tier storage: support downloading the remote dat files

11 files changed, 775 insertions, 256 deletions

diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index 1ea358f35..9e758ffbe 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -70,7 +70,9 @@ service VolumeServer {
     }
 
     // tiered storage
-    rpc VolumeTierCopyDatToRemote (VolumeTierCopyDatToRemoteRequest) returns (stream VolumeTierCopyDatToRemoteResponse) {
+    rpc VolumeTierMoveDatToRemote (VolumeTierMoveDatToRemoteRequest) returns (stream VolumeTierMoveDatToRemoteResponse) {
+    }
+    rpc VolumeTierMoveDatFromRemote (VolumeTierMoveDatFromRemoteRequest) returns (stream VolumeTierMoveDatFromRemoteResponse) {
     }
 
     // query
@@ -352,13 +354,23 @@ message VolumeTierInfo {
     repeated RemoteFile files = 1;
 }
 
-message VolumeTierCopyDatToRemoteRequest {
+message VolumeTierMoveDatToRemoteRequest {
     uint32 volume_id = 1;
     string collection = 2;
     string destination_backend_name = 3;
     bool keep_local_dat_file = 4;
 }
-message VolumeTierCopyDatToRemoteResponse {
+message VolumeTierMoveDatToRemoteResponse {
+    int64 processed = 1;
+    float processedPercentage = 2;
+}
+
+message VolumeTierMoveDatFromRemoteRequest {
+    uint32 volume_id = 1;
+    string collection = 2;
+    bool keep_remote_dat_file = 3;
+}
+message VolumeTierMoveDatFromRemoteResponse {
     int64 processed = 1;
     float processedPercentage = 2;
 }
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 7afd8031e..ff9fa690a 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -69,8 +69,10 @@ It has these top-level messages:
 	MemStatus
 	RemoteFile
 	VolumeTierInfo
-	VolumeTierCopyDatToRemoteRequest
-	VolumeTierCopyDatToRemoteResponse
+	VolumeTierMoveDatToRemoteRequest
+	VolumeTierMoveDatToRemoteResponse
+	VolumeTierMoveDatFromRemoteRequest
+	VolumeTierMoveDatFromRemoteResponse
 	QueryRequest
 	QueriedStripe
 */
@@ -1521,68 +1523,128 @@ func (m *VolumeTierInfo) GetFiles() []*RemoteFile {
 	return nil
 }
 
-type VolumeTierCopyDatToRemoteRequest struct {
+type VolumeTierMoveDatToRemoteRequest struct {
 	VolumeId               uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	Collection             string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
 	DestinationBackendName string `protobuf:"bytes,3,opt,name=destination_backend_name,json=destinationBackendName" json:"destination_backend_name,omitempty"`
 	KeepLocalDatFile       bool   `protobuf:"varint,4,opt,name=keep_local_dat_file,json=keepLocalDatFile" json:"keep_local_dat_file,omitempty"`
 }
 
-func (m *VolumeTierCopyDatToRemoteRequest) Reset()         { *m = VolumeTierCopyDatToRemoteRequest{} }
-func (m *VolumeTierCopyDatToRemoteRequest) String() string { return proto.CompactTextString(m) }
-func (*VolumeTierCopyDatToRemoteRequest) ProtoMessage()    {}
-func (*VolumeTierCopyDatToRemoteRequest) Descriptor() ([]byte, []int) {
+func (m *VolumeTierMoveDatToRemoteRequest) Reset()         { *m = VolumeTierMoveDatToRemoteRequest{} }
+func (m *VolumeTierMoveDatToRemoteRequest) String() string { return proto.CompactTextString(m) }
+func (*VolumeTierMoveDatToRemoteRequest) ProtoMessage()    {}
+func (*VolumeTierMoveDatToRemoteRequest) Descriptor() ([]byte, []int) {
 	return fileDescriptor0, []int{60}
 }
 
-func (m *VolumeTierCopyDatToRemoteRequest) GetVolumeId() uint32 {
+func (m *VolumeTierMoveDatToRemoteRequest) GetVolumeId() uint32 {
 	if m != nil {
 		return m.VolumeId
 	}
 	return 0
 }
 
-func (m *VolumeTierCopyDatToRemoteRequest) GetCollection() string {
+func (m *VolumeTierMoveDatToRemoteRequest) GetCollection() string {
 	if m != nil {
 		return m.Collection
 	}
 	return ""
 }
 
-func (m *VolumeTierCopyDatToRemoteRequest) GetDestinationBackendName() string {
+func (m *VolumeTierMoveDatToRemoteRequest) GetDestinationBackendName() string {
 	if m != nil {
 		return m.DestinationBackendName
 	}
 	return ""
 }
 
-func (m *VolumeTierCopyDatToRemoteRequest) GetKeepLocalDatFile() bool {
+func (m *VolumeTierMoveDatToRemoteRequest) GetKeepLocalDatFile() bool {
 	if m != nil {
 		return m.KeepLocalDatFile
 	}
 	return false
 }
 
-type VolumeTierCopyDatToRemoteResponse struct {
+type VolumeTierMoveDatToRemoteResponse struct {
 	Processed           int64   `protobuf:"varint,1,opt,name=processed" json:"processed,omitempty"`
 	ProcessedPercentage float32 `protobuf:"fixed32,2,opt,name=processedPercentage" json:"processedPercentage,omitempty"`
 }
 
-func (m *VolumeTierCopyDatToRemoteResponse) Reset()         { *m = VolumeTierCopyDatToRemoteResponse{} }
-func (m *VolumeTierCopyDatToRemoteResponse) String() string { return proto.CompactTextString(m) }
-func (*VolumeTierCopyDatToRemoteResponse) ProtoMessage()    {}
-func (*VolumeTierCopyDatToRemoteResponse) Descriptor() ([]byte, []int) {
+func (m *VolumeTierMoveDatToRemoteResponse) Reset()         { *m = VolumeTierMoveDatToRemoteResponse{} }
+func (m *VolumeTierMoveDatToRemoteResponse) String() string { return proto.CompactTextString(m) }
+func (*VolumeTierMoveDatToRemoteResponse) ProtoMessage()    {}
+func (*VolumeTierMoveDatToRemoteResponse) Descriptor() ([]byte, []int) {
 	return fileDescriptor0, []int{61}
 }
 
