diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index a2f3c7692..f89c9598f 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -97,6 +97,11 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.Se
 	v.SetDefault("master.volume_growth.copy_3", 3)
 	v.SetDefault("master.volume_growth.copy_other", 1)
 	v.SetDefault("master.volume_growth.threshold", 0.9)
+	topology.VolumeGrowStrategy.Copy1Count = v.GetInt("master.volume_growth.copy_1")
+	topology.VolumeGrowStrategy.Copy2Count = v.GetInt("master.volume_growth.copy_2")
+	topology.VolumeGrowStrategy.Copy3Count = v.GetInt("master.volume_growth.copy_3")
+	topology.VolumeGrowStrategy.CopyOtherCount = v.GetInt("master.volume_growth.copy_other")
+	topology.VolumeGrowStrategy.Threshold = v.GetFloat64("master.volume_growth.threshold")
 
 	var preallocateSize int64
 	if option.VolumePreallocate {
@@ -151,7 +156,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.Se
 	ms.Topo.StartRefreshWritableVolumes(
 		ms.grpcDialOption,
 		ms.option.GarbageThreshold,
-		v.GetFloat64("master.volume_growth.threshold"),
+		topology.VolumeGrowStrategy.Threshold,
 		ms.preallocateSize,
 	)
 
diff --git a/weed/topology/volume_growth.go b/weed/topology/volume_growth.go
index cf5690cec..9885fc2d1 100644
--- a/weed/topology/volume_growth.go
+++ b/weed/topology/volume_growth.go
@@ -15,7 +15,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle"
 	"github.com/seaweedfs/seaweedfs/weed/storage/super_block"
 	"github.com/seaweedfs/seaweedfs/weed/storage/types"
-	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
 /*
@@ -31,6 +30,24 @@ type VolumeGrowRequest struct {
 	Count  int
 }
 
+type volumeGrowthStrategy struct {
+	Copy1Count int
+	Copy2Count int
+	Copy3Count int
+	CopyOtherCount int
+	Threshold float64
+}
+
+var (
+	VolumeGrowStrategy = volumeGrowthStrategy{
+		Copy1Count: 7,
+		Copy2Count: 6,
+		Copy3Count: 3,
+		CopyOtherCount: 1,
+		Threshold: 0.9,
+	}
+)
+
 type VolumeGrowOption struct {
 	Collection         string                        `json:"collection,omitempty"`
 	ReplicaPlacement   *super_block.ReplicaPlacement `json:"replication,omitempty"`
@@ -52,11 +69,6 @@ func (o *VolumeGrowOption) String() string {
 	return string(blob)
 }
 
-func (o *VolumeGrowOption) Threshold() float64 {
-	v := util.GetViper()
-	return v.GetFloat64("master.volume_growth.threshold")
-}
-
 func NewDefaultVolumeGrowth() *VolumeGrowth {
 	return &VolumeGrowth{}
 }
@@ -64,16 +76,14 @@ func NewDefaultVolumeGrowth() *VolumeGrowth {
 // one replication type may need rp.GetCopyCount() actual volumes
 // given copyCount, how many logical volumes to create
 func (vg *VolumeGrowth) findVolumeCount(copyCount int) (count int) {
-	v := util.GetViper()
 	switch copyCount {
-	case 1:
-		count = v.GetInt("master.volume_growth.copy_1")
+	case 1: count = VolumeGrowStrategy.Copy1Count
 	case 2:
-		count = v.GetInt("master.volume_growth.copy_2")
+		count = VolumeGrowStrategy.Copy2Count
 	case 3:
-		count = v.GetInt("master.volume_growth.copy_3")
+		count = VolumeGrowStrategy.Copy3Count
 	default:
-		count = v.GetInt("master.volume_growth.copy_other")
+		count = VolumeGrowStrategy.CopyOtherCount
 	}
 	return
 }
diff --git a/weed/topology/volume_growth_test.go b/weed/topology/volume_growth_test.go
index 04c5e8aeb..1624ec32a 100644
--- a/weed/topology/volume_growth_test.go
+++ b/weed/topology/volume_growth_test.go
@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/storage/types"
-	"github.com/seaweedfs/seaweedfs/weed/util"
 	"testing"
 
 	"github.com/seaweedfs/seaweedfs/weed/sequence"
@@ -420,8 +419,7 @@ func TestPickForWrite(t *testing.T) {
 		Rack:       "",
 		DataNode:   "",
 	}
-	v := util.GetViper()
-	v.Set("master.volume_growth.threshold", 0.9)
+	VolumeGrowStrategy.Threshold = 0.9
 	for _, rpStr := range []string{"001", "010", "100"} {
 		rp, _ := super_block.NewReplicaPlacementFromString(rpStr)
 		vl := topo.GetVolumeLayout("test", rp, needle.EMPTY_TTL, types.HardDriveType)
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 2296a0f92..4467b2dc8 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -303,7 +303,7 @@ func (vl *VolumeLayout) PickForWrite(count uint64, option *VolumeGrowOption) (vi
 			// check whether picked file is close to full
 			dn := locationList.Head()
 			info, _ := dn.GetVolumesById(vid)
-			if float64(info.Size) > float64(vl.volumeSizeLimit)*option.Threshold() {
+			if float64(info.Size) > float64(vl.volumeSizeLimit)*VolumeGrowStrategy.Threshold {
 				shouldGrow = true
 			}
 			return vid, count, locationList.Copy(), shouldGrow, nil
@@ -334,7 +334,7 @@ func (vl *VolumeLayout) PickForWrite(count uint64, option *VolumeGrowOption) (vi
 			vid, locationList = writableVolumeId, volumeLocationList.Copy()
 			// check whether picked file is close to full
 			info, _ := dn.GetVolumesById(writableVolumeId)
-			if float64(info.Size) > float64(vl.volumeSizeLimit)*option.Threshold() {
+			if float64(info.Size) > float64(vl.volumeSizeLimit)*VolumeGrowStrategy.Threshold {
 				shouldGrow = true
 			}
 			counter = count
@@ -370,7 +370,6 @@ func (vl *VolumeLayout) GetActiveVolumeCount(option *VolumeGrowOption) (total, a
 		return len(vl.writables), len(vl.writables), len(vl.crowded)
 	}
 	total = len(vl.writables)
-	threshold := option.Threshold()
 	for _, v := range vl.writables {
 		for _, dn := range vl.vid2location[v].list {
 			if dn.GetDataCenter().Id() == NodeId(option.DataCenter) {
@@ -382,7 +381,7 @@ func (vl *VolumeLayout) GetActiveVolumeCount(option *VolumeGrowOption) (total, a
 				}
 				active++
 				info, _ := dn.GetVolumesById(v)
-				if float64(info.Size) > float64(vl.volumeSizeLimit)*threshold {
+				if float64(info.Size) > float64(vl.volumeSizeLimit)* VolumeGrowStrategy.Threshold{
 					crowded++
 				}
 			}