diff --git a/weed/stats/metrics.go b/weed/stats/metrics.go
index af4f26e4c..dda4d95e5 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", "disk"})
+		}, []string{"collection", "type"})
 
 	VolumeServerReadOnlyVolumeGauge = prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
@@ -299,6 +299,7 @@ func JoinHostPort(host string, port int) string {
 	return net.JoinHostPort(host, portStr)
 }
 
+
 func StartMetricsServer(ip string, port int) {
 	if port == 0 {
 		return
@@ -315,10 +316,11 @@ 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.DeletePartialMatch(prometheus.Labels{"collection": collection, "type": volume_type})
+		VolumeServerReadOnlyVolumeGauge.DeleteLabelValues(collection, volume_type)
 	}
-	VolumeServerVolumeCounter.DeletePartialMatch(prometheus.Labels{"collection": collection, "type": "volume"})
+	VolumeServerVolumeCounter.DeleteLabelValues(collection, "volume")
 }
diff --git a/weed/storage/erasure_coding/ec_shard.go b/weed/storage/erasure_coding/ec_shard.go
index 85694e63b..19ee17636 100644
--- a/weed/storage/erasure_coding/ec_shard.go
+++ b/weed/storage/erasure_coding/ec_shard.go
@@ -7,8 +7,6 @@ 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"
@@ -46,7 +44,7 @@ func NewEcVolumeShard(diskType types.DiskType, dirname string, collection string
 	}
 	v.ecdFileSize = ecdFi.Size()
 
-	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "ec_shards", string(v.DiskType)).Inc()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "ec_shards").Inc()
 
 	return
 }
@@ -90,7 +88,7 @@ func (shard *EcVolumeShard) Close() {
 
 func (shard *EcVolumeShard) Destroy() {
 	os.Remove(shard.FileName() + ToExt(int(shard.ShardId)))
-	stats.VolumeServerVolumeCounter.WithLabelValues(shard.Collection, "ec_shards", string(shard.DiskType)).Dec()
+	stats.VolumeServerVolumeCounter.WithLabelValues(shard.Collection, "ec_shards").Dec()
 }
 
 func (shard *EcVolumeShard) ReadAt(buf []byte, offset int64) (int, error) {
diff --git a/weed/storage/volume.go b/weed/storage/volume.go
index 8530bc2e7..232930b80 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", v.DiskType().ReadableString()).Dec()
+		stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
 	}
 }
 
diff --git a/weed/storage/volume_loading.go b/weed/storage/volume_loading.go
index e7018d52c..78dfa6901 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", v.DiskType().ReadableString()).Inc()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Inc()
 
 	if err == nil {
 		hasLoadedVolume = true
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 9e5993a82..0eaca5ff4 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", v.DiskType().ReadableString()).Dec()
+	stats.VolumeServerVolumeCounter.WithLabelValues(v.Collection, "volume").Dec()
 
 	var e error
 	if e = v.makeupDiff(v.FileName(".cpd"), v.FileName(".cpx"), v.FileName(".dat"), v.FileName(".idx")); e != nil {