-func (m *VolumeTierCopyDatToRemoteResponse) GetProcessed() int64 {
+func (m *VolumeTierMoveDatToRemoteResponse) GetProcessed() int64 {
 	if m != nil {
 		return m.Processed
 	}
 	return 0
 }
 
-func (m *VolumeTierCopyDatToRemoteResponse) GetProcessedPercentage() float32 {
+func (m *VolumeTierMoveDatToRemoteResponse) GetProcessedPercentage() float32 {
+	if m != nil {
+		return m.ProcessedPercentage
+	}
+	return 0
+}
+
+type VolumeTierMoveDatFromRemoteRequest struct {
+	VolumeId          uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
+	Collection        string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	KeepRemoteDatFile bool   `protobuf:"varint,3,opt,name=keep_remote_dat_file,json=keepRemoteDatFile" json:"keep_remote_dat_file,omitempty"`
+}
+
+func (m *VolumeTierMoveDatFromRemoteRequest) Reset()         { *m = VolumeTierMoveDatFromRemoteRequest{} }
+func (m *VolumeTierMoveDatFromRemoteRequest) String() string { return proto.CompactTextString(m) }
+func (*VolumeTierMoveDatFromRemoteRequest) ProtoMessage()    {}
+func (*VolumeTierMoveDatFromRemoteRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor0, []int{62}
+}
+
+func (m *VolumeTierMoveDatFromRemoteRequest) GetVolumeId() uint32 {
+	if m != nil {
+		return m.VolumeId
+	}
+	return 0
+}
+
+func (m *VolumeTierMoveDatFromRemoteRequest) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+func (m *VolumeTierMoveDatFromRemoteRequest) GetKeepRemoteDatFile() bool {
+	if m != nil {
+		return m.KeepRemoteDatFile
+	}
+	return false
+}
+
+type VolumeTierMoveDatFromRemoteResponse struct {
+	Processed           int64   `protobuf:"varint,1,opt,name=processed" json:"processed,omitempty"`
+	ProcessedPercentage float32 `protobuf:"fixed32,2,opt,name=processedPercentage" json:"processedPercentage,omitempty"`
+}
+
+func (m *VolumeTierMoveDatFromRemoteResponse) Reset()         { *m = VolumeTierMoveDatFromRemoteResponse{} }
+func (m *VolumeTierMoveDatFromRemoteResponse) String() string { return proto.CompactTextString(m) }
+func (*VolumeTierMoveDatFromRemoteResponse) ProtoMessage()    {}
+func (*VolumeTierMoveDatFromRemoteResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor0, []int{63}
+}
+
+func (m *VolumeTierMoveDatFromRemoteResponse) GetProcessed() int64 {
+	if m != nil {
+		return m.Processed
+	}
+	return 0
+}
+
+func (m *VolumeTierMoveDatFromRemoteResponse) GetProcessedPercentage() float32 {
 	if m != nil {
 		return m.ProcessedPercentage
 	}
@@ -1601,7 +1663,7 @@ type QueryRequest struct {
 func (m *QueryRequest) Reset()                    { *m = QueryRequest{} }
 func (m *QueryRequest) String() string            { return proto.CompactTextString(m) }
 func (*QueryRequest) ProtoMessage()               {}
-func (*QueryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{62} }
+func (*QueryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{64} }
 
 func (m *QueryRequest) GetSelections() []string {
 	if m != nil {
@@ -1647,7 +1709,7 @@ type QueryRequest_Filter struct {
 func (m *QueryRequest_Filter) Reset()                    { *m = QueryRequest_Filter{} }
 func (m *QueryRequest_Filter) String() string            { return proto.CompactTextString(m) }
 func (*QueryRequest_Filter) ProtoMessage()               {}
-func (*QueryRequest_Filter) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{62, 0} }
+func (*QueryRequest_Filter) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{64, 0} }
 
 func (m *QueryRequest_Filter) GetField() string {
 	if m != nil {
@@ -1682,7 +1744,7 @@ func (m *QueryRequest_InputSerialization) Reset()         { *m = QueryRequest_In
 func (m *QueryRequest_InputSerialization) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 1}
+	return fileDescriptor0, []int{64, 1}
 }
 
 func (m *QueryRequest_InputSerialization) GetCompressionType() string {
@@ -1730,7 +1792,7 @@ func (m *QueryRequest_InputSerialization_CSVInput) Reset() {
 func (m *QueryRequest_InputSerialization_CSVInput) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization_CSVInput) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization_CSVInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 1, 0}
+	return fileDescriptor0, []int{64, 1, 0}
 }
 
 func (m *QueryRequest_InputSerialization_CSVInput) GetFileHeaderInfo() string {
@@ -1792,7 +1854,7 @@ func (m *QueryRequest_InputSerialization_JSONInput) Reset() {
 func (m *QueryRequest_InputSerialization_JSONInput) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization_JSONInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 1, 1}
+	return fileDescriptor0, []int{64, 1, 1}
 }
 
 func (m *QueryRequest_InputSerialization_JSONInput) GetType() string {
@@ -1813,7 +1875,7 @@ func (m *QueryRequest_InputSerialization_ParquetInput) String() string {
 }
 func (*QueryRequest_InputSerialization_ParquetInput) ProtoMessage() {}
 func (*QueryRequest_InputSerialization_ParquetInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 1, 2}
+	return fileDescriptor0, []int{64, 1, 2}
 }
 
 type QueryRequest_OutputSerialization struct {
@@ -1825,7 +1887,7 @@ func (m *QueryRequest_OutputSerialization) Reset()         { *m = QueryRequest_O
 func (m *QueryRequest_OutputSerialization) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest_OutputSerialization) ProtoMessage()    {}
 func (*QueryRequest_OutputSerialization) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 2}
+	return fileDescriptor0, []int{64, 2}
 }
 
 func (m *QueryRequest_OutputSerialization) GetCsvOutput() *QueryRequest_OutputSerialization_CSVOutput {
@@ -1858,7 +1920,7 @@ func (m *QueryRequest_OutputSerialization_CSVOutput) String() string {
 }
 func (*QueryRequest_OutputSerialization_CSVOutput) ProtoMessage() {}
 func (*QueryRequest_OutputSerialization_CSVOutput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 2, 0}
+	return fileDescriptor0, []int{64, 2, 0}
 }
 
