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ONTAP Select - Broken disk causes SyncMirror Plex failure
https://kb.netapp.com/on-prem/ontap/ontap-select/Select-KBs/ONTAP_Select_-_Broken_disk_causes_SyncMirror_Plex_failure
Applies to ONTAP Select (OTS) VMware ESXi Issue SYNCMIRROR PLEX FAILED indicates that a plex of a SyncMirror has failed and the SyncMirror relationship is in a degraded state.

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