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How do platforms supporting QAT or zlib compression impact SnapMirror and volume move?

  1. Last updated
    May 22, 2025
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Applies to

  • AFF and ASA A-Series platforms supporting QuickAssist Technology (QAT) and zlib compression
  • A1K, A90, A70, A50, A30, A20
  • SnapMirror
  • Volume move (vol move)

Answer

Source Destination SnapMirror behavior Volume move behavior
  • QAT (zlib) platform
  • ONTAP 9.15.1 or later
  • QAT (zlib) platform
  • ONTAP 9.15.1 or later

All data compression savings are maintained

All data compression savings are maintained
  • QAT (zlib) platform
  • ONTAP 9.15.1 or later
  • Non-QAT platform
  • ONTAP 9.15.1 or later

zlib compression savings are reformatted to destination platform native compression savings (TSSE supported)

zlib compression savings are reformatted to the destination platform native compression savings
  • QAT (zlib) platform
  • ONTAP 9.15.1 or later
  • Non-QAT platform
  • ONTAP 9.14.1 or earlier

zlib compression savings are reformatted to destination platform native compression savings

 N/A
  • Non-QAT platform
  • Any ONTAP version compatible with destination
  • QAT (zlib) platform
  • ONTAP 9.15.1 or later
 All compression savings are written as zlib compression savings All compression savings reformatted to zlib compression savings
  • Note: There is no need to explicitly enable compression on a SnapMirror destination. Doing so can result in SnapMirror not maintaining storage efficiency savings over the network
  • Check a volume's compression algorithm by using the command:
    ::> volume efficiency show -fields state,compression-algorithm

    Ensure that storage efficiency is enabled before concluding that any given compression algorithm is being used
Reformatting
  • Reformatting QAT (zlib) compressed data to a non-QAT platform's native compression incurs additional overhead. This may result in a marginal performance impact to replication for both SnapMirror and volume move
  • Due to the highly efficient QAT / zlib compression alogorithm, significant differences between source and destination volume sizes can result when replicating to or from a non-QAT platform

Additional Information

Parent topic: SnapMirror storage efficiency configurations and behavior

 

 

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