 func (m *QueryRequest_OutputSerialization_CSVOutput) GetQuoteFields() string {
@@ -1908,7 +1970,7 @@ func (m *QueryRequest_OutputSerialization_JSONOutput) String() string {
 }
 func (*QueryRequest_OutputSerialization_JSONOutput) ProtoMessage() {}
 func (*QueryRequest_OutputSerialization_JSONOutput) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{62, 2, 1}
+	return fileDescriptor0, []int{64, 2, 1}
 }
 
 func (m *QueryRequest_OutputSerialization_JSONOutput) GetRecordDelimiter() string {
@@ -1925,7 +1987,7 @@ type QueriedStripe struct {
 func (m *QueriedStripe) Reset()                    { *m = QueriedStripe{} }
 func (m *QueriedStripe) String() string            { return proto.CompactTextString(m) }
 func (*QueriedStripe) ProtoMessage()               {}
-func (*QueriedStripe) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{63} }
+func (*QueriedStripe) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{65} }
 
 func (m *QueriedStripe) GetRecords() []byte {
 	if m != nil {
@@ -1995,8 +2057,10 @@ func init() {
 	proto.RegisterType((*MemStatus)(nil), "volume_server_pb.MemStatus")
 	proto.RegisterType((*RemoteFile)(nil), "volume_server_pb.RemoteFile")
 	proto.RegisterType((*VolumeTierInfo)(nil), "volume_server_pb.VolumeTierInfo")
-	proto.RegisterType((*VolumeTierCopyDatToRemoteRequest)(nil), "volume_server_pb.VolumeTierCopyDatToRemoteRequest")
-	proto.RegisterType((*VolumeTierCopyDatToRemoteResponse)(nil), "volume_server_pb.VolumeTierCopyDatToRemoteResponse")
+	proto.RegisterType((*VolumeTierMoveDatToRemoteRequest)(nil), "volume_server_pb.VolumeTierMoveDatToRemoteRequest")
+	proto.RegisterType((*VolumeTierMoveDatToRemoteResponse)(nil), "volume_server_pb.VolumeTierMoveDatToRemoteResponse")
+	proto.RegisterType((*VolumeTierMoveDatFromRemoteRequest)(nil), "volume_server_pb.VolumeTierMoveDatFromRemoteRequest")
+	proto.RegisterType((*VolumeTierMoveDatFromRemoteResponse)(nil), "volume_server_pb.VolumeTierMoveDatFromRemoteResponse")
 	proto.RegisterType((*QueryRequest)(nil), "volume_server_pb.QueryRequest")
 	proto.RegisterType((*QueryRequest_Filter)(nil), "volume_server_pb.QueryRequest.Filter")
 	proto.RegisterType((*QueryRequest_InputSerialization)(nil), "volume_server_pb.QueryRequest.InputSerialization")
@@ -2051,7 +2115,8 @@ type VolumeServerClient interface {
 	VolumeEcBlobDelete(ctx context.Context, in *VolumeEcBlobDeleteRequest, opts ...grpc.CallOption) (*VolumeEcBlobDeleteResponse, error)
 	VolumeEcShardsToVolume(ctx context.Context, in *VolumeEcShardsToVolumeRequest, opts ...grpc.CallOption) (*VolumeEcShardsToVolumeResponse, error)
 	// tiered storage
-	VolumeTierCopyDatToRemote(ctx context.Context, in *VolumeTierCopyDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierCopyDatToRemoteClient, error)
+	VolumeTierMoveDatToRemote(ctx context.Context, in *VolumeTierMoveDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierMoveDatToRemoteClient, error)
+	VolumeTierMoveDatFromRemote(ctx context.Context, in *VolumeTierMoveDatFromRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierMoveDatFromRemoteClient, error)
 	// query
 	Query(ctx context.Context, in *QueryRequest, opts ...grpc.CallOption) (VolumeServer_QueryClient, error)
 }
@@ -2399,12 +2464,44 @@ func (c *volumeServerClient) VolumeEcShardsToVolume(ctx context.Context, in *Vol
 	return out, nil
 }
 
-func (c *volumeServerClient) VolumeTierCopyDatToRemote(ctx context.Context, in *VolumeTierCopyDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierCopyDatToRemoteClient, error) {
-	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[4], c.cc, "/volume_server_pb.VolumeServer/VolumeTierCopyDatToRemote", opts...)
+func (c *volumeServerClient) VolumeTierMoveDatToRemote(ctx context.Context, in *VolumeTierMoveDatToRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierMoveDatToRemoteClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[4], c.cc, "/volume_server_pb.VolumeServer/VolumeTierMoveDatToRemote", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &volumeServerVolumeTierMoveDatToRemoteClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type VolumeServer_VolumeTierMoveDatToRemoteClient interface {
+	Recv() (*VolumeTierMoveDatToRemoteResponse, error)
+	grpc.ClientStream
+}
+
+type volumeServerVolumeTierMoveDatToRemoteClient struct {
+	grpc.ClientStream
+}
+
+func (x *volumeServerVolumeTierMoveDatToRemoteClient) Recv() (*VolumeTierMoveDatToRemoteResponse, error) {
+	m := new(VolumeTierMoveDatToRemoteResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+func (c *volumeServerClient) VolumeTierMoveDatFromRemote(ctx context.Context, in *VolumeTierMoveDatFromRemoteRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTierMoveDatFromRemoteClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[5], c.cc, "/volume_server_pb.VolumeServer/VolumeTierMoveDatFromRemote", opts...)
 	if err != nil {
 		return nil, err
 	}
-	x := &volumeServerVolumeTierCopyDatToRemoteClient{stream}
+	x := &volumeServerVolumeTierMoveDatFromRemoteClient{stream}
 	if err := x.ClientStream.SendMsg(in); err != nil {
 		return nil, err
 	}
@@ -2414,17 +2511,17 @@ func (c *volumeServerClient) VolumeTierCopyDatToRemote(ctx context.Context, in *
 	return x, nil
 }
 
-type VolumeServer_VolumeTierCopyDatToRemoteClient interface {
-	Recv() (*VolumeTierCopyDatToRemoteResponse, error)
+type VolumeServer_VolumeTierMoveDatFromRemoteClient interface {
+	Recv() (*VolumeTierMoveDatFromRemoteResponse, error)
 	grpc.ClientStream
 }
 
