diff --git a/README.md b/README.md
index 69857b524..8e73f811c 100644
--- a/README.md
+++ b/README.md
@@ -121,15 +121,16 @@ On top of the object store, optional [Filer] can support directories and POSIX a
 
 ## Filer Features ##
 * [Filer server][Filer] provides "normal" directories and files via http.
-* [Super Large Files][SuperLargeFiles] stores large or super large files in tens of TB.
+* [File TTL][FilerTTL] automatically expires file metadata and actual file data.
 * [Mount filer][Mount] reads and writes files directly as a local directory via FUSE.
+* [Filer Store Replication][FilerStoreReplication] enables HA for filer meta data stores.
 * [Active-Active Replication][ActiveActiveAsyncReplication] enables asynchronous one-way or two-way cross cluster continuous replication.
 * [Amazon S3 compatible API][AmazonS3API] accesses files with S3 tooling.
 * [Hadoop Compatible File System][Hadoop] accesses files from Hadoop/Spark/Flink/etc or even runs HBase.
 * [Async Replication To Cloud][BackupToCloud] has extremely fast local access and backups to Amazon S3, Google Cloud Storage, Azure, BackBlaze.
 * [WebDAV] accesses as a mapped drive on Mac and Windows, or from mobile devices.
 * [AES256-GCM Encrypted Storage][FilerDataEncryption] safely stores the encrypted data.
-* [File TTL][FilerTTL] automatically purges file metadata and actual file data.
+* [Super Large Files][SuperLargeFiles] stores large or super large files in tens of TB.
 * [Kubernetes CSI Driver][SeaweedFsCsiDriver] A Container Storage Interface (CSI) Driver. [![Docker Pulls](https://img.shields.io/docker/pulls/chrislusf/seaweedfs-csi-driver.svg?maxAge=4800)](https://hub.docker.com/r/chrislusf/seaweedfs-csi-driver/)
 
 [Filer]: https://github.com/chrislusf/seaweedfs/wiki/Directories-and-Files
@@ -146,6 +147,7 @@ On top of the object store, optional [Filer] can support directories and POSIX a
 [VolumeServerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Store-file-with-a-Time-To-Live
 [SeaweedFsCsiDriver]: https://github.com/seaweedfs/seaweedfs-csi-driver
 [ActiveActiveAsyncReplication]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Active-Active-cross-cluster-continuous-synchronization
+[FilerStoreReplication]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Store-Replication
 
 [Back to TOC](#table-of-contents)
 
diff --git a/go.mod b/go.mod
index 51c24bcf0..ab3da6f20 100644
--- a/go.mod
+++ b/go.mod
@@ -40,7 +40,7 @@ require (
 	github.com/json-iterator/go v1.1.10
 	github.com/karlseguin/ccache v2.0.3+incompatible
 	github.com/karlseguin/expect v1.0.1 // indirect
-	github.com/klauspost/compress v1.10.9
+	github.com/klauspost/compress v1.10.9 // indirect
 	github.com/klauspost/cpuid v1.2.1 // indirect
 	github.com/klauspost/crc32 v1.2.0
 	github.com/klauspost/reedsolomon v1.9.2
diff --git a/k8s/seaweedfs/Chart.yaml b/k8s/seaweedfs/Chart.yaml
index ee08dbec5..236751f4c 100644
--- a/k8s/seaweedfs/Chart.yaml
+++ b/k8s/seaweedfs/Chart.yaml
@@ -1,4 +1,4 @@
 apiVersion: v1
 description: SeaweedFS
 name: seaweedfs
-version: 2.11
\ No newline at end of file
+version: 2.13
\ No newline at end of file
diff --git a/k8s/seaweedfs/values.yaml b/k8s/seaweedfs/values.yaml
index 84048f3dc..3e5dd0dca 100644
--- a/k8s/seaweedfs/values.yaml
+++ b/k8s/seaweedfs/values.yaml
@@ -4,7 +4,7 @@ global:
   registry: ""
   repository: ""
   imageName: chrislusf/seaweedfs
-  imageTag: "2.11"
+  imageTag: "2.13"
   imagePullPolicy: IfNotPresent
   imagePullSecrets: imagepullsecret
   restartPolicy: Always
diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index f61b62fa3..c046e48f3 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -100,6 +100,7 @@ message Entry {
     map<string, bytes> extended = 5;
     bytes hard_link_id = 7;
     int32 hard_link_counter = 8; // only exists in hard link meta data
+    bytes content = 9; // if not empty, the file content
 }
 
 message FullEntry {
diff --git a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
index cec309b3e..14b32528e 100644
--- a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
+++ b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
@@ -193,6 +193,7 @@ public class SeaweedFileSystemStore {
             if (existingEntry != null) {
                 entry = FilerProto.Entry.newBuilder();
                 entry.mergeFrom(existingEntry);
+                entry.clearContent();
                 entry.getAttributesBuilder().setMtime(now);
                 LOG.debug("createFile merged entry path:{} entry:{} from:{}", path, entry, existingEntry);
                 writePosition = SeaweedRead.fileSize(existingEntry);
diff --git a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedInputStream.java b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedInputStream.java
index 8bda2e092..8e406206d 100644
--- a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedInputStream.java
+++ b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedInputStream.java
@@ -84,7 +84,13 @@ public class SeaweedInputStream extends FSInputStream {
             throw new IllegalArgumentException("requested read length is more than will fit after requested offset in buffer");
         }
 
-        long bytesRead = SeaweedRead.read(this.filerGrpcClient, this.visibleIntervalList, this.position, b, off, len, SeaweedRead.fileSize(entry));
+        long bytesRead = 0;
+        if (position+len < entry.getContent().size()) {
+            entry.getContent().copyTo(b, (int) position, (int) off, len);
+        } else {
+            bytesRead = SeaweedRead.read(this.filerGrpcClient, this.visibleIntervalList, this.position, b, off, len, SeaweedRead.fileSize(entry));
+        }
+
         if (bytesRead > Integer.MAX_VALUE) {
             throw new IOException("Unexpected Content-Length");
         }
diff --git a/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java b/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
index 1ad809f9a..2ef1a7468 100644
--- a/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
+++ b/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
@@ -193,6 +193,7 @@ public class SeaweedFileSystemStore {
             if (existingEntry != null) {
                 entry = FilerProto.Entry.newBuilder();
                 entry.mergeFrom(existingEntry);
+                entry.clearContent();
                 entry.getAttributesBuilder().setMtime(now);
                 LOG.debug("createFile merged entry path:{} entry:{} from:{}", path, entry, existingEntry);
                 writePosition = SeaweedRead.fileSize(existingEntry);
diff --git a/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedInputStream.java b/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedInputStream.java
index 8bda2e092..8e406206d 100644
--- a/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedInputStream.java
+++ b/other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedInputStream.java
@@ -84,7 +84,13 @@ public class SeaweedInputStream extends FSInputStream {
             throw new IllegalArgumentException("requested read length is more than will fit after requested offset in buffer");
         }
 
-        long bytesRead = SeaweedRead.read(this.filerGrpcClient, this.visibleIntervalList, this.position, b, off, len, SeaweedRead.fileSize(entry));
+        long bytesRead = 0;
+        if (position+len < entry.getContent().size()) {
+            entry.getContent().copyTo(b, (int) position, (int) off, len);
+        } else {
+            bytesRead = SeaweedRead.read(this.filerGrpcClient, this.visibleIntervalList, this.position, b, off, len, SeaweedRead.fileSize(entry));
+        }
+
         if (bytesRead > Integer.MAX_VALUE) {
             throw new IOException("Unexpected Content-Length");
         }
diff --git a/other/metrics/grafana_seaweedfs.json b/other/metrics/grafana_seaweedfs.json
index d492a0695..074a3531f 100644
--- a/other/metrics/grafana_seaweedfs.json
+++ b/other/metrics/grafana_seaweedfs.json
@@ -386,7 +386,7 @@
           "steppedLine": false,
           "targets": [
             {
-              "expr": "rate(SeaweedFS_filer_request_total[1m]) * 5",
+              "expr": "rate(SeaweedFS_filer_request_total[1m])",
               "format": "time_series",
               "intervalFactor": 2,
               "legendFormat": "{{type}}",
@@ -761,7 +761,7 @@
           "steppedLine": false,
           "targets": [
             {
-              "expr": "rate(SeaweedFS_s3_request_total[1m]) * 5",
+              "expr": "rate(SeaweedFS_s3_request_total[1m])",
               "format": "time_series",
               "intervalFactor": 2,
               "legendFormat": "{{type}}",
@@ -1853,4 +1853,4 @@
   "timezone": "browser",
   "title": "SeaweedFS",
   "version": 2
-}
\ No newline at end of file
+}
diff --git a/other/metrics/grafana_seaweedfs_k8s.json b/other/metrics/grafana_seaweedfs_k8s.json
index 6d89a4c34..348198e52 100644
--- a/other/metrics/grafana_seaweedfs_k8s.json
+++ b/other/metrics/grafana_seaweedfs_k8s.json
@@ -97,7 +97,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "sum(rate(SeaweedFS_s3_request_total{namespace=\"$namespace\",service=~\"$service-api\",type=~\"$method\"}[1m]) * 5) by (code)",
+          "expr": "sum(rate(SeaweedFS_s3_request_total{namespace=\"$namespace\",service=~\"$service-api\",type=~\"$method\"}[1m])) by (code)",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -210,7 +210,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "sum(rate(SeaweedFS_s3_request_total{namespace=\"$namespace\",service=~\"$service-api\"}[1m]) * 5) by (type)",
+          "expr": "sum(rate(SeaweedFS_s3_request_total{namespace=\"$namespace\",service=~\"$service-api\"}[1m])) by (type)",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -1014,7 +1014,7 @@
       "steppedLine": false,
       "targets": [
         {
-          "expr": "rate(SeaweedFS_filer_request_total{namespace=\"$namespace\",service=~\"$service-api\"}[1m]) * 5",
+          "expr": "rate(SeaweedFS_filer_request_total{namespace=\"$namespace\",service=~\"$service-api\"}[1m])",
           "format": "time_series",
           "interval": "",
           "intervalFactor": 2,
@@ -2359,4 +2359,4 @@
   "timezone": "browser",
   "title": "SeaweedFS",
   "version": 2
-}
\ No newline at end of file
+}
diff --git a/weed/command/backup.go b/weed/command/backup.go
index 950cbf68e..4c37c2763 100644
--- a/weed/command/backup.go
+++ b/weed/command/backup.go
@@ -112,7 +112,7 @@ func runBackup(cmd *Command, args []string) bool {
 			return true
 		}
 	}
-	v, err := storage.NewVolume(util.ResolvePath(*s.dir), *s.collection, vid, storage.NeedleMapInMemory, replication, ttl, 0, 0)
+	v, err := storage.NewVolume(util.ResolvePath(*s.dir), util.ResolvePath(*s.dir), *s.collection, vid, storage.NeedleMapInMemory, replication, ttl, 0, 0)
 	if err != nil {
 		fmt.Printf("Error creating or reading from volume %d: %v\n", vid, err)
 		return true
@@ -137,7 +137,7 @@ func runBackup(cmd *Command, args []string) bool {
 		// remove the old data
 		v.Destroy()
 		// recreate an empty volume
-		v, err = storage.NewVolume(util.ResolvePath(*s.dir), *s.collection, vid, storage.NeedleMapInMemory, replication, ttl, 0, 0)
+		v, err = storage.NewVolume(util.ResolvePath(*s.dir), util.ResolvePath(*s.dir), *s.collection, vid, storage.NeedleMapInMemory, replication, ttl, 0, 0)
 		if err != nil {
 			fmt.Printf("Error creating or reading from volume %d: %v\n", vid, err)
 			return true
diff --git a/weed/command/compact.go b/weed/command/compact.go
index 6117cf9f3..92e25f474 100644
--- a/weed/command/compact.go
+++ b/weed/command/compact.go
@@ -41,8 +41,7 @@ func runCompact(cmd *Command, args []string) bool {
 	preallocate := *compactVolumePreallocate * (1 << 20)
 
 	vid := needle.VolumeId(*compactVolumeId)
-	v, err := storage.NewVolume(util.ResolvePath(*compactVolumePath), *compactVolumeCollection, vid,
-		storage.NeedleMapInMemory, nil, nil, preallocate, 0)
+	v, err := storage.NewVolume(util.ResolvePath(*compactVolumePath), util.ResolvePath(*compactVolumePath), *compactVolumeCollection, vid, storage.NeedleMapInMemory, nil, nil, preallocate, 0)
 	if err != nil {
 		glog.Fatalf("Load Volume [ERROR] %s\n", err)
 	}
diff --git a/weed/command/server.go b/weed/command/server.go
index 4a9c2411a..0c6731eb2 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -105,6 +105,7 @@ func init() {
 	serverOptions.v.publicUrl = cmdServer.Flag.String("volume.publicUrl", "", "publicly accessible address")
 	serverOptions.v.preStopSeconds = cmdServer.Flag.Int("volume.preStopSeconds", 10, "number of seconds between stop send heartbeats and stop volume server")
 	serverOptions.v.pprof = cmdServer.Flag.Bool("volume.pprof", false, "enable pprof http handlers. precludes --memprofile and --cpuprofile")
+	serverOptions.v.idxFolder = cmdServer.Flag.String("volume.dir.idx", "", "directory to store .idx files")
 
 	s3Options.port = cmdServer.Flag.Int("s3.port", 8333, "s3 server http listen port")
 	s3Options.domainName = cmdServer.Flag.String("s3.domainName", "", "suffix of the host name in comma separated list, {bucket}.{domainName}")
diff --git a/weed/command/volume.go b/weed/command/volume.go
index ce5992665..9597e843a 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -39,6 +39,7 @@ type VolumeServerOptions struct {
 	publicPort            *int
 	folders               []string
 	folderMaxLimits       []int
+	idxFolder             *string
 	ip                    *string
 	publicUrl             *string
 	bindIp                *string
@@ -83,6 +84,7 @@ func init() {
 	v.fileSizeLimitMB = cmdVolume.Flag.Int("fileSizeLimitMB", 256, "limit file size to avoid out of memory")
 	v.pprof = cmdVolume.Flag.Bool("pprof", false, "enable pprof http handlers. precludes --memprofile and --cpuprofile")
 	v.metricsHttpPort = cmdVolume.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
+	v.idxFolder = cmdVolume.Flag.String("dir.idx", "", "directory to store .idx files")
 }
 
 var cmdVolume = &Command{
@@ -211,6 +213,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 	volumeServer := weed_server.NewVolumeServer(volumeMux, publicVolumeMux,
 		*v.ip, *v.port, *v.publicUrl,
 		v.folders, v.folderMaxLimits, v.minFreeSpacePercents,
+		*v.idxFolder,
 		volumeNeedleMapKind,
 		strings.Split(masters, ","), 5, *v.dataCenter, *v.rack,
 		v.whiteList,
diff --git a/weed/filer/entry.go b/weed/filer/entry.go
index 421e51432..d2f257967 100644
--- a/weed/filer/entry.go
+++ b/weed/filer/entry.go
@@ -40,6 +40,7 @@ type Entry struct {
 
 	HardLinkId      HardLinkId
 	HardLinkCounter int32
+	Content         []byte
 }
 
 func (entry *Entry) Size() uint64 {
@@ -66,6 +67,7 @@ func (entry *Entry) ToProtoEntry() *filer_pb.Entry {
 		Extended:        entry.Extended,
 		HardLinkId:      entry.HardLinkId,
 		HardLinkCounter: entry.HardLinkCounter,
+		Content:         entry.Content,
 	}
 }
 
@@ -98,6 +100,7 @@ func FromPbEntry(dir string, entry *filer_pb.Entry) *Entry {
 		Chunks:          entry.Chunks,
 		HardLinkId:      HardLinkId(entry.HardLinkId),
 		HardLinkCounter: entry.HardLinkCounter,
+		Content:         entry.Content,
 	}
 }
 
diff --git a/weed/filer/entry_codec.go b/weed/filer/entry_codec.go
index 884fb2670..1693b551e 100644
--- a/weed/filer/entry_codec.go
+++ b/weed/filer/entry_codec.go
@@ -18,6 +18,7 @@ func (entry *Entry) EncodeAttributesAndChunks() ([]byte, error) {
 		Extended:        entry.Extended,
 		HardLinkId:      entry.HardLinkId,
 		HardLinkCounter: entry.HardLinkCounter,
+		Content:         entry.Content,
 	}
 	return proto.Marshal(message)
 }
@@ -38,6 +39,7 @@ func (entry *Entry) DecodeAttributesAndChunks(blob []byte) error {
 
 	entry.HardLinkId = message.HardLinkId
 	entry.HardLinkCounter = message.HardLinkCounter
+	entry.Content = message.Content
 
 	return nil
 }
@@ -122,6 +124,9 @@ func EqualEntry(a, b *Entry) bool {
 	if a.HardLinkCounter != b.HardLinkCounter {
 		return false
 	}
+	if !bytes.Equal(a.Content, b.Content) {
+		return false
+	}
 	return true
 }
 
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 105c8e04f..8319212f1 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -238,6 +238,7 @@ func (f *Filer) CreateEntry(ctx context.Context, entry *Entry, o_excl bool, isFr
 
 func (f *Filer) UpdateEntry(ctx context.Context, oldEntry, entry *Entry) (err error) {
 	if oldEntry != nil {
+		entry.Attr.Crtime = oldEntry.Attr.Crtime
 		if oldEntry.IsDirectory() && !entry.IsDirectory() {
 			glog.Errorf("existing %s is a directory", entry.FullPath)
 			return fmt.Errorf("existing %s is a directory", entry.FullPath)
@@ -269,7 +270,7 @@ func (f *Filer) FindEntry(ctx context.Context, p util.FullPath) (entry *Entry, e
 	entry, err = f.Store.FindEntry(ctx, p)
 	if entry != nil && entry.TtlSec > 0 {
 		if entry.Crtime.Add(time.Duration(entry.TtlSec) * time.Second).Before(time.Now()) {
-			f.Store.DeleteEntry(ctx, p.Child(entry.Name()))
+			f.Store.DeleteOneEntry(ctx, entry)
 			return nil, filer_pb.ErrNotFound
 		}
 	}
@@ -303,7 +304,7 @@ func (f *Filer) doListDirectoryEntries(ctx context.Context, p util.FullPath, sta
 		lastFileName = entry.Name()
 		if entry.TtlSec > 0 {
 			if entry.Crtime.Add(time.Duration(entry.TtlSec) * time.Second).Before(time.Now()) {
-				f.Store.DeleteEntry(ctx, p.Child(entry.Name()))
+				f.Store.DeleteOneEntry(ctx, entry)
 				expiredCount++
 				continue
 			}
@@ -317,11 +318,3 @@ func (f *Filer) Shutdown() {
 	f.LocalMetaLogBuffer.Shutdown()
 	f.Store.Shutdown()
 }
-
-func (f *Filer) maybeDeleteHardLinks(hardLinkIds []HardLinkId) {
-	for _, hardLinkId := range hardLinkIds {
-		if err := f.Store.DeleteHardLink(context.Background(), hardLinkId); err != nil {
-			glog.Errorf("delete hard link id %d : %v", hardLinkId, err)
-		}
-	}
-}
diff --git a/weed/filer/filer_conf.go b/weed/filer/filer_conf.go
index 6aa0d2b87..0328fdbff 100644
--- a/weed/filer/filer_conf.go
+++ b/weed/filer/filer_conf.go
@@ -40,6 +40,10 @@ func (fc *FilerConf) loadFromFiler(filer *Filer) (err error) {
 		return
 	}
 
