ec: dynamically discover disk types from topology for evacuation

Disk types are free-form tags (e.g., 'ssd', 'nvme', 'archive') that come
from the topology, not a hardcoded set. Only 'hdd' (or empty) is the
default disk type.

Use collectVolumeDiskTypes() to discover all disk types present in the
cluster topology instead of hardcoding [HardDriveType, SsdType].

test/erasure_coding/ec_integration_test.go

@@ -1282,7 +1282,7 @@ func TestECDiskTypeSupport(t *testing.T) {
 		args := []string{
 			"-collection", "ssd_test",
 			"-sourceDiskType", "ssd", // Filter source volumes by SSD
-			"-diskType", "ssd",       // Place EC shards on SSD
+			"-diskType", "ssd", // Place EC shards on SSD
 			"-force",
 		}
 

weed/shell/command_volume_server_evacuate.go

@@ -156,12 +156,13 @@ func (c *commandVolumeServerEvacuate) evacuateNormalVolumes(commandEnv *CommandE
 }
 
 func (c *commandVolumeServerEvacuate) evacuateEcVolumes(commandEnv *CommandEnv, volumeServer string, skipNonMoveable, applyChange bool, writer io.Writer) error {
-	// Evacuate EC volumes for all disk types
+	// Evacuate EC volumes for all disk types discovered from topology
+	// Disk types are free-form tags (e.g., "", "hdd", "ssd", "nvme", etc.)
 	// We need to handle each disk type separately because shards should be moved to nodes with the same disk type
 	// We collect topology once at the start and track capacity changes ourselves
 	// (via freeEcSlot decrement after each move) rather than repeatedly refreshing,
 	// which would give a false sense of correctness since topology could be stale.
-	diskTypes := []types.DiskType{types.HardDriveType, types.SsdType}
+	diskTypes := collectVolumeDiskTypes(c.topologyInfo)
 
 	for _, diskType := range diskTypes {
 		ecNodes, _ := collectEcVolumeServersByDc(c.topologyInfo, "", diskType)