Admin UI: include ec shard sizes into volume server info (#7071)

* show ec shards on dashboard, show max in its own column

* master collect shard size info

* master send shard size via VolumeList

* change to more efficient shard sizes slice

* include ec shard sizes into volume server info

* Eliminated Redundant gRPC Calls

* much more efficient

* Efficient Counting: bits.OnesCount32() uses CPU-optimized instructions to count set bits in O(1)

* avoid extra volume list call

* simplify

* preserve existing shard sizes

* avoid hard coded value

* Update weed/storage/erasure_coding/ec_volume_info.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/admin/dash/volume_management.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update ec_volume_info.go

* address comments

* avoid duplicated functions

* Update weed/admin/dash/volume_management.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* simplify

* refactoring

* fix compilation

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/weed/worker/tasks/erasure_coding/detection.go b/weed/worker/tasks/erasure_coding/detection.go
index 1122d2721..9cf87cdf6 100644
--- a/weed/worker/tasks/erasure_coding/detection.go
+++ b/weed/worker/tasks/erasure_coding/detection.go
@@ -168,19 +168,16 @@ func planECDestinations(activeTopology *topology.ActiveTopology, metric *types.V
 		}
 	}
 
-	// Determine minimum shard disk locations based on configuration
-	minTotalDisks := 4
-
 	// Get available disks for EC placement (include source node for EC)
 	availableDisks := activeTopology.GetAvailableDisks(topology.TaskTypeErasureCoding, "")
-	if len(availableDisks) < minTotalDisks {
-		return nil, fmt.Errorf("insufficient disks for EC placement: need %d, have %d", minTotalDisks, len(availableDisks))
+	if len(availableDisks) < erasure_coding.MinTotalDisks {
+		return nil, fmt.Errorf("insufficient disks for EC placement: need %d, have %d", erasure_coding.MinTotalDisks, len(availableDisks))
 	}
 
 	// Select best disks for EC placement with rack/DC diversity
 	selectedDisks := selectBestECDestinations(availableDisks, sourceRack, sourceDC, erasure_coding.TotalShardsCount)
-	if len(selectedDisks) < minTotalDisks {
-		return nil, fmt.Errorf("found %d disks, but could not find %d suitable destinations for EC placement", len(selectedDisks), minTotalDisks)
+	if len(selectedDisks) < erasure_coding.MinTotalDisks {
+		return nil, fmt.Errorf("found %d disks, but could not find %d suitable destinations for EC placement", len(selectedDisks), erasure_coding.MinTotalDisks)
 	}
 
 	var plans []*topology.DestinationPlan