anchor.diff:              end,
           ?assertMatch({_, {ok, _}}, MkAnsCheck),
           {Level2TmpDir, _} = MkAnsCheck,
  +        ct:print("Verify spawn1 ~p", [{Level2TmpDir}]),
           VerifyStats(Level2TmpDir, true),
           [Level2TmpDir | Acc]
       end, [], Workers),
  
positive.code:         NewAcc = <<Acc/binary, WriteBuf/binary>>,
  
          Verify(fun(W2) ->
              OpenAns2 = lfm_proxy:open(W2, SessId(W2), {path, Level2File}, rdwr),
              ?assertMatch({ok, _}, OpenAns2),
              {ok, Handle2} = OpenAns2,
  
negative.code: 
      lists:foreach(fun(W) ->
          Level2TmpDir = <<Dir/binary, "/", (generator:gen_name())/binary>>,
          ct:print("Verify dir ~p", [{Level2TmpDir, W}]),
          ?assertMatch({ok, _}, lfm_proxy:mkdir(W, SessId(W), Level2TmpDir, 8#755)),
          VerifyStats(Level2TmpDir, true),
  
          lists:foreach(fun(W2) ->
              Level3TmpDir = <<Level2TmpDir/binary, "/", (generator:gen_name())/binary>>,
              ct:print("Verify dir2 ~p", [{Level3TmpDir, W}]),
              ?assertMatch({ok, _}, lfm_proxy:mkdir(W2, SessId(W2), Level3TmpDir, 8#755)),
              VerifyStats(Level3TmpDir, true)
          end, Workers)
  