Understanding SnapMirror storage efficiency
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