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Does ONTAP apply efficiency to blocks that only exist in Snapshots?

Last Updated:

Applies to

  • ONTAP 9
  • Active Filesystem (AFS)
  • Snapshot
  • Efficiency
  • Deduplication
  • Compression
  • Compaction


No, ONTAP does only apply efficiencies to blocks that exist in active filesystem (AFS).

Additional Information

  1. File or Block was written to a volume
  2. Inline efficiency was NOT applied
    • FAS with no inline configured
    • AFF under high write workload
  3. Block is tracked in volume efficiency change-log, to be picked up by next efficiency background job
  4. Background efficiency job schedule did NOT yet trigger
  5. Snapshot snap1 is created
  6. File or Block written in 1 is deleted from AFS and so remains trapped in a Snapshot snap1 only
  7. Background efficiency schedule triggers
  8. File or Block written in 1 remains in WAFL (snap1) without efficiencies applied until Snapshot snap1 is deleted
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