest{
+		CollectionCapacity: int64(*mountQuota) * 1024 * 1024,
+	})
+
+	return
+}
diff --git a/weed/shell/command_s3_clean_uploads.go b/weed/shell/command_s3_clean_uploads.go
index 4f893df7a..a6dc8f574 100644
--- a/weed/shell/command_s3_clean_uploads.go
+++ b/weed/shell/command_s3_clean_uploads.go
@@ -3,6 +3,7 @@ package shell
 import (
 	"flag"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
 	"math"
@@ -39,6 +40,8 @@ func (c *commandS3CleanUploads) Do(args []string, commandEnv *CommandEnv, writer
 		return nil
 	}
 
+	signingKey := util.GetViper().GetString("jwt.signing.key")
+
 	var filerBucketsPath string
 	filerBucketsPath, err = readFilerBucketsPath(commandEnv)
 	if err != nil {
@@ -55,14 +58,16 @@ func (c *commandS3CleanUploads) Do(args []string, commandEnv *CommandEnv, writer
 	}
 
 	for _, bucket := range buckets {
-		c.cleanupUploads(commandEnv, writer, filerBucketsPath, bucket, *uploadedTimeAgo)
+		if err := c.cleanupUploads(commandEnv, writer, filerBucketsPath, bucket, *uploadedTimeAgo, signingKey); err != nil {
+			fmt.Fprintf(writer, fmt.Sprintf("failed cleanup uploads for backet %s: %v", bucket, err))
+		}
 	}
 
 	return err
 
 }
 
-func (c *commandS3CleanUploads) cleanupUploads(commandEnv *CommandEnv, writer io.Writer, filerBucketsPath string, bucket string, timeAgo time.Duration) error {
+func (c *commandS3CleanUploads) cleanupUploads(commandEnv *CommandEnv, writer io.Writer, filerBucketsPath string, bucket string, timeAgo time.Duration, signingKey string) error {
 	uploadsDir := filerBucketsPath + "/" + bucket + "/.uploads"
 	var staleUploads []string
 	now := time.Now()
@@ -77,12 +82,17 @@ func (c *commandS3CleanUploads) cleanupUploads(commandEnv *CommandEnv, writer io
 		return fmt.Errorf("list uploads under %v: %v", uploadsDir, err)
 	}
 
+	var encodedJwt security.EncodedJwt
+	if signingKey != "" {
+		encodedJwt = security.GenJwtForFilerServer(security.SigningKey(signingKey), 15*60)
+	}
+
 	for _, staleUpload := range staleUploads {
 		deleteUrl := fmt.Sprintf("http://%s%s/%s?recursive=true&ignoreRecursiveError=true", commandEnv.option.FilerAddress.ToHttpAddress(), uploadsDir, staleUpload)
 		fmt.Fprintf(writer, "purge %s\n", deleteUrl)
 
-		err = util.Delete(deleteUrl, "")
-		if err != nil {
+		err = util.Delete(deleteUrl, string(encodedJwt))
+		if err != nil && err.Error() != "" {
 			return fmt.Errorf("purge %s/%s: %v", uploadsDir, staleUpload, err)
 		}
 	}
diff --git a/weed/shell/command_volume_balance.go b/weed/shell/command_volume_balance.go
index 7a983de1a..b01d348c5 100644
--- a/weed/shell/command_volume_balance.go
+++ b/weed/shell/command_volume_balance.go
@@ -6,9 +6,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
 	"io"
 	"os"
-	"sort"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
@@ -224,14 +224,14 @@ func (n *Node) selectVolumes(fn func(v *master_pb.VolumeInformationMessage) bool
 }
 
 func sortWritableVolumes(volumes []*master_pb.VolumeInformationMessage) {
-	sort.Slice(volumes, func(i, j int) bool {
-		return volumes[i].Size < volumes[j].Size
+	slices.SortFunc(volumes, func(a, b *master_pb.VolumeInformationMessage) bool {
+		return a.Size < b.Size
 	})
 }
 
 func sortReadOnlyVolumes(volumes []*master_pb.VolumeInformationMessage) {
-	sort.Slice(volumes, func(i, j int) bool {
-		return volumes[i].Id < volumes[j].Id
+	slices.SortFunc(volumes, func(a, b *master_pb.VolumeInformationMessage) bool {
+		return a.Id < b.Id
 	})
 }
 
@@ -255,10 +255,9 @@ func balanceSelectedVolume(commandEnv *CommandEnv, diskType types.DiskType, volu
 
 	for hasMoved {
 		hasMoved = false
-		sort.Slice(nodesWithCapacity, func(i, j int) bool {
-			return nodesWithCapacity[i].localVolumeRatio(capacityFunc) < nodesWithCapacity[j].localVolumeRatio(capacityFunc)
+		slices.SortFunc(nodesWithCapacity, func(a, b *Node) bool {
+			return a.localVolumeRatio(capacityFunc) < b.localVolumeRatio(capacityFunc)
 		})
-
 		fullNode := nodesWithCapacity[len(nodesWithCapacity)-1]
 		var candidateVolumes []*master_pb.VolumeInformationMessage
 		for _, v := range fullNode.selectedVolumes {
diff --git a/weed/shell/command_volume_check_disk.go b/weed/shell/command_volume_check_disk.go
index 54edd53dd..53284096d 100644
--- a/weed/shell/command_volume_check_disk.go
+++ b/weed/shell/command_volume_check_disk.go
@@ -9,9 +9,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
+	"golang.org/x/exp/slices"
 	"io"
 	"math"
-	"sort"
 )
 
 func init() {
@@ -70,8 +70,8 @@ func (c *commandVolumeCheckDisk) Do(args []string, commandEnv *CommandEnv, write
 	}
 
 	for _, replicas := range volumeReplicas {
-		sort.Slice(replicas, func(i, j int) bool {
-			return fileCount(replicas[i]) > fileCount(replicas[j])
+		slices.SortFunc(replicas, func(a, b *VolumeReplica) bool {
+			return fileCount(a) > fileCount(b)
 		})
 		for len(replicas) >= 2 {
 			a, b := replicas[0], replicas[1]
diff --git a/weed/shell/command_volume_fix_replication.go b/weed/shell/command_volume_fix_replication.go
index 78285d8a5..c4bef5925 100644
--- a/weed/shell/command_volume_fix_replication.go
+++ b/weed/shell/command_volume_fix_replication.go
@@ -7,9 +7,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
 	"io"
 	"path/filepath"
-	"sort"
 	"strconv"
 	"time"
 
