anchor.diff:  
       ok = leo_redundant_manager_api:start(ServerType),
       leo_redundant_manager_api:set_options([{n, 3},
  -                                            {r, 1},
  -                                            {w ,2},
  -                                            {d, 2},
  -                                            {bit_of_ring, 128}]),
  +                                           {r, 1},
  +                                           {w ,2},
  +                                           {d, 2},
  +                                           {bit_of_ring, 128}]),
       leo_redundant_manager_api:attach(list_to_atom("node_0@" ++ Hostname)),
       leo_redundant_manager_api:attach(list_to_atom("node_1@" ++ Hostname)),
       leo_redundant_manager_api:attach(list_to_atom("node_2@" ++ Hostname)),
  
positive.code:                                                               end, Nodes0a)
                                          end, Nodes0),
                            ?assertEqual(3, length(Nodes0))
                    end, lists:seq(0, 1000)),
  
      {ok, #redundancies{id       = Id,
                         vnode_id = VNodeId1,
  
negative.code:                                                               end, Nodes0a)
                                          end, Nodes0),
                            ?assertEqual(3, length(Nodes0))
                    end, lists:seq(0, 300)),
      lists:foreach(fun(_) ->
                            Id = random:uniform(Max),
                            {ok, #redundancies{id       = _Id0,
  