diff --git a/weed/stats/metrics.go b/weed/stats/metrics.go
index 3dda42423..af4f26e4c 100644
--- a/weed/stats/metrics.go
+++ b/weed/stats/metrics.go
@@ -176,7 +176,7 @@ var (
 			Subsystem: "volumeServer",
 			Name:      "volumes",
 			Help:      "Number of volumes or shards.",
-		}, []string{"collection", "type"})
+		}, []string{"collection", "type", "disk"})
 
 	VolumeServerReadOnlyVolumeGauge = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
@@ -315,11 +315,10 @@ func SourceName(port uint32) string {
 	return net.JoinHostPort(hostname, strconv.Itoa(int(port)))
 }
 
-// todo - can be changed to DeletePartialMatch when https://github.com/prometheus/client_golang/pull/1013 gets released
 func DeleteCollectionMetrics(collection string) {
 	VolumeServerDiskSizeGauge.DeleteLabelValues(collection, "normal")
 	for _, volume_type := range readOnlyVolumeTypes {
-		VolumeServerReadOnlyVolumeGauge.DeleteLabelValues(collection, volume_type)
+		VolumeServerReadOnlyVolumeGauge.DeletePartialMatch(prometheus.Labels{"collection": collection, "type": volume_type})
 	}
-	VolumeServerVolumeCounter.DeleteLabelValues(collection, "volume")
+	VolumeServerVolumeCounter.DeletePartialMatch(prometheus.Labels{"collection": collection, "type": "volume"})
 }
diff --git a/weed/storage/erasure_coding/ec_shard.go b/weed/storage/erasure_coding/ec_shard.go
index 19ee17636..85694e63b 100644
--- a/weed/storage/erasure_coding/ec_shard.go
+++ b/weed/storage/erasure_coding/ec_shard.go
@@ -7,6 +7,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/seaweedfs/seaweedfs/weed/storage/types"
+
 	"github.com/seaweedfs/seaweedfs/weed/stats"
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle"
 	"github.com/seaweedfs/seaweedfs/weed/storage/types"
@@ -44,7 +46,7 @@ func NewEcVolumeShard(diskType types.DiskType, dirname string, collection string
 	}
 	v.ecdFileSize = ecdFi.Size()
 
-	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "ec_shards").Inc()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "ec_shards", string(v.DiskType)).Inc()
 
 	return
 }
@@ -88,7 +90,7 @@ func (shard *EcVolumeShard) Close() {
 
 func (shard *EcVolumeShard) Destroy() {
 	os.Remove(shard.FileName() + ToExt(int(shard.ShardId)))
-	stats.VolumeServerVolumeCounter.WithLabelValues(shard.Collection, "ec_shards").Dec()
+	stats.VolumeServerVolumeCounter.WithLabelValues(shard.Collection, "ec_shards", string(shard.DiskType)).Dec()
 }
 
 func (shard *EcVolumeShard) ReadAt(buf []byte, offset int64) (int, error) {
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index 232930b80..8530bc2e7 100644
--- a/weed/storage/volume.go
+++ b/weed/storage/volume.go
@@ -246,7 +246,7 @@ func (v *Volume) doClose() {
 			glog.Warningf("Volume Close fail to sync volume %d", v.Id)
 		}
 		v.DataBackend = nil
-		stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
+		stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume", v.DiskType().ReadableString()).Dec()
 	}
 }
 
diff --git a/weed/storage/volume_loading.go b/weed/storage/volume_loading.go
index 78dfa6901..e7018d52c 100644
--- a/weed/storage/volume_loading.go
+++ b/weed/storage/volume_loading.go
@@ -201,7 +201,7 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		}
 	}
 
-	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Inc()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume", v.DiskType().ReadableString()).Inc()
 
 	if err == nil {
 		hasLoadedVolume = true
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 0eaca5ff4..9e5993a82 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -124,7 +124,7 @@ func (v *Volume) CommitCompact() error {
 		}
 	}
 	v.DataBackend = nil
-	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume", v.DiskType().ReadableString()).Dec()
 
 	var e error
 	if e = v.makeupDiff(v.FileName(".cpd"), v.FileName(".cpx"), v.FileName(".dat"), v.FileName(".idx")); e != nil {