@@ -308,8 +308,8 @@ func (c *commandVolumeFixReplication) fixOneUnderReplicatedVolume(commandEnv *Co
 
 func keepDataNodesSorted(dataNodes []location, diskType types.DiskType) {
 	fn := capacityByFreeVolumeCount(diskType)
-	sort.Slice(dataNodes, func(i, j int) bool {
-		return fn(dataNodes[i].dataNode) > fn(dataNodes[j].dataNode)
+	slices.SortFunc(dataNodes, func(a, b location) bool {
+		return fn(a.dataNode) > fn(b.dataNode)
 	})
 }
 
@@ -488,9 +488,7 @@ func countReplicas(replicas []*VolumeReplica) (diffDc, diffRack, diffNode map[st
 }
 
 func pickOneReplicaToDelete(replicas []*VolumeReplica, replicaPlacement *super_block.ReplicaPlacement) *VolumeReplica {
-
-	sort.Slice(replicas, func(i, j int) bool {
-		a, b := replicas[i], replicas[j]
+	slices.SortFunc(replicas, func(a, b *VolumeReplica) bool {
 		if a.info.Size != b.info.Size {
 			return a.info.Size < b.info.Size
 		}
diff --git a/weed/shell/command_volume_fsck.go b/weed/shell/command_volume_fsck.go
index 1b3d7bf0d..7d3aa28a5 100644
--- a/weed/shell/command_volume_fsck.go
+++ b/weed/shell/command_volume_fsck.go
@@ -12,6 +12,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
@@ -92,8 +93,27 @@ func (c *commandVolumeFsck) Do(args []string, commandEnv *CommandEnv, writer io.
 		return fmt.Errorf("failed to collect all volume locations: %v", err)
 	}
 
+	isBucketsPath := false
+	var fillerBucketsPath string
+	if *findMissingChunksInFiler && *findMissingChunksInFilerPath != "" {
+		fillerBucketsPath, err = readFilerBucketsPath(commandEnv)
+		if err != nil {
+			return fmt.Errorf("read filer buckets path: %v", err)
+		}
+		if strings.HasPrefix(*findMissingChunksInFilerPath, fillerBucketsPath) {
+			isBucketsPath = true
+		}
+	}
+	if err != nil {
+		return fmt.Errorf("read filer buckets path: %v", err)
+	}
+
 	// collect each volume file ids
 	for volumeId, vinfo := range volumeIdToVInfo {
+		if isBucketsPath && !strings.HasPrefix(*findMissingChunksInFilerPath, fillerBucketsPath+"/"+vinfo.collection) {
+			delete(volumeIdToVInfo, volumeId)
+			continue
+		}
 		err = c.collectOneVolumeFileIds(tempFolder, volumeId, vinfo, *verbose, writer)
 		if err != nil {
 			return fmt.Errorf("failed to collect file ids from volume %d on %s: %v", volumeId, vinfo.server, err)
diff --git a/weed/shell/command_volume_list.go b/weed/shell/command_volume_list.go
index 4c0429ecb..9150752d5 100644
--- a/weed/shell/command_volume_list.go
+++ b/weed/shell/command_volume_list.go
@@ -6,9 +6,9 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
+	"golang.org/x/exp/slices"
 
 	"io"
-	"sort"
 )
 
 func init() {
@@ -67,8 +67,8 @@ func diskInfoToString(diskInfo *master_pb.DiskInfo) string {
 
 func writeTopologyInfo(writer io.Writer, t *master_pb.TopologyInfo, volumeSizeLimitMb uint64, verbosityLevel int) statistics {
 	output(verbosityLevel >= 0, writer, "Topology volumeSizeLimit:%d MB%s\n", volumeSizeLimitMb, diskInfosToString(t.DiskInfos))
-	sort.Slice(t.DataCenterInfos, func(i, j int) bool {
-		return t.DataCenterInfos[i].Id < t.DataCenterInfos[j].Id
+	slices.SortFunc(t.DataCenterInfos, func(a, b *master_pb.DataCenterInfo) bool {
+		return a.Id < b.Id
 	})
 	var s statistics
 	for _, dc := range t.DataCenterInfos {
@@ -80,8 +80,8 @@ func writeTopologyInfo(writer io.Writer, t *master_pb.TopologyInfo, volumeSizeLi
 func writeDataCenterInfo(writer io.Writer, t *master_pb.DataCenterInfo, verbosityLevel int) statistics {
 	output(verbosityLevel >= 1, writer, "  DataCenter %s%s\n", t.Id, diskInfosToString(t.DiskInfos))
 	var s statistics
-	sort.Slice(t.RackInfos, func(i, j int) bool {
-		return t.RackInfos[i].Id < t.RackInfos[j].Id
+	slices.SortFunc(t.RackInfos, func(a, b *master_pb.RackInfo) bool {
+		return a.Id < b.Id
 	})
 	for _, r := range t.RackInfos {
 		s = s.plus(writeRackInfo(writer, r, verbosityLevel))
@@ -92,8 +92,8 @@ func writeDataCenterInfo(writer io.Writer, t *master_pb.DataCenterInfo, verbosit
 func writeRackInfo(writer io.Writer, t *master_pb.RackInfo, verbosityLevel int) statistics {
 	output(verbosityLevel >= 2, writer, "    Rack %s%s\n", t.Id, diskInfosToString(t.DiskInfos))
 	var s statistics
-	sort.Slice(t.DataNodeInfos, func(i, j int) bool {
-		return t.DataNodeInfos[i].Id < t.DataNodeInfos[j].Id
+	slices.SortFunc(t.DataNodeInfos, func(a, b *master_pb.DataNodeInfo) bool {
+		return a.Id < b.Id
 	})
 	for _, dn := range t.DataNodeInfos {
 		s = s.plus(writeDataNodeInfo(writer, dn, verbosityLevel))
@@ -118,8 +118,8 @@ func writeDiskInfo(writer io.Writer, t *master_pb.DiskInfo, verbosityLevel int)
 		diskType = "hdd"
 	}
 	output(verbosityLevel >= 4, writer, "        Disk %s(%s)\n", diskType, diskInfoToString(t))
-	sort.Slice(t.VolumeInfos, func(i, j int) bool {
-		return t.VolumeInfos[i].Id < t.VolumeInfos[j].Id
+	slices.SortFunc(t.VolumeInfos, func(a, b *master_pb.VolumeInformationMessage) bool {
+		return a.Id < b.Id
 	})
 	for _, vi := range t.VolumeInfos {
 		s = s.plus(writeVolumeInformationMessage(writer, vi, verbosityLevel))
diff --git a/weed/shell/command_volume_server_evacuate.go b/weed/shell/command_volume_server_evacuate.go
index 31ebcfec1..f07ea4b79 100644
--- a/weed/shell/command_volume_server_evacuate.go
+++ b/weed/shell/command_volume_server_evacuate.go
@@ -8,9 +8,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
 	"io"
 	"os"
-	"sort"
 )
 
