diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 6c293fe95..f24cea619 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -6,7 +6,6 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/topology"
 	"google.golang.org/grpc/peer"
 )
@@ -50,21 +49,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 				}
 			}
 
-			var volumeInfos []storage.VolumeInfo
-			for _, v := range heartbeat.Volumes {
-				if vi, err := storage.NewVolumeInfo(v); err == nil {
-					volumeInfos = append(volumeInfos, vi)
-				} else {
-					glog.V(0).Infof("Fail to convert joined volume information: %v", err)
-				}
-			}
-			deletedVolumes := dn.UpdateVolumes(volumeInfos)
-			for _, v := range volumeInfos {
-				t.RegisterVolumeLayout(v, dn)
-			}
-			for _, v := range deletedVolumes {
-				t.UnRegisterVolumeLayout(v, dn)
-			}
+			t.SyncDataNodeRegistration(heartbeat.Volumes, dn)
 
 		} else {
 			return err
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 27d22ee7e..cee156dc1 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -9,6 +9,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/sequence"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 )
 
 type Topology struct {
@@ -145,3 +146,21 @@ func (t *Topology) GetOrCreateDataCenter(dcName string) *DataCenter {
 	t.LinkChildNode(dc)
 	return dc
 }
+
+func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformationMessage, dn *DataNode) {
+	var volumeInfos []storage.VolumeInfo
+	for _, v := range volumes {
+		if vi, err := storage.NewVolumeInfo(v); err == nil {
+			volumeInfos = append(volumeInfos, vi)
+		} else {
+			glog.V(0).Infof("Fail to convert joined volume information: %v", err)
+		}
+	}
+	deletedVolumes := dn.UpdateVolumes(volumeInfos)
+	for _, v := range volumeInfos {
+		t.RegisterVolumeLayout(v, dn)
+	}
+	for _, v := range deletedVolumes {
+		t.UnRegisterVolumeLayout(v, dn)
+	}
+}
diff --git a/weed/topology/topology_test.go b/weed/topology/topology_test.go
index 06f506c37..36aa07157 100644
--- a/weed/topology/topology_test.go
+++ b/weed/topology/topology_test.go
@@ -4,7 +4,6 @@ import (
 	"testing"
 	"github.com/chrislusf/seaweedfs/weed/sequence"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
 func TestRemoveDataCenter(t *testing.T) {
@@ -44,20 +43,8 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 			}
 			volumeMessages = append(volumeMessages, volumeMessage)
 		}
-		var volumeInfos []storage.VolumeInfo
-		for _, v := range volumeMessages {
-			if vi, err := storage.NewVolumeInfo(v); err == nil {
-				volumeInfos = append(volumeInfos, vi)
-			}
-		}
 
-		deletedVolumes := dn.UpdateVolumes(volumeInfos)
-		for _, v := range volumeInfos {
-			topo.RegisterVolumeLayout(v, dn)
-		}
-		for _, v := range deletedVolumes {
-			topo.UnRegisterVolumeLayout(v, dn)
-		}
+		topo.SyncDataNodeRegistration(volumeMessages, dn)
 
 		assert(t, "activeVolumeCount1", topo.activeVolumeCount, volumeCount)
 		assert(t, "volumeCount", topo.volumeCount, volumeCount)
@@ -81,20 +68,7 @@ func TestHandlingVolumeServerHeartbeat(t *testing.T) {
 			}
 			volumeMessages = append(volumeMessages, volumeMessage)
 		}
-		var volumeInfos []storage.VolumeInfo
-		for _, v := range volumeMessages {
-			if vi, err := storage.NewVolumeInfo(v); err == nil {
-				volumeInfos = append(volumeInfos, vi)
-			}
-		}
-
-		deletedVolumes := dn.UpdateVolumes(volumeInfos)
-		for _, v := range volumeInfos {
-			topo.RegisterVolumeLayout(v, dn)
-		}
-		for _, v := range deletedVolumes {
-			topo.UnRegisterVolumeLayout(v, dn)
-		}
+		topo.SyncDataNodeRegistration(volumeMessages, dn)
 
 		assert(t, "activeVolumeCount1", topo.activeVolumeCount, volumeCount)
 		assert(t, "volumeCount", topo.volumeCount, volumeCount)