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CONTAP-718364: FlexCache origin volumes: Aggregate “Total Used” grows due to X-reserves, leading to out-of-space and data unavailability

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ontap-9
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nas
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Issue

  • ONTAP clusters with FlexCache origin volumes show aggregate space “Total Used” increasing rapidly while “Total Physical Used” remains comparatively low
  • Aggregate can reach full / near-full, triggering out-of-space behavior and potential data unavailability
  • Typically observed on systems with *>64 GB memory* running ONTAP 9.16.1 with long uptime after upgrade

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