 func init() {
@@ -153,11 +153,9 @@ func evacuateEcVolumes(commandEnv *CommandEnv, topologyInfo *master_pb.TopologyI
 func moveAwayOneEcVolume(commandEnv *CommandEnv, ecShardInfo *master_pb.VolumeEcShardInformationMessage, thisNode *EcNode, otherNodes []*EcNode, applyChange bool) (hasMoved bool, err error) {
 
 	for _, shardId := range erasure_coding.ShardBits(ecShardInfo.EcIndexBits).ShardIds() {
-
-		sort.Slice(otherNodes, func(i, j int) bool {
-			return otherNodes[i].localShardIdCount(ecShardInfo.Id) < otherNodes[j].localShardIdCount(ecShardInfo.Id)
+		slices.SortFunc(otherNodes, func(a, b *EcNode) bool {
+			return a.localShardIdCount(ecShardInfo.Id) < b.localShardIdCount(ecShardInfo.Id)
 		})
-
 		for i := 0; i < len(otherNodes); i++ {
 			emptyNode := otherNodes[i]
 			collectionPrefix := ""
@@ -188,10 +186,9 @@ func moveAwayOneNormalVolume(commandEnv *CommandEnv, volumeReplicas map[uint32][
 			return v.DiskType == vol.DiskType
 		})
 	}
-	sort.Slice(otherNodes, func(i, j int) bool {
-		return otherNodes[i].localVolumeRatio(fn) > otherNodes[j].localVolumeRatio(fn)
+	slices.SortFunc(otherNodes, func(a, b *Node) bool {
+		return a.localVolumeRatio(fn) > b.localVolumeRatio(fn)
 	})
-
 	for i := 0; i < len(otherNodes); i++ {
 		emptyNode := otherNodes[i]
 		hasMoved, err = maybeMoveOneVolume(commandEnv, volumeReplicas, thisNode, vol, emptyNode, applyChange)
diff --git a/weed/shell/command_volume_vacuum.go b/weed/shell/command_volume_vacuum.go
index 61b1f06fa..fc454c9ff 100644
--- a/weed/shell/command_volume_vacuum.go
+++ b/weed/shell/command_volume_vacuum.go
@@ -22,7 +22,7 @@ func (c *commandVacuum) Name() string {
 func (c *commandVacuum) Help() string {
 	return `compact volumes if deleted entries are more than the limit
 
-	volume.vacuum [-garbageThreshold=0.3]
+	volume.vacuum [-garbageThreshold=0.3] [-collection=<collection name>] [-volumeId=<volume id>]
 
 `
 }
@@ -31,6 +31,8 @@ func (c *commandVacuum) Do(args []string, commandEnv *CommandEnv, writer io.Writ
 
 	volumeVacuumCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	garbageThreshold := volumeVacuumCommand.Float64("garbageThreshold", 0.3, "vacuum when garbage is more than this limit")
+	collection := volumeVacuumCommand.String("collection", "", "vacuum this collection")
+	volumeId := volumeVacuumCommand.Uint("volumeId", 0, "the volume id")
 	if err = volumeVacuumCommand.Parse(args); err != nil {
 		return
 	}
@@ -42,6 +44,8 @@ func (c *commandVacuum) Do(args []string, commandEnv *CommandEnv, writer io.Writ
 	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
 		_, err = client.VacuumVolume(context.Background(), &master_pb.VacuumVolumeRequest{
 			GarbageThreshold: float32(*garbageThreshold),
+			VolumeId:         uint32(*volumeId),
+			Collection:       *collection,
 		})
 		return err
 	})
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index ec71edee0..3ff49f1d2 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -46,7 +46,7 @@ var (
 func NewCommandEnv(options *ShellOptions) *CommandEnv {
 	ce := &CommandEnv{
 		env:          make(map[string]string),
-		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", "", pb.ServerAddresses(*options.Masters).ToAddresses()),
+		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", "", pb.ServerAddresses(*options.Masters).ToAddressMap()),
 		option:       options,
 	}
 	ce.locker = exclusive_locks.NewExclusiveLocker(ce.MasterClient, "admin")
diff --git a/weed/shell/shell_liner.go b/weed/shell/shell_liner.go
index 90ce2dbb4..94a68f5bc 100644
--- a/weed/shell/shell_liner.go
+++ b/weed/shell/shell_liner.go
@@ -8,12 +8,12 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/util/grace"
+	"golang.org/x/exp/slices"
 	"io"
 	"math/rand"
 	"os"
 	"path"
 	"regexp"
-	"sort"
 	"strings"
 