+	if len(entry.Content) > 0 {
+		return fc.LoadFromBytes(entry.Content)
+	}
+
 	return fc.loadFromChunks(filer, entry.Chunks)
 }
 
diff --git a/weed/filer/filer_conf_test.go b/weed/filer/filer_conf_test.go
index 91f006cda..ff868a3ec 100644
--- a/weed/filer/filer_conf_test.go
+++ b/weed/filer/filer_conf_test.go
@@ -22,7 +22,7 @@ func TestFilerConf(t *testing.T) {
 		},
 		{
 			LocationPrefix: "/buckets/",
-			Replication: "001",
+			Replication:    "001",
 		},
 	}}
 	fc.doLoadConf(conf)
diff --git a/weed/filer/filer_delete_entry.go b/weed/filer/filer_delete_entry.go
index 4415d45d9..b4f4e46ff 100644
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -3,6 +3,7 @@ package filer
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -22,7 +23,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 		return findErr
 	}
 
-	isCollection := f.isBucket(entry)
+	isDeleteCollection := f.isBucket(entry)
 
 	var chunks []*filer_pb.FileChunk
 	var hardLinkIds []HardLinkId
@@ -31,7 +32,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 		// delete the folder children, not including the folder itself
 		var dirChunks []*filer_pb.FileChunk
 		var dirHardLinkIds []HardLinkId
-		dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
+		dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isDeleteCollection, isFromOtherCluster, signatures)
 		if err != nil {
 			glog.V(0).Infof("delete directory %s: %v", p, err)
 			return fmt.Errorf("delete directory %s: %v", p, err)
@@ -46,7 +47,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 		return fmt.Errorf("delete file %s: %v", p, err)
 	}
 
-	if shouldDeleteChunks && !isCollection {
+	if shouldDeleteChunks && !isDeleteCollection {
 		f.DirectDeleteChunks(chunks)
 	}
 	// A case not handled:
@@ -55,10 +56,15 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 		f.maybeDeleteHardLinks(hardLinkIds)
 	}
 
-	if isCollection {
+	if isDeleteCollection {
 		collectionName := entry.Name()
 		f.doDeleteCollection(collectionName)
 		f.deleteBucket(collectionName)
+	} else {
+		parent, _ := p.DirAndName()
+		if err := f.removeEmptyParentFolder(ctx, util.FullPath(parent)); err != nil {
+			glog.Errorf("clean up empty folders for %s : %v", p, err)
+		}
 	}
 
 	return nil
@@ -122,7 +128,7 @@ func (f *Filer) doDeleteEntryMetaAndData(ctx context.Context, entry *Entry, shou
 
 	glog.V(3).Infof("deleting entry %v, delete chunks: %v", entry.FullPath, shouldDeleteChunks)
 
-	if storeDeletionErr := f.Store.DeleteEntry(ctx, entry.FullPath); storeDeletionErr != nil {
+	if storeDeletionErr := f.Store.DeleteOneEntry(ctx, entry); storeDeletionErr != nil {
 		return fmt.Errorf("filer store delete: %v", storeDeletionErr)
 	}
 	if !entry.IsDirectory() {
@@ -145,3 +151,33 @@ func (f *Filer) doDeleteCollection(collectionName string) (err error) {
 	})
 
 }
+
+func (f *Filer) maybeDeleteHardLinks(hardLinkIds []HardLinkId) {
+	for _, hardLinkId := range hardLinkIds {
+		if err := f.Store.DeleteHardLink(context.Background(), hardLinkId); err != nil {
+			glog.Errorf("delete hard link id %d : %v", hardLinkId, err)
+		}
+	}
+}
+
+func (f *Filer) removeEmptyParentFolder(ctx context.Context, dir util.FullPath) error {
+	if !strings.HasPrefix(string(dir), f.DirBucketsPath) {
+		return nil
+	}
+	parent, _ := dir.DirAndName()
+	if parent == f.DirBucketsPath {
+		// should not delete bucket itself
+		return nil
+	}
+	entries, err := f.ListDirectoryEntries(ctx, dir, "", false, 1, "")
+	if err != nil {
+		return err
+	}
+	if len(entries) > 0 {
+		return nil
+	}
+	if err := f.Store.DeleteEntry(ctx, dir); err != nil {
+		return err
+	}
+	return f.removeEmptyParentFolder(ctx, util.FullPath(parent))
+}
diff --git a/weed/filer/filer_deletion.go b/weed/filer/filer_deletion.go
index 9eee38277..09af80b42 100644
--- a/weed/filer/filer_deletion.go
+++ b/weed/filer/filer_deletion.go
@@ -151,3 +151,4 @@ func (f *Filer) deleteChunksIfNotNew(oldEntry, newEntry *Entry) {
 	}
 	f.DeleteChunks(toDelete)
 }
+
diff --git a/weed/filer/filerstore.go b/weed/filer/filerstore.go
index 11e30878d..3ad7a787e 100644
--- a/weed/filer/filerstore.go
+++ b/weed/filer/filerstore.go
@@ -45,6 +45,7 @@ type FilerStore interface {
 type VirtualFilerStore interface {
 	FilerStore
 	DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error
+	DeleteOneEntry(ctx context.Context, entry *Entry) error
 }
 
 type FilerStoreWrapper struct {
@@ -145,6 +146,23 @@ func (fsw *FilerStoreWrapper) DeleteEntry(ctx context.Context, fp util.FullPath)
 	return fsw.ActualStore.DeleteEntry(ctx, fp)
 }
 
+func (fsw *FilerStoreWrapper) DeleteOneEntry(ctx context.Context, existingEntry *Entry) (err error) {
+	stats.FilerStoreCounter.WithLabelValues(fsw.ActualStore.GetName(), "delete").Inc()
+	start := time.Now()
+	defer func() {
+		stats.FilerStoreHistogram.WithLabelValues(fsw.ActualStore.GetName(), "delete").Observe(time.Since(start).Seconds())
+	}()
+
+	if len(existingEntry.HardLinkId) != 0 {
+		// remove hard link
+		if err = fsw.DeleteHardLink(ctx, existingEntry.HardLinkId); err != nil {
+			return err
+		}
+	}
+
+	return fsw.ActualStore.DeleteEntry(ctx, existingEntry.FullPath)
+}
+
 func (fsw *FilerStoreWrapper) DeleteFolderChildren(ctx context.Context, fp util.FullPath) (err error) {
 	stats.FilerStoreCounter.WithLabelValues(fsw.ActualStore.GetName(), "deleteFolderChildren").Inc()
 	start := time.Now()
diff --git a/weed/filer/leveldb/leveldb_store.go b/weed/filer/leveldb/leveldb_store.go
index 4b8dd5ea9..b879f3a6e 100644
--- a/weed/filer/leveldb/leveldb_store.go
+++ b/weed/filer/leveldb/leveldb_store.go
@@ -162,14 +162,14 @@ func (store *LevelDBStore) DeleteFolderChildren(ctx context.Context, fullpath we
 	return nil
 }
 
-func (store *LevelDBStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
-	return nil, filer.ErrUnsupportedListDirectoryPrefixed
-}
-
 func (store *LevelDBStore) ListDirectoryEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool,
 	limit int) (entries []*filer.Entry, err error) {
+	return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "")
+}
 
-	directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
+func (store *LevelDBStore) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
+
+	directoryPrefix := genDirectoryKeyPrefix(fullpath, prefix)
 
 	iter := store.db.NewIterator(&leveldb_util.Range{Start: genDirectoryKeyPrefix(fullpath, startFileName)}, nil)
 	for iter.Next() {
diff --git a/weed/filer/leveldb2/leveldb2_store.go b/weed/filer/leveldb2/leveldb2_store.go
index 2ad0dd648..4b41554b9 100644
--- a/weed/filer/leveldb2/leveldb2_store.go
+++ b/weed/filer/leveldb2/leveldb2_store.go
@@ -171,14 +171,14 @@ func (store *LevelDB2Store) DeleteFolderChildren(ctx context.Context, fullpath w
 	return nil
 }
 
-func (store *LevelDB2Store) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
-	return nil, filer.ErrUnsupportedListDirectoryPrefixed
-}
-
 func (store *LevelDB2Store) ListDirectoryEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool,
 	limit int) (entries []*filer.Entry, err error) {
+	return store.ListDirectoryPrefixedEntries(ctx, fullpath, startFileName, inclusive, limit, "")
+}
 
-	directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, "", store.dbCount)
+func (store *LevelDB2Store) ListDirectoryPrefixedEntries(ctx context.Context, fullpath weed_util.FullPath, startFileName string, inclusive bool, limit int, prefix string) (entries []*filer.Entry, err error) {
+
+	directoryPrefix, partitionId := genDirectoryKeyPrefix(fullpath, prefix, store.dbCount)
 	lastFileStart, _ := genDirectoryKeyPrefix(fullpath, startFileName, store.dbCount)
 
 	iter := store.dbs[partitionId].NewIterator(&leveldb_util.Range{Start: lastFileStart}, nil)
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index 54410a0ba..abe77f063 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -110,6 +110,12 @@ func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
 		return 0, io.EOF
 	}
 
+	if offset+int64(len(buff)) <= int64(len(fh.f.entry.Content)) {
+		totalRead := copy(buff, fh.f.entry.Content[offset:])
+		glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead)
+		return int64(totalRead), nil
+	}
+
 	var chunkResolveErr error
 	if fh.f.entryViewCache == nil {
 		fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(filer.LookupFn(fh.f.wfs), fh.f.entry.Chunks)
@@ -149,6 +155,7 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f
 		copy(data, req.Data)
 	}
 
+	fh.f.entry.Content = nil
 	fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
 	glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))
 
diff --git a/weed/filesys/wfs_filer_client.go b/weed/filesys/wfs_filer_client.go
index dd76f5669..ef4213af1 100644
--- a/weed/filesys/wfs_filer_client.go
+++ b/weed/filesys/wfs_filer_client.go
@@ -12,7 +12,7 @@ var _ = filer_pb.FilerClient(&WFS{})
 
 func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	err := util.Retry("filer grpc", func() error {
+	err := util.Retry("filer grpc "+wfs.option.FilerGrpcAddress, func() error {
 		return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
 			client := filer_pb.NewSeaweedFilerClient(grpcConnection)
 			return fn(client)
diff --git a/weed/operation/needle_parse_test.go b/weed/operation/needle_parse_test.go
index 177c620f4..202374e1b 100644
--- a/weed/operation/needle_parse_test.go
+++ b/weed/operation/needle_parse_test.go
@@ -75,29 +75,31 @@ func TestCreateNeedleFromRequest(t *testing.T) {
 		Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(gzippedData), true, "text/plain", nil, "")
 	}
 
-	{
-		mc.needleHandling = func(n *needle.Needle, originalSize int, err error) {
-			assert.Equal(t, nil, err, "upload: %v", err)
-			assert.Equal(t, "text/plain", string(n.Mime), "mime detection failed: %v", string(n.Mime))
-			assert.Equal(t, true, n.IsCompressed(), "this should be compressed")
-			assert.Equal(t, true, util.IsZstdContent(n.Data), "this should be zstd")
-			fmt.Printf("needle: %v, dataSize:%d originalSize:%d\n", n, len(n.Data), originalSize)
+	/*
+		{
+			mc.needleHandling = func(n *needle.Needle, originalSize int, err error) {
+				assert.Equal(t, nil, err, "upload: %v", err)
+				assert.Equal(t, "text/plain", string(n.Mime), "mime detection failed: %v", string(n.Mime))
+				assert.Equal(t, true, n.IsCompressed(), "this should be compressed")
+				assert.Equal(t, true, util.IsZstdContent(n.Data), "this should be zstd")
+				fmt.Printf("needle: %v, dataSize:%d originalSize:%d\n", n, len(n.Data), originalSize)
+			}
+			zstdData, _ := util.ZstdData([]byte(textContent))
+			Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(zstdData), true, "text/plain", nil, "")
 		}
-		zstdData, _ := util.ZstdData([]byte(textContent))
-		Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(zstdData), true, "text/plain", nil, "")
-	}
 
-	{
-		mc.needleHandling = func(n *needle.Needle, originalSize int, err error) {
-			assert.Equal(t, nil, err, "upload: %v", err)
-			assert.Equal(t, "application/zstd", string(n.Mime), "mime detection failed: %v", string(n.Mime))
-			assert.Equal(t, false, n.IsCompressed(), "this should not be compressed")
-			assert.Equal(t, true, util.IsZstdContent(n.Data), "this should still be zstd")
-			fmt.Printf("needle: %v, dataSize:%d originalSize:%d\n", n, len(n.Data), originalSize)
+		{
+			mc.needleHandling = func(n *needle.Needle, originalSize int, err error) {
+				assert.Equal(t, nil, err, "upload: %v", err)
+				assert.Equal(t, "application/zstd", string(n.Mime), "mime detection failed: %v", string(n.Mime))
+				assert.Equal(t, false, n.IsCompressed(), "this should not be compressed")
+				assert.Equal(t, true, util.IsZstdContent(n.Data), "this should still be zstd")
+				fmt.Printf("needle: %v, dataSize:%d originalSize:%d\n", n, len(n.Data), originalSize)
+			}
+			zstdData, _ := util.ZstdData([]byte(textContent))
+			Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(zstdData), false, "application/zstd", nil, "")
 		}
-		zstdData, _ := util.ZstdData([]byte(textContent))
-		Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(zstdData), false, "application/zstd", nil, "")
-	}
+	*/
 
 }
 
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index f61b62fa3..c046e48f3 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -100,6 +100,7 @@ message Entry {
     map<string, bytes> extended = 5;
     bytes hard_link_id = 7;
     int32 hard_link_counter = 8; // only exists in hard link meta data
+    bytes content = 9; // if not empty, the file content
 }
 
 message FullEntry {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 4e0207413..deddbeff1 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -318,6 +318,7 @@ type Entry struct {
 	Extended        map[string][]byte `protobuf:"bytes,5,rep,name=extended,proto3" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	HardLinkId      []byte            `protobuf:"bytes,7,opt,name=hard_link_id,json=hardLinkId,proto3" json:"hard_link_id,omitempty"`
 	HardLinkCounter int32             `protobuf:"varint,8,opt,name=hard_link_counter,json=hardLinkCounter,proto3" json:"hard_link_counter,omitempty"` // only exists in hard link meta data
+	Content         []byte            `protobuf:"bytes,9,opt,name=content,proto3" json:"content,omitempty"`                                           // if not empty, the file content
 }
 
 func (x *Entry) Reset() {
@@ -401,6 +402,13 @@ func (x *Entry) GetHardLinkCounter() int32 {
 	return 0
 }
 
+func (x *Entry) GetContent() []byte {
+	if x != nil {
+		return x.Content
+	}
+	return nil
+}
+
 type FullEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3288,8 +3296,8 @@ var file_filer_proto_rawDesc = []byte{
 	0x22, 0x3c, 0x0a, 0x13, 0x4c, 0x69, 0x73, 0x74, 0x45, 0x6e, 0x74, 0x72, 0x69, 0x65, 0x73, 0x52,
 	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x25, 0x0a, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0f, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
-	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0xeb,
-	0x02, 0x0a, 0x05, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65,
+	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0x85,
+	0x03, 0x0a, 0x05, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x21, 0x0a, 0x0c,
 	0x69, 0x73, 0x5f, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x18, 0x02, 0x20, 0x01,
 	0x28, 0x08, 0x52, 0x0b, 0x69, 0x73, 0x44, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x12,
@@ -3307,467 +3315,468 @@ var file_filer_proto_rawDesc = []byte{
 	0x64, 0x18, 0x07, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x0a, 0x68, 0x61, 0x72, 0x64, 0x4c, 0x69, 0x6e,
 	0x6b, 0x49, 0x64, 0x12, 0x2a, 0x0a, 0x11, 0x68, 0x61, 0x72, 0x64, 0x5f, 0x6c, 0x69, 0x6e, 0x6b,
 	0x5f, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x65, 0x72, 0x18, 0x08, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0f,
-	0x68, 0x61, 0x72, 0x64, 0x4c, 0x69, 0x6e, 0x6b, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x65, 0x72, 0x1a,
-	0x3b, 0x0a, 0x0d, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65, 0x64, 0x45, 0x6e, 0x74, 0x72, 0x79,
-	0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b,
-	0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28,
-	0x0c, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0x44, 0x0a, 0x09,
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 }
 
 var (
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 26100fe80..87fdb53af 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -25,6 +25,8 @@ service Seaweed {
     }
     rpc LookupEcVolume (LookupEcVolumeRequest) returns (LookupEcVolumeResponse) {
     }
+    rpc VacuumVolume (VacuumVolumeRequest) returns (VacuumVolumeResponse) {
+    }
     rpc GetMasterConfiguration (GetMasterConfigurationRequest) returns (GetMasterConfigurationResponse) {
     }
     rpc ListMasterClients (ListMasterClientsRequest) returns (ListMasterClientsResponse) {
@@ -264,6 +266,12 @@ message LookupEcVolumeResponse {
     repeated EcShardIdLocation shard_id_locations = 2;
 }
 
+message VacuumVolumeRequest {
+    float garbage_threshold = 1;
+}
+message VacuumVolumeResponse {
+}
+
 message GetMasterConfigurationRequest {
 }
 message GetMasterConfigurationResponse {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index d1b1d3cb0..d206564f9 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2189,6 +2189,91 @@ func (x *LookupEcVolumeResponse) GetShardIdLocations() []*LookupEcVolumeResponse
 	return nil
 }
 
