diff --git a/weed-fs/src/pkg/topology/node.go b/weed-fs/src/pkg/topology/node.go
index 81bad7da5..c65e53217 100644
--- a/weed-fs/src/pkg/topology/node.go
+++ b/weed-fs/src/pkg/topology/node.go
@@ -165,7 +165,7 @@ func (n *NodeImpl) CollectDeadNodeAndFullVolumes(freshThreshHold int64, volumeSi
 			for _, v := range dn.volumes {
 				if uint64(v.Size) >= volumeSizeLimit {
 				    //fmt.Println("volume",v.Id,"size",v.Size,">",volumeSizeLimit)
-					n.GetTopology().chanFullVolumes <- &v
+					n.GetTopology().chanFullVolumes <- v
 				}
 			}
 		}
diff --git a/weed-fs/src/pkg/topology/topology.go b/weed-fs/src/pkg/topology/topology.go
index 52d13135f..adaa16691 100644
--- a/weed-fs/src/pkg/topology/topology.go
+++ b/weed-fs/src/pkg/topology/topology.go
@@ -23,7 +23,7 @@ type Topology struct {
 
 	chanDeadDataNodes      chan *DataNode
 	chanRecoveredDataNodes chan *DataNode
-	chanFullVolumes        chan *storage.VolumeInfo
+	chanFullVolumes        chan storage.VolumeInfo
 
 	configuration *Configuration
 }
@@ -42,7 +42,7 @@ func NewTopology(id string, confFile string, dirname string, sequenceFilename st
 
 	t.chanDeadDataNodes = make(chan *DataNode)
 	t.chanRecoveredDataNodes = make(chan *DataNode)
-	t.chanFullVolumes = make(chan *storage.VolumeInfo)
+	t.chanFullVolumes = make(chan storage.VolumeInfo)
 
 	t.loadConfiguration(confFile)
 
diff --git a/weed-fs/src/pkg/topology/topology_event_handling.go b/weed-fs/src/pkg/topology/topology_event_handling.go
index 9d7999f93..4ff1a0bcc 100644
--- a/weed-fs/src/pkg/topology/topology_event_handling.go
+++ b/weed-fs/src/pkg/topology/topology_event_handling.go
@@ -26,7 +26,6 @@ func (t *Topology) StartRefreshWritableVolumes(garbageThreshold string) {
 			select {
 			case v := <-t.chanFullVolumes:
 				t.SetVolumeCapacityFull(v)
-				fmt.Println("Volume", v, "is full!")
 			case dn := <-t.chanRecoveredDataNodes:
 				t.RegisterRecoveredDataNode(dn)
 				fmt.Println("DataNode", dn, "is back alive!")
@@ -37,12 +36,15 @@ func (t *Topology) StartRefreshWritableVolumes(garbageThreshold string) {
 		}
 	}()
 }
-func (t *Topology) SetVolumeCapacityFull(volumeInfo *storage.VolumeInfo) {
+func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
 	vl := t.GetVolumeLayout(volumeInfo.RepType)
-	vl.SetVolumeCapacityFull(volumeInfo.Id)
+	if !vl.SetVolumeCapacityFull(volumeInfo.Id) {
+		return false
+	}
 	for _, dn := range vl.vid2location[volumeInfo.Id].list {
 		dn.UpAdjustActiveVolumeCountDelta(-1)
 	}
+	return true
 }
 func (t *Topology) UnRegisterDataNode(dn *DataNode) {
 	for _, v := range dn.volumes {
diff --git a/weed-fs/src/pkg/topology/volume_layout.go b/weed-fs/src/pkg/topology/volume_layout.go
index 2dee803d4..535effde6 100644
--- a/weed-fs/src/pkg/topology/volume_layout.go
+++ b/weed-fs/src/pkg/topology/volume_layout.go
@@ -38,8 +38,8 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 	}
 }
 
-func (vl *VolumeLayout) Lookup(vid storage.VolumeId) (*[]*DataNode) {
-  return &vl.vid2location[vid].list
+func (vl *VolumeLayout) Lookup(vid storage.VolumeId) *[]*DataNode {
+	return &vl.vid2location[vid].list
 }
 
 func (vl *VolumeLayout) PickForWrite(count int) (*storage.VolumeId, int, *VolumeLocationList, error) {
@@ -63,6 +63,7 @@ func (vl *VolumeLayout) GetActiveVolumeCount() int {
 func (vl *VolumeLayout) removeFromWritable(vid storage.VolumeId) bool {
 	for i, v := range vl.writables {
 		if v == vid {
+			fmt.Println("Volume", vid, "becomes unwritable")
 			vl.writables = append(vl.writables[:i], vl.writables[i+1:]...)
 			return true
 		}
@@ -75,6 +76,7 @@ func (vl *VolumeLayout) setVolumeWritable(vid storage.VolumeId) bool {
 			return false
 		}
 	}
+	fmt.Println("Volume", vid, "becomes writable")
 	vl.writables = append(vl.writables, vid)
 	return true
 }
@@ -91,7 +93,6 @@ func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId)
 func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) bool {
 	if vl.vid2location[vid].Add(dn) {
 		if vl.vid2location[vid].Length() >= vl.repType.GetCopyCount() {
-			fmt.Println("Volume", vid, "becomes writable")
 			return vl.setVolumeWritable(vid)
 		}
 	}