-type volumeServerVolumeTierCopyDatToRemoteClient struct {
+type volumeServerVolumeTierMoveDatFromRemoteClient struct {
 	grpc.ClientStream
 }
 
-func (x *volumeServerVolumeTierCopyDatToRemoteClient) Recv() (*VolumeTierCopyDatToRemoteResponse, error) {
-	m := new(VolumeTierCopyDatToRemoteResponse)
+func (x *volumeServerVolumeTierMoveDatFromRemoteClient) Recv() (*VolumeTierMoveDatFromRemoteResponse, error) {
+	m := new(VolumeTierMoveDatFromRemoteResponse)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
 	}
@@ -2432,7 +2529,7 @@ func (x *volumeServerVolumeTierCopyDatToRemoteClient) Recv() (*VolumeTierCopyDat
 }
 
 func (c *volumeServerClient) Query(ctx context.Context, in *QueryRequest, opts ...grpc.CallOption) (VolumeServer_QueryClient, error) {
-	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[5], c.cc, "/volume_server_pb.VolumeServer/Query", opts...)
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[6], c.cc, "/volume_server_pb.VolumeServer/Query", opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -2497,7 +2594,8 @@ type VolumeServerServer interface {
 	VolumeEcBlobDelete(context.Context, *VolumeEcBlobDeleteRequest) (*VolumeEcBlobDeleteResponse, error)
 	VolumeEcShardsToVolume(context.Context, *VolumeEcShardsToVolumeRequest) (*VolumeEcShardsToVolumeResponse, error)
 	// tiered storage
-	VolumeTierCopyDatToRemote(*VolumeTierCopyDatToRemoteRequest, VolumeServer_VolumeTierCopyDatToRemoteServer) error
+	VolumeTierMoveDatToRemote(*VolumeTierMoveDatToRemoteRequest, VolumeServer_VolumeTierMoveDatToRemoteServer) error
+	VolumeTierMoveDatFromRemote(*VolumeTierMoveDatFromRemoteRequest, VolumeServer_VolumeTierMoveDatFromRemoteServer) error
 	// query
 	Query(*QueryRequest, VolumeServer_QueryServer) error
 }
@@ -3004,24 +3102,45 @@ func _VolumeServer_VolumeEcShardsToVolume_Handler(srv interface{}, ctx context.C
 	return interceptor(ctx, in, info, handler)
 }
 
-func _VolumeServer_VolumeTierCopyDatToRemote_Handler(srv interface{}, stream grpc.ServerStream) error {
-	m := new(VolumeTierCopyDatToRemoteRequest)
+func _VolumeServer_VolumeTierMoveDatToRemote_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeTierMoveDatToRemoteRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(VolumeServerServer).VolumeTierMoveDatToRemote(m, &volumeServerVolumeTierMoveDatToRemoteServer{stream})
+}
+
+type VolumeServer_VolumeTierMoveDatToRemoteServer interface {
+	Send(*VolumeTierMoveDatToRemoteResponse) error
+	grpc.ServerStream
+}
+
+type volumeServerVolumeTierMoveDatToRemoteServer struct {
+	grpc.ServerStream
+}
+
+func (x *volumeServerVolumeTierMoveDatToRemoteServer) Send(m *VolumeTierMoveDatToRemoteResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func _VolumeServer_VolumeTierMoveDatFromRemote_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeTierMoveDatFromRemoteRequest)
 	if err := stream.RecvMsg(m); err != nil {
 		return err
 	}
-	return srv.(VolumeServerServer).VolumeTierCopyDatToRemote(m, &volumeServerVolumeTierCopyDatToRemoteServer{stream})
+	return srv.(VolumeServerServer).VolumeTierMoveDatFromRemote(m, &volumeServerVolumeTierMoveDatFromRemoteServer{stream})
 }
 
-type VolumeServer_VolumeTierCopyDatToRemoteServer interface {
-	Send(*VolumeTierCopyDatToRemoteResponse) error
+type VolumeServer_VolumeTierMoveDatFromRemoteServer interface {
+	Send(*VolumeTierMoveDatFromRemoteResponse) error
 	grpc.ServerStream
 }
 
-type volumeServerVolumeTierCopyDatToRemoteServer struct {
+type volumeServerVolumeTierMoveDatFromRemoteServer struct {
 	grpc.ServerStream
 }
 
-func (x *volumeServerVolumeTierCopyDatToRemoteServer) Send(m *VolumeTierCopyDatToRemoteResponse) error {
+func (x *volumeServerVolumeTierMoveDatFromRemoteServer) Send(m *VolumeTierMoveDatFromRemoteResponse) error {
 	return x.ServerStream.SendMsg(m)
 }
 