 	"github.com/peterh/liner"
@@ -25,11 +25,9 @@ var (
 )
 
 func RunShell(options ShellOptions) {
-
-	sort.Slice(Commands, func(i, j int) bool {
-		return strings.Compare(Commands[i].Name(), Commands[j].Name()) < 0
+	slices.SortFunc(Commands, func(a, b command) bool {
+		return strings.Compare(a.Name(), b.Name()) < 0
 	})
-
 	line = liner.NewLiner()
 	defer line.Close()
 	grace.OnInterrupt(func() {
diff --git a/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.eot b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.eot
new file mode 100644
index 000000000..4a4ca865d
--- /dev/null
+++ b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.eot
diff --git a/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.svg b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.svg
new file mode 100644
index 000000000..25691af8f
--- /dev/null
+++ b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.svg
@@ -0,0 +1,229 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<svg xmlns="http://www.w3.org/2000/svg">
+<metadata></metadata>
+<defs>
+<font id="glyphicons_halflingsregular" horiz-adv-x="1200" >
+<font-face units-per-em="1200" ascent="960" descent="-240" />
+<missing-glyph horiz-adv-x="500" />
+<glyph />
+<glyph />
+<glyph unicode="&#xd;" />
+<glyph unicode=" " />
+<glyph unicode="*" d="M100 500v200h259l-183 183l141 141l183 -183v259h200v-259l183 183l141 -141l-183 -183h259v-200h-259l183 -183l-141 -141l-183 183v-259h-200v259l-183 -183l-141 141l183 183h-259z" />
+<glyph unicode="+" d="M0 400v300h400v400h300v-400h400v-300h-400v-400h-300v400h-400z" />
+<glyph unicode="&#xa0;" />
+<glyph unicode="&#x2000;" horiz-adv-x="652" />
+<glyph unicode="&#x2001;" horiz-adv-x="1304" />
+<glyph unicode="&#x2002;" horiz-adv-x="652" />
+<glyph unicode="&#x2003;" horiz-adv-x="1304" />
+<glyph unicode="&#x2004;" horiz-adv-x="434" />
+<glyph unicode="&#x2005;" horiz-adv-x="326" />
+<glyph unicode="&#x2006;" horiz-adv-x="217" />
+<glyph unicode="&#x2007;" horiz-adv-x="217" />
+<glyph unicode="&#x2008;" horiz-adv-x="163" />
+<glyph unicode="&#x2009;" horiz-adv-x="260" />
+<glyph unicode="&#x200a;" horiz-adv-x="72" />
+<glyph unicode="&#x202f;" horiz-adv-x="260" />
+<glyph unicode="&#x205f;" horiz-adv-x="326" />
+<glyph unicode="&#x20ac;" d="M100 500l100 100h113q0 47 5 100h-218l100 100h135q37 167 112 257q117 141 297 141q242 0 354 -189q60 -103 66 -209h-181q0 55 -25.5 99t-63.5 68t-75 36.5t-67 12.5q-24 0 -52.5 -10t-62.5 -32t-65.5 -67t-50.5 -107h379l-100 -100h-300q-6 -46 -6 -100h406l-100 -100 h-300q9 -74 33 -132t52.5 -91t62 -54.5t59 -29t46.5 -7.5q29 0 66 13t75 37t63.5 67.5t25.5 96.5h174q-31 -172 -128 -278q-107 -117 -274 -117q-205 0 -324 158q-36 46 -69 131.5t-45 205.5h-217z" />
+<glyph unicode="&#x2212;" d="M200 400h900v300h-900v-300z" />
+<glyph unicode="&#x25fc;" horiz-adv-x="500" d="M0 0z" />
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+<glyph unicode="&#x2709;" d="M0 100l400 400l200 -200l200 200l400 -400h-1200zM0 300v600l300 -300zM0 1100l600 -603l600 603h-1200zM900 600l300 300v-600z" />
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+</font>
+</defs></svg>
\ No newline at end of file
diff --git a/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.ttf b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.ttf
new file mode 100644
index 000000000..67fa00bf8
--- /dev/null
+++ b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.ttf
diff --git a/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.woff b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.woff
new file mode 100644
index 000000000..8c54182aa
--- /dev/null
+++ b/weed/static/bootstrap/3.3.1/fonts/glyphicons-halflings-regular.woff
diff --git a/weed/static/images/folder.gif b/weed/static/images/folder.gif
index 400a1f7ca..6ee082081 100644
--- a/weed/static/images/folder.gif
+++ b/weed/static/images/folder.gif
diff --git a/weed/storage/disk_location_ec.go b/weed/storage/disk_location_ec.go
index 3f56d797b..5fa5316fd 100644
--- a/weed/storage/disk_location_ec.go
+++ b/weed/storage/disk_location_ec.go
@@ -2,10 +2,10 @@ package storage
 
 import (
 	"fmt"
+	"golang.org/x/exp/slices"
 	"os"
 	"path"
 	"regexp"
-	"sort"
 	"strconv"
 
