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CONTAP-584411: Achieving Sub-4K Data Redundancy Savings in NetApp ONTAP

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Issue

  • NetApp's ONTAP deduplication operates with a fixed 4KB chunk size, meaning that deduplication occurs on 4KB aligned boundaries.
  • This fixed chunk size simplifies the deduplication process and is effective for many common data patterns. However, when redundancies occur at a sub-4K granularity, ONTAP relies on its advanced compression algorithms to realize storage savings.
  • Compression in ONTAP is designed to handle smaller redundant data segments efficiently. If these sub-4K redundancies are spread within a 32K boundary, the compression feature can effectively capture and reduce the data size.
  • On the other hand, if the redundancies are more dispersed beyond this boundary, even compression may have limitations in optimizing the storage savings.
  • This combined approach of deduplication and compression ensures that ONTAP can effectively manage a wide range of data patterns and provide significant storage efficiency.

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