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SnapMirror destination volume shows large size discrepancy from source

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Applies to

  • ONTAP 9
  • SnapMirror
  • Volume efficiency

Issue

SnapMirror destination volume may show much more space consumed even though transfer is using LRSE (note that Logical Used is the same, indicating the same amount of user-visible data in each volume):
 
Example:
 
Volume : source

      Feature                                           Used      Used%
      --------------------------------      ----------------      -----
      User Data                                       3.03TB        83%
      Filesystem Metadata                             2.98GB         0%
      Inodes                                          48.1GB         1%
      Snapshot Reserve                                 564GB        15%
      Deduplication                                   15.8GB         0%
      Quota Metafiles                                 20.0KB         0%
      Total                                           3.65TB       100%
      Total Physical Used                             3.20TB        87%
      Logical Used                                    20.1TB       549%

Volume : destination

      Feature                                           Used      Used%
      --------------------------------      ----------------      -----
      User Data                                       7.06TB        66%
      Filesystem Metadata                             1.70TB        16%
      Inodes                                          48.1GB         0%
      Snapshot Reserve                                1.60TB        15%
      Total                                           10.4TB        97%
      Total Physical Used                             8.81TB        82%
      Logical Used                                    20.1TB       188%

 

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