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
@@ -128,11 +128,9 @@ func (l *DiskLocation) loadAllEcShards() (err error) {
 		}
 		dirEntries = append(dirEntries, indexDirEntries...)
 	}
-
-	sort.Slice(dirEntries, func(i, j int) bool {
-		return dirEntries[i].Name() < dirEntries[j].Name()
+	slices.SortFunc(dirEntries, func(a, b os.DirEntry) bool {
+		return a.Name() < b.Name()
 	})
-
 	var sameVolumeShards []string
 	var prevVolumeId needle.VolumeId
 	for _, fileInfo := range dirEntries {
diff --git a/weed/storage/erasure_coding/ec_encoder.go b/weed/storage/erasure_coding/ec_encoder.go
index 34b639407..157149865 100644
--- a/weed/storage/erasure_coding/ec_encoder.go
+++ b/weed/storage/erasure_coding/ec_encoder.go
@@ -220,7 +220,7 @@ func encodeDatFile(remainingSize int64, err error, baseFileName string, bufferSi
 		processedSize += largeBlockSize * DataShardsCount
 	}
 	for remainingSize > 0 {
-		encodeData(file, enc, processedSize, smallBlockSize, buffers, outputs)
+		err = encodeData(file, enc, processedSize, smallBlockSize, buffers, outputs)
 		if err != nil {
 			return fmt.Errorf("failed to encode small chunk data: %v", err)
 		}
diff --git a/weed/storage/erasure_coding/ec_volume.go b/weed/storage/erasure_coding/ec_volume.go
index f4cde310f..4dd07ec40 100644
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/volume_info"
+	"golang.org/x/exp/slices"
 	"math"
 	"os"
-	"sort"
 	"sync"
 	"time"
 
@@ -82,9 +82,8 @@ func (ev *EcVolume) AddEcVolumeShard(ecVolumeShard *EcVolumeShard) bool {
 		}
 	}
 	ev.Shards = append(ev.Shards, ecVolumeShard)
-	sort.Slice(ev.Shards, func(i, j int) bool {
-		return ev.Shards[i].VolumeId < ev.Shards[j].VolumeId ||
-			ev.Shards[i].VolumeId == ev.Shards[j].VolumeId && ev.Shards[i].ShardId < ev.Shards[j].ShardId
+	slices.SortFunc(ev.Shards, func(a, b *EcVolumeShard) bool {
+		return a.VolumeId < b.VolumeId || a.VolumeId == b.VolumeId && a.ShardId < b.ShardId
 	})
 	return true
 }
diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index 70e1593a0..0c9de45aa 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -4,9 +4,9 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"golang.org/x/exp/slices"
 	"io"
 	"os"
-	"sort"
 	"sync"
 	"time"
 
@@ -389,8 +389,8 @@ func (s *Store) EcVolumes() (ecVolumes []*erasure_coding.EcVolume) {
 		}
 		location.ecVolumesLock.RUnlock()
 	}
-	sort.Slice(ecVolumes, func(i, j int) bool {
-		return ecVolumes[i].VolumeId > ecVolumes[j].VolumeId
+	slices.SortFunc(ecVolumes, func(a, b *erasure_coding.EcVolume) bool {
+		return a.VolumeId > b.VolumeId
 	})
 	return ecVolumes
 }
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index 14bc5f22d..6d48fbc83 100644
--- a/weed/storage/volume.go
+++ b/weed/storage/volume.go
@@ -260,7 +260,7 @@ func (v *Volume) collectStatus() (maxFileKey types.NeedleId, datFileSize int64,
 	defer v.dataFileAccessLock.RUnlock()
 	glog.V(3).Infof("collectStatus volume %d", v.Id)
 
-	if v.nm == nil {
+	if v.nm == nil || v.DataBackend == nil {
 		return
 	}
 
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 06de181b5..7651420aa 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -438,8 +438,7 @@ func copyDataBasedOnIndexFile(srcDatName, srcIdxName, dstDatName, datIdxName str
 		}
 
 		n := new(needle.Needle)
-		err := n.ReadData(srcDatBackend, offset.ToActualOffset(), size, version)
-		if err != nil {
+		if err := n.ReadData(srcDatBackend, offset.ToActualOffset(), size, version); err != nil {
 			return fmt.Errorf("cannot hydrate needle from file: %s", err)
 		}
 
diff --git a/weed/topology/cluster_commands.go b/weed/topology/cluster_commands.go
index 152691ccb..1bcc6b449 100644
--- a/weed/topology/cluster_commands.go
+++ b/weed/topology/cluster_commands.go
@@ -1,9 +1,12 @@
 package topology
 
 import (
+	"encoding/json"
+	"fmt"
 	"github.com/chrislusf/raft"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	hashicorpRaft "github.com/hashicorp/raft"
 )
 
 type MaxVolumeIdCommand struct {
@@ -20,6 +23,7 @@ func (c *MaxVolumeIdCommand) CommandName() string {
 	return "MaxVolumeId"
 }
 
+// deprecatedCommandApply represents the old interface to apply a command to the server.
 func (c *MaxVolumeIdCommand) Apply(server raft.Server) (interface{}, error) {
 	topo := server.Context().(*Topology)
 	before := topo.GetMaxVolumeId()
@@ -29,3 +33,19 @@ func (c *MaxVolumeIdCommand) Apply(server raft.Server) (interface{}, error) {
 
 	return nil, nil
 }
+
+func (s *MaxVolumeIdCommand) Persist(sink hashicorpRaft.SnapshotSink) error {
+	b, err := json.Marshal(s)
+	if err != nil {
+		return fmt.Errorf("marshal: %v", err)
+	}
+	_, err = sink.Write(b)
+	if err != nil {
+		sink.Cancel()
+		return fmt.Errorf("sink.Write(): %v", err)
+	}
+	return sink.Close()
+}
+
+func (s *MaxVolumeIdCommand) Release() {
+}
diff --git a/weed/topology/data_node_ec.go b/weed/topology/data_node_ec.go
index 330b16b24..bf72fa9af 100644
--- a/weed/topology/data_node_ec.go
+++ b/weed/topology/data_node_ec.go
@@ -58,7 +58,7 @@ func (dn *DataNode) UpdateEcShards(actualShards []*erasure_coding.EcVolumeInfo)
 	}
 
 	for _, ecShards := range actualShards {
-		if dn.hasEcShards(ecShards.VolumeId) {
+		if dn.HasEcShards(ecShards.VolumeId) {
 			continue
 		}
 
