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SnapMirror Sync randomly goes out of sync
https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/SnapMirror_Sync_randomly_goes_out_of_sync
Applies to ONTAP 9 SnapMirror Sync Issue SnapMirror Sync status goes out of sync at random times with no apparent reason

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