+type VacuumVolumeRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	GarbageThreshold float32 `protobuf:"fixed32,1,opt,name=garbage_threshold,json=garbageThreshold,proto3" json:"garbage_threshold,omitempty"`
+}
+
+func (x *VacuumVolumeRequest) Reset() {
+	*x = VacuumVolumeRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[30]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VacuumVolumeRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VacuumVolumeRequest) ProtoMessage() {}
+
+func (x *VacuumVolumeRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[30]
+	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 VacuumVolumeRequest.ProtoReflect.Descriptor instead.
+func (*VacuumVolumeRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{30}
+}
+
+func (x *VacuumVolumeRequest) GetGarbageThreshold() float32 {
+	if x != nil {
+		return x.GarbageThreshold
+	}
+	return 0
+}
+
+type VacuumVolumeResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *VacuumVolumeResponse) Reset() {
+	*x = VacuumVolumeResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[31]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VacuumVolumeResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VacuumVolumeResponse) ProtoMessage() {}
+
+func (x *VacuumVolumeResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[31]
+	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 VacuumVolumeResponse.ProtoReflect.Descriptor instead.
+func (*VacuumVolumeResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{31}
+}
+
 type GetMasterConfigurationRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2198,7 +2283,7 @@ type GetMasterConfigurationRequest struct {
 func (x *GetMasterConfigurationRequest) Reset() {
 	*x = GetMasterConfigurationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[30]
+		mi := &file_master_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2211,7 +2296,7 @@ func (x *GetMasterConfigurationRequest) String() string {
 func (*GetMasterConfigurationRequest) ProtoMessage() {}
 
 func (x *GetMasterConfigurationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[30]
+	mi := &file_master_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2224,7 +2309,7 @@ func (x *GetMasterConfigurationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetMasterConfigurationRequest.ProtoReflect.Descriptor instead.
 func (*GetMasterConfigurationRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{30}
+	return file_master_proto_rawDescGZIP(), []int{32}
 }
 
 type GetMasterConfigurationResponse struct {
@@ -2242,7 +2327,7 @@ type GetMasterConfigurationResponse struct {
 func (x *GetMasterConfigurationResponse) Reset() {
 	*x = GetMasterConfigurationResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[31]
+		mi := &file_master_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2255,7 +2340,7 @@ func (x *GetMasterConfigurationResponse) String() string {
 func (*GetMasterConfigurationResponse) ProtoMessage() {}
 
 func (x *GetMasterConfigurationResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[31]
+	mi := &file_master_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2268,7 +2353,7 @@ func (x *GetMasterConfigurationResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetMasterConfigurationResponse.ProtoReflect.Descriptor instead.
 func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{31}
+	return file_master_proto_rawDescGZIP(), []int{33}
 }
 
 func (x *GetMasterConfigurationResponse) GetMetricsAddress() string {
@@ -2317,7 +2402,7 @@ type ListMasterClientsRequest struct {
 func (x *ListMasterClientsRequest) Reset() {
 	*x = ListMasterClientsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[32]
+		mi := &file_master_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2330,7 +2415,7 @@ func (x *ListMasterClientsRequest) String() string {
 func (*ListMasterClientsRequest) ProtoMessage() {}
 
 func (x *ListMasterClientsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[32]
+	mi := &file_master_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2343,7 +2428,7 @@ func (x *ListMasterClientsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListMasterClientsRequest.ProtoReflect.Descriptor instead.
 func (*ListMasterClientsRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{32}
+	return file_master_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *ListMasterClientsRequest) GetClientType() string {
@@ -2364,7 +2449,7 @@ type ListMasterClientsResponse struct {
 func (x *ListMasterClientsResponse) Reset() {
 	*x = ListMasterClientsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[33]
+		mi := &file_master_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2377,7 +2462,7 @@ func (x *ListMasterClientsResponse) String() string {
 func (*ListMasterClientsResponse) ProtoMessage() {}
 
 func (x *ListMasterClientsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[33]
+	mi := &file_master_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2390,7 +2475,7 @@ func (x *ListMasterClientsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListMasterClientsResponse.ProtoReflect.Descriptor instead.
 func (*ListMasterClientsResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{33}
+	return file_master_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *ListMasterClientsResponse) GetGrpcAddresses() []string {
@@ -2413,7 +2498,7 @@ type LeaseAdminTokenRequest struct {
 func (x *LeaseAdminTokenRequest) Reset() {
 	*x = LeaseAdminTokenRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[34]
+		mi := &file_master_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2426,7 +2511,7 @@ func (x *LeaseAdminTokenRequest) String() string {
 func (*LeaseAdminTokenRequest) ProtoMessage() {}
 
 func (x *LeaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[34]
+	mi := &file_master_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2439,7 +2524,7 @@ func (x *LeaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LeaseAdminTokenRequest.ProtoReflect.Descriptor instead.
 func (*LeaseAdminTokenRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{34}
+	return file_master_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *LeaseAdminTokenRequest) GetPreviousToken() int64 {
@@ -2475,7 +2560,7 @@ type LeaseAdminTokenResponse struct {
 func (x *LeaseAdminTokenResponse) Reset() {
 	*x = LeaseAdminTokenResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[35]
+		mi := &file_master_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2488,7 +2573,7 @@ func (x *LeaseAdminTokenResponse) String() string {
 func (*LeaseAdminTokenResponse) ProtoMessage() {}
 
 func (x *LeaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[35]
+	mi := &file_master_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2501,7 +2586,7 @@ func (x *LeaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LeaseAdminTokenResponse.ProtoReflect.Descriptor instead.
 func (*LeaseAdminTokenResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{35}
+	return file_master_proto_rawDescGZIP(), []int{37}
 }
 
 func (x *LeaseAdminTokenResponse) GetToken() int64 {
@@ -2531,7 +2616,7 @@ type ReleaseAdminTokenRequest struct {
 func (x *ReleaseAdminTokenRequest) Reset() {
 	*x = ReleaseAdminTokenRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[36]
+		mi := &file_master_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2544,7 +2629,7 @@ func (x *ReleaseAdminTokenRequest) String() string {
 func (*ReleaseAdminTokenRequest) ProtoMessage() {}
 
 func (x *ReleaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[36]
+	mi := &file_master_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2557,7 +2642,7 @@ func (x *ReleaseAdminTokenRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ReleaseAdminTokenRequest.ProtoReflect.Descriptor instead.
 func (*ReleaseAdminTokenRequest) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{36}
+	return file_master_proto_rawDescGZIP(), []int{38}
 }
 
 func (x *ReleaseAdminTokenRequest) GetPreviousToken() int64 {
@@ -2590,7 +2675,7 @@ type ReleaseAdminTokenResponse struct {
 func (x *ReleaseAdminTokenResponse) Reset() {
 	*x = ReleaseAdminTokenResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[37]
+		mi := &file_master_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2603,7 +2688,7 @@ func (x *ReleaseAdminTokenResponse) String() string {
 func (*ReleaseAdminTokenResponse) ProtoMessage() {}
 
 func (x *ReleaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[37]
+	mi := &file_master_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2616,7 +2701,7 @@ func (x *ReleaseAdminTokenResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ReleaseAdminTokenResponse.ProtoReflect.Descriptor instead.
 func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) {
-	return file_master_proto_rawDescGZIP(), []int{37}
+	return file_master_proto_rawDescGZIP(), []int{39}
 }
 
 type SuperBlockExtra_ErasureCoding struct {
@@ -2632,7 +2717,7 @@ type SuperBlockExtra_ErasureCoding struct {
 func (x *SuperBlockExtra_ErasureCoding) Reset() {
 	*x = SuperBlockExtra_ErasureCoding{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[39]
+		mi := &file_master_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2645,7 +2730,7 @@ func (x *SuperBlockExtra_ErasureCoding) String() string {
 func (*SuperBlockExtra_ErasureCoding) ProtoMessage() {}
 
 func (x *SuperBlockExtra_ErasureCoding) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[39]
+	mi := &file_master_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2695,7 +2780,7 @@ type LookupVolumeResponse_VolumeIdLocation struct {
 func (x *LookupVolumeResponse_VolumeIdLocation) Reset() {
 	*x = LookupVolumeResponse_VolumeIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[40]
+		mi := &file_master_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2708,7 +2793,7 @@ func (x *LookupVolumeResponse_VolumeIdLocation) String() string {
 func (*LookupVolumeResponse_VolumeIdLocation) ProtoMessage() {}
 
 func (x *LookupVolumeResponse_VolumeIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[40]
+	mi := &file_master_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2757,7 +2842,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[41]
+		mi := &file_master_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2770,7 +2855,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[41]
+	mi := &file_master_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3165,134 +3250,145 @@ var file_master_proto_rawDesc = []byte{
 	0x64, 0x12, 0x31, 0x0a, 0x09, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x02,
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+	0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -3307,7 +3403,7 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 42)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_master_proto_goTypes = []interface{}{
 	(*Heartbeat)(nil),                                // 0: master_pb.Heartbeat
 	(*HeartbeatResponse)(nil),                        // 1: master_pb.HeartbeatResponse
@@ -3339,18 +3435,20 @@ var file_master_proto_goTypes = []interface{}{
 	(*VolumeListResponse)(nil),                       // 27: master_pb.VolumeListResponse
 	(*LookupEcVolumeRequest)(nil),                    // 28: master_pb.LookupEcVolumeRequest
 	(*LookupEcVolumeResponse)(nil),                   // 29: master_pb.LookupEcVolumeResponse
-	(*GetMasterConfigurationRequest)(nil),            // 30: master_pb.GetMasterConfigurationRequest
-	(*GetMasterConfigurationResponse)(nil),           // 31: master_pb.GetMasterConfigurationResponse
-	(*ListMasterClientsRequest)(nil),                 // 32: master_pb.ListMasterClientsRequest
-	(*ListMasterClientsResponse)(nil),                // 33: master_pb.ListMasterClientsResponse
-	(*LeaseAdminTokenRequest)(nil),                   // 34: master_pb.LeaseAdminTokenRequest
-	(*LeaseAdminTokenResponse)(nil),                  // 35: master_pb.LeaseAdminTokenResponse
-	(*ReleaseAdminTokenRequest)(nil),                 // 36: master_pb.ReleaseAdminTokenRequest
-	(*ReleaseAdminTokenResponse)(nil),                // 37: master_pb.ReleaseAdminTokenResponse
-	nil,                                              // 38: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),            // 39: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil),    // 40: master_pb.LookupVolumeResponse.VolumeIdLocation
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 41: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*VacuumVolumeRequest)(nil),                      // 30: master_pb.VacuumVolumeRequest
+	(*VacuumVolumeResponse)(nil),                     // 31: master_pb.VacuumVolumeResponse
+	(*GetMasterConfigurationRequest)(nil),            // 32: master_pb.GetMasterConfigurationRequest
+	(*GetMasterConfigurationResponse)(nil),           // 33: master_pb.GetMasterConfigurationResponse
+	(*ListMasterClientsRequest)(nil),                 // 34: master_pb.ListMasterClientsRequest
+	(*ListMasterClientsResponse)(nil),                // 35: master_pb.ListMasterClientsResponse
+	(*LeaseAdminTokenRequest)(nil),                   // 36: master_pb.LeaseAdminTokenRequest
+	(*LeaseAdminTokenResponse)(nil),                  // 37: master_pb.LeaseAdminTokenResponse
+	(*ReleaseAdminTokenRequest)(nil),                 // 38: master_pb.ReleaseAdminTokenRequest
+	(*ReleaseAdminTokenResponse)(nil),                // 39: master_pb.ReleaseAdminTokenResponse
+	nil,                                              // 40: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),            // 41: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil),    // 42: master_pb.LookupVolumeResponse.VolumeIdLocation
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 43: master_pb.LookupEcVolumeResponse.EcShardIdLocation
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3360,9 +3458,9 @@ var file_master_proto_depIdxs = []int32{
 	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
 	5,  // 6: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
-	38, // 7: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
-	39, // 8: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
-	40, // 9: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
+	40, // 7: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
+	41, // 8: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
+	42, // 9: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
 	17, // 10: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
 	2,  // 11: master_pb.DataNodeInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
 	4,  // 12: master_pb.DataNodeInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
@@ -3370,7 +3468,7 @@ var file_master_proto_depIdxs = []int32{
 	23, // 14: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
 	24, // 15: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
 	25, // 16: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	41, // 17: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	43, // 17: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
 	5,  // 18: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
 	12, // 19: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
 	12, // 20: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
@@ -3383,25 +3481,27 @@ var file_master_proto_depIdxs = []int32{
 	20, // 27: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
 	26, // 28: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
 	28, // 29: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
-	30, // 30: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
-	32, // 31: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
-	34, // 32: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
-	36, // 33: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 34: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	9,  // 35: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
-	11, // 36: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	14, // 37: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	16, // 38: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	19, // 39: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	21, // 40: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	27, // 41: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	29, // 42: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	31, // 43: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	33, // 44: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
-	35, // 45: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	37, // 46: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	34, // [34:47] is the sub-list for method output_type
-	21, // [21:34] is the sub-list for method input_type
+	30, // 30: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
+	32, // 31: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
+	34, // 32: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
+	36, // 33: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
+	38, // 34: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
+	1,  // 35: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	9,  // 36: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
+	11, // 37: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	14, // 38: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	16, // 39: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	19, // 40: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	21, // 41: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	27, // 42: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	29, // 43: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	31, // 44: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	33, // 45: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	35, // 46: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
+	37, // 47: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	39, // 48: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	35, // [35:49] is the sub-list for method output_type
+	21, // [21:35] is the sub-list for method input_type
 	21, // [21:21] is the sub-list for extension type_name
 	21, // [21:21] is the sub-list for extension extendee
 	0,  // [0:21] is the sub-list for field type_name
@@ -3774,7 +3874,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetMasterConfigurationRequest); i {
+			switch v := v.(*VacuumVolumeRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3786,7 +3886,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetMasterConfigurationResponse); i {
+			switch v := v.(*VacuumVolumeResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3798,7 +3898,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListMasterClientsRequest); i {
+			switch v := v.(*GetMasterConfigurationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3810,7 +3910,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListMasterClientsResponse); i {
+			switch v := v.(*GetMasterConfigurationResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3822,7 +3922,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LeaseAdminTokenRequest); i {
+			switch v := v.(*ListMasterClientsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3834,7 +3934,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LeaseAdminTokenResponse); i {
+			switch v := v.(*ListMasterClientsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3846,7 +3946,7 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ReleaseAdminTokenRequest); i {
+			switch v := v.(*LeaseAdminTokenRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3858,7 +3958,19 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ReleaseAdminTokenResponse); i {
+			switch v := v.(*LeaseAdminTokenResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReleaseAdminTokenRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3870,6 +3982,18 @@ func file_master_proto_init() {
 			}
 		}
 		file_master_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReleaseAdminTokenResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
 			case 0:
 				return &v.state
@@ -3881,7 +4005,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupVolumeResponse_VolumeIdLocation); i {
 			case 0:
 				return &v.state
@@ -3893,7 +4017,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -3912,7 +4036,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   42,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
@@ -3947,6 +4071,7 @@ type SeaweedClient interface {
 	CollectionDelete(ctx context.Context, in *CollectionDeleteRequest, opts ...grpc.CallOption) (*CollectionDeleteResponse, error)
 	VolumeList(ctx context.Context, in *VolumeListRequest, opts ...grpc.CallOption) (*VolumeListResponse, error)
 	LookupEcVolume(ctx context.Context, in *LookupEcVolumeRequest, opts ...grpc.CallOption) (*LookupEcVolumeResponse, error)
+	VacuumVolume(ctx context.Context, in *VacuumVolumeRequest, opts ...grpc.CallOption) (*VacuumVolumeResponse, error)
 	GetMasterConfiguration(ctx context.Context, in *GetMasterConfigurationRequest, opts ...grpc.CallOption) (*GetMasterConfigurationResponse, error)
 	ListMasterClients(ctx context.Context, in *ListMasterClientsRequest, opts ...grpc.CallOption) (*ListMasterClientsResponse, error)
 	LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error)
@@ -4086,6 +4211,15 @@ func (c *seaweedClient) LookupEcVolume(ctx context.Context, in *LookupEcVolumeRe
 	return out, nil
 }
 
+func (c *seaweedClient) VacuumVolume(ctx context.Context, in *VacuumVolumeRequest, opts ...grpc.CallOption) (*VacuumVolumeResponse, error) {
+	out := new(VacuumVolumeResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/VacuumVolume", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *seaweedClient) GetMasterConfiguration(ctx context.Context, in *GetMasterConfigurationRequest, opts ...grpc.CallOption) (*GetMasterConfigurationResponse, error) {
 	out := new(GetMasterConfigurationResponse)
 	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/GetMasterConfiguration", in, out, opts...)
@@ -4133,6 +4267,7 @@ type SeaweedServer interface {
 	CollectionDelete(context.Context, *CollectionDeleteRequest) (*CollectionDeleteResponse, error)
 	VolumeList(context.Context, *VolumeListRequest) (*VolumeListResponse, error)
 	LookupEcVolume(context.Context, *LookupEcVolumeRequest) (*LookupEcVolumeResponse, error)
+	VacuumVolume(context.Context, *VacuumVolumeRequest) (*VacuumVolumeResponse, error)
 	GetMasterConfiguration(context.Context, *GetMasterConfigurationRequest) (*GetMasterConfigurationResponse, error)
 	ListMasterClients(context.Context, *ListMasterClientsRequest) (*ListMasterClientsResponse, error)
 	LeaseAdminToken(context.Context, *LeaseAdminTokenRequest) (*LeaseAdminTokenResponse, error)
@@ -4170,6 +4305,9 @@ func (*UnimplementedSeaweedServer) VolumeList(context.Context, *VolumeListReques
 func (*UnimplementedSeaweedServer) LookupEcVolume(context.Context, *LookupEcVolumeRequest) (*LookupEcVolumeResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method LookupEcVolume not implemented")
 }
+func (*UnimplementedSeaweedServer) VacuumVolume(context.Context, *VacuumVolumeRequest) (*VacuumVolumeResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method VacuumVolume not implemented")
+}
 func (*UnimplementedSeaweedServer) GetMasterConfiguration(context.Context, *GetMasterConfigurationRequest) (*GetMasterConfigurationResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetMasterConfiguration not implemented")
 }
@@ -4365,6 +4503,24 @@ func _Seaweed_LookupEcVolume_Handler(srv interface{}, ctx context.Context, dec f
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_VacuumVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(VacuumVolumeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).VacuumVolume(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/VacuumVolume",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).VacuumVolume(ctx, req.(*VacuumVolumeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _Seaweed_GetMasterConfiguration_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(GetMasterConfigurationRequest)
 	if err := dec(in); err != nil {
@@ -4469,6 +4625,10 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 			MethodName: "LookupEcVolume",
 			Handler:    _Seaweed_LookupEcVolume_Handler,
 		},
+		{
+			MethodName: "VacuumVolume",
+			Handler:    _Seaweed_VacuumVolume_Handler,
+		},
 		{
 			MethodName: "GetMasterConfiguration",
 			Handler:    _Seaweed_GetMasterConfiguration_Handler,
diff --git a/weed/replication/sink/filersink/filer_sink.go b/weed/replication/sink/filersink/filer_sink.go
index 6f467ea58..a58c8f296 100644
--- a/weed/replication/sink/filersink/filer_sink.go
+++ b/weed/replication/sink/filersink/filer_sink.go
@@ -112,6 +112,7 @@ func (fs *FilerSink) CreateEntry(key string, entry *filer_pb.Entry, signatures [
 				IsDirectory: entry.IsDirectory,
 				Attributes:  entry.Attributes,
 				Chunks:      replicatedChunks,
+				Content:     entry.Content,
 			},
 			IsFromOtherCluster: true,
 			Signatures:         signatures,
diff --git a/weed/security/tls.go b/weed/security/tls.go
index 5821b159d..72363768f 100644
--- a/weed/security/tls.go
+++ b/weed/security/tls.go
@@ -24,7 +24,7 @@ func LoadServerTLS(config *viper.Viper, component string) grpc.ServerOption {
 		glog.V(1).Infof("load cert/key error: %v", err)
 		return nil
 	}
-	caCert, err := ioutil.ReadFile(config.GetString(component + ".ca"))
+	caCert, err := ioutil.ReadFile(config.GetString("grpc.ca"))
 	if err != nil {
 		glog.V(1).Infof("read ca cert file error: %v", err)
 		return nil
@@ -45,7 +45,7 @@ func LoadClientTLS(config *viper.Viper, component string) grpc.DialOption {
 		return grpc.WithInsecure()
 	}
 
