muc mangement

When you say group, I guess you want to say MUC room.

Each room lives only in one node of the cluster: in the node where the user that created it is connected. That room is visible and can be joined from the other nodes, but lives only where it was created.

From what I know, it isn't possible to move a room to another node.

There is no easy way to get that information. If you apply this patch, you can see it in the WebAdmin:

diff --git a/src/mod_muc_admin.erl b/src/mod_muc_admin.erl
index a8dbc24..62531ed 100644
--- a/src/mod_muc_admin.erl
+++ b/src/mod_muc_admin.erl
@@ -422,7 +422,8 @@ make_rooms_page(Host, Lang, {Sort_direction, Sort_column}) ->
 	      <<"Persistent">>,
 	      <<"Logging">>,
 	      <<"Just created">>,
-	      <<"Room title">>],
+	      <<"Room title">>,
+	      <<"Node">>],
     {Titles_TR, _} =
 	lists:mapfoldl(
 	  fun(Title, Num_column) ->
@@ -467,6 +468,7 @@ build_info_room({Name, Host, Pid}) ->
     S = get_room_state(Pid),
     Just_created = S#state.just_created,
     Num_participants = length(dict:fetch_keys(S#state.users)),
+    Node = node(Pid),
 
     History = (S#state.history)#lqueue.queue,
     Ts_last_message =
@@ -486,7 +488,8 @@ build_info_room({Name, Host, Pid}) ->
      Persistent,
      Logging,
      Just_created,
-     Title}.
+     Title,
+     Node}.
 
 get_queue_last(Queue) ->
     List = p1_queue:to_list(Queue),
@@ -502,7 +505,8 @@ prepare_room_info(Room_info) ->
      Persistent,
      Logging,
      Just_created,
-     Title} = Room_info,
+     Title,
+     Node} = Room_info,
     [NameHost,
      integer_to_binary(Num_participants),
      Ts_last_message,
@@ -510,7 +514,8 @@ prepare_room_info(Room_info) ->
      misc:atom_to_binary(Persistent),
      misc:atom_to_binary(Logging),
      misc:atom_to_binary(Just_created),
-     Title].
+     Title,
+     misc:atom_to_binary(Node)].
 
 
 %%----------------------------