diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index 3b5b36a21..538ddf9e1 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -19,7 +19,7 @@ service VolumeServer {
 
     rpc DeleteCollection (DeleteCollectionRequest) returns (DeleteCollectionResponse) {
     }
-    rpc AssignVolume (AssignVolumeRequest) returns (AssignVolumeResponse) {
+    rpc AllocateVolume (AllocateVolumeRequest) returns (AllocateVolumeResponse) {
     }
 
     rpc VolumeSyncStatus (VolumeSyncStatusRequest) returns (VolumeSyncStatusResponse) {
@@ -94,14 +94,14 @@ message DeleteCollectionRequest {
 message DeleteCollectionResponse {
 }
 
-message AssignVolumeRequest {
+message AllocateVolumeRequest {
     uint32 volume_id = 1;
     string collection = 2;
     int64 preallocate = 3;
     string replication = 4;
     string ttl = 5;
 }
-message AssignVolumeResponse {
+message AllocateVolumeResponse {
 }
 
 message VolumeSyncStatusRequest {
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 0f3b47ee0..829f141a0 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -23,8 +23,8 @@ It has these top-level messages:
 	VacuumVolumeCleanupResponse
 	DeleteCollectionRequest
 	DeleteCollectionResponse
-	AssignVolumeRequest
-	AssignVolumeResponse
+	AllocateVolumeRequest
+	AllocateVolumeResponse
 	VolumeSyncStatusRequest
 	VolumeSyncStatusResponse
 	VolumeFollowRequest
@@ -282,7 +282,7 @@ func (m *DeleteCollectionResponse) String() string            { return proto.Com
 func (*DeleteCollectionResponse) ProtoMessage()               {}
 func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
 
-type AssignVolumeRequest struct {
+type AllocateVolumeRequest struct {
 	VolumeId    uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
 	Preallocate int64  `protobuf:"varint,3,opt,name=preallocate" json:"preallocate,omitempty"`
@@ -290,53 +290,53 @@ type AssignVolumeRequest struct {
 	Ttl         string `protobuf:"bytes,5,opt,name=ttl" json:"ttl,omitempty"`
 }
 
-func (m *AssignVolumeRequest) Reset()                    { *m = AssignVolumeRequest{} }
-func (m *AssignVolumeRequest) String() string            { return proto.CompactTextString(m) }
-func (*AssignVolumeRequest) ProtoMessage()               {}
-func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+func (m *AllocateVolumeRequest) Reset()                    { *m = AllocateVolumeRequest{} }
+func (m *AllocateVolumeRequest) String() string            { return proto.CompactTextString(m) }
+func (*AllocateVolumeRequest) ProtoMessage()               {}
+func (*AllocateVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
 
-func (m *AssignVolumeRequest) GetVolumeId() uint32 {
+func (m *AllocateVolumeRequest) GetVolumeId() uint32 {
 	if m != nil {
 		return m.VolumeId
 	}
 	return 0
 }
 
-func (m *AssignVolumeRequest) GetCollection() string {
+func (m *AllocateVolumeRequest) GetCollection() string {
 	if m != nil {
 		return m.Collection
 	}
 	return ""
 }
 
-func (m *AssignVolumeRequest) GetPreallocate() int64 {
+func (m *AllocateVolumeRequest) GetPreallocate() int64 {
 	if m != nil {
 		return m.Preallocate
 	}
 	return 0
 }
 
-func (m *AssignVolumeRequest) GetReplication() string {
+func (m *AllocateVolumeRequest) GetReplication() string {
 	if m != nil {
 		return m.Replication
 	}
 	return ""
 }
 
-func (m *AssignVolumeRequest) GetTtl() string {
+func (m *AllocateVolumeRequest) GetTtl() string {
 	if m != nil {
 		return m.Ttl
 	}
 	return ""
 }
 
-type AssignVolumeResponse struct {
+type AllocateVolumeResponse struct {
 }
 
-func (m *AssignVolumeResponse) Reset()                    { *m = AssignVolumeResponse{} }
-func (m *AssignVolumeResponse) String() string            { return proto.CompactTextString(m) }
-func (*AssignVolumeResponse) ProtoMessage()               {}
-func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+func (m *AllocateVolumeResponse) Reset()                    { *m = AllocateVolumeResponse{} }
+func (m *AllocateVolumeResponse) String() string            { return proto.CompactTextString(m) }
+func (*AllocateVolumeResponse) ProtoMessage()               {}
+func (*AllocateVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
 
