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Why is the snapshot size larger on the destination than on the source?

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Applies to

  • ONTAP 9
  • SnapMirror

Answer

  • Snapshots consume space when blocks in the Active File System (AFS) are changed or deleted.
  • Differences in snapshot sizes between the source (src) and destination (dest) volumes can occur due to the following reasons:
    • Different storage efficiency settings (compression, deduplication) on the volumes.
    • Differences in the state of the AFS(Active File System) between src and dest.

         Note: If both src and dest volumes do not use storage efficiency, the AFS sizes at the time of snapshot creation differ, can cause the size discrepancy.

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