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Missing Snapshots on middle cluster of cascade

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snapmirror
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Applies to

  • ONTAP 9.7
  • Snapmirror Cascade
  • SVM DR
  • SnapMirror is modified to MirrorAllSnapshots post initialization

Issue

Customer original environment was a production cluster to DR cluster.  They used a surrogate cluster on source acting as a tertiary (A->C) of a cascade.  Customer relocated the tertiary (A->C) to the DR site and attempted to reestablish replication (C->B).  This failed with the not common snapshot error.  The common snapshots were on the (A->C) cluster but the snapmirror transfer with mirrorallsnapshot did not transfer the common snapshot or daily snaps.

 

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