 type VolumeSyncStatusRequest struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -817,8 +817,8 @@ func init() {
 	proto.RegisterType((*VacuumVolumeCleanupResponse)(nil), "volume_server_pb.VacuumVolumeCleanupResponse")
 	proto.RegisterType((*DeleteCollectionRequest)(nil), "volume_server_pb.DeleteCollectionRequest")
 	proto.RegisterType((*DeleteCollectionResponse)(nil), "volume_server_pb.DeleteCollectionResponse")
-	proto.RegisterType((*AssignVolumeRequest)(nil), "volume_server_pb.AssignVolumeRequest")
-	proto.RegisterType((*AssignVolumeResponse)(nil), "volume_server_pb.AssignVolumeResponse")
+	proto.RegisterType((*AllocateVolumeRequest)(nil), "volume_server_pb.AllocateVolumeRequest")
+	proto.RegisterType((*AllocateVolumeResponse)(nil), "volume_server_pb.AllocateVolumeResponse")
 	proto.RegisterType((*VolumeSyncStatusRequest)(nil), "volume_server_pb.VolumeSyncStatusRequest")
 	proto.RegisterType((*VolumeSyncStatusResponse)(nil), "volume_server_pb.VolumeSyncStatusResponse")
 	proto.RegisterType((*VolumeFollowRequest)(nil), "volume_server_pb.VolumeFollowRequest")
@@ -857,7 +857,7 @@ type VolumeServerClient interface {
 	VacuumVolumeCommit(ctx context.Context, in *VacuumVolumeCommitRequest, opts ...grpc.CallOption) (*VacuumVolumeCommitResponse, error)
 	VacuumVolumeCleanup(ctx context.Context, in *VacuumVolumeCleanupRequest, opts ...grpc.CallOption) (*VacuumVolumeCleanupResponse, error)
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
-	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
+	AllocateVolume(ctx context.Context, in *AllocateVolumeRequest, opts ...grpc.CallOption) (*AllocateVolumeResponse, error)
 	VolumeSyncStatus(ctx context.Context, in *VolumeSyncStatusRequest, opts ...grpc.CallOption) (*VolumeSyncStatusResponse, error)
 	VolumeFollow(ctx context.Context, in *VolumeFollowRequest, opts ...grpc.CallOption) (VolumeServer_VolumeFollowClient, error)
 	VolumeMount(ctx context.Context, in *VolumeMountRequest, opts ...grpc.CallOption) (*VolumeMountResponse, error)
@@ -930,9 +930,9 @@ func (c *volumeServerClient) DeleteCollection(ctx context.Context, in *DeleteCol
 	return out, nil
 }
 
-func (c *volumeServerClient) AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error) {
-	out := new(AssignVolumeResponse)
-	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/AssignVolume", in, out, c.cc, opts...)
+func (c *volumeServerClient) AllocateVolume(ctx context.Context, in *AllocateVolumeRequest, opts ...grpc.CallOption) (*AllocateVolumeResponse, error) {
+	out := new(AllocateVolumeResponse)
+	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/AllocateVolume", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -1067,7 +1067,7 @@ type VolumeServerServer interface {
 	VacuumVolumeCommit(context.Context, *VacuumVolumeCommitRequest) (*VacuumVolumeCommitResponse, error)
 	VacuumVolumeCleanup(context.Context, *VacuumVolumeCleanupRequest) (*VacuumVolumeCleanupResponse, error)
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
-	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
+	AllocateVolume(context.Context, *AllocateVolumeRequest) (*AllocateVolumeResponse, error)
 	VolumeSyncStatus(context.Context, *VolumeSyncStatusRequest) (*VolumeSyncStatusResponse, error)
 	VolumeFollow(*VolumeFollowRequest, VolumeServer_VolumeFollowServer) error
 	VolumeMount(context.Context, *VolumeMountRequest) (*VolumeMountResponse, error)
@@ -1190,20 +1190,20 @@ func _VolumeServer_DeleteCollection_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _VolumeServer_AssignVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(AssignVolumeRequest)
+func _VolumeServer_AllocateVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AllocateVolumeRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(VolumeServerServer).AssignVolume(ctx, in)
+		return srv.(VolumeServerServer).AllocateVolume(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/volume_server_pb.VolumeServer/AssignVolume",
+		FullMethod: "/volume_server_pb.VolumeServer/AllocateVolume",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(VolumeServerServer).AssignVolume(ctx, req.(*AssignVolumeRequest))
+		return srv.(VolumeServerServer).AllocateVolume(ctx, req.(*AllocateVolumeRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -1387,8 +1387,8 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			Handler:    _VolumeServer_DeleteCollection_Handler,
 		},
 		{
-			MethodName: "AssignVolume",
-			Handler:    _VolumeServer_AssignVolume_Handler,
+			MethodName: "AllocateVolume",
+			Handler:    _VolumeServer_AllocateVolume_Handler,
 		},
 		{
 			MethodName: "VolumeSyncStatus",
@@ -1434,78 +1434,78 @@ func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
 	// 1169 bytes of a gzipped FileDescriptorProto
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 	0x00,
 }
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index c924b7a62..c32f8a086 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -24,9 +24,9 @@ func (vs *VolumeServer) DeleteCollection(ctx context.Context, req *volume_server
 
 }
 
-func (vs *VolumeServer) AssignVolume(ctx context.Context, req *volume_server_pb.AssignVolumeRequest) (*volume_server_pb.AssignVolumeResponse, error) {
+func (vs *VolumeServer) AllocateVolume(ctx context.Context, req *volume_server_pb.AllocateVolumeRequest) (*volume_server_pb.AllocateVolumeResponse, error) {
 
-	resp := &volume_server_pb.AssignVolumeResponse{}
+	resp := &volume_server_pb.AllocateVolumeResponse{}
 
 	err := vs.store.AddVolume(
 		storage.VolumeId(req.VolumeId),
diff --git a/weed/topology/allocate_volume.go b/weed/topology/allocate_volume.go
index 1360988b3..f08736f64 100644
--- a/weed/topology/allocate_volume.go
+++ b/weed/topology/allocate_volume.go
@@ -16,7 +16,7 @@ func AllocateVolume(dn *DataNode, grpcDialOption grpc.DialOption, vid storage.Vo
 
 	return operation.WithVolumeServerClient(dn.Url(), grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 
-		_, deleteErr := client.AssignVolume(context.Background(), &volume_server_pb.AssignVolumeRequest{
+		_, deleteErr := client.AllocateVolume(context.Background(), &volume_server_pb.AllocateVolumeRequest{
 			VolumeId:    uint32(vid),
 			Collection:  option.Collection,
 			Replication: option.ReplicaPlacement.String(),