@@ -79,7 +79,7 @@ func (dn *DataNode) UpdateEcShards(actualShards []*erasure_coding.EcVolumeInfo)
 	return
 }
 
-func (dn *DataNode) hasEcShards(volumeId needle.VolumeId) (found bool) {
+func (dn *DataNode) HasEcShards(volumeId needle.VolumeId) (found bool) {
 	dn.RLock()
 	defer dn.RUnlock()
 	for _, c := range dn.children {
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 207c89ad7..aacdfa7d2 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -1,6 +1,7 @@
 package topology
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
@@ -10,6 +11,7 @@ import (
 	"time"
 
 	"github.com/chrislusf/raft"
+	hashicorpRaft "github.com/hashicorp/raft"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
@@ -40,7 +42,8 @@ type Topology struct {
 
 	Configuration *Configuration
 
-	RaftServer raft.Server
+	RaftServer    raft.Server
+	HashicorpRaft *hashicorpRaft.Raft
 }
 
 func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, pulse int, replicationAsMin bool) *Topology {
@@ -76,6 +79,10 @@ func (t *Topology) IsLeader() bool {
 				return true
 			}
 		}
+	} else if t.HashicorpRaft != nil {
+		if t.HashicorpRaft.State() == hashicorpRaft.Leader {
+			return true
+		}
 	}
 	return false
 }
@@ -85,6 +92,8 @@ func (t *Topology) Leader() (pb.ServerAddress, error) {
 	for count := 0; count < 3; count++ {
 		if t.RaftServer != nil {
 			l = pb.ServerAddress(t.RaftServer.Leader())
+		} else if t.HashicorpRaft != nil {
+			l = pb.ServerAddress(t.HashicorpRaft.Leader())
 		} else {
 			return "", errors.New("Raft Server not ready yet!")
 		}
@@ -124,8 +133,18 @@ func (t *Topology) Lookup(collection string, vid needle.VolumeId) (dataNodes []*
 func (t *Topology) NextVolumeId() (needle.VolumeId, error) {
 	vid := t.GetMaxVolumeId()
 	next := vid.Next()
-	if _, err := t.RaftServer.Do(NewMaxVolumeIdCommand(next)); err != nil {
-		return 0, err
+	if t.RaftServer != nil {
+		if _, err := t.RaftServer.Do(NewMaxVolumeIdCommand(next)); err != nil {
+			return 0, err
+		}
+	} else if t.HashicorpRaft != nil {
+		b, err := json.Marshal(NewMaxVolumeIdCommand(next))
+		if err != nil {
+			return 0, fmt.Errorf("failed marshal NewMaxVolumeIdCommand: %+v", err)
+		}
+		if future := t.HashicorpRaft.Apply(b, time.Second); future.Error() != nil {
+			return 0, future.Error()
+		}
 	}
 	return next, nil
 }
@@ -283,3 +302,14 @@ func (t *Topology) IncrementalSyncDataNodeRegistration(newVolumes, deletedVolume
 
 	return
 }
+
+func (t *Topology) DataNodeRegistration(dcName, rackName string ,dn *DataNode){
+	if dn.Parent() != nil{
+		return
+	}
+	// registration to topo
+	dc := t.GetOrCreateDataCenter(dcName)
+	rack := dc.GetOrCreateRack(rackName)
+	rack.LinkChildNode(dn)
+	glog.Infof("[%s] reLink To topo  ", dn.Id())
+}
\ No newline at end of file
diff --git a/weed/topology/topology_event_handling.go b/weed/topology/topology_event_handling.go
index 0f1db74df..fe3717233 100644
--- a/weed/topology/topology_event_handling.go
+++ b/weed/topology/topology_event_handling.go
@@ -1,6 +1,7 @@
 package topology
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"google.golang.org/grpc"
 	"math/rand"
@@ -24,7 +25,7 @@ func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, g
 		c := time.Tick(15 * time.Minute)
 		for _ = range c {
 			if t.IsLeader() {
-				t.Vacuum(grpcDialOption, garbageThreshold, preallocate)
+				t.Vacuum(grpcDialOption, garbageThreshold, 0, "", preallocate)
 			}
 		}
 	}(garbageThreshold)
@@ -84,7 +85,8 @@ func (t *Topology) UnRegisterDataNode(dn *DataNode) {
 
 	negativeUsages := dn.GetDiskUsages().negative()
 	dn.UpAdjustDiskUsageDelta(negativeUsages)
-
+	dn.DeltaUpdateVolumes([]storage.VolumeInfo{}, dn.GetVolumes())
+	dn.DeltaUpdateEcShards([]*erasure_coding.EcVolumeInfo{}, dn.GetEcShards())
 	if dn.Parent() != nil {
 		dn.Parent().UnlinkChildNode(dn.Id())
 	}
diff --git a/weed/topology/topology_vacuum.go b/weed/topology/topology_vacuum.go
index 74d70bcdb..147220f4a 100644
--- a/weed/topology/topology_vacuum.go
+++ b/weed/topology/topology_vacuum.go
@@ -60,6 +60,7 @@ func (t *Topology) batchVacuumVolumeCheck(grpcDialOption grpc.DialOption, vid ne
 	}
 	return vacuumLocationList, errCount == 0 && len(vacuumLocationList.list) > 0
 }
+
 func (t *Topology) batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid needle.VolumeId,
 	locationlist *VolumeLocationList, preallocate int64) bool {
 	vl.accessLock.Lock()
@@ -116,6 +117,7 @@ func (t *Topology) batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *
 	}
 	return isVacuumSuccess
 }
+
 func (t *Topology) batchVacuumVolumeCommit(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid needle.VolumeId, locationlist *VolumeLocationList) bool {
 	isCommitSuccess := true
 	isReadOnly := false
@@ -144,6 +146,7 @@ func (t *Topology) batchVacuumVolumeCommit(grpcDialOption grpc.DialOption, vl *V
 	}
 	return isCommitSuccess
 }
+
 func (t *Topology) batchVacuumVolumeCleanup(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid needle.VolumeId, locationlist *VolumeLocationList) {
 	for _, dn := range locationlist.list {
 		glog.V(0).Infoln("Start cleaning up", vid, "on", dn.Url())
@@ -161,7 +164,7 @@ func (t *Topology) batchVacuumVolumeCleanup(grpcDialOption grpc.DialOption, vl *
 	}
 }
 
