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Why does the ONTAP S3 volume show less capacity than the bucket size

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ontap-9
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nas
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Applies to

  • AFF\FAS
  • Ontap 9
  • Ontap S3

Answer

  • When you create an ONTAP S3 bucket, ONTAP automatically provisions a FlexGroup volume in the background.
  • This volume is created with a threshold slightly higher than the bucket size to accommodate metadata and overhead.
  • Since FlexGroup volumes distribute data across multiple aggregates, the available capacity depends on the free space in those aggregates.
    • For example:
    • Bucket size: 90TB
    • Aggregates:
      • aggr1: 33TB free
      • aggr2: 34TB free
      • Total available space: 77TB
  • This explains why the volume shows only 77TB instead of the full 90TB.
  • The volume size reflects the actual usable capacity across the aggregates, not just the bucket configuration.

Additional Information

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