anchor.diff:                    not lists:keymember(Key, 1, NewOrUpdatedParams)
             end, McdConfig),
   
  -    [{set, McdKey, NewOrUpdatedParams ++ StrippedMcdConfig}].
  +    PortServersKey = {node, node(), port_servers},
  +    {value, DefaultPortServers} = ns_config:search([DefaultConfig], PortServersKey),
  +
  +    [{set, McdKey, NewOrUpdatedParams ++ StrippedMcdConfig},
  +     {set, PortServersKey, DefaultPortServers}].
   
   upgrade_1_7_1_to_1_7_2_test() ->
       DefaultCfg = [{rest, [{port, 8091}]},
  
positive.code:                     {log_generations, log_generations},
                      {log_rotation_period, log_rotation_period},
                      {engines, new_engines},
                      {something, something}]}],
                   Result2).
  
  no_upgrade_on_2_0_test() ->
  
negative.code:                     {log_generations, log_generations},
                      {log_rotation_period, log_rotation_period},
                      {engines, new_engines},
                      {something, something}]},
                    {set, {node, node(), port_servers}, new_port_servers}],
                   Result),
      Cfg2 = [[{remote_clusters, foobar},
               {{node, node(), compaction_daemon}, compaction_daemon_existing},
  