CONTAP-431944：使用 AutoFailoverDuplex 策略时，SM-AS 保护的辅助 LUN 已降级

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问题描述

即使关系未标记为 OOS，辅助 LUN 也可能进入降级状态

从主集群看不到不同步
二级集群上的 EMS 日志记录如下：

[node_dst: scsit_lu_0: scsiblade.san.ssm.lu.degraded:alert]: LUN 819ea+WwyjM8 was marked as degraded due to a SnapMirror Active Synchronous relationship going out of sync.
[node_dst: scsit_lu_0: scsiblade.san.ssm.lu.online:notice]: LUN 819ea+WwyjM8 is back online.