-func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, preallocate int64) {
+func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, volumeId uint32, collection string, preallocate int64) {
 
 	// if there is vacuum going on, return immediately
 	swapped := atomic.CompareAndSwapInt64(&t.vacuumLockCounter, 0, 1)
@@ -172,12 +175,19 @@ func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float
 
 	// now only one vacuum process going on
 
-	glog.V(1).Infof("Start vacuum on demand with threshold: %f", garbageThreshold)
+	glog.V(1).Infof("Start vacuum on demand with threshold: %f collection: %s volumeId: %d",
+		garbageThreshold, collection, volumeId)
 	for _, col := range t.collectionMap.Items() {
 		c := col.(*Collection)
+		if collection != "" && collection != c.Name {
+			continue
+		}
 		for _, vl := range c.storageType2VolumeLayout.Items() {
 			if vl != nil {
 				volumeLayout := vl.(*VolumeLayout)
+				if volumeId > 0 && volumeLayout.Lookup(needle.VolumeId(volumeId)) == nil {
+					continue
+				}
 				t.vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, preallocate)
 			}
 		}
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index de840f18f..167aee8ea 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -440,8 +440,11 @@ func (vl *VolumeLayout) SetVolumeCapacityFull(vid needle.VolumeId) bool {
 	vl.accessLock.Lock()
 	defer vl.accessLock.Unlock()
 
-	glog.V(0).Infof("Volume %d reaches full capacity.", vid)
-	return vl.removeFromWritable(vid)
+	wasWritable := vl.removeFromWritable(vid)
+	if wasWritable {
+		glog.V(0).Infof("Volume %d reaches full capacity.", vid)
+	}
+	return wasWritable
 }
 
 func (vl *VolumeLayout) removeFromCrowded(vid needle.VolumeId) {
diff --git a/weed/util/chunk_cache/on_disk_cache_layer.go b/weed/util/chunk_cache/on_disk_cache_layer.go
index 9115b1bb1..de32fb445 100644
--- a/weed/util/chunk_cache/on_disk_cache_layer.go
+++ b/weed/util/chunk_cache/on_disk_cache_layer.go
@@ -2,12 +2,11 @@ package chunk_cache
 
 import (
 	"fmt"
-	"path"
-	"sort"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"golang.org/x/exp/slices"
+	"path"
 )
 
 type OnDiskCacheLayer struct {
@@ -33,10 +32,9 @@ func NewOnDiskCacheLayer(dir, namePrefix string, diskSize int64, segmentCount in
 	}
 
 	// keep newest cache to the front
-	sort.Slice(c.diskCaches, func(i, j int) bool {
-		return c.diskCaches[i].lastModTime.After(c.diskCaches[j].lastModTime)
+	slices.SortFunc(c.diskCaches, func(a, b *ChunkCacheVolume) bool {
+		return a.lastModTime.After(b.lastModTime)
 	})
-
 	return c
 }
 
diff --git a/weed/util/constants.go b/weed/util/constants.go
index ea10f32f5..5518f1c0e 100644
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.95)
+	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.99)
 	VERSION        = sizeLimit + " " + VERSION_NUMBER
 	COMMIT         = ""
 )
diff --git a/weed/util/log_buffer/log_buffer.go b/weed/util/log_buffer/log_buffer.go
index d5e6cb214..422575193 100644
--- a/weed/util/log_buffer/log_buffer.go
+++ b/weed/util/log_buffer/log_buffer.go
@@ -58,9 +58,13 @@ func NewLogBuffer(name string, flushInterval time.Duration, flushFn func(startTi
 
 func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64) {
 
+	var toFlush *dataToFlush
 	m.Lock()
 	defer func() {
 		m.Unlock()
+		if toFlush != nil {
+			m.flushChan <- toFlush
+		}
 		if m.notifyFn != nil {
 			m.notifyFn()
 		}
@@ -96,7 +100,7 @@ func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64)
 
 	if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
 		// glog.V(4).Infof("%s copyToFlush1 start time %v, ts %v, remaining %d bytes", m.name, m.startTime, ts, len(m.buf)-m.pos)
-		m.flushChan <- m.copyToFlush()
+		toFlush = m.copyToFlush()
 		m.startTime = ts
 		if len(m.buf) < size+4 {
 			m.buf = make([]byte, 2*size+4)
@@ -148,8 +152,10 @@ func (m *LogBuffer) loopInterval() {
 			return
 		}
 		toFlush := m.copyToFlush()
-		m.flushChan <- toFlush
 		m.Unlock()
+		if toFlush != nil {
+			m.flushChan <- toFlush
+		}
 	}
 }
 
diff --git a/weed/util/skiplist/name_batch.go b/weed/util/skiplist/name_batch.go
index 71e5aeeba..53db5918f 100644
--- a/weed/util/skiplist/name_batch.go
+++ b/weed/util/skiplist/name_batch.go
@@ -3,7 +3,7 @@ package skiplist
 import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/golang/protobuf/proto"
-	"sort"
+	"golang.org/x/exp/slices"
 	"strings"
 )
 
