diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 0382c2dae..9f0adb4c9 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -209,8 +209,9 @@ func (ms *MasterServer) Statistics(ctx context.Context, req *master_pb.Statistic
 
 	volumeLayout := ms.Topo.GetVolumeLayout(req.Collection, replicaPlacement, ttl, types.ToDiskType(req.DiskType))
 	stats := volumeLayout.Stats()
+	totalSize := ms.Topo.GetDiskUsages().GetMaxVolumeCount() * int64(ms.option.VolumeSizeLimitMB)
 	resp := &master_pb.StatisticsResponse{
-		TotalSize: stats.TotalSize,
+		TotalSize: uint64(totalSize),
 		UsedSize:  stats.UsedSize,
 		FileCount: stats.FileCount,
 	}
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 167aee8ea..dee82762a 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -493,9 +493,9 @@ func (vl *VolumeLayout) Stats() *VolumeLayoutStats {
 	for vid, vll := range vl.vid2location {
 		size, fileCount := vll.Stats(vid, freshThreshold)
 		ret.FileCount += uint64(fileCount)
-		ret.UsedSize += size
+		ret.UsedSize += size * uint64(vll.Length())
 		if vl.readonlyVolumes.IsTrue(vid) {
-			ret.TotalSize += size
+			ret.TotalSize += size * uint64(vll.Length())
 		} else {
 			ret.TotalSize += vl.volumeSizeLimit * uint64(vll.Length())
 		}