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CONTAP-271480: Improve the resiliency of snapshot creation on SnapMirror Async leg in fan-out with SnapMirror active sync (SM-as)

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dp
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Issue

  • An ONTAP cluster is the source for a fanout snapmirror, with one common source and two separate snapmirror destinations.
  • The snapmirror source fans out to one asynchronous snapmirror destination, as well as another synchronous snapmirror destination.
  • SnapMirror configured in a SnapMirror Synchronous to SnapMirror Async fanout, or SnapMirror Active Sync (SM-as, formerly SMBC) SnapMirror Async fanout,  can see sporadic failures associated with "invalid base snapshot" errors.
  • The errors can resolve themselves on retry, but can also interrupt 3rd party application workflows prior to subsequent retries.

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