diff --git a/go/proto/system_message.proto b/go/proto/system_message.proto
index 548360b27..703b1f4a0 100644
--- a/go/proto/system_message.proto
+++ b/go/proto/system_message.proto
@@ -1,27 +1,46 @@
 package operation;
 
 message VolumeInformationMessage {
-  required uint32 id = 1;
-  required uint64 size = 2;
-  optional string collection = 3;
-  required uint64 file_count = 4;
-  required uint64 delete_count = 5;
-  required uint64 deleted_byte_count = 6;
-  optional bool read_only = 7;
-  required uint32 replica_placement = 8;
-  optional uint32 version = 9 [default=2];
-  optional uint32 ttl = 10;
+    required uint32 id = 1;
+    required uint64 size = 2;
+    optional string collection = 3;
+    required uint64 file_count = 4;
+    required uint64 delete_count = 5;
+    required uint64 deleted_byte_count = 6;
+    optional bool read_only = 7;
+    required uint32 replica_placement = 8;
+    optional uint32 version = 9 [default=2];
+    optional uint32 ttl = 10;
+}
+
+enum VolumeTask {
+    Vacuum = 0;
+    Replicate = 1;
+}
+
+enum VolumeTaskStatus {
+    Working = 0;
+    Completed = 1;
+    Failed = 2;
+}
+
+message BusyVolume {
+    required uint32 id = 1;
+    required VolumeTask task = 2;
+    required VolumeTaskStatus status = 3;
+    required int64 start_time = 4;
 }
 
 message JoinMessage {
-  optional bool   is_init = 1;
-  required string ip = 2;
-  required uint32 port = 3;
-  optional string public_url = 4;
-  required uint32 max_volume_count = 5;
-  required uint64 max_file_key = 6;
-  optional string data_center = 7;
-  optional string rack = 8;
-  repeated VolumeInformationMessage volumes = 9;
-  optional uint32 admin_port = 10;
+    optional bool   is_init = 1;
+    required string ip = 2;
+    required uint32 port = 3;
+    optional string public_url = 4;
+    required uint32 max_volume_count = 5;
+    required uint64 max_file_key = 6;
+    optional string data_center = 7;
+    optional string rack = 8;
+    repeated VolumeInformationMessage volumes = 9;
+    optional uint32 admin_port = 10;
+    repeated BusyVolume busy_volumes = 11;
 }