diff --git a/go/storage/volume_replicate.go b/go/storage/volume_replicate.go
index 2fc12fc9e..1ea6a8765 100644
--- a/go/storage/volume_replicate.go
+++ b/go/storage/volume_replicate.go
@@ -73,6 +73,14 @@ func (cr *CleanReader) Seek(offset int64, whence int) (int64, error) {
 	return cr.DataFile.Seek(offset, whence)
 }
 
+func (cr *CleanReader) Size() (int64, error) {
+	fi, e := cr.DataFile.Stat()
+	if e != nil {
+		return 0, e
+	}
+	return fi.Size(), nil
+}
+
 func (cdr *CleanReader) WriteTo(w io.Writer) (written int64, err error) {
 	off, e := cdr.DataFile.Seek(0, 1)
 	if e != nil {
@@ -84,9 +92,6 @@ func (cdr *CleanReader) WriteTo(w io.Writer) (written int64, err error) {
 	var nextDirty *DirtyData
 	if dirtyIndex < len(cdr.Dirtys) {
 		nextDirty = &cdr.Dirtys[dirtyIndex]
-		if nextDirty.Offset+int64(nextDirty.Size) < off {
-			nextDirty = nil
-		}
 	}
 	for {
 		if nextDirty != nil && off >= nextDirty.Offset && off < nextDirty.Offset+int64(nextDirty.Size) {
@@ -189,6 +194,7 @@ func (v *Volume) GetVolumeCleanReader() (cr *CleanReader, err error) {
 		dirtys = ScanDirtyData(indexData)
 	}
 	dataFile, e := os.Open(v.FileName())
+
 	if e != nil {
 		return nil, e
 	}
diff --git a/go/weed/weed_server/volume_server.go b/go/weed/weed_server/volume_server.go
index 8becdd0f1..b8472235e 100644
--- a/go/weed/weed_server/volume_server.go
+++ b/go/weed/weed_server/volume_server.go
@@ -57,6 +57,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	adminMux.HandleFunc("/admin/sync/status", vs.guard.WhiteList(vs.getVolumeSyncStatusHandler))
 	adminMux.HandleFunc("/admin/sync/index", vs.guard.WhiteList(vs.getVolumeIndexContentHandler))
 	adminMux.HandleFunc("/admin/sync/data", vs.guard.WhiteList(vs.getVolumeDataContentHandler))
+	adminMux.HandleFunc("/admin/sync/vol_data", vs.guard.WhiteList(vs.getVolumeCleanDataHandler))
 	adminMux.HandleFunc("/stats/counter", vs.guard.WhiteList(statsCounterHandler))
 	adminMux.HandleFunc("/stats/memory", vs.guard.WhiteList(statsMemoryHandler))
 	adminMux.HandleFunc("/stats/disk", vs.guard.WhiteList(vs.statsDiskHandler))
diff --git a/go/weed/weed_server/volume_server_handlers_replicate.go b/go/weed/weed_server/volume_server_handlers_replicate.go
new file mode 100644
index 000000000..c8b807ffb
--- /dev/null
+++ b/go/weed/weed_server/volume_server_handlers_replicate.go
@@ -0,0 +1,60 @@
+package weed_server
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+	"github.com/chrislusf/seaweedfs/go/glog"
+	"io"
+	"github.com/pierrec/lz4"
+)
+
+func (vs *VolumeServer) getVolumeCleanDataHandler(w http.ResponseWriter, r *http.Request) {
+	v, err := vs.getVolume("volume", r)
+	if v == nil {
+		http.Error(w, fmt.Sprintf("Not Found volume: %v", err), http.StatusBadRequest)
+		return
+	}
+	cr, e := v.GetVolumeCleanReader()
+	if e != nil {
+		http.Error(w, fmt.Sprintf("Get volume clean reader: %v", err), http.StatusInternalServerError)
+		return
+	}
+	totalSize, e := cr.Size()
+	if e != nil {
+		http.Error(w, fmt.Sprintf("Get volume size: %v", err), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Accept-Ranges", "bytes")
+	w.Header().Set("Content-Encoding", "lz4")
+	lz4w := lz4.NewWriter(w)
+	defer lz4w.Close()
+	rangeReq := r.Header.Get("Range")
+	if rangeReq == "" {
+		w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
+		if _, e = io.Copy(lz4w, cr); e != nil {
+			glog.V(4).Infoln("response write error:", e)
+		}
+		return
+	}
+	ranges, err := parseRange(rangeReq, totalSize)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable)
+		return
+	}
+	if len(ranges) != 1 {
+		http.Error(w, "Only support one range", http.StatusNotImplemented)
+		return
+	}
+	ra := ranges[0]
+	if _, e := cr.Seek(ra.start, 0); e != nil {
+		http.Error(w, fmt.Sprintf("Seek: %v", err), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Length", strconv.FormatInt(ra.length, 10))
+	w.Header().Set("Content-Range", ra.contentRange(totalSize))
+	w.WriteHeader(http.StatusPartialContent)
+	if _, e = io.CopyN(lz4w, cr, ra.length); e != nil {
+		glog.V(2).Infoln("response write error:", e)
+	}
+}