anchor.diff:  put(Metric, Value, Time, Args, State = #state{db = DBs}) ->
       DBs1 = [{Mod, Mod:put(Metric, Value, Time, Args, DB)} ||
                  {Mod, DB} <- DBs],
  -    State#state{db = DBs1}.
  +    {ok, State#state{db = DBs1}}.
  
positive.code:             put(<<"cloud.zones.zfs.write.time">>, V, SnapTime,
                  [{<<"zone">>, Zone}], State);
          _ ->
              State
      end.
  
  parse_iface(<<"z", _, $_, IFace/binary>>) ->
  
negative.code:     tachyon_mps:provide(),
      case tachyon_kstat_pkg:decode(Msg) of
          {ok, {_, <<"global">>, _, _, _}} ->
              {ok, State};
          {ok, P} ->
              do_zone(P, State);
          E ->
              lager:error("[msg] ~p", [E]),
              {ok, State}
  