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CONTAP-468748: FlexGroup write placement continues to select full constituents even when other constituents have available capacity

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ontap-9
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core
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Issue

  • After a FlexGroup is expanded (additional constituents added), new write and object allocations can continue to prefer older, highly utilized constituents.
  • Those older constituents may remain near full (for example ~99% used with 0 B available) even when newer constituents, or other aggregates in the FlexGroup, have substantial free space.
  • Client applications writing to the FlexGroup — including ONTAP S3 buckets backed by a FlexGroup, and FabricPool capacity-tier PUT activity directed at that object store — can fail with no-space / object-store-full style errors despite free capacity elsewhere in the FlexGroup.
  • On diagnostic review of FlexGroup ingest heuristics for a fully urgent constituent, Urgency can show 100% while Target% remains non-zero (for example around 11%), so the full constituent continues to receive a share of new allocations.
  • Moving or resizing constituents can restore usable free space; upgrading alone does not add free space to constituents that are already full, and does not redistribute existing objects.

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