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SnapMirror scheduled update delays due to concurrent snapshot creation

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Applies to

  • ONTAP 9
  • AFF-A700
  • SnapMirror Scheduled Updates
  • Multiple volumes using frequent SnapMirror schedules
  • Recovery Point Objective(RPO)

Issue

  • During a DR simulation, it was observed that after a SnapMirror scheduled update at 22:30, database recovery on the destination included data up to 1 minute after the scheduled update time(e.g., data up to 22:31 was present)
  • This led to confusion about the actual RPO and the timing of data transfe
Example:
Fri Sep 12 22:30:00 2025 CreateSnapshotDest [Sep 12 22:30:00]: ... action=Start source=vs01:src_vol destination=vs01_dst:dst_vol
Fri Sep 12 22:31:09 2025 CreateSnapshotDest [Sep 12 22:30:00]: ... action=End source=vs01:src_vol destination=vs01_dst:dst_vol status=Success Note=Scheduled update operation is queued.
Fri Sep 12 22:31:09 2025 ScheduledUpdate [Sep 12 22:30:00]: ... action=Start source=vs01:src_vol destination=vs01_dst:dst_vol
Fri Sep 12 22:32:46 2025 ScheduledUpdate [Sep 12 22:30:00]: ... action=End source=vs01:src_vol destination=vs01_dst:dst_vol status=Success
  • The snapshot creation CreateSnapshotDest started at 22:30:00 and completed at 22:31:09
  • The SnapMirror update started immediately after snapshot creation finished

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