diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 4048225f3..95fdc3fd1 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -42,8 +42,11 @@ func (ms *MasterServer) ProcessGrowRequest() {
 				return !found
 			})
 
+			option := req.Option
+			vl := ms.Topo.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl, option.DiskType)
+
 			// not atomic but it's okay
-			if !found && ms.shouldVolumeGrow(req.Option) {
+			if !found && vl.ShouldGrowVolumes(option) {
 				filter.Store(req, nil)
 				// we have lock called inside vg
 				go func() {
@@ -130,7 +133,9 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 		MemoryMapMaxSizeMb: req.MemoryMapMaxSizeMb,
 	}
 
-	if ms.shouldVolumeGrow(option) {
+	vl := ms.Topo.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl, option.DiskType)
+
+	if vl.ShouldGrowVolumes(option) {
 		if ms.Topo.AvailableSpaceFor(option) <= 0 {
 			return nil, fmt.Errorf("no free volumes left for " + option.String())
 		}
diff --git a/weed/server/master_server_handlers.go b/weed/server/master_server_handlers.go
index 36c4239fb..8187ca21f 100644
--- a/weed/server/master_server_handlers.go
+++ b/weed/server/master_server_handlers.go
@@ -113,7 +113,9 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	if ms.shouldVolumeGrow(option) {
+	vl := ms.Topo.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl, option.DiskType)
+
+	if vl.ShouldGrowVolumes(option) {
 		glog.V(0).Infof("dirAssign volume growth %v from %v", option.String(), r.RemoteAddr)
 		if ms.Topo.AvailableSpaceFor(option) <= 0 {
 			writeJsonQuiet(w, r, http.StatusNotFound, operation.AssignResult{Error: "No free volumes left for " + option.String()})
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index 549ea86dc..41a2b570b 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -132,13 +132,6 @@ func (ms *MasterServer) submitFromMasterServerHandler(w http.ResponseWriter, r *
 	}
 }
 
-func (ms *MasterServer) shouldVolumeGrow(option *topology.VolumeGrowOption) bool {
-	vl := ms.Topo.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl, option.DiskType)
-	active, high := vl.GetActiveVolumeCount(option)
-	//glog.V(0).Infof("active volume: %d, high usage volume: %d\n", active, high)
-	return active <= high
-}
-
 func (ms *MasterServer) getVolumeGrowOption(r *http.Request) (*topology.VolumeGrowOption, error) {
 	replicationString := r.FormValue("replication")
 	if replicationString == "" {
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index db05102fe..3e487fb2f 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -310,6 +310,12 @@ func (vl *VolumeLayout) PickForWrite(count uint64, option *VolumeGrowOption) (*n
 	return &vid, count, locationList, nil
 }
 
+func (vl *VolumeLayout) ShouldGrowVolumes(option *VolumeGrowOption) bool {
+	active, crowded := vl.GetActiveVolumeCount(option)
+	//glog.V(0).Infof("active volume: %d, high usage volume: %d\n", active, high)
+	return active <= crowded
+}
+
 func (vl *VolumeLayout) GetActiveVolumeCount(option *VolumeGrowOption) (active, crowded int) {
 	vl.accessLock.RLock()
 	defer vl.accessLock.RUnlock()