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Snapmirror Destination volume space usage is greater than Source volume

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Applies to

  • ONTAP 9
  • SnapMirror

Issue

  • When viewing space usage in a SnapMirror relationship with SnapMirror policy MirrorAllSnapshots, destination volume shows higher disk usage than source volume.
  • SnapMirror transfer is using "Logical Transfer"(LRE) to transfer.
    • To check if the Snapmirror is using "Logical Transfer with Storage Efficiency" or "Logical Transfer" (LRE) to transfer, access the SnapMirror Audit logs located in /etc/log/snapmirror_audit on the controller node which hosts the SnapMirror destination volume.
    • At the end of a successful transfer, these logs will indicate either "Logical Transfer with Storage Efficiency"  deduplication storage efficiency savings are maintained or "Logical Transfer" deduplication storage efficiency savings are lost.

Example:

Thu Jun 25 00:37:05 MST 2020 ScheduledUpdate[Jun 25 00:10:00]:1f3fcbe7-a165-11ea-88eb-00a098ef4a46 Operation-Uuid=e009b383-4121-4846-b6fc-27bf5143e57b Group=none Operation-Cookie=0 action=End source=svm_prod:vol1 destination=svm_dr:vol1_dr status=Success bytes_transferred=32360154734 network_compression_ratio=1.0:1 transfer_desc=Logical Transfer - Optimized Directory Mode

 

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