-	certFileName, keyFileName, caFileName := config.GetString(component+".cert"), config.GetString(component+".key"), config.GetString(component+".ca")
+	certFileName, keyFileName, caFileName := config.GetString(component+".cert"), config.GetString(component+".key"), config.GetString("grpc.ca")
 	if certFileName == "" || keyFileName == "" || caFileName == "" {
 		return grpc.WithInsecure()
 	}
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 7b04e4fab..46e5c5957 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -39,6 +39,7 @@ func (fs *FilerServer) LookupDirectoryEntry(ctx context.Context, req *filer_pb.L
 			Extended:        entry.Extended,
 			HardLinkId:      entry.HardLinkId,
 			HardLinkCounter: entry.HardLinkCounter,
+			Content:         entry.Content,
 		},
 	}, nil
 }
@@ -84,6 +85,7 @@ func (fs *FilerServer) ListEntries(req *filer_pb.ListEntriesRequest, stream file
 					Extended:        entry.Extended,
 					HardLinkId:      entry.HardLinkId,
 					HardLinkCounter: entry.HardLinkCounter,
+					Content:         entry.Content,
 				},
 			}); err != nil {
 				return err
diff --git a/weed/server/filer_grpc_server_rename.go b/weed/server/filer_grpc_server_rename.go
index f9ddeb600..391efb793 100644
--- a/weed/server/filer_grpc_server_rename.go
+++ b/weed/server/filer_grpc_server_rename.go
@@ -110,6 +110,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, oldParent util.FullPat
 		Attr:     entry.Attr,
 		Chunks:   entry.Chunks,
 		Extended: entry.Extended,
+		Content:  entry.Content,
 	}
 	createErr := fs.filer.CreateEntry(ctx, newEntry, false, false, nil)
 	if createErr != nil {
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index b11448db4..461c08aad 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -126,6 +126,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		defaultMux.HandleFunc("/", fs.filerHandler)
 	}
 	if defaultMux != readonlyMux {
+		handleStaticResources(readonlyMux)
 		readonlyMux.HandleFunc("/", fs.readonlyFilerHandler)
 	}
 
diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index 69d485e90..f77b7f08d 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -147,6 +147,10 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 	}
 
 	processRangeRequest(r, w, totalSize, mimeType, func(writer io.Writer, offset int64, size int64) error {
+		if offset+size <= int64(len(entry.Content)) {
+			_, err := writer.Write(entry.Content[offset:offset+size])
+			return err
+		}
 		return filer.StreamContent(fs.filer.MasterClient, writer, entry.Chunks, offset, size)
 	})
 
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index 09a8e3626..c2d92f8ba 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -66,6 +66,7 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	)
 
 	fs.autoChunk(ctx, w, r, so)
+	util.CloseRequest(r)
 
 }
 
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index fd2db884f..4d8a4d44c 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -87,7 +87,7 @@ func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWrite
 		contentType = ""
 	}
 
-	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, part1, chunkSize, fileName, contentType, so)
+	fileChunks, md5Hash, chunkOffset, err, smallContent := fs.uploadReaderToChunks(w, r, part1, chunkSize, fileName, contentType, so)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -99,7 +99,7 @@ func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWrite
 	}
 
 	md5bytes = md5Hash.Sum(nil)
-	filerResult, replyerr = fs.saveMetaData(ctx, r, fileName, contentType, so, md5bytes, fileChunks, chunkOffset)
+	filerResult, replyerr = fs.saveMetaData(ctx, r, fileName, contentType, so, md5bytes, fileChunks, chunkOffset, smallContent)
 
 	return
 }
@@ -109,7 +109,7 @@ func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter
 	fileName := ""
 	contentType := ""
 
-	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, r.Body, chunkSize, fileName, contentType, so)
+	fileChunks, md5Hash, chunkOffset, err, smallContent := fs.uploadReaderToChunks(w, r, r.Body, chunkSize, fileName, contentType, so)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -121,12 +121,12 @@ func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter
 	}
 
 	md5bytes = md5Hash.Sum(nil)
-	filerResult, replyerr = fs.saveMetaData(ctx, r, fileName, contentType, so, md5bytes, fileChunks, chunkOffset)
+	filerResult, replyerr = fs.saveMetaData(ctx, r, fileName, contentType, so, md5bytes, fileChunks, chunkOffset, smallContent)
 
 	return
 }
 
-func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileName string, contentType string, so *operation.StorageOption, md5bytes []byte, fileChunks []*filer_pb.FileChunk, chunkOffset int64) (filerResult *FilerPostResult, replyerr error) {
+func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileName string, contentType string, so *operation.StorageOption, md5bytes []byte, fileChunks []*filer_pb.FileChunk, chunkOffset int64, content []byte) (filerResult *FilerPostResult, replyerr error) {
 
 	// detect file mode
 	modeStr := r.URL.Query().Get("mode")
@@ -147,19 +147,12 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 		}
 	}
 
-	// fix the crTime
-	existingEntry, err := fs.filer.FindEntry(ctx, util.FullPath(path))
-	crTime := time.Now()
-	if err == nil && existingEntry != nil {
-		crTime = existingEntry.Crtime
-	}
-
 	glog.V(4).Infoln("saving", path)
 	entry := &filer.Entry{
 		FullPath: util.FullPath(path),
 		Attr: filer.Attr{
 			Mtime:       time.Now(),
-			Crtime:      crTime,
+			Crtime:      time.Now(),
 			Mode:        os.FileMode(mode),
 			Uid:         OS_UID,
 			Gid:         OS_GID,
@@ -170,7 +163,8 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 			Md5:         md5bytes,
 			FileSize:    uint64(chunkOffset),
 		},
-		Chunks: fileChunks,
+		Chunks:  fileChunks,
+		Content: content,
 	}
 
 	filerResult = &FilerPostResult{
@@ -199,13 +193,14 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	return filerResult, replyerr
 }
 
-func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Request, reader io.Reader, chunkSize int32, fileName, contentType string, so *operation.StorageOption) ([]*filer_pb.FileChunk, hash.Hash, int64, error) {
+func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Request, reader io.Reader, chunkSize int32, fileName, contentType string, so *operation.StorageOption) ([]*filer_pb.FileChunk, hash.Hash, int64, error, []byte) {
 	var fileChunks []*filer_pb.FileChunk
 
 	md5Hash := md5.New()
 	var partReader = ioutil.NopCloser(io.TeeReader(reader, md5Hash))
 
 	chunkOffset := int64(0)
+	var smallContent, content []byte
 
 	for {
 		limitedReader := io.LimitReader(partReader, int64(chunkSize))
@@ -213,14 +208,15 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque
 		// assign one file id for one chunk
 		fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(so)
 		if assignErr != nil {
-			return nil, nil, 0, assignErr
+			return nil, nil, 0, assignErr, nil
 		}
 
 		// upload the chunk to the volume server
-		uploadResult, uploadErr := fs.doUpload(urlLocation, w, r, limitedReader, fileName, contentType, nil, auth)
+		uploadResult, uploadErr, data := fs.doUpload(urlLocation, w, r, limitedReader, fileName, contentType, nil, auth)
 		if uploadErr != nil {
-			return nil, nil, 0, uploadErr
+			return nil, nil, 0, uploadErr, nil
 		}
+		content = data
 
 		// if last chunk exhausted the reader exactly at the border
 		if uploadResult.Size == 0 {
@@ -240,10 +236,13 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque
 			break
 		}
 	}
-	return fileChunks, md5Hash, chunkOffset, nil
+	if chunkOffset < 2048 {
+		smallContent = content
+	}
+	return fileChunks, md5Hash, chunkOffset, nil, smallContent
 }
 
-func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *http.Request, limitedReader io.Reader, fileName string, contentType string, pairMap map[string]string, auth security.EncodedJwt) (*operation.UploadResult, error) {
+func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *http.Request, limitedReader io.Reader, fileName string, contentType string, pairMap map[string]string, auth security.EncodedJwt) (*operation.UploadResult, error, []byte) {
 
 	stats.FilerRequestCounter.WithLabelValues("postAutoChunkUpload").Inc()
 	start := time.Now()
@@ -251,8 +250,8 @@ func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *ht
 		stats.FilerRequestHistogram.WithLabelValues("postAutoChunkUpload").Observe(time.Since(start).Seconds())
 	}()
 
-	uploadResult, err, _ := operation.Upload(urlLocation, fileName, fs.option.Cipher, limitedReader, false, contentType, pairMap, auth)
-	return uploadResult, err
+	uploadResult, err, data := operation.Upload(urlLocation, fileName, fs.option.Cipher, limitedReader, false, contentType, pairMap, auth)
+	return uploadResult, err, data
 }
 
 func (fs *FilerServer) saveAsChunk(so *operation.StorageOption) filer.SaveDataAsChunkFunctionType {
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 03b718291..20a22d126 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -177,3 +177,16 @@ func (ms *MasterServer) LookupEcVolume(ctx context.Context, req *master_pb.Looku
 
 	return resp, nil
 }
+
+func (ms *MasterServer) VacuumVolume(ctx context.Context, req *master_pb.VacuumVolumeRequest) (*master_pb.VacuumVolumeResponse, error) {
+
+	if !ms.Topo.IsLeader() {
+		return nil, raft.NotLeaderError
+	}
+
+	resp := &master_pb.VacuumVolumeResponse{}
+
+	ms.Topo.Vacuum(ms.grpcDialOption, float64(req.GarbageThreshold), ms.preallocateSize)
+
+	return resp, nil
+}
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 2aecb140f..cfa3710a8 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -48,7 +48,7 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 	//   send .dat file
 	//   confirm size and timestamp
 	var volFileInfoResp *volume_server_pb.ReadVolumeFileStatusResponse
-	var volumeFileName, idxFileName, datFileName string
+	var dataBaseFileName, indexBaseFileName, idxFileName, datFileName string
 	err := operation.WithVolumeServerClient(req.SourceDataNode, vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 		var err error
 		volFileInfoResp, err = client.ReadVolumeFileStatus(context.Background(),
@@ -59,24 +59,25 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 			return fmt.Errorf("read volume file status failed, %v", err)
 		}
 
-		volumeFileName = storage.VolumeFileName(location.Directory, volFileInfoResp.Collection, int(req.VolumeId))
+		dataBaseFileName = storage.VolumeFileName(location.Directory, volFileInfoResp.Collection, int(req.VolumeId))
+		indexBaseFileName = storage.VolumeFileName(location.IdxDirectory, volFileInfoResp.Collection, int(req.VolumeId))
 
-		ioutil.WriteFile(volumeFileName+".note", []byte(fmt.Sprintf("copying from %s", req.SourceDataNode)), 0755)
+		ioutil.WriteFile(dataBaseFileName+".note", []byte(fmt.Sprintf("copying from %s", req.SourceDataNode)), 0755)
 
 		// println("source:", volFileInfoResp.String())
-		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, volumeFileName, ".dat", false, true); err != nil {
+		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".dat", false, true); err != nil {
 			return err
 		}
 
-		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, volumeFileName, ".idx", false, false); err != nil {
+		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, indexBaseFileName, ".idx", false, false); err != nil {
 			return err
 		}
 
-		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, volumeFileName, ".vif", false, true); err != nil {
+		if err := vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".vif", false, true); err != nil {
 			return err
 		}
 
-		os.Remove(volumeFileName + ".note")
+		os.Remove(dataBaseFileName + ".note")
 
 		return nil
 	})
@@ -84,18 +85,18 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 	if err != nil {
 		return nil, err
 	}
-	if volumeFileName == "" {
+	if dataBaseFileName == "" {
 		return nil, fmt.Errorf("not found volume %d file", req.VolumeId)
 	}
 
-	idxFileName = volumeFileName + ".idx"
-	datFileName = volumeFileName + ".dat"
+	idxFileName = indexBaseFileName + ".idx"
+	datFileName = dataBaseFileName + ".dat"
 
 	defer func() {
-		if err != nil && volumeFileName != "" {
+		if err != nil && dataBaseFileName != "" {
 			os.Remove(idxFileName)
 			os.Remove(datFileName)
-			os.Remove(volumeFileName + ".vif")
+			os.Remove(dataBaseFileName + ".vif")
 		}
 	}()
 
@@ -223,7 +224,7 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 		if uint32(v.CompactionRevision) != req.CompactionRevision && req.CompactionRevision != math.MaxUint32 {
 			return fmt.Errorf("volume %d is compacted", req.VolumeId)
 		}
-		fileName = v.FileName() + req.Ext
+		fileName = v.FileName(req.Ext)
 	} else {
 		baseFileName := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId)) + req.Ext
 		for _, location := range vs.store.Locations {
@@ -231,6 +232,10 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 			if util.FileExists(tName) {
 				fileName = tName
 			}
+			tName = util.Join(location.IdxDirectory, baseFileName)
+			if util.FileExists(tName) {
+				fileName = tName
+			}
 		}
 		if fileName == "" {
 			if req.IgnoreSourceFileNotFound {
diff --git a/weed/server/volume_grpc_erasure_coding.go b/weed/server/volume_grpc_erasure_coding.go
index 55e0261c8..2a7076e04 100644
--- a/weed/server/volume_grpc_erasure_coding.go
+++ b/weed/server/volume_grpc_erasure_coding.go
@@ -8,7 +8,6 @@ import (
 	"math"
 	"os"
 	"path"
-	"path/filepath"
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -27,7 +26,7 @@ import (
 Steps to apply erasure coding to .dat .idx files
 0. ensure the volume is readonly
 1. client call VolumeEcShardsGenerate to generate the .ecx and .ec00 ~ .ec13 files
-2. client ask master for possible servers to hold the ec files, at least 4 servers
+2. client ask master for possible servers to hold the ec files
 3. client call VolumeEcShardsCopy on above target servers to copy ec files from the source server
 4. target servers report the new ec files to the master
 5.   master stores vid -> [14]*DataNode
@@ -44,7 +43,7 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 	if v == nil {
 		return nil, fmt.Errorf("volume %d not found", req.VolumeId)
 	}
-	baseFileName := v.FileName()
+	baseFileName := v.DataFileName()
 
 	if v.Collection != req.Collection {
 		return nil, fmt.Errorf("existing collection:%v unexpected input: %v", v.Collection, req.Collection)
@@ -56,8 +55,8 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 	}
 
 	// write .ecx file
-	if err := erasure_coding.WriteSortedFileFromIdx(baseFileName, ".ecx"); err != nil {
-		return nil, fmt.Errorf("WriteSortedFileFromIdx %s: %v", baseFileName, err)
+	if err := erasure_coding.WriteSortedFileFromIdx(v.IndexFileName(), ".ecx"); err != nil {
+		return nil, fmt.Errorf("WriteSortedFileFromIdx %s: %v", v.IndexFileName(), err)
 	}
 
 	// write .vif files
@@ -78,17 +77,18 @@ func (vs *VolumeServer) VolumeEcShardsRebuild(ctx context.Context, req *volume_s
 	var rebuiltShardIds []uint32
 
 	for _, location := range vs.store.Locations {
-		if util.FileExists(path.Join(location.Directory, baseFileName+".ecx")) {
+		if util.FileExists(path.Join(location.IdxDirectory, baseFileName+".ecx")) {
 			// write .ec00 ~ .ec13 files
-			baseFileName = path.Join(location.Directory, baseFileName)
-			if generatedShardIds, err := erasure_coding.RebuildEcFiles(baseFileName); err != nil {
-				return nil, fmt.Errorf("RebuildEcFiles %s: %v", baseFileName, err)
+			dataBaseFileName := path.Join(location.Directory, baseFileName)
+			if generatedShardIds, err := erasure_coding.RebuildEcFiles(dataBaseFileName); err != nil {
+				return nil, fmt.Errorf("RebuildEcFiles %s: %v", dataBaseFileName, err)
 			} else {
 				rebuiltShardIds = generatedShardIds
 			}
 
-			if err := erasure_coding.RebuildEcxFile(baseFileName); err != nil {
-				return nil, fmt.Errorf("RebuildEcxFile %s: %v", baseFileName, err)
+			indexBaseFileName := path.Join(location.IdxDirectory, baseFileName)
+			if err := erasure_coding.RebuildEcxFile(indexBaseFileName); err != nil {
+				return nil, fmt.Errorf("RebuildEcxFile %s: %v", dataBaseFileName, err)
 			}
 
 			break
@@ -110,13 +110,14 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 		return nil, fmt.Errorf("no space left")
 	}
 
-	baseFileName := storage.VolumeFileName(location.Directory, req.Collection, int(req.VolumeId))
+	dataBaseFileName := storage.VolumeFileName(location.Directory, req.Collection, int(req.VolumeId))
+	indexBaseFileName := storage.VolumeFileName(location.IdxDirectory, req.Collection, int(req.VolumeId))
 
 	err := operation.WithVolumeServerClient(req.SourceDataNode, vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 
 		// copy ec data slices
 		for _, shardId := range req.ShardIds {
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, erasure_coding.ToExt(int(shardId)), false, false); err != nil {
+			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, erasure_coding.ToExt(int(shardId)), false, false); err != nil {
 				return err
 			}
 		}
@@ -124,7 +125,7 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 		if req.CopyEcxFile {
 
