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Understanding SnapMirror storage efficiency

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Applies to

  • ONTAP 9
  • SnapMirror
  • Storage Efficiency

Answer

  • SnapMirror preserves the storage efficiency (deduplication, compression, compaction, etc.) from the source unless additional forms of compression are applied to the destination, with the exception of Temperature Sensitive Storage Efficiency
  • The below table represents storage efficiency combinations on source and destination volumes and the transfer result
    • Deduplication (D)  - Inline or background / post-process
    • Adaptive Compression (Ca) - Inline or postprocess
    • Secondary Compression (Cs) - Inline or postprocess
    • Temperature Sensitive Storage Efficiency (TSSE) - ONTAP 9.8 and later on AFF platforms
Source Destination Result
D or No storage efficiency D or No additional storage efficiency All source deduplication savings are maintained and additional deduplication scanners run against transferred Snapshots on the destination when the transfer completes (if configured)
D, Ca or Cs D or No additional storage efficiency All source deduplication and compression savings are maintained and additional deduplication scanners run against transferred Snapshots on the destination when the transfer completes (if configured)
TSSE TSSE All source deduplication and compression savings are maintained with some exceptions. See How does Temperature Sensitive Storage Efficiency affect SnapMirror?
D, Ca or Cs D, Ca or Cs All source deduplication savings are lost while compression is maintained. Additional deduplication and compression scanners run against transferred Snapshots on the destination when the transfer completes.
Any combination of storage efficiency Any storage efficiency including Ca or Cs All source deduplication savings are lost while compression is maintained. Additional deduplication and compression scanners run against transferred Snapshots on the destination when the transfer completes.

Additional Information

 

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