@@ -41,8 +41,8 @@ func (nb *NameBatch) ListNames(startFrom string, visitNamesFn func(name string)
 			names = append(names, n)
 		}
 	}
-	sort.Slice(names, func(i, j int) bool {
-		return strings.Compare(names[i], names[j]) < 0
+	slices.SortFunc(names, func(a, b string) bool {
+		return strings.Compare(a, b) < 0
 	})
 	for _, n := range names {
 		if !visitNamesFn(n) {
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 5280305e2..b1b9d474e 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -18,7 +18,7 @@ type MasterClient struct {
 	clientType     string
 	clientHost     pb.ServerAddress
 	currentMaster  pb.ServerAddress
-	masters        []pb.ServerAddress
+	masters        map[string]pb.ServerAddress
 	grpcDialOption grpc.DialOption
 
 	vidMap
@@ -26,7 +26,7 @@ type MasterClient struct {
 	OnPeerUpdate func(update *master_pb.ClusterNodeUpdate)
 }
 
-func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost pb.ServerAddress, clientDataCenter string, masters []pb.ServerAddress) *MasterClient {
+func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost pb.ServerAddress, clientDataCenter string, masters map[string]pb.ServerAddress) *MasterClient {
 	return &MasterClient{
 		clientType:     clientType,
 		clientHost:     clientHost,
@@ -41,6 +41,11 @@ func (mc *MasterClient) GetMaster() pb.ServerAddress {
 	return mc.currentMaster
 }
 
+func (mc *MasterClient) GetMasters() map[string]pb.ServerAddress {
+	mc.WaitUntilConnected()
+	return mc.masters
+}
+
 func (mc *MasterClient) WaitUntilConnected() {
 	for mc.currentMaster == "" {
 		time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
@@ -154,6 +159,14 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 					glog.V(1).Infof("%s: %s masterClient removes volume %d", mc.clientType, loc.Url, deletedVid)
 					mc.deleteLocation(deletedVid, loc)
 				}
+				for _, newEcVid := range resp.VolumeLocation.NewEcVids {
+					glog.V(1).Infof("%s: %s masterClient adds ec volume %d", mc.clientType, loc.Url, newEcVid)
+					mc.addEcLocation(newEcVid, loc)
+				}
+				for _, deletedEcVid := range resp.VolumeLocation.DeletedEcVids {
+					glog.V(1).Infof("%s: %s masterClient removes ec volume %d", mc.clientType, loc.Url, deletedEcVid)
+					mc.deleteEcLocation(deletedEcVid, loc)
+				}
 			}
 
 			if resp.ClusterNodeUpdate != nil {
diff --git a/weed/wdclient/vid_map.go b/weed/wdclient/vid_map.go
index 0effa2262..cdd783d91 100644
--- a/weed/wdclient/vid_map.go
+++ b/weed/wdclient/vid_map.go
@@ -36,16 +36,18 @@ func (l Location) ServerAddress() pb.ServerAddress {
 
 type vidMap struct {
 	sync.RWMutex
-	vid2Locations map[uint32][]Location
-	DataCenter    string
-	cursor        int32
+	vid2Locations   map[uint32][]Location
+	ecVid2Locations map[uint32][]Location
+	DataCenter      string
+	cursor          int32
 }
 
 func newVidMap(dataCenter string) vidMap {
 	return vidMap{
-		vid2Locations: make(map[uint32][]Location),
-		DataCenter:    dataCenter,
-		cursor:        -1,
+		vid2Locations:   make(map[uint32][]Location),
+		ecVid2Locations: make(map[uint32][]Location),
+		DataCenter:      dataCenter,
+		cursor:          -1,
 	}
 }
 
@@ -124,7 +126,13 @@ func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
 	vc.RLock()
 	defer vc.RUnlock()
 
+	glog.V(4).Infof("~ lookup volume id %d: %+v ec:%+v", vid, vc.vid2Locations, vc.ecVid2Locations)
+
 	locations, found = vc.vid2Locations[vid]
+	if found && len(locations) > 0 {
+		return
+	}
+	locations, found = vc.ecVid2Locations[vid]
 	return
 }
 
@@ -132,6 +140,8 @@ func (vc *vidMap) addLocation(vid uint32, location Location) {
 	vc.Lock()
 	defer vc.Unlock()
 
+	glog.V(4).Infof("+ volume id %d: %+v", vid, location)
+
 	locations, found := vc.vid2Locations[vid]
 	if !found {
 		vc.vid2Locations[vid] = []Location{location}
@@ -148,10 +158,34 @@ func (vc *vidMap) addLocation(vid uint32, location Location) {
 
 }
 
+func (vc *vidMap) addEcLocation(vid uint32, location Location) {
+	vc.Lock()
+	defer vc.Unlock()
+
+	glog.V(4).Infof("+ ec volume id %d: %+v", vid, location)
+
+	locations, found := vc.ecVid2Locations[vid]
+	if !found {
+		vc.ecVid2Locations[vid] = []Location{location}
+		return
+	}
+
+	for _, loc := range locations {
+		if loc.Url == location.Url {
+			return
+		}
+	}
+
+	vc.ecVid2Locations[vid] = append(locations, location)
+
+}
+
 func (vc *vidMap) deleteLocation(vid uint32, location Location) {
 	vc.Lock()
 	defer vc.Unlock()
 
+	glog.V(4).Infof("- volume id %d: %+v", vid, location)
+
 	locations, found := vc.vid2Locations[vid]
 	if !found {
 		return
@@ -165,3 +199,23 @@ func (vc *vidMap) deleteLocation(vid uint32, location Location) {
 	}
 
 }
+
+func (vc *vidMap) deleteEcLocation(vid uint32, location Location) {
+	vc.Lock()
+	defer vc.Unlock()
+
+	glog.V(4).Infof("- ec volume id %d: %+v", vid, location)
+
+	locations, found := vc.ecVid2Locations[vid]
+	if !found {
+		return
+	}
+
+	for i, loc := range locations {
+		if loc.Url == location.Url {
+			vc.ecVid2Locations[vid] = append(locations[0:i], locations[i+1:]...)
+			break
+		}
+	}
+
+}