@@ -3165,8 +3284,13 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			ServerStreams: true,
 		},
 		{
-			StreamName:    "VolumeTierCopyDatToRemote",
-			Handler:       _VolumeServer_VolumeTierCopyDatToRemote_Handler,
+			StreamName:    "VolumeTierMoveDatToRemote",
+			Handler:       _VolumeServer_VolumeTierMoveDatToRemote_Handler,
+			ServerStreams: true,
+		},
+		{
+			StreamName:    "VolumeTierMoveDatFromRemote",
+			Handler:       _VolumeServer_VolumeTierMoveDatFromRemote_Handler,
 			ServerStreams: true,
 		},
 		{
@@ -3181,181 +3305,185 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 2811 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xd4, 0x3a, 0x4b, 0x73, 0xdc, 0xc6,
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-	0x41, 0x59, 0x71, 0x62, 0x57, 0x50, 0x43, 0x60, 0x56, 0x84, 0x09, 0x60, 0x20, 0x60, 0x96, 0xd6,
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+	0x0e, 0x93, 0x71, 0xad, 0x39, 0x41, 0x2a, 0xfe, 0xa9, 0xce, 0x4f, 0x85, 0xce, 0x4e, 0x7d, 0x7e,
+	0xaa, 0xee, 0x2f, 0x19, 0x57, 0x1b, 0xe3, 0x97, 0x43, 0x2f, 0xdb, 0x1e, 0xa9, 0xb7, 0x76, 0x45,
+	0xb7, 0xa8, 0xde, 0xda, 0x95, 0x1d, 0x17, 0x11, 0x1f, 0x55, 0xad, 0x8f, 0xaa, 0xf8, 0x38, 0xa4,
+	0x37, 0x63, 0xac, 0x37, 0x45, 0xcf, 0x1d, 0xdf, 0xe5, 0xde, 0x06, 0x9a, 0xb8, 0xfe, 0x5c, 0x66,
+	0xbe, 0xd2, 0x10, 0xbb, 0x7e, 0x77, 0x75, 0xa6, 0x9e, 0xa8, 0x40, 0x21, 0x63, 0x5f, 0x6d, 0x8c,
+	0x9f, 0xca, 0x8e, 0xf4, 0x4f, 0x13, 0x99, 0xbe, 0x04, 0xba, 0x3c, 0x81, 0x4f, 0xa6, 0xaf, 0x62,
+	0xbc, 0xda, 0x08, 0xb7, 0x2a, 0x7a, 0xb3, 0x9d, 0x82, 0xc3, 0xfc, 0xa9, 0xd4, 0xde, 0x38, 0xcc,
+	0x9f, 0x2a, 0x9a, 0x0f, 0x15, 0xd1, 0xab, 0x1b, 0x04, 0x93, 0xa3, 0xb7, 0xd0, 0xa8, 0x98, 0x1c,
+	0xbd, 0xa5, 0xde, 0xc3, 0x14, 0xfa, 0xe5, 0xb8, 0x99, 0x5e, 0x7e, 0x04, 0x44, 0x1b, 0xb5, 0xa9,
+	0xa8, 0xf6, 0xed, 0xd3, 0x78, 0xe3, 0x48, 0x34, 0x19, 0xe3, 0xff, 0xba, 0xa5, 0xbb, 0x77, 0x95,
+	0xaf, 0x70, 0xe8, 0xcd, 0x06, 0x8c, 0x4b, 0x0f, 0x89, 0xc6, 0x5b, 0x47, 0xa4, 0xca, 0x2c, 0xe8,
+	0x23, 0x98, 0x15, 0xd5, 0x27, 0x3a, 0x77, 0x78, 0x59, 0x6a, 0x9c, 0xaf, 0x9e, 0x4f, 0x8b, 0x2b,
+	0xce, 0x6d, 0x67, 0x4e, 0xfc, 0x36, 0xfb, 0xc6, 0x7f, 0x02, 0x00, 0x00, 0xff, 0xff, 0xb3, 0xd7,
+	0xc4, 0x53, 0x4d, 0x2b, 0x00, 0x00,
 }
diff --git a/weed/server/volume_grpc_tier_download.go b/weed/server/volume_grpc_tier_download.go
new file mode 100644
index 000000000..3c18e39ec
--- /dev/null
+++ b/weed/server/volume_grpc_tier_download.go
@@ -0,0 +1,85 @@
+package weed_server
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+)
+
+// VolumeTierMoveDatFromRemote copy dat file from a remote tier to local volume server
+func (vs *VolumeServer) VolumeTierMoveDatFromRemote(req *volume_server_pb.VolumeTierMoveDatFromRemoteRequest, stream volume_server_pb.VolumeServer_VolumeTierMoveDatFromRemoteServer) error {
+
+	// find existing volume
+	v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
+	if v == nil {
+		return fmt.Errorf("volume %d not found", req.VolumeId)
+	}
+
+	// verify the collection
+	if v.Collection != req.Collection {
+		return fmt.Errorf("existing collection:%v unexpected input: %v", v.Collection, req.Collection)
+	}
+
+	// locate the disk file
+	storageName, storageKey := v.RemoteStorageNameKey()
+	if storageName == "" || storageKey == "" {
+		return fmt.Errorf("volume %d is already on local disk", req.VolumeId)
+	}
+
+	// check whether the local .dat already exists
+	_, ok := v.DataBackend.(*backend.DiskFile)
+	if ok {
+		return fmt.Errorf("volume %d is already on local disk", req.VolumeId)
+	}
+
+	// check valid storage backend type
+	backendStorage, found := backend.BackendStorages[storageName]
+	if !found {
+		var keys []string
+		for key := range backend.BackendStorages {
+			keys = append(keys, key)
+		}
+		return fmt.Errorf("remote storage %s not found from suppported: %v", storageName, keys)
+	}
+
+	startTime := time.Now()
+	fn := func(progressed int64, percentage float32) error {
+		now := time.Now()
+		if now.Sub(startTime) < time.Second {
+			return nil
+		}
+		startTime = now
+		return stream.Send(&volume_server_pb.VolumeTierMoveDatFromRemoteResponse{
+			Processed:           progressed,
+			ProcessedPercentage: percentage,
+		})
+	}
+	// copy the data file
+	_, err := backendStorage.DownloadFile(v.FileName()+".dat", storageKey, fn)
+	if err != nil {
+		return fmt.Errorf("backend %s copy file %s: %v", storageName, v.FileName()+".dat", err)
+	}
+
+	if req.KeepRemoteDatFile {
+		return nil
+	}
+
+	// remove remote file
+	if err := backendStorage.DeleteFile(storageKey); err != nil {
+		return fmt.Errorf("volume %d fail to delete remote file %s: %v", v.Id, storageKey, err)
+	}
+
+	// forget remote file
+	v.GetVolumeTierInfo().Files = v.GetVolumeTierInfo().Files[1:]
+	if err := v.SaveVolumeTierInfo(); err != nil {
+		return fmt.Errorf("volume %d fail to save remote file info: %v", v.Id, err)
+	}
+
+	v.DataBackend.Close()
+	v.DataBackend = nil
+
+	return nil
+}
diff --git a/weed/server/volume_grpc_tier.go b/weed/server/volume_grpc_tier_upload.go
index ecf974642..ceb96349d 100644
--- a/weed/server/volume_grpc_tier.go
+++ b/weed/server/volume_grpc_tier_upload.go
@@ -10,8 +10,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 )
 
-// VolumeTierCopyDatToRemote copy dat file to a remote tier
-func (vs *VolumeServer) VolumeTierCopyDatToRemote(req *volume_server_pb.VolumeTierCopyDatToRemoteRequest, stream volume_server_pb.VolumeServer_VolumeTierCopyDatToRemoteServer) error {
+// VolumeTierMoveDatToRemote copy dat file to a remote tier
+func (vs *VolumeServer) VolumeTierMoveDatToRemote(req *volume_server_pb.VolumeTierMoveDatToRemoteRequest, stream volume_server_pb.VolumeServer_VolumeTierMoveDatToRemoteServer) error {
 
