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Why is the storage efficiency savings percentage at the volume level different from that at the aggregate level?

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  • Deduplication is supported within volumes and across volumes within an aggregate. However, the scope of Data Reduction is different:
    • Volume Level: Efficiency is calculated based only on data within that specific volume. Deduplication and compression are applied to the data in that volume.
    • Aggregate Level: Efficiency is calculated across all volumes in the aggregate. Deduplication can find and eliminate duplicate blocks between volumes, not just within one.
  • If deduplication is enabled both volume and aggregate-level, the calculations can include savings from deduplication and compression across multiple volumes, as well as shared metadata and overhead, whereas volume-level calculations only consider data within that specific volume. This means aggregate-level savings are usually higher and more comprehensive.

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