 			// copy ecx file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecx", false, false); err != nil {
+			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecx", false, false); err != nil {
 				return err
 			}
 			return nil
@@ -132,14 +133,14 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 		if req.CopyEcjFile {
 			// copy ecj file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".ecj", true, true); err != nil {
+			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecj", true, true); err != nil {
 				return err
 			}
 		}
 
 		if req.CopyVifFile {
 			// copy vif file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, baseFileName, ".vif", false, true); err != nil {
+			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, ".vif", false, true); err != nil {
 				return err
 			}
 		}
@@ -157,17 +158,19 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 // the shard should not be mounted before calling this.
 func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_server_pb.VolumeEcShardsDeleteRequest) (*volume_server_pb.VolumeEcShardsDeleteResponse, error) {
 
-	baseFilename := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId))
+	bName := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId))
 
 	glog.V(0).Infof("ec volume %d shard delete %v", req.VolumeId, req.ShardIds)
 
 	found := false
+	var indexBaseFilename, dataBaseFilename string
 	for _, location := range vs.store.Locations {
-		if util.FileExists(path.Join(location.Directory, baseFilename+".ecx")) {
+		if util.FileExists(path.Join(location.IdxDirectory, bName+".ecx")) {
 			found = true
-			baseFilename = path.Join(location.Directory, baseFilename)
+			indexBaseFilename = path.Join(location.IdxDirectory, bName)
+			dataBaseFilename = path.Join(location.Directory, bName)
 			for _, shardId := range req.ShardIds {
-				os.Remove(baseFilename + erasure_coding.ToExt(int(shardId)))
+				os.Remove(dataBaseFilename + erasure_coding.ToExt(int(shardId)))
 			}
 			break
 		}
@@ -182,12 +185,18 @@ func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_se
 	hasIdxFile := false
 	existingShardCount := 0
 
-	bName := filepath.Base(baseFilename)
 	for _, location := range vs.store.Locations {
 		fileInfos, err := ioutil.ReadDir(location.Directory)
 		if err != nil {
 			continue
 		}
+		if location.IdxDirectory != location.Directory {
+			idxFileInfos, err := ioutil.ReadDir(location.IdxDirectory)
+			if err != nil {
+				continue
+			}
+			fileInfos = append(fileInfos, idxFileInfos...)
+		}
 		for _, fileInfo := range fileInfos {
 			if fileInfo.Name() == bName+".ecx" || fileInfo.Name() == bName+".ecj" {
 				hasEcxFile = true
@@ -204,14 +213,14 @@ func (vs *VolumeServer) VolumeEcShardsDelete(ctx context.Context, req *volume_se
 	}
 
 	if hasEcxFile && existingShardCount == 0 {
-		if err := os.Remove(baseFilename + ".ecx"); err != nil {
+		if err := os.Remove(indexBaseFilename + ".ecx"); err != nil {
 			return nil, err
 		}
-		os.Remove(baseFilename + ".ecj")
+		os.Remove(indexBaseFilename + ".ecj")
 	}
 	if !hasIdxFile {
 		// .vif is used for ec volumes and normal volumes
-		os.Remove(baseFilename + ".vif")
+		os.Remove(dataBaseFilename + ".vif")
 	}
 
 	return &volume_server_pb.VolumeEcShardsDeleteResponse{}, nil
@@ -365,26 +374,26 @@ func (vs *VolumeServer) VolumeEcShardsToVolume(ctx context.Context, req *volume_
 	if !found {
 		return nil, fmt.Errorf("ec volume %d not found", req.VolumeId)
 	}
-	baseFileName := v.FileName()
 
 	if v.Collection != req.Collection {
 		return nil, fmt.Errorf("existing collection:%v unexpected input: %v", v.Collection, req.Collection)
 	}
 
+	dataBaseFileName, indexBaseFileName := v.DataBaseFileName(), v.IndexBaseFileName()
 	// calculate .dat file size
-	datFileSize, err := erasure_coding.FindDatFileSize(baseFileName)
+	datFileSize, err := erasure_coding.FindDatFileSize(dataBaseFileName, indexBaseFileName)
 	if err != nil {
-		return nil, fmt.Errorf("FindDatFileSize %s: %v", baseFileName, err)
+		return nil, fmt.Errorf("FindDatFileSize %s: %v", dataBaseFileName, err)
 	}
 
 	// write .dat file from .ec00 ~ .ec09 files
-	if err := erasure_coding.WriteDatFile(baseFileName, datFileSize); err != nil {
-		return nil, fmt.Errorf("WriteEcFiles %s: %v", baseFileName, err)
+	if err := erasure_coding.WriteDatFile(dataBaseFileName, datFileSize); err != nil {
+		return nil, fmt.Errorf("WriteEcFiles %s: %v", dataBaseFileName, err)
 	}
 
 	// write .idx file from .ecx and .ecj files
-	if err := erasure_coding.WriteIdxFileFromEcIndex(baseFileName); err != nil {
-		return nil, fmt.Errorf("WriteIdxFileFromEcIndex %s: %v", baseFileName, err)
+	if err := erasure_coding.WriteIdxFileFromEcIndex(indexBaseFileName); err != nil {
+		return nil, fmt.Errorf("WriteIdxFileFromEcIndex %s: %v", v.IndexBaseFileName(), err)
 	}
 
 	return &volume_server_pb.VolumeEcShardsToVolumeResponse{}, nil
diff --git a/weed/server/volume_grpc_tier_download.go b/weed/server/volume_grpc_tier_download.go
index 7b3982e40..73d8ae7cb 100644
--- a/weed/server/volume_grpc_tier_download.go
+++ b/weed/server/volume_grpc_tier_download.go
@@ -58,9 +58,9 @@ func (vs *VolumeServer) VolumeTierMoveDatFromRemote(req *volume_server_pb.Volume
 		})
 	}
 	// copy the data file
-	_, err := backendStorage.DownloadFile(v.FileName()+".dat", storageKey, fn)
+	_, 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)
+		return fmt.Errorf("backend %s copy file %s: %v", storageName, v.FileName(".dat"), err)
 	}
 
 	if req.KeepRemoteDatFile {
diff --git a/weed/server/volume_grpc_tier_upload.go b/weed/server/volume_grpc_tier_upload.go
index c9694df59..e51de5f1d 100644
--- a/weed/server/volume_grpc_tier_upload.go
+++ b/weed/server/volume_grpc_tier_upload.go
@@ -93,7 +93,7 @@ func (vs *VolumeServer) VolumeTierMoveDatToRemote(req *volume_server_pb.VolumeTi
 	}
 
 	if !req.KeepLocalDatFile {
-		os.Remove(v.FileName() + ".dat")
+		os.Remove(v.FileName(".dat"))
 	}
 
 	return nil
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 83df32fdd..468f75890 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -38,6 +38,7 @@ type VolumeServer struct {
 func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	port int, publicUrl string,
 	folders []string, maxCounts []int, minFreeSpacePercents []float32,
+	idxFolder string,
 	needleMapKind storage.NeedleMapType,
 	masterNodes []string, pulseSeconds int,
 	dataCenter string, rack string,
@@ -75,7 +76,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 
 	vs.checkWithMaster()
 
-	vs.store = storage.NewStore(vs.grpcDialOption, port, ip, publicUrl, folders, maxCounts, minFreeSpacePercents, vs.needleMapKind)
+	vs.store = storage.NewStore(vs.grpcDialOption, port, ip, publicUrl, folders, maxCounts, minFreeSpacePercents, idxFolder, vs.needleMapKind)
 	vs.guard = security.NewGuard(whiteList, signingKey, expiresAfterSec, readSigningKey, readExpiresAfterSec)
 
 	handleStaticResources(adminMux)
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index 15fd446e7..1c963b39c 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -159,8 +159,8 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			if n.Data, err = util.DecompressData(n.Data); err != nil {
 				glog.V(0).Infoln("ungzip error:", err, r.URL.Path)
 			}
-		} else if strings.Contains(r.Header.Get("Accept-Encoding"), "zstd") && util.IsZstdContent(n.Data) {
-			w.Header().Set("Content-Encoding", "zstd")
+			// } else if strings.Contains(r.Header.Get("Accept-Encoding"), "zstd") && util.IsZstdContent(n.Data) {
+			//	w.Header().Set("Content-Encoding", "zstd")
 		} else if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") && util.IsGzippedContent(n.Data) {
 			w.Header().Set("Content-Encoding", "gzip")
 		} else {
diff --git a/weed/server/webdav_server.go b/weed/server/webdav_server.go
index 3e9f882e3..f4b6a6f28 100644
--- a/weed/server/webdav_server.go
+++ b/weed/server/webdav_server.go
@@ -418,6 +418,7 @@ func (f *WebDavFile) Write(buf []byte) (int, error) {
 		return 0, fmt.Errorf("upload result: %v", uploadResult.Error)
 	}
 
+	f.entry.Content = nil
 	f.entry.Chunks = append(f.entry.Chunks, uploadResult.ToPbFileChunk(fileId, f.off))
 
 	err = f.fs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
diff --git a/weed/shell/command_collection_delete.go b/weed/shell/command_collection_delete.go
index 28b9cebbd..5777d5780 100644
--- a/weed/shell/command_collection_delete.go
+++ b/weed/shell/command_collection_delete.go
@@ -22,7 +22,7 @@ func (c *commandCollectionDelete) Name() string {
 func (c *commandCollectionDelete) Help() string {
 	return `delete specified collection
 
-	collection.delete -collectin <collection_name> -force
+	collection.delete -collection <collection_name> -force
 
 `
 }
diff --git a/weed/shell/command_ec_decode.go b/weed/shell/command_ec_decode.go
index 5f03df58c..da7c8844f 100644
--- a/weed/shell/command_ec_decode.go
+++ b/weed/shell/command_ec_decode.go
@@ -85,7 +85,7 @@ func doEcDecode(commandEnv *CommandEnv, topoInfo *master_pb.TopologyInfo, collec
 	}
 
 	// generate a normal volume
-	err = generateNormalVolume(commandEnv.option.GrpcDialOption, needle.VolumeId(vid), collection, targetNodeLocation)
+	err = generateNormalVolume(commandEnv.option.GrpcDialOption, vid, collection, targetNodeLocation)
 	if err != nil {
 		return fmt.Errorf("generate normal volume %d on %s: %v", vid, targetNodeLocation, err)
 	}
diff --git a/weed/shell/command_ec_encode.go b/weed/shell/command_ec_encode.go
index 5a8146954..b048b4cd3 100644
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@@ -99,13 +99,13 @@ func doEcEncode(commandEnv *CommandEnv, collection string, vid needle.VolumeId)
 	// fmt.Printf("found ec %d shards on %v\n", vid, locations)
 
 	// mark the volume as readonly
-	err = markVolumeReadonly(commandEnv.option.GrpcDialOption, needle.VolumeId(vid), locations)
+	err = markVolumeReadonly(commandEnv.option.GrpcDialOption, vid, locations)
 	if err != nil {
 		return fmt.Errorf("mark volume %d as readonly on %s: %v", vid, locations[0].Url, err)
 	}
 
 	// generate ec shards
-	err = generateEcShards(commandEnv.option.GrpcDialOption, needle.VolumeId(vid), collection, locations[0].Url)
+	err = generateEcShards(commandEnv.option.GrpcDialOption, vid, collection, locations[0].Url)
 	if err != nil {
 		return fmt.Errorf("generate ec shards for volume %d on %s: %v", vid, locations[0].Url, err)
 	}
diff --git a/weed/shell/command_fs_configure.go b/weed/shell/command_fs_configure.go
index 8def10d03..d530b2585 100644
--- a/weed/shell/command_fs_configure.go
+++ b/weed/shell/command_fs_configure.go
@@ -107,7 +107,7 @@ func (c *commandFsConfigure) Do(args []string, commandEnv *CommandEnv, writer io
 			if err != nil {
 				return fmt.Errorf("parse replication %s: %v", *replication, err)
 			}
-			if *volumeGrowthCount % rp.GetCopyCount() != 0 {
+			if *volumeGrowthCount%rp.GetCopyCount() != 0 {
 				return fmt.Errorf("volumeGrowthCount %d should be devided by replication copy count %d", *volumeGrowthCount, rp.GetCopyCount())
 			}
 		}
diff --git a/weed/shell/command_fs_meta_cat.go b/weed/shell/command_fs_meta_cat.go
index a097a3a4e..e0525defa 100644
--- a/weed/shell/command_fs_meta_cat.go
+++ b/weed/shell/command_fs_meta_cat.go
@@ -72,8 +72,9 @@ func (c *commandFsMetaCat) Do(args []string, commandEnv *CommandEnv, writer io.W
 
 		bytes, _ := proto.Marshal(respLookupEntry.Entry)
 		gzippedBytes, _ := util.GzipData(bytes)
-		zstdBytes, _ := util.ZstdData(bytes)
-		fmt.Fprintf(writer, "chunks %d meta size: %d gzip:%d zstd:%d\n", len(respLookupEntry.Entry.Chunks), len(bytes), len(gzippedBytes), len(zstdBytes))
+		// zstdBytes, _ := util.ZstdData(bytes)
+		// fmt.Fprintf(writer, "chunks %d meta size: %d gzip:%d zstd:%d\n", len(respLookupEntry.Entry.Chunks), len(bytes), len(gzippedBytes), len(zstdBytes))
+		fmt.Fprintf(writer, "chunks %d meta size: %d gzip:%d\n", len(respLookupEntry.Entry.Chunks), len(bytes), len(gzippedBytes))
 
 		return nil
 
diff --git a/weed/shell/command_volume_balance.go b/weed/shell/command_volume_balance.go
index 53222ca29..928dec02a 100644
--- a/weed/shell/command_volume_balance.go
+++ b/weed/shell/command_volume_balance.go
@@ -306,16 +306,16 @@ func isGoodMove(placement *super_block.ReplicaPlacement, existingReplicas []*Vol
 	dcs[targetNode.dc] = true
 	racks[fmt.Sprintf("%s %s", targetNode.dc, targetNode.rack)]++
 
-	if len(dcs) > placement.DiffDataCenterCount+1 {
+	if len(dcs) != placement.DiffDataCenterCount+1 {
 		return false
 	}
 
-	if len(racks) > placement.DiffRackCount+placement.DiffDataCenterCount+1 {
+	if len(racks) != placement.DiffRackCount+placement.DiffDataCenterCount+1 {
 		return false
 	}
 
 	for _, sameRackCount := range racks {
-		if sameRackCount > placement.SameRackCount+1 {
+		if sameRackCount != placement.SameRackCount+1 {
 			return false
 		}
 	}
diff --git a/weed/shell/command_volume_balance_test.go b/weed/shell/command_volume_balance_test.go
index 9e154dc00..696bc7fac 100644
--- a/weed/shell/command_volume_balance_test.go
+++ b/weed/shell/command_volume_balance_test.go
@@ -20,6 +20,22 @@ func TestIsGoodMove(t *testing.T) {
 
 	var tests = []testMoveCase{
 
+		{
+			name:        "test 100 move to wrong data centers",
+			replication: "100",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc2", "r2", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+			},
+			sourceLocation: location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+			targetLocation: location{"dc2", "r3", &master_pb.DataNodeInfo{Id: "dn3"}},
+			expected:       false,
+		},
+
 		{
 			name:        "test 100 move to spread into proper data centers",
 			replication: "100",
diff --git a/weed/shell/command_volume_fsck.go b/weed/shell/command_volume_fsck.go
index 4031cd237..75b0f28da 100644
--- a/weed/shell/command_volume_fsck.go
+++ b/weed/shell/command_volume_fsck.go
@@ -157,12 +157,12 @@ func (c *commandVolumeFsck) collectOneVolumeFileIds(tempFolder string, volumeId
 			IgnoreSourceFileNotFound: false,
 		})
 		if err != nil {
-			return fmt.Errorf("failed to start copying volume %d.idx: %v", volumeId, err)
+			return fmt.Errorf("failed to start copying volume %d%s: %v", volumeId, ext, err)
 		}
 
 		err = writeToFile(copyFileClient, getVolumeFileIdFile(tempFolder, volumeId))
 		if err != nil {
-			return fmt.Errorf("failed to copy %d.idx from %s: %v", volumeId, vinfo.server, err)
+			return fmt.Errorf("failed to copy %d%s from %s: %v", volumeId, ext, vinfo.server, err)
 		}
 
 		return nil
diff --git a/weed/shell/command_volume_vacuum.go b/weed/shell/command_volume_vacuum.go
new file mode 100644
index 000000000..56f85f4fe
--- /dev/null
+++ b/weed/shell/command_volume_vacuum.go
@@ -0,0 +1,53 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+func init() {
+	Commands = append(Commands, &commandVacuum{})
+}
+
+type commandVacuum struct {
+}
+
+func (c *commandVacuum) Name() string {
+	return "volume.vacuum"
+}
+
+func (c *commandVacuum) Help() string {
+	return `compact volumes if deleted entries are more than the limit
+
+	volume.vacuum [-garbageThreshold=0.3]
+
+`
+}
+
+func (c *commandVacuum) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	if err = commandEnv.confirmIsLocked(); err != nil {
+		return
+	}
+
+	volumeVacuumCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	garbageThreshold := volumeVacuumCommand.Float64("garbageThreshold", 0.3, "vacuum when garbage is more than this limit")
+	if err = volumeVacuumCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	err = commandEnv.MasterClient.WithClient(func(client master_pb.SeaweedClient) error {
+		_, err = client.VacuumVolume(context.Background(), &master_pb.VacuumVolumeRequest{
+			GarbageThreshold: float32(*garbageThreshold),
+		})
+		return err
+	})
+	if err != nil {
+		return
+	}
+
+	return nil
+}
diff --git a/weed/storage/disk_location.go b/weed/storage/disk_location.go
index 775ebf092..2d4d120af 100644
--- a/weed/storage/disk_location.go
+++ b/weed/storage/disk_location.go
@@ -18,6 +18,7 @@ import (
 
 type DiskLocation struct {
 	Directory              string
+	IdxDirectory           string
 	MaxVolumeCount         int
 	OriginalMaxVolumeCount int
 	MinFreeSpacePercent    float32
@@ -31,23 +32,34 @@ type DiskLocation struct {
 	isDiskSpaceLow bool
 }
 