 	// find existing volume
 	v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
@@ -56,7 +56,7 @@ func (vs *VolumeServer) VolumeTierCopyDatToRemote(req *volume_server_pb.VolumeTi
 			return nil
 		}
 		startTime = now
-		return stream.Send(&volume_server_pb.VolumeTierCopyDatToRemoteResponse{
+		return stream.Send(&volume_server_pb.VolumeTierMoveDatToRemoteResponse{
 			Processed:           progressed,
 			ProcessedPercentage: percentage,
 		})
diff --git a/weed/shell/command_ec_decode.go b/weed/shell/command_ec_decode.go
index b49ab2c58..8ca035a8c 100644
--- a/weed/shell/command_ec_decode.go
+++ b/weed/shell/command_ec_decode.go
@@ -47,7 +47,7 @@ func (c *commandEcDecode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 	vid := needle.VolumeId(*volumeId)
 
 	// collect topology information
-	topologyInfo, err := collectTopologyInfoForEcDecode(ctx, commandEnv)
+	topologyInfo, err := collectTopologyInfo(ctx, commandEnv)
 	if err != nil {
 		return err
 	}
@@ -203,7 +203,7 @@ func collectEcShards(ctx context.Context, commandEnv *CommandEnv, nodeToEcIndexB
 
 }
 
-func collectTopologyInfoForEcDecode(ctx context.Context, commandEnv *CommandEnv) (topoInfo *master_pb.TopologyInfo, err error) {
+func collectTopologyInfo(ctx context.Context, commandEnv *CommandEnv) (topoInfo *master_pb.TopologyInfo, err error) {
 
 	var resp *master_pb.VolumeListResponse
 	err = commandEnv.MasterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
diff --git a/weed/shell/command_volume_tier_download.go b/weed/shell/command_volume_tier_download.go
new file mode 100644
index 000000000..3921f1449
--- /dev/null
+++ b/weed/shell/command_volume_tier_download.go
@@ -0,0 +1,167 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+
+	"google.golang.org/grpc"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+)
+
+func init() {
+	Commands = append(Commands, &commandVolumeTierDownload{})
+}
+
+type commandVolumeTierDownload struct {
+}
+
+func (c *commandVolumeTierDownload) Name() string {
+	return "volume.tier.download"
+}
+
+func (c *commandVolumeTierDownload) Help() string {
+	return `move the dat file of a volume to a remote tier
+
+	volume.tier.download [-collection=""]
+	volume.tier.download [-collection=""] -volumeId=<volume_id>
+
+	e.g.:
+	volume.tier.download -volumeId=7
+	volume.tier.download -volumeId=7
+
+	This command will download the dat file of a volume from a remote tier to a volume server in local cluster.
+
+`
+}
+
+func (c *commandVolumeTierDownload) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	tierCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	volumeId := tierCommand.Int("volumeId", 0, "the volume id")
+	collection := tierCommand.String("collection", "", "the collection name")
+	if err = tierCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	ctx := context.Background()
+	vid := needle.VolumeId(*volumeId)
+
+	// collect topology information
+	topologyInfo, err := collectTopologyInfo(ctx, commandEnv)
+	if err != nil {
+		return err
+	}
+
+	// volumeId is provided
+	if vid != 0 {
+		return doVolumeTierDownload(ctx, commandEnv, writer, *collection, vid)
+	}
+
+	// apply to all volumes in the collection
+	// reusing collectVolumeIdsForEcEncode for now
+	volumeIds := collectRemoteVolumes(topologyInfo, *collection)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("tier download volumes: %v\n", volumeIds)
+	for _, vid := range volumeIds {
+		if err = doVolumeTierDownload(ctx, commandEnv, writer, *collection, vid); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func collectRemoteVolumes(topoInfo *master_pb.TopologyInfo, selectedCollection string) (vids []needle.VolumeId) {
+
+	vidMap := make(map[uint32]bool)
+	eachDataNode(topoInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
+		for _, v := range dn.VolumeInfos {
+			if v.Collection == selectedCollection && v.RemoteStorageKey != "" && v.RemoteStorageName != "" {
+				vidMap[v.Id] = true
+			}
+		}
+	})
+
+	for vid := range vidMap {
+		vids = append(vids, needle.VolumeId(vid))
+	}
+
+	return
+}
+
+func doVolumeTierDownload(ctx context.Context, commandEnv *CommandEnv, writer io.Writer, collection string, vid needle.VolumeId) (err error) {
+	// find volume location
+	locations, found := commandEnv.MasterClient.GetLocations(uint32(vid))
+	if !found {
+		return fmt.Errorf("volume %d not found", vid)
+	}
+
+	// TODO parallelize this
+	for _, loc := range locations {
+		// copy the .dat file from remote tier to local
+		err = downloadDatFromRemoteTier(ctx, commandEnv.option.GrpcDialOption, writer, needle.VolumeId(vid), collection, loc.Url)
+		if err != nil {
+		return fmt.Errorf("download dat file for volume %d to %s: %v", vid, loc.Url, err)
+	}
+	}
+
+	return nil
+}
+
+func downloadDatFromRemoteTier(ctx context.Context, grpcDialOption grpc.DialOption, writer io.Writer, volumeId needle.VolumeId, collection string, targetVolumeServer string) error {
+
+	err := operation.WithVolumeServerClient(targetVolumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		stream, downloadErr := volumeServerClient.VolumeTierMoveDatFromRemote(ctx, &volume_server_pb.VolumeTierMoveDatFromRemoteRequest{
+			VolumeId:               uint32(volumeId),
+			Collection:             collection,
+		})
+
+		var lastProcessed int64
+		for {
+			resp, recvErr := stream.Recv()
+			if recvErr != nil {
+				if recvErr == io.EOF {
+					break
+				} else {
+					return recvErr
+				}
+			}
+
+			processingSpeed := float64(resp.Processed-lastProcessed) / 1024.0 / 1024.0
+
+			fmt.Fprintf(writer, "downloaded %.2f%%, %d bytes, %.2fMB/s\n", resp.ProcessedPercentage, resp.Processed, processingSpeed)
+
+			lastProcessed = resp.Processed
+		}
+		if downloadErr != nil {
+			return downloadErr
+		}
+
+		_, unmountErr := volumeServerClient.VolumeUnmount(ctx, &volume_server_pb.VolumeUnmountRequest{
+			VolumeId: uint32(volumeId),
+		})
+		if unmountErr != nil {
+			return unmountErr
+		}
+
+		_, mountErr := volumeServerClient.VolumeMount(ctx, &volume_server_pb.VolumeMountRequest{
+			VolumeId: uint32(volumeId),
+		})
+		if mountErr != nil {
+			return mountErr
+		}
+
+		return nil
+	})
+
+	return err
+
+}
diff --git a/weed/shell/command_volume_tier.go b/weed/shell/command_volume_tier_upload.go
index de923d5a8..b3a0d9fe8 100644
--- a/weed/shell/command_volume_tier.go
+++ b/weed/shell/command_volume_tier_upload.go
@@ -7,24 +7,25 @@ import (
 	"io"
 	"time"
 
