diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index afb14b6e4..066f5f69a 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -43,6 +43,7 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 	if _, ok := vl.vid2location[v.Id]; !ok {
 		vl.vid2location[v.Id] = NewVolumeLocationList()
 	}
+	vl.vid2location[v.Id].Set(dn)
 	glog.V(4).Infoln("volume", v.Id, "added to dn", dn.Id(), "len", vl.vid2location[v.Id].Length(), "copy", v.ReplicaPlacement.GetCopyCount())
 	if vl.vid2location[v.Id].Length() == vl.rp.GetCopyCount() && vl.isWritable(v) {
 		if _, ok := vl.oversizedVolumes[v.Id]; !ok {