-func NewDiskLocation(dir string, maxVolumeCount int, minFreeSpacePercent float32) *DiskLocation {
-	location := &DiskLocation{Directory: dir, MaxVolumeCount: maxVolumeCount, OriginalMaxVolumeCount: maxVolumeCount, MinFreeSpacePercent: minFreeSpacePercent}
+func NewDiskLocation(dir string, maxVolumeCount int, minFreeSpacePercent float32, idxDir string) *DiskLocation {
+	dir = util.ResolvePath(dir)
+	if idxDir == "" {
+		idxDir = dir
+	} else {
+		idxDir = util.ResolvePath(idxDir)
+	}
+	location := &DiskLocation{
+		Directory:              dir,
+		IdxDirectory:           idxDir,
+		MaxVolumeCount:         maxVolumeCount,
+		OriginalMaxVolumeCount: maxVolumeCount,
+		MinFreeSpacePercent:    minFreeSpacePercent,
+	}
 	location.volumes = make(map[needle.VolumeId]*Volume)
 	location.ecVolumes = make(map[needle.VolumeId]*erasure_coding.EcVolume)
 	go location.CheckDiskSpace()
 	return location
 }
 
-func (l *DiskLocation) volumeIdFromPath(dir os.FileInfo) (needle.VolumeId, string, error) {
-	name := dir.Name()
-	if !dir.IsDir() && strings.HasSuffix(name, ".idx") {
-		base := name[:len(name)-len(".idx")]
+func volumeIdFromFileName(filename string) (needle.VolumeId, string, error) {
+	if strings.HasSuffix(filename, ".idx") || strings.HasSuffix(filename, ".vif") {
+		base := filename[:len(filename)-4]
 		collection, volumeId, err := parseCollectionVolumeId(base)
 		return volumeId, collection, err
 	}
 
-	return 0, "", fmt.Errorf("Path is not a volume: %s", name)
+	return 0, "", fmt.Errorf("file is not a volume: %s", filename)
 }
 
 func parseCollectionVolumeId(base string) (collection string, vid needle.VolumeId, err error) {
@@ -60,54 +72,63 @@ func parseCollectionVolumeId(base string) (collection string, vid needle.VolumeI
 }
 
 func (l *DiskLocation) loadExistingVolume(fileInfo os.FileInfo, needleMapKind NeedleMapType) bool {
-	name := fileInfo.Name()
-	if !fileInfo.IsDir() && strings.HasSuffix(name, ".idx") {
-		name := name[:len(name)-len(".idx")]
-		noteFile := l.Directory + "/" + name + ".note"
-		if util.FileExists(noteFile) {
-			note, _ := ioutil.ReadFile(noteFile)
-			glog.Warningf("volume %s was not completed: %s", name, string(note))
-			removeVolumeFiles(l.Directory + "/" + name)
-			return false
-		}
-		vid, collection, err := l.volumeIdFromPath(fileInfo)
-		if err != nil {
-			glog.Warningf("get volume id failed, %s, err : %s", name, err)
-			return false
-		}
-
-		// void loading one volume more than once
-		l.volumesLock.RLock()
-		_, found := l.volumes[vid]
-		l.volumesLock.RUnlock()
-		if found {
-			glog.V(1).Infof("loaded volume, %v", vid)
-			return true
-		}
-
-		v, e := NewVolume(l.Directory, collection, vid, needleMapKind, nil, nil, 0, 0)
-		if e != nil {
-			glog.V(0).Infof("new volume %s error %s", name, e)
-			return false
-		}
+	basename := fileInfo.Name()
+	if fileInfo.IsDir() {
+		return false
+	}
+	if !strings.HasSuffix(basename, ".idx") && !strings.HasSuffix(basename, ".vif") {
+		return false
+	}
+	volumeName := basename[:len(basename)-4]
+
+	// check for incomplete volume
+	noteFile := l.Directory + "/" + volumeName + ".note"
+	if util.FileExists(noteFile) {
+		note, _ := ioutil.ReadFile(noteFile)
+		glog.Warningf("volume %s was not completed: %s", volumeName, string(note))
+		removeVolumeFiles(l.Directory + "/" + volumeName)
+		removeVolumeFiles(l.IdxDirectory + "/" + volumeName)
+		return false
+	}
 
-		l.SetVolume(vid, v)
+	// parse out collection, volume id
+	vid, collection, err := volumeIdFromFileName(basename)
+	if err != nil {
+		glog.Warningf("get volume id failed, %s, err : %s", volumeName, err)
+		return false
+	}
 
-		size, _, _ := v.FileStat()
-		glog.V(0).Infof("data file %s, replicaPlacement=%s v=%d size=%d ttl=%s",
-			l.Directory+"/"+name+".dat", v.ReplicaPlacement, v.Version(), size, v.Ttl.String())
+	// avoid loading one volume more than once
+	l.volumesLock.RLock()
+	_, found := l.volumes[vid]
+	l.volumesLock.RUnlock()
+	if found {
+		glog.V(1).Infof("loaded volume, %v", vid)
 		return true
 	}
-	return false
+
+	// load the volume
+	v, e := NewVolume(l.Directory, l.IdxDirectory, collection, vid, needleMapKind, nil, nil, 0, 0)
+	if e != nil {
+		glog.V(0).Infof("new volume %s error %s", volumeName, e)
+		return false
+	}
+
+	l.SetVolume(vid, v)
+
+	size, _, _ := v.FileStat()
+	glog.V(0).Infof("data file %s, replicaPlacement=%s v=%d size=%d ttl=%s",
+		l.Directory+"/"+volumeName+".dat", v.ReplicaPlacement, v.Version(), size, v.Ttl.String())
+	return true
 }
 
 func (l *DiskLocation) concurrentLoadingVolumes(needleMapKind NeedleMapType, concurrency int) {
 
 	task_queue := make(chan os.FileInfo, 10*concurrency)
 	go func() {
-		if dirs, err := ioutil.ReadDir(l.Directory); err == nil {
-			for _, dir := range dirs {
-				task_queue <- dir
+		if fileInfos, err := ioutil.ReadDir(l.Directory); err == nil {
+			for _, fi := range fileInfos {
+				task_queue <- fi
 			}
 		}
 		close(task_queue)
@@ -118,8 +139,8 @@ func (l *DiskLocation) concurrentLoadingVolumes(needleMapKind NeedleMapType, con
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			for dir := range task_queue {
-				_ = l.loadExistingVolume(dir, needleMapKind)
+			for fi := range task_queue {
+				_ = l.loadExistingVolume(fi, needleMapKind)
 			}
 		}()
 	}
@@ -285,7 +306,7 @@ func (l *DiskLocation) Close() {
 func (l *DiskLocation) LocateVolume(vid needle.VolumeId) (os.FileInfo, bool) {
 	if fileInfos, err := ioutil.ReadDir(l.Directory); err == nil {
 		for _, fileInfo := range fileInfos {
-			volId, _, err := l.volumeIdFromPath(fileInfo)
+			volId, _, err := volumeIdFromFileName(fileInfo.Name())
 			if vid == volId && err == nil {
 				return fileInfo, true
 			}
diff --git a/weed/storage/disk_location_ec.go b/weed/storage/disk_location_ec.go
index 07fab96d9..d1237b40f 100644
--- a/weed/storage/disk_location_ec.go
+++ b/weed/storage/disk_location_ec.go
@@ -68,7 +68,7 @@ func (l *DiskLocation) LoadEcShard(collection string, vid needle.VolumeId, shard
 	defer l.ecVolumesLock.Unlock()
 	ecVolume, found := l.ecVolumes[vid]
 	if !found {
-		ecVolume, err = erasure_coding.NewEcVolume(l.Directory, collection, vid)
+		ecVolume, err = erasure_coding.NewEcVolume(l.Directory, l.IdxDirectory, collection, vid)
 		if err != nil {
 			return fmt.Errorf("failed to create ec volume %d: %v", vid, err)
 		}
@@ -122,6 +122,13 @@ func (l *DiskLocation) loadAllEcShards() (err error) {
 	if err != nil {
 		return fmt.Errorf("load all ec shards in dir %s: %v", l.Directory, err)
 	}
+	if l.IdxDirectory != l.Directory {
+		indexFileInfos, err := ioutil.ReadDir(l.IdxDirectory)
+		if err != nil {
+			return fmt.Errorf("load all ec shards in dir %s: %v", l.IdxDirectory, err)
+		}
+		fileInfos = append(fileInfos, indexFileInfos...)
+	}
 
 	sort.Slice(fileInfos, func(i, j int) bool {
 		return fileInfos[i].Name() < fileInfos[j].Name()
diff --git a/weed/storage/erasure_coding/ec_decoder.go b/weed/storage/erasure_coding/ec_decoder.go
index 795a7d523..bc86d9c04 100644
--- a/weed/storage/erasure_coding/ec_decoder.go
+++ b/weed/storage/erasure_coding/ec_decoder.go
@@ -45,14 +45,14 @@ func WriteIdxFileFromEcIndex(baseFileName string) (err error) {
 // FindDatFileSize calculate .dat file size from max offset entry
 // there may be extra deletions after that entry
 // but they are deletions anyway
-func FindDatFileSize(baseFileName string) (datSize int64, err error) {
+func FindDatFileSize(dataBaseFileName, indexBaseFileName string) (datSize int64, err error) {
 
-	version, err := readEcVolumeVersion(baseFileName)
+	version, err := readEcVolumeVersion(dataBaseFileName)
 	if err != nil {
-		return 0, fmt.Errorf("read ec volume %s version: %v", baseFileName, err)
+		return 0, fmt.Errorf("read ec volume %s version: %v", dataBaseFileName, err)
 	}
 
-	err = iterateEcxFile(baseFileName, func(key types.NeedleId, offset types.Offset, size types.Size) error {
+	err = iterateEcxFile(indexBaseFileName, func(key types.NeedleId, offset types.Offset, size types.Size) error {
 
 		if size.IsDeleted() {
 			return nil
diff --git a/weed/storage/erasure_coding/ec_volume.go b/weed/storage/erasure_coding/ec_volume.go
index 71fe884df..2183e43d6 100644
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@@ -25,6 +25,7 @@ type EcVolume struct {
 	VolumeId                  needle.VolumeId
 	Collection                string
 	dir                       string
+	dirIdx                    string
 	ecxFile                   *os.File
 	ecxFileSize               int64
 	ecxCreatedAt              time.Time
@@ -37,33 +38,34 @@ type EcVolume struct {
 	ecjFileAccessLock         sync.Mutex
 }
 
-func NewEcVolume(dir string, collection string, vid needle.VolumeId) (ev *EcVolume, err error) {
-	ev = &EcVolume{dir: dir, Collection: collection, VolumeId: vid}
+func NewEcVolume(dir string, dirIdx string, collection string, vid needle.VolumeId) (ev *EcVolume, err error) {
+	ev = &EcVolume{dir: dir, dirIdx: dirIdx, Collection: collection, VolumeId: vid}
 
-	baseFileName := EcShardFileName(collection, dir, int(vid))
+	dataBaseFileName := EcShardFileName(collection, dir, int(vid))
+	indexBaseFileName := EcShardFileName(collection, dirIdx, int(vid))
 
 	// open ecx file
-	if ev.ecxFile, err = os.OpenFile(baseFileName+".ecx", os.O_RDWR, 0644); err != nil {
-		return nil, fmt.Errorf("cannot open ec volume index %s.ecx: %v", baseFileName, err)
+	if ev.ecxFile, err = os.OpenFile(indexBaseFileName+".ecx", os.O_RDWR, 0644); err != nil {
+		return nil, fmt.Errorf("cannot open ec volume index %s.ecx: %v", indexBaseFileName, err)
 	}
 	ecxFi, statErr := ev.ecxFile.Stat()
 	if statErr != nil {
-		return nil, fmt.Errorf("can not stat ec volume index %s.ecx: %v", baseFileName, statErr)
+		return nil, fmt.Errorf("can not stat ec volume index %s.ecx: %v", indexBaseFileName, statErr)
 	}
 	ev.ecxFileSize = ecxFi.Size()
 	ev.ecxCreatedAt = ecxFi.ModTime()
 
 	// open ecj file
-	if ev.ecjFile, err = os.OpenFile(baseFileName+".ecj", os.O_RDWR|os.O_CREATE, 0644); err != nil {
-		return nil, fmt.Errorf("cannot open ec volume journal %s.ecj: %v", baseFileName, err)
+	if ev.ecjFile, err = os.OpenFile(indexBaseFileName+".ecj", os.O_RDWR|os.O_CREATE, 0644); err != nil {
+		return nil, fmt.Errorf("cannot open ec volume journal %s.ecj: %v", indexBaseFileName, err)
 	}
 
 	// read volume info
 	ev.Version = needle.Version3
-	if volumeInfo, found, _ := pb.MaybeLoadVolumeInfo(baseFileName + ".vif"); found {
+	if volumeInfo, found, _ := pb.MaybeLoadVolumeInfo(dataBaseFileName + ".vif"); found {
 		ev.Version = needle.Version(volumeInfo.Version)
 	} else {
-		pb.SaveVolumeInfo(baseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(ev.Version)})
+		pb.SaveVolumeInfo(dataBaseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(ev.Version)})
 	}
 
 	ev.ShardLocations = make(map[ShardId][]string)
@@ -134,15 +136,26 @@ func (ev *EcVolume) Destroy() {
 	for _, s := range ev.Shards {
 		s.Destroy()
 	}
-	os.Remove(ev.FileName() + ".ecx")
-	os.Remove(ev.FileName() + ".ecj")
-	os.Remove(ev.FileName() + ".vif")
+	os.Remove(ev.FileName(".ecx"))
+	os.Remove(ev.FileName(".ecj"))
+	os.Remove(ev.FileName(".vif"))
 }
 
-func (ev *EcVolume) FileName() string {
+func (ev *EcVolume) FileName(ext string) string {
+	switch ext {
+	case ".ecx", ".ecj":
+		return ev.IndexBaseFileName() + ext
+	}
+	// .vif
+	return ev.DataBaseFileName() + ext
+}
 
+func (ev *EcVolume) DataBaseFileName() string {
 	return EcShardFileName(ev.Collection, ev.dir, int(ev.VolumeId))
+}
 
+func (ev *EcVolume) IndexBaseFileName() string {
+	return EcShardFileName(ev.Collection, ev.dirIdx, int(ev.VolumeId))
 }
 
 func (ev *EcVolume) ShardSize() uint64 {
diff --git a/weed/storage/needle/needle_parse_upload.go b/weed/storage/needle/needle_parse_upload.go
index 4d244046e..8f457be1d 100644
--- a/weed/storage/needle/needle_parse_upload.go
+++ b/weed/storage/needle/needle_parse_upload.go
@@ -18,12 +18,12 @@ import (
 )
 
 type ParsedUpload struct {
-	FileName         string
-	Data             []byte
-	MimeType         string
-	PairMap          map[string]string
-	IsGzipped        bool
-	IsZstd           bool
+	FileName  string
+	Data      []byte
+	MimeType  string
+	PairMap   map[string]string
+	IsGzipped bool
+	// IsZstd           bool
 	OriginalDataSize int
 	ModifiedTime     uint64
 	Ttl              *TTL
@@ -100,7 +100,7 @@ func ParseUpload(r *http.Request, sizeLimit int64) (pu *ParsedUpload, e error) {
 
 func parsePut(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error) {
 	pu.IsGzipped = r.Header.Get("Content-Encoding") == "gzip"
-	pu.IsZstd = r.Header.Get("Content-Encoding") == "zstd"
+	// pu.IsZstd = r.Header.Get("Content-Encoding") == "zstd"
 	pu.MimeType = r.Header.Get("Content-Type")
 	pu.FileName = ""
 	pu.Data, e = ioutil.ReadAll(io.LimitReader(r.Body, sizeLimit+1))
@@ -194,7 +194,7 @@ func parseMultipart(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error
 		}
 
 		pu.IsGzipped = part.Header.Get("Content-Encoding") == "gzip"
-		pu.IsZstd = part.Header.Get("Content-Encoding") == "zstd"
+		// pu.IsZstd = part.Header.Get("Content-Encoding") == "zstd"
 	}
 
 	return
diff --git a/weed/storage/needle_map.go b/weed/storage/needle_map.go
index e91856dfe..9f331267d 100644
--- a/weed/storage/needle_map.go
+++ b/weed/storage/needle_map.go
@@ -2,9 +2,11 @@ package storage
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"sync"
 
+	"github.com/chrislusf/seaweedfs/weed/storage/idx"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 )
@@ -31,6 +33,7 @@ type NeedleMapper interface {
 	MaxFileKey() NeedleId
 	IndexFileSize() uint64
 	Sync() error
+	ReadIndexEntry(n int64) (key NeedleId, offset Offset, size Size, err error)
 }
 
 type baseNeedleMapper struct {
@@ -64,3 +67,20 @@ func (nm *baseNeedleMapper) appendToIndexFile(key NeedleId, offset Offset, size
 func (nm *baseNeedleMapper) Sync() error {
 	return nm.indexFile.Sync()
 }
+
+func (nm *baseNeedleMapper) ReadIndexEntry(n int64) (key NeedleId, offset Offset, size Size, err error) {
+	bytes := make([]byte, NeedleMapEntrySize)
+	var readCount int
+	if readCount, err = nm.indexFile.ReadAt(bytes, n*NeedleMapEntrySize); err != nil {
+		if err == io.EOF {
+			if readCount == NeedleMapEntrySize {
+				err = nil
+			}
+		}
+		if err != nil {
+			return
+		}
+	}
+	key, offset, size = idx.IdxFileEntry(bytes)
+	return
+}
diff --git a/weed/storage/needle_map_sorted_file.go b/weed/storage/needle_map_sorted_file.go
index 1ca113ca9..3449ff9dc 100644
--- a/weed/storage/needle_map_sorted_file.go
+++ b/weed/storage/needle_map_sorted_file.go
@@ -16,18 +16,18 @@ type SortedFileNeedleMap struct {
 	dbFileSize   int64
 }
 
-func NewSortedFileNeedleMap(baseFileName string, indexFile *os.File) (m *SortedFileNeedleMap, err error) {
-	m = &SortedFileNeedleMap{baseFileName: baseFileName}
+func NewSortedFileNeedleMap(indexBaseFileName string, indexFile *os.File) (m *SortedFileNeedleMap, err error) {
+	m = &SortedFileNeedleMap{baseFileName: indexBaseFileName}
 	m.indexFile = indexFile
-	fileName := baseFileName + ".sdx"
+	fileName := indexBaseFileName + ".sdx"
 	if !isSortedFileFresh(fileName, indexFile) {
 		glog.V(0).Infof("Start to Generate %s from %s", fileName, indexFile.Name())
-		erasure_coding.WriteSortedFileFromIdx(baseFileName, ".sdx")
+		erasure_coding.WriteSortedFileFromIdx(indexBaseFileName, ".sdx")
 		glog.V(0).Infof("Finished Generating %s from %s", fileName, indexFile.Name())
 	}
 	glog.V(1).Infof("Opening %s...", fileName)
 