+	"google.golang.org/grpc"
+
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
-	"google.golang.org/grpc"
 )
 
 func init() {
-	Commands = append(Commands, &commandVolumeTier{})
+	Commands = append(Commands, &commandVolumeTierUpload{})
 }
 
-type commandVolumeTier struct {
+type commandVolumeTierUpload struct {
 }
 
-func (c *commandVolumeTier) Name() string {
+func (c *commandVolumeTierUpload) Name() string {
 	return "volume.tier.upload"
 }
 
-func (c *commandVolumeTier) Help() string {
+func (c *commandVolumeTierUpload) Help() string {
 	return `move the dat file of a volume to a remote tier
 
 	volume.tier.upload [-collection=""] [-fullPercent=95] [-quietFor=1h]
@@ -53,7 +54,7 @@ func (c *commandVolumeTier) Help() string {
 `
 }
 
-func (c *commandVolumeTier) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+func (c *commandVolumeTierUpload) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
 
 	tierCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	volumeId := tierCommand.Int("volumeId", 0, "the volume id")
@@ -71,7 +72,7 @@ func (c *commandVolumeTier) Do(args []string, commandEnv *CommandEnv, writer io.
 
 	// volumeId is provided
 	if vid != 0 {
-		return doVolumeTier(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile)
+		return doVolumeTierUpload(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile)
 	}
 
 	// apply to all volumes in the collection
@@ -80,9 +81,9 @@ func (c *commandVolumeTier) Do(args []string, commandEnv *CommandEnv, writer io.
 	if err != nil {
 		return err
 	}
-	fmt.Printf("tiering volumes: %v\n", volumeIds)
+	fmt.Printf("tier upload volumes: %v\n", volumeIds)
 	for _, vid := range volumeIds {
-		if err = doVolumeTier(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile); err != nil {
+		if err = doVolumeTierUpload(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile); err != nil {
 			return err
 		}
 	}
@@ -90,23 +91,20 @@ func (c *commandVolumeTier) Do(args []string, commandEnv *CommandEnv, writer io.
 	return nil
 }
 
-func doVolumeTier(ctx context.Context, commandEnv *CommandEnv, writer io.Writer, collection string, vid needle.VolumeId, dest string, keepLocalDatFile bool) (err error) {
+func doVolumeTierUpload(ctx context.Context, commandEnv *CommandEnv, writer io.Writer, collection string, vid needle.VolumeId, dest string, keepLocalDatFile bool) (err error) {
 	// find volume location
 	locations, found := commandEnv.MasterClient.GetLocations(uint32(vid))
 	if !found {
 		return fmt.Errorf("volume %d not found", vid)
 	}
 
-	// mark the volume as readonly
-	/*
-		err = markVolumeReadonly(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), locations)
-		if err != nil {
-			return fmt.Errorf("mark volume %d as readonly on %s: %v", vid, locations[0].Url, err)
-		}
-	*/
+	err = markVolumeReadonly(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), locations)
+	if err != nil {
+		return fmt.Errorf("mark volume %d as readonly on %s: %v", vid, locations[0].Url, err)
+	}
 
 	// copy the .dat file to remote tier
-	err = copyDatToRemoteTier(ctx, commandEnv.option.GrpcDialOption, writer, needle.VolumeId(vid), collection, locations[0].Url, dest, keepLocalDatFile)
+	err = uploadDatToRemoteTier(ctx, commandEnv.option.GrpcDialOption, writer, needle.VolumeId(vid), collection, locations[0].Url, dest, keepLocalDatFile)
 	if err != nil {
 		return fmt.Errorf("copy dat file for volume %d on %s to %s: %v", vid, locations[0].Url, dest, err)
 	}
@@ -114,10 +112,10 @@ func doVolumeTier(ctx context.Context, commandEnv *CommandEnv, writer io.Writer,
 	return nil
 }
 
-func copyDatToRemoteTier(ctx context.Context, grpcDialOption grpc.DialOption, writer io.Writer, volumeId needle.VolumeId, collection string, sourceVolumeServer string, dest string, keepLocalDatFile bool) error {
+func uploadDatToRemoteTier(ctx context.Context, grpcDialOption grpc.DialOption, writer io.Writer, volumeId needle.VolumeId, collection string, sourceVolumeServer string, dest string, keepLocalDatFile bool) error {
 
 	err := operation.WithVolumeServerClient(sourceVolumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
-		stream, copyErr := volumeServerClient.VolumeTierCopyDatToRemote(ctx, &volume_server_pb.VolumeTierCopyDatToRemoteRequest{
+		stream, copyErr := volumeServerClient.VolumeTierMoveDatToRemote(ctx, &volume_server_pb.VolumeTierMoveDatToRemoteRequest{
 			VolumeId:               uint32(volumeId),
 			Collection:             collection,
 			DestinationBackendName: dest,
diff --git a/weed/storage/backend/backend.go b/weed/storage/backend/backend.go
index 2f878110d..e041fd1d7 100644
--- a/weed/storage/backend/backend.go
+++ b/weed/storage/backend/backend.go
@@ -25,6 +25,8 @@ type BackendStorage interface {
 	ToProperties() map[string]string
 	NewStorageFile(key string, tierInfo *volume_server_pb.VolumeTierInfo) BackendStorageFile
 	CopyFile(f *os.File, fn func(progressed int64, percentage float32) error) (key string, size int64, err error)
+	DownloadFile(fileName string, key string, fn func(progressed int64, percentage float32) error) (size int64, err error)
+	DeleteFile(key string) (err error)
 }
 
 type StringProperties interface {
@@ -41,6 +43,7 @@ var (
 	BackendStorages         = make(map[string]BackendStorage)
 )
 
