【Primera】remote copy group停止后无法启动

两套4.2.2 版本primera做双活，

primera升级到4.2版本后，remote copy group stop，尝试使用startrcopygroup 启动RCG后，RCG会start，但是很快停止并出现告警 IO time out。

hpepri01dp cli% showtask -d 29697
   Id Type             Name          Status Phase Step -------StartTime------- ------FinishTime------- -Priority- -User-
29697 remote_copy_sync SFARM_TEST_11 failed   ---  --- 2021-01-29 22:09:46 CET 2021-01-29 22:10:33 CET n/a        n/a

Detailed status:
2021-01-29 22:09:46 CET Created     task.
2021-01-29 22:09:46 CET Startup     adding resync of volume SFARM_TEST_11 in group RC_SFARM_TEST_11 to target hpepri01ds to the synchronization list.
2021-01-29 22:09:46 CET Started     resync of volume SFARM_TEST_11  (offset 0MB length 4194304MB) in group RC_SFARM_TEST_11 to target hpepri01ds has started. (sync_vol: none  resync_vol: rcpy.178.3277.1/22337.)
2021-01-29 22:10:33 CET Stopped     This synchronization was stopped by the sysmgr.
2021-01-29 22:10:33 CET Failed      sync of volume SFARM_TEST_11(rcpy.178.3277.1) in RC_SFARM_TEST_11 group to target hpepri01ds failed, volume has status STALE.

这是一个Remote copy通信的问题，主存储和备存储之间的通信句柄出现异常，没有正常消失导致startrcopygroup失败。

三种方法：

① controlport offline
      controlport rst

②  RCFC cable reseat of all cables; causing a Plogi to reestablish RC Peer communication 

③  down/up all the RCFC port at the switch