-	if m.dbFile, err = os.Open(baseFileName + ".sdx"); err != nil {
+	if m.dbFile, err = os.Open(indexBaseFileName + ".sdx"); err != nil {
 		return
 	}
 	dbStat, _ := m.dbFile.Stat()
diff --git a/weed/storage/store.go b/weed/storage/store.go
index 7f2415448..e64dd8fab 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -16,7 +16,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
-	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 const (
@@ -53,11 +52,11 @@ func (s *Store) String() (str string) {
 	return
 }
 
-func NewStore(grpcDialOption grpc.DialOption, port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int, minFreeSpacePercents []float32, needleMapKind NeedleMapType) (s *Store) {
+func NewStore(grpcDialOption grpc.DialOption, port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int, minFreeSpacePercents []float32, idxFolder string, needleMapKind NeedleMapType) (s *Store) {
 	s = &Store{grpcDialOption: grpcDialOption, Port: port, Ip: ip, PublicUrl: publicUrl, NeedleMapType: needleMapKind}
 	s.Locations = make([]*DiskLocation, 0)
 	for i := 0; i < len(dirnames); i++ {
-		location := NewDiskLocation(util.ResolvePath(dirnames[i]), maxVolumeCounts[i], minFreeSpacePercents[i])
+		location := NewDiskLocation(dirnames[i], maxVolumeCounts[i], minFreeSpacePercents[i], idxFolder)
 		location.loadExistingVolumes(needleMapKind)
 		s.Locations = append(s.Locations, location)
 		stats.VolumeServerMaxVolumeCounter.Add(float64(maxVolumeCounts[i]))
@@ -122,7 +121,7 @@ func (s *Store) addVolume(vid needle.VolumeId, collection string, needleMapKind
 	if location := s.FindFreeLocation(); location != nil {
 		glog.V(0).Infof("In dir %s adds volume:%v collection:%s replicaPlacement:%v ttl:%v",
 			location.Directory, vid, collection, replicaPlacement, ttl)
-		if volume, err := NewVolume(location.Directory, collection, vid, needleMapKind, replicaPlacement, ttl, preallocate, memoryMapMaxSizeMb); err == nil {
+		if volume, err := NewVolume(location.Directory, location.IdxDirectory, collection, vid, needleMapKind, replicaPlacement, ttl, preallocate, memoryMapMaxSizeMb); err == nil {
 			location.SetVolume(vid, volume)
 			glog.V(0).Infof("add volume %d", vid)
 			s.NewVolumesChan <- master_pb.VolumeShortInformationMessage{
@@ -222,7 +221,12 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 				if v.expiredLongEnough(MAX_TTL_VOLUME_REMOVAL_DELAY) {
 					deleteVids = append(deleteVids, v.Id)
 				} else {
-					glog.V(0).Infoln("volume", v.Id, "is expired.")
+					glog.V(0).Infof("volume %d is expired", v.Id)
+				}
+				if v.lastIoError != nil {
+					deleteVids = append(deleteVids, v.Id)
+				} else {
+					glog.Warningf("volume %d has IO error", v.Id)
 				}
 			}
 			collectionVolumeSize[v.Collection] += volumeMessage.Size
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index a7a963a59..c726e7f11 100644
--- a/weed/storage/volume.go
+++ b/weed/storage/volume.go
@@ -21,6 +21,7 @@ import (
 type Volume struct {
 	Id                 needle.VolumeId
 	dir                string
+	dirIdx             string
 	Collection         string
 	DataBackend        backend.BackendStorageFile
 	nm                 NeedleMapper
@@ -45,11 +46,13 @@ type Volume struct {
 
 	volumeInfo *volume_server_pb.VolumeInfo
 	location   *DiskLocation
+
+	lastIoError     error
 }
 
-func NewVolume(dirname string, collection string, id needle.VolumeId, needleMapKind NeedleMapType, replicaPlacement *super_block.ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) (v *Volume, e error) {
+func NewVolume(dirname string, dirIdx string, collection string, id needle.VolumeId, needleMapKind NeedleMapType, replicaPlacement *super_block.ReplicaPlacement, ttl *needle.TTL, preallocate int64, memoryMapMaxSizeMb uint32) (v *Volume, e error) {
 	// if replicaPlacement is nil, the superblock will be loaded from disk
-	v = &Volume{dir: dirname, Collection: collection, Id: id, MemoryMapMaxSizeMb: memoryMapMaxSizeMb,
+	v = &Volume{dir: dirname, dirIdx: dirIdx, Collection: collection, Id: id, MemoryMapMaxSizeMb: memoryMapMaxSizeMb,
 		asyncRequestsChan: make(chan *needle.AsyncRequest, 128)}
 	v.SuperBlock = super_block.SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
 	v.needleMapKind = needleMapKind
@@ -61,7 +64,7 @@ func NewVolume(dirname string, collection string, id needle.VolumeId, needleMapK
 func (v *Volume) String() string {
 	v.noWriteLock.RLock()
 	defer v.noWriteLock.RUnlock()
-	return fmt.Sprintf("Id:%v, dir:%s, Collection:%s, dataFile:%v, nm:%v, noWrite:%v canDelete:%v", v.Id, v.dir, v.Collection, v.DataBackend, v.nm, v.noWriteOrDelete || v.noWriteCanDelete, v.noWriteCanDelete)
+	return fmt.Sprintf("Id:%v dir:%s dirIdx:%s Collection:%s dataFile:%v nm:%v noWrite:%v canDelete:%v", v.Id, v.dir, v.dirIdx, v.Collection, v.DataBackend, v.nm, v.noWriteOrDelete || v.noWriteCanDelete, v.noWriteCanDelete)
 }
 
 func VolumeFileName(dir string, collection string, id int) (fileName string) {
@@ -74,10 +77,23 @@ func VolumeFileName(dir string, collection string, id int) (fileName string) {
 	return
 }
 
-func (v *Volume) FileName() (fileName string) {
+func (v *Volume) DataFileName() (fileName string) {
 	return VolumeFileName(v.dir, v.Collection, int(v.Id))
 }
 
+func (v *Volume) IndexFileName() (fileName string) {
+	return VolumeFileName(v.dirIdx, v.Collection, int(v.Id))
+}
+
+func (v *Volume) FileName(ext string) (fileName string) {
+	switch ext {
+	case ".idx", ".cpx", ".ldb":
+		return VolumeFileName(v.dirIdx, v.Collection, int(v.Id)) + ext
+	}
+	// .dat, .cpd, .vif
+	return VolumeFileName(v.dir, v.Collection, int(v.Id)) + ext
+}
+
 func (v *Volume) Version() needle.Version {
 	if v.volumeInfo.Version != 0 {
 		v.SuperBlock.Version = needle.Version(v.volumeInfo.Version)
diff --git a/weed/storage/volume_backup.go b/weed/storage/volume_backup.go
index 595bd8a35..9aeb10f69 100644
--- a/weed/storage/volume_backup.go
+++ b/weed/storage/volume_backup.go
@@ -124,9 +124,9 @@ func (v *Volume) findLastAppendAtNs() (uint64, error) {
 }
 
 func (v *Volume) locateLastAppendEntry() (Offset, error) {
-	indexFile, e := os.OpenFile(v.FileName()+".idx", os.O_RDONLY, 0644)
+	indexFile, e := os.OpenFile(v.FileName(".idx"), os.O_RDONLY, 0644)
 	if e != nil {
-		return Offset{}, fmt.Errorf("cannot read %s.idx: %v", v.FileName(), e)
+		return Offset{}, fmt.Errorf("cannot read %s: %v", v.FileName(".idx"), e)
 	}
 	defer indexFile.Close()
 
@@ -156,9 +156,9 @@ func (v *Volume) readAppendAtNs(offset Offset) (uint64, error) {
 
 	n, _, bodyLength, err := needle.ReadNeedleHeader(v.DataBackend, v.SuperBlock.Version, offset.ToAcutalOffset())
 	if err != nil {
-		return 0, fmt.Errorf("ReadNeedleHeader: %v", err)
+		return 0, fmt.Errorf("ReadNeedleHeader %s [%d,%d): %v", v.DataBackend.Name(), offset.ToAcutalOffset(), offset.ToAcutalOffset()+NeedleHeaderSize, err)
 	}
-	_, err = n.ReadNeedleBody(v.DataBackend, v.SuperBlock.Version, offset.ToAcutalOffset()+int64(NeedleHeaderSize), bodyLength)
+	_, err = n.ReadNeedleBody(v.DataBackend, v.SuperBlock.Version, offset.ToAcutalOffset()+NeedleHeaderSize, bodyLength)
 	if err != nil {
 		return 0, fmt.Errorf("ReadNeedleBody offset %d, bodyLength %d: %v", offset.ToAcutalOffset(), bodyLength, err)
 	}
@@ -168,25 +168,13 @@ func (v *Volume) readAppendAtNs(offset Offset) (uint64, error) {
 
 // on server side
 func (v *Volume) BinarySearchByAppendAtNs(sinceNs uint64) (offset Offset, isLast bool, err error) {
-	indexFile, openErr := os.OpenFile(v.FileName()+".idx", os.O_RDONLY, 0644)
-	if openErr != nil {
-		err = fmt.Errorf("cannot read %s.idx: %v", v.FileName(), openErr)
-		return
-	}
-	defer indexFile.Close()
 
-	fi, statErr := indexFile.Stat()
-	if statErr != nil {
-		err = fmt.Errorf("file %s stat error: %v", indexFile.Name(), statErr)
-		return
-	}
-	fileSize := fi.Size()
+	fileSize := int64(v.IndexFileSize())
 	if fileSize%NeedleMapEntrySize != 0 {
-		err = fmt.Errorf("unexpected file %s size: %d", indexFile.Name(), fileSize)
+		err = fmt.Errorf("unexpected file %s.idx size: %d", v.IndexFileName(), fileSize)
 		return
 	}
 
-	bytes := make([]byte, NeedleMapEntrySize)
 	entryCount := fileSize / NeedleMapEntrySize
 	l := int64(0)
 	h := entryCount
@@ -200,7 +188,7 @@ func (v *Volume) BinarySearchByAppendAtNs(sinceNs uint64) (offset Offset, isLast
 		}
 
 		// read the appendAtNs for entry m
-		offset, err = v.readAppendAtNsForIndexEntry(indexFile, bytes, m)
+		offset, err = v.readOffsetFromIndex(m)
 		if err != nil {
 			return
 		}
@@ -224,19 +212,21 @@ func (v *Volume) BinarySearchByAppendAtNs(sinceNs uint64) (offset Offset, isLast
 		return Offset{}, true, nil
 	}
 
-	offset, err = v.readAppendAtNsForIndexEntry(indexFile, bytes, l)
+	offset, err = v.readOffsetFromIndex(l)
 
 	return offset, false, err
 
 }
 
 // bytes is of size NeedleMapEntrySize
-func (v *Volume) readAppendAtNsForIndexEntry(indexFile *os.File, bytes []byte, m int64) (Offset, error) {
-	if _, readErr := indexFile.ReadAt(bytes, m*NeedleMapEntrySize); readErr != nil && readErr != io.EOF {
-		return Offset{}, readErr
+func (v *Volume) readOffsetFromIndex(m int64) (Offset, error) {
+	v.dataFileAccessLock.RLock()
+	defer v.dataFileAccessLock.RUnlock()
+	if v.nm == nil {
+		return Offset{}, io.EOF
 	}
-	_, offset, _ := idx.IdxFileEntry(bytes)
-	return offset, nil
+	_, offset, _, err := v.nm.ReadIndexEntry(m)
+	return offset, err
 }
 
 // generate the volume idx
diff --git a/weed/storage/volume_loading.go b/weed/storage/volume_loading.go
index 05684cbdb..fe4980e31 100644
--- a/weed/storage/volume_loading.go
+++ b/weed/storage/volume_loading.go
@@ -23,7 +23,6 @@ func loadVolumeWithoutIndex(dirname string, collection string, id needle.VolumeI
 }
 
 func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType, preallocate int64) (err error) {
-	fileName := v.FileName()
 	alreadyHasSuperBlock := false
 
 	hasVolumeInfoFile := v.maybeLoadVolumeInfo() && v.volumeInfo.Version != 0
@@ -34,17 +33,17 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		glog.V(0).Infof("loading volume %d from remote %v", v.Id, v.volumeInfo.Files)
 		v.LoadRemoteFile()
 		alreadyHasSuperBlock = true
-	} else if exists, canRead, canWrite, modifiedTime, fileSize := util.CheckFile(fileName + ".dat"); exists {
+	} else if exists, canRead, canWrite, modifiedTime, fileSize := util.CheckFile(v.FileName(".dat")); exists {
 		// open dat file
 		if !canRead {
-			return fmt.Errorf("cannot read Volume Data file %s.dat", fileName)
+			return fmt.Errorf("cannot read Volume Data file %s", v.FileName(".dat"))
 		}
 		var dataFile *os.File
 		if canWrite {
-			dataFile, err = os.OpenFile(fileName+".dat", os.O_RDWR|os.O_CREATE, 0644)
+			dataFile, err = os.OpenFile(v.FileName(".dat"), os.O_RDWR|os.O_CREATE, 0644)
 		} else {
-			glog.V(0).Infoln("opening " + fileName + ".dat in READONLY mode")
-			dataFile, err = os.Open(fileName + ".dat")
+			glog.V(0).Infof("opening %s in READONLY mode", v.FileName(".dat"))
+			dataFile, err = os.Open(v.FileName(".dat"))
 			v.noWriteOrDelete = true
 		}
 		v.lastModifiedTsSeconds = uint64(modifiedTime.Unix())
@@ -54,17 +53,17 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		v.DataBackend = backend.NewDiskFile(dataFile)
 	} else {
 		if createDatIfMissing {
-			v.DataBackend, err = backend.CreateVolumeFile(fileName+".dat", preallocate, v.MemoryMapMaxSizeMb)
+			v.DataBackend, err = backend.CreateVolumeFile(v.FileName(".dat"), preallocate, v.MemoryMapMaxSizeMb)
 		} else {
-			return fmt.Errorf("Volume Data file %s.dat does not exist.", fileName)
+			return fmt.Errorf("volume data file %s does not exist", v.FileName(".dat"))
 		}
 	}
 
 	if err != nil {
 		if !os.IsPermission(err) {
-			return fmt.Errorf("cannot load Volume Data %s.dat: %v", fileName, err)
+			return fmt.Errorf("cannot load volume data %s: %v", v.FileName(".dat"), err)
 		} else {
-			return fmt.Errorf("load data file %s.dat: %v", fileName, err)
+			return fmt.Errorf("load data file %s: %v", v.FileName(".dat"), err)
 		}
 	}
 
@@ -72,21 +71,27 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		err = v.readSuperBlock()
 	} else {
 		if !v.SuperBlock.Initialized() {
-			return fmt.Errorf("volume %s.dat not initialized", fileName)
+			return fmt.Errorf("volume %s not initialized", v.FileName(".dat"))
 		}
 		err = v.maybeWriteSuperBlock()
 	}
 	if err == nil && alsoLoadIndex {
+		// adjust for existing volumes with .idx together with .dat files
+		if v.dirIdx != v.dir {
+			if util.FileExists(v.DataFileName()+".idx") {
+				v.dirIdx = v.dir
+			}
+		}
 		var indexFile *os.File
 		if v.noWriteOrDelete {
-			glog.V(0).Infoln("open to read file", fileName+".idx")
-			if indexFile, err = os.OpenFile(fileName+".idx", os.O_RDONLY, 0644); err != nil {
-				return fmt.Errorf("cannot read Volume Index %s.idx: %v", fileName, err)
+			glog.V(0).Infoln("open to read file", v.FileName(".idx"))
+			if indexFile, err = os.OpenFile(v.FileName(".idx"), os.O_RDONLY, 0644); err != nil {
+				return fmt.Errorf("cannot read Volume Index %s: %v",  v.FileName(".idx"), err)
 			}
 		} else {
-			glog.V(1).Infoln("open to write file", fileName+".idx")
-			if indexFile, err = os.OpenFile(fileName+".idx", os.O_RDWR|os.O_CREATE, 0644); err != nil {
-				return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, err)
+			glog.V(1).Infoln("open to write file", v.FileName(".idx"))
+			if indexFile, err = os.OpenFile(v.FileName(".idx"), os.O_RDWR|os.O_CREATE, 0644); err != nil {
+				return fmt.Errorf("cannot write Volume Index %s: %v",  v.FileName(".idx"), err)
 			}
 		}
 		if v.lastAppendAtNs, err = CheckAndFixVolumeDataIntegrity(v, indexFile); err != nil {
@@ -95,45 +100,45 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		}
 
 		if v.noWriteOrDelete || v.noWriteCanDelete {
-			if v.nm, err = NewSortedFileNeedleMap(fileName, indexFile); err != nil {
-				glog.V(0).Infof("loading sorted db %s error: %v", fileName+".sdx", err)
+			if v.nm, err = NewSortedFileNeedleMap(v.IndexFileName(), indexFile); err != nil {
+				glog.V(0).Infof("loading sorted db %s error: %v",  v.FileName(".sdx"), err)
 			}
 		} else {
 			switch needleMapKind {
 			case NeedleMapInMemory:
-				glog.V(0).Infoln("loading index", fileName+".idx", "to memory")
+				glog.V(0).Infoln("loading index", v.FileName(".idx"), "to memory")
 				if v.nm, err = LoadCompactNeedleMap(indexFile); err != nil {
-					glog.V(0).Infof("loading index %s to memory error: %v", fileName+".idx", err)
+					glog.V(0).Infof("loading index %s to memory error: %v", v.FileName(".idx"), err)
 				}
 			case NeedleMapLevelDb:
-				glog.V(0).Infoln("loading leveldb", fileName+".ldb")
+				glog.V(0).Infoln("loading leveldb", v.FileName(".ldb"))
 				opts := &opt.Options{
 					BlockCacheCapacity:            2 * 1024 * 1024, // default value is 8MiB
 					WriteBuffer:                   1 * 1024 * 1024, // default value is 4MiB
 					CompactionTableSizeMultiplier: 10,              // default value is 1
 				}
-				if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil {
-					glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err)
+				if v.nm, err = NewLevelDbNeedleMap(v.FileName(".ldb"), indexFile, opts); err != nil {
+					glog.V(0).Infof("loading leveldb %s error: %v", v.FileName(".ldb"), err)
 				}
 			case NeedleMapLevelDbMedium:
-				glog.V(0).Infoln("loading leveldb medium", fileName+".ldb")
+				glog.V(0).Infoln("loading leveldb medium", v.FileName(".ldb"))
 				opts := &opt.Options{
 					BlockCacheCapacity:            4 * 1024 * 1024, // default value is 8MiB
 					WriteBuffer:                   2 * 1024 * 1024, // default value is 4MiB
 					CompactionTableSizeMultiplier: 10,              // default value is 1
 				}
-				if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil {
-					glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err)
+				if v.nm, err = NewLevelDbNeedleMap(v.FileName(".ldb"), indexFile, opts); err != nil {
+					glog.V(0).Infof("loading leveldb %s error: %v", v.FileName(".ldb"), err)
 				}
 			case NeedleMapLevelDbLarge:
-				glog.V(0).Infoln("loading leveldb large", fileName+".ldb")
+				glog.V(0).Infoln("loading leveldb large", v.FileName(".ldb"))
 				opts := &opt.Options{
 					BlockCacheCapacity:            8 * 1024 * 1024, // default value is 8MiB
 					WriteBuffer:                   4 * 1024 * 1024, // default value is 4MiB
 					CompactionTableSizeMultiplier: 10,              // default value is 1
 				}
-				if v.nm, err = NewLevelDbNeedleMap(fileName+".ldb", indexFile, opts); err != nil {
-					glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", err)
+				if v.nm, err = NewLevelDbNeedleMap(v.FileName(".ldb"), indexFile, opts); err != nil {
+					glog.V(0).Infof("loading leveldb %s error: %v", v.FileName(".ldb"), err)
 				}
 			}
 		}
diff --git a/weed/storage/volume_read_write.go b/weed/storage/volume_read_write.go
index 869796a3f..c30abf237 100644
--- a/weed/storage/volume_read_write.go
+++ b/weed/storage/volume_read_write.go
@@ -19,6 +19,18 @@ var ErrorNotFound = errors.New("not found")
 var ErrorDeleted = errors.New("already deleted")
 var ErrorSizeMismatch = errors.New("size mismatch")
 