+// used by master to load remote storage configurations
 func LoadConfiguration(config *viper.Viper) {
 
 	StorageBackendPrefix := "storage.backend"
@@ -70,6 +73,7 @@ func LoadConfiguration(config *viper.Viper) {
 
 }
 
+// used by volume server to receive remote storage configurations from master
 func LoadFromPbStorageBackends(storageBackends []*master_pb.StorageBackend) {
 
 	for _, storageBackend := range storageBackends {
diff --git a/weed/storage/backend/s3_backend/s3_backend.go b/weed/storage/backend/s3_backend/s3_backend.go
index 458111f09..30f95c319 100644
--- a/weed/storage/backend/s3_backend/s3_backend.go
+++ b/weed/storage/backend/s3_backend/s3_backend.go
@@ -9,10 +9,11 @@ import (
 
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/aws/aws-sdk-go/service/s3/s3iface"
+	"github.com/google/uuid"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
-	"github.com/google/uuid"
 )
 
 func init() {
@@ -85,6 +86,24 @@ func (s *S3BackendStorage) CopyFile(f *os.File, fn func(progressed int64, percen
 	return
 }
 
+func (s *S3BackendStorage) DownloadFile(fileName string, key string, fn func(progressed int64, percentage float32) error) (size int64, err error) {
+
+	glog.V(1).Infof("download dat file of %s from remote s3.%s as %s", fileName, s.id, key)
+
+	size, err = downloadFromS3(s.conn, fileName, s.bucket, key, fn)
+
+	return
+}
+
+func (s *S3BackendStorage) DeleteFile(key string) (err error) {
+
+	glog.V(1).Infof("delete dat file %s from remote", key)
+
+	err = deleteFromS3(s.conn, s.bucket, key)
+
+	return
+}
+
 type S3BackendStorageFile struct {
 	backendStorage *S3BackendStorage
 	key            string
diff --git a/weed/storage/backend/s3_backend/s3_download.go b/weed/storage/backend/s3_backend/s3_download.go
new file mode 100644
index 000000000..f319ee691
--- /dev/null
+++ b/weed/storage/backend/s3_backend/s3_download.go
@@ -0,0 +1,98 @@
+package s3_backend
+
+import (
+	"fmt"
+	"os"
+	"sync/atomic"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/aws/aws-sdk-go/service/s3/s3iface"
+	"github.com/aws/aws-sdk-go/service/s3/s3manager"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func downloadFromS3(sess s3iface.S3API, destFileName string, sourceBucket string, sourceKey string,
+	fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {
+
+	fileSize, err = getFileSize(sess, sourceBucket, sourceKey)
+	if err != nil {
+		return
+	}
+
+	//open the file
+	f, err := os.OpenFile(destFileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return 0, fmt.Errorf("failed to open file %q, %v", destFileName, err)
+	}
+	defer f.Close()
+
+	// Create a downloader with the session and custom options
+	downloader := s3manager.NewDownloaderWithClient(sess, func(u *s3manager.Downloader) {
+		u.PartSize = int64(64 * 1024 * 1024)
+		u.Concurrency = 5
+	})
+
+	fileWriter := &s3DownloadProgressedWriter{
+		fp:      f,
+		size:    fileSize,
+		written: 0,
+		fn:      fn,
+	}
+
+	// Download the file from S3.
+	fileSize, err = downloader.Download(fileWriter,&s3.GetObjectInput{
+		Bucket: aws.String(sourceBucket),
+		Key:    aws.String(sourceKey),
+	})
+	if err != nil {
+		return fileSize, fmt.Errorf("failed to download file %s: %v", destFileName, err)
+	}
+
+	glog.V(1).Infof("downloaded file %s\n", destFileName)
+
+	return
+}
+
+// adapted from https://github.com/aws/aws-sdk-go/pull/1868
+// and https://petersouter.xyz/s3-download-progress-bar-in-golang/
+type s3DownloadProgressedWriter struct {
+	fp      *os.File
+	size    int64
+	written int64
+	fn      func(progressed int64, percentage float32) error
+}
+
+func (w *s3DownloadProgressedWriter) WriteAt(p []byte, off int64) (int, error) {
+	n, err := w.fp.WriteAt(p, off)
+	if err != nil {
+		return n, err
+	}
+
+	// Got the length have read( or means has uploaded), and you can construct your message
+	atomic.AddInt64(&w.written, int64(n))
+
+	if w.fn != nil {
+		written := w.written
+		if err := w.fn(written, float32(written*100)/float32(w.size)); err != nil {
+			return n, err
+		}
+	}
+
+	return n, err
+}
+
+func getFileSize(svc s3iface.S3API, bucket string, key string) (filesize int64, error error) {
+	params := &s3.HeadObjectInput{
+		Bucket: aws.String(bucket),
+		Key:    aws.String(key),
+	}
+
+	resp, err := svc.HeadObject(params)
+	if err != nil {
+		return 0, err
+	}
+
+	return *resp.ContentLength, nil
+}
diff --git a/weed/storage/backend/s3_backend/s3_sessions.go b/weed/storage/backend/s3_backend/s3_sessions.go
index cd7b7ad47..52c6d0c1b 100644
--- a/weed/storage/backend/s3_backend/s3_sessions.go
+++ b/weed/storage/backend/s3_backend/s3_sessions.go
@@ -52,3 +52,11 @@ func createSession(awsAccessKeyId, awsSecretAccessKey, region string) (s3iface.S
 	return t, nil
 
 }
+
+func deleteFromS3(sess s3iface.S3API, sourceBucket string, sourceKey string) (err error) {
+	_, err = sess.DeleteObject(&s3.DeleteObjectInput{
+		Bucket: aws.String(sourceBucket),
+		Key:    aws.String(sourceKey),
+	})
+	return err
+}
\ No newline at end of file