+func (v *Volume) checkReadWriteError(err error) {
+	if err == nil {
+		if v.lastIoError != nil {
+			v.lastIoError = nil
+		}
+		return
+	}
+	if err.Error() == "input/output error" {
+		v.lastIoError = err
+	}
+}
+
 // isFileUnchanged checks whether this needle to write is same as last one.
 // It requires serialized access in the same volume.
 func (v *Volume) isFileUnchanged(n *needle.Needle) bool {
@@ -56,18 +68,24 @@ func (v *Volume) Destroy() (err error) {
 		}
 	}
 	v.Close()
-	removeVolumeFiles(v.FileName())
+	removeVolumeFiles(v.DataFileName())
+	removeVolumeFiles(v.IndexFileName())
 	return
 }
 
 func removeVolumeFiles(filename string) {
+	// basic
 	os.Remove(filename + ".dat")
 	os.Remove(filename + ".idx")
 	os.Remove(filename + ".vif")
+	// sorted index file
 	os.Remove(filename + ".sdx")
+	// compaction
 	os.Remove(filename + ".cpd")
 	os.Remove(filename + ".cpx")
+	// level db indx file
 	os.RemoveAll(filename + ".ldb")
+	// marker for damaged or incomplete volume
 	os.Remove(filename + ".note")
 }
 
@@ -109,7 +127,9 @@ func (v *Volume) syncWrite(n *needle.Needle) (offset uint64, size Size, isUnchan
 
 	// append to dat file
 	n.AppendAtNs = uint64(time.Now().UnixNano())
-	if offset, size, _, err = n.Append(v.DataBackend, v.Version()); err != nil {
+	offset, size, _, err = n.Append(v.DataBackend, v.Version())
+	v.checkReadWriteError(err)
+	if err != nil {
 		return
 	}
 
@@ -173,7 +193,9 @@ func (v *Volume) doWriteRequest(n *needle.Needle) (offset uint64, size Size, isU
 
 	// append to dat file
 	n.AppendAtNs = uint64(time.Now().UnixNano())
-	if offset, size, _, err = n.Append(v.DataBackend, v.Version()); err != nil {
+	offset, size, _, err = n.Append(v.DataBackend, v.Version())
+	v.checkReadWriteError(err)
+	if err != nil {
 		return
 	}
 	v.lastAppendAtNs = n.AppendAtNs
@@ -208,6 +230,7 @@ func (v *Volume) syncDelete(n *needle.Needle) (Size, error) {
 		n.Data = nil
 		n.AppendAtNs = uint64(time.Now().UnixNano())
 		offset, _, _, err := n.Append(v.DataBackend, v.Version())
+		v.checkReadWriteError(err)
 		if err != nil {
 			return size, err
 		}
@@ -246,6 +269,7 @@ func (v *Volume) doDeleteRequest(n *needle.Needle) (Size, error) {
 		n.Data = nil
 		n.AppendAtNs = uint64(time.Now().UnixNano())
 		offset, _, _, err := n.Append(v.DataBackend, v.Version())
+		v.checkReadWriteError(err)
 		if err != nil {
 			return size, err
 		}
@@ -283,6 +307,7 @@ func (v *Volume) readNeedle(n *needle.Needle, readOption *ReadOption) (int, erro
 	if err == needle.ErrorSizeMismatch && OffsetSize == 4 {
 		err = n.ReadData(v.DataBackend, nv.Offset.ToAcutalOffset()+int64(MaxPossibleVolumeSize), readSize, v.Version())
 	}
+	v.checkReadWriteError(err)
 	if err != nil {
 		return 0, err
 	}
diff --git a/weed/storage/volume_tier.go b/weed/storage/volume_tier.go
index fd7b08654..77efd8a14 100644
--- a/weed/storage/volume_tier.go
+++ b/weed/storage/volume_tier.go
@@ -14,7 +14,7 @@ func (v *Volume) GetVolumeInfo() *volume_server_pb.VolumeInfo {
 
 func (v *Volume) maybeLoadVolumeInfo() (found bool) {
 
-	v.volumeInfo, v.hasRemoteFile, _ = pb.MaybeLoadVolumeInfo(v.FileName() + ".vif")
+	v.volumeInfo, v.hasRemoteFile, _ = pb.MaybeLoadVolumeInfo(v.FileName(".vif"))
 
 	if v.hasRemoteFile {
 		glog.V(0).Infof("volume %d is tiered to %s as %s and read only", v.Id,
@@ -43,7 +43,7 @@ func (v *Volume) LoadRemoteFile() error {
 
 func (v *Volume) SaveVolumeInfo() error {
 
-	tierFileName := v.FileName() + ".vif"
+	tierFileName := v.FileName(".vif")
 
 	return pb.SaveVolumeInfo(tierFileName, v.volumeInfo)
 
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index a3e5800df..f7b16b7db 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -49,7 +49,6 @@ func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error
 		v.isCompacting = false
 	}()
 
-	filePath := v.FileName()
 	v.lastCompactIndexOffset = v.IndexFileSize()
 	v.lastCompactRevision = v.SuperBlock.CompactionRevision
 	glog.V(3).Infof("creating copies for volume %d ,last offset %d...", v.Id, v.lastCompactIndexOffset)
@@ -59,7 +58,7 @@ func (v *Volume) Compact(preallocate int64, compactionBytePerSecond int64) error
 	if err := v.nm.Sync(); err != nil {
 		glog.V(0).Infof("compact fail to sync volume idx %d", v.Id)
 	}
-	return v.copyDataAndGenerateIndexFile(filePath+".cpd", filePath+".cpx", preallocate, compactionBytePerSecond)
+	return v.copyDataAndGenerateIndexFile(v.FileName(".cpd"), v.FileName(".cpx"), preallocate, compactionBytePerSecond)
 }
 
 // compact a volume based on deletions in .idx files
@@ -75,7 +74,6 @@ func (v *Volume) Compact2(preallocate int64, compactionBytePerSecond int64) erro
 		v.isCompacting = false
 	}()
 
-	filePath := v.FileName()
 	v.lastCompactIndexOffset = v.IndexFileSize()
 	v.lastCompactRevision = v.SuperBlock.CompactionRevision
 	glog.V(3).Infof("creating copies for volume %d ...", v.Id)
@@ -85,7 +83,7 @@ func (v *Volume) Compact2(preallocate int64, compactionBytePerSecond int64) erro
 	if err := v.nm.Sync(); err != nil {
 		glog.V(0).Infof("compact2 fail to sync volume idx %d: %v", v.Id, err)
 	}
-	return copyDataBasedOnIndexFile(filePath+".dat", filePath+".idx", filePath+".cpd", filePath+".cpx", v.SuperBlock, v.Version(), preallocate, compactionBytePerSecond)
+	return copyDataBasedOnIndexFile(v.FileName(".dat"), v.FileName(".idx"), v.FileName(".cpd"), v.FileName(".cpx"), v.SuperBlock, v.Version(), preallocate, compactionBytePerSecond)
 }
 
 func (v *Volume) CommitCompact() error {
@@ -113,40 +111,40 @@ func (v *Volume) CommitCompact() error {
 	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
 
 	var e error
-	if e = v.makeupDiff(v.FileName()+".cpd", v.FileName()+".cpx", v.FileName()+".dat", v.FileName()+".idx"); e != nil {
+	if e = v.makeupDiff(v.FileName(".cpd"), v.FileName(".cpx"), v.FileName(".dat"), v.FileName(".idx")); e != nil {
 		glog.V(0).Infof("makeupDiff in CommitCompact volume %d failed %v", v.Id, e)
-		e = os.Remove(v.FileName() + ".cpd")
+		e = os.Remove(v.FileName(".cpd"))
 		if e != nil {
 			return e
 		}
-		e = os.Remove(v.FileName() + ".cpx")
+		e = os.Remove(v.FileName(".cpx"))
 		if e != nil {
 			return e
 		}
 	} else {
 		if runtime.GOOS == "windows" {
-			e = os.RemoveAll(v.FileName() + ".dat")
+			e = os.RemoveAll(v.FileName(".dat"))
 			if e != nil {
 				return e
 			}
-			e = os.RemoveAll(v.FileName() + ".idx")
+			e = os.RemoveAll(v.FileName(".idx"))
 			if e != nil {
 				return e
 			}
 		}
 		var e error
-		if e = os.Rename(v.FileName()+".cpd", v.FileName()+".dat"); e != nil {
-			return fmt.Errorf("rename %s: %v", v.FileName()+".cpd", e)
+		if e = os.Rename(v.FileName(".cpd"), v.FileName(".dat")); e != nil {
+			return fmt.Errorf("rename %s: %v", v.FileName(".cpd"), e)
 		}
-		if e = os.Rename(v.FileName()+".cpx", v.FileName()+".idx"); e != nil {
-			return fmt.Errorf("rename %s: %v", v.FileName()+".cpx", e)
+		if e = os.Rename(v.FileName(".cpx"), v.FileName(".idx")); e != nil {
+			return fmt.Errorf("rename %s: %v", v.FileName(".cpx"), e)
 		}
 	}
 
 	//glog.V(3).Infof("Pretending to be vacuuming...")
 	//time.Sleep(20 * time.Second)
 
-	os.RemoveAll(v.FileName() + ".ldb")
+	os.RemoveAll(v.FileName(".ldb"))
 
 	glog.V(3).Infof("Loading volume %d commit file...", v.Id)
 	if e = v.load(true, false, v.needleMapKind, 0); e != nil {
@@ -158,8 +156,8 @@ func (v *Volume) CommitCompact() error {
 func (v *Volume) cleanupCompact() error {
 	glog.V(0).Infof("Cleaning up volume %d vacuuming...", v.Id)
 
-	e1 := os.Remove(v.FileName() + ".cpd")
-	e2 := os.Remove(v.FileName() + ".cpx")
+	e1 := os.Remove(v.FileName(".cpd"))
+	e2 := os.Remove(v.FileName(".cpx"))
 	if e1 != nil {
 		return e1
 	}
diff --git a/weed/storage/volume_vacuum_test.go b/weed/storage/volume_vacuum_test.go
index f96e9b0cf..cd5a4f430 100644
--- a/weed/storage/volume_vacuum_test.go
+++ b/weed/storage/volume_vacuum_test.go
@@ -69,7 +69,7 @@ func TestCompaction(t *testing.T) {
 	}
 	defer os.RemoveAll(dir) // clean up
 
-	v, err := NewVolume(dir, "", 1, NeedleMapInMemory, &super_block.ReplicaPlacement{}, &needle.TTL{}, 0, 0)
+	v, err := NewVolume(dir, dir, "", 1, NeedleMapInMemory, &super_block.ReplicaPlacement{}, &needle.TTL{}, 0, 0)
 	if err != nil {
 		t.Fatalf("volume creation: %v", err)
 	}
@@ -96,7 +96,7 @@ func TestCompaction(t *testing.T) {
 
 	v.Close()
 
-	v, err = NewVolume(dir, "", 1, NeedleMapInMemory, nil, nil, 0, 0)
+	v, err = NewVolume(dir, dir, "", 1, NeedleMapInMemory, nil, nil, 0, 0)
 	if err != nil {
 		t.Fatalf("volume reloading: %v", err)
 	}
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index e217617e9..bde72cf09 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -177,7 +177,9 @@ func (t *Topology) DeleteCollection(collectionName string) {
 }
 
 func (t *Topology) RegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
-	t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl).RegisterVolume(&v, dn)
+	vl := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl)
+	vl.RegisterVolume(&v, dn)
+	vl.EnsureCorrectWritables(&v)
 }
 func (t *Topology) UnRegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
 	glog.Infof("removing volume info:%+v", v)
diff --git a/weed/topology/topology_vacuum.go b/weed/topology/topology_vacuum.go
index 7bf55d131..04c26bc4d 100644
--- a/weed/topology/topology_vacuum.go
+++ b/weed/topology/topology_vacuum.go
@@ -144,12 +144,12 @@ func batchVacuumVolumeCleanup(grpcDialOption grpc.DialOption, vl *VolumeLayout,
 	}
 }
 
-func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, preallocate int64) int {
+func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, preallocate int64) {
 
 	// if there is vacuum going on, return immediately
 	swapped := atomic.CompareAndSwapInt64(&t.vacuumLockCounter, 0, 1)
 	if !swapped {
-		return 0
+		return
 	}
 	defer atomic.StoreInt64(&t.vacuumLockCounter, 0)
 
@@ -165,7 +165,6 @@ func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float
 			}
 		}
 	}
-	return 0
 }
 
 func vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, preallocate int64) {
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 4c9c84459..0db95d289 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -141,7 +141,6 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 	vl.accessLock.Lock()
 	defer vl.accessLock.Unlock()
 
-	defer vl.ensureCorrectWritables(v.Id)
 	defer vl.rememberOversizedVolume(v, dn)
 
 	if _, ok := vl.vid2location[v.Id]; !ok {
diff --git a/weed/util/compression.go b/weed/util/compression.go
index cf3ac7c57..9d52810cb 100644
--- a/weed/util/compression.go
+++ b/weed/util/compression.go
@@ -9,7 +9,7 @@ import (
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/klauspost/compress/zstd"
+	// "github.com/klauspost/compress/zstd"
 )
 
 var (
@@ -55,19 +55,15 @@ func GzipData(input []byte) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
-var zstdEncoder, _ = zstd.NewWriter(nil)
-
-func ZstdData(input []byte) ([]byte, error) {
-	return zstdEncoder.EncodeAll(input, nil), nil
-}
-
 func DecompressData(input []byte) ([]byte, error) {
 	if IsGzippedContent(input) {
 		return ungzipData(input)
 	}
-	if IsZstdContent(input) {
-		return unzstdData(input)
-	}
+	/*
+		if IsZstdContent(input) {
+			return unzstdData(input)
+		}
+	*/
 	return input, UnsupportedCompression
 }
 
@@ -82,12 +78,6 @@ func ungzipData(input []byte) ([]byte, error) {
 	return output, err
 }
 
-var decoder, _ = zstd.NewReader(nil)
-
-func unzstdData(input []byte) ([]byte, error) {
-	return decoder.DecodeAll(input, nil)
-}
-
 func IsGzippedContent(data []byte) bool {
 	if len(data) < 2 {
 		return false
@@ -95,12 +85,26 @@ func IsGzippedContent(data []byte) bool {
 	return data[0] == 31 && data[1] == 139
 }
 
+/*
+var zstdEncoder, _ = zstd.NewWriter(nil)
+
+func ZstdData(input []byte) ([]byte, error) {
+	return zstdEncoder.EncodeAll(input, nil), nil
+}
+
+var decoder, _ = zstd.NewReader(nil)
+
+func unzstdData(input []byte) ([]byte, error) {
+	return decoder.DecodeAll(input, nil)
+}
+
 func IsZstdContent(data []byte) bool {
 	if len(data) < 4 {
 		return false
 	}
 	return data[3] == 0xFD && data[2] == 0x2F && data[1] == 0xB5 && data[0] == 0x28
 }
+*/
 
 /*
 * Default not to compressed since compression can be done on client side.
diff --git a/weed/util/constants.go b/weed/util/constants.go
index 0aeee111e..254f3cb59 100644
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	VERSION = fmt.Sprintf("%s %d.%02d", sizeLimit, 2, 11)
+	VERSION = fmt.Sprintf("%s %d.%02d", sizeLimit, 2, 13)
 	COMMIT  = ""
 )
 
diff --git a/weed/util/http_util.go b/weed/util/http_util.go
index 7851d8293..2cd69b01b 100644
--- a/weed/util/http_util.go
+++ b/weed/util/http_util.go
@@ -374,3 +374,8 @@ func CloseResponse(resp *http.Response) {
 	io.Copy(ioutil.Discard, resp.Body)
 	resp.Body.Close()
 }
+
+func CloseRequest(req *http.Request) {
+	io.Copy(ioutil.Discard, req.Body)
+	req.Body.Close()
+}
diff --git a/weed/util/retry.go b/weed/util/retry.go
index 85c4d150d..7b0f2d3c3 100644
--- a/weed/util/retry.go
+++ b/weed/util/retry.go
@@ -22,9 +22,11 @@ func Retry(name string, job func() error) (err error) {
 		}
 		if strings.Contains(err.Error(), "transport") {
 			hasErr = true
-			glog.V(0).Infof("retry %s", name)
+			glog.V(0).Infof("retry %s: err: %v", name, err)
 			time.Sleep(waitTime)
 			waitTime += waitTime / 2
+		} else {
+			break
 		}
 	}
 	return err