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CAIQUM-8908: Active IQ Unified Manager raises false Volume Logical Space Full or Nearly Full threshold breach alert when inode usage on a thin-provisioned, deduplication-enabled FlexVol is high but actual logical-space usage is low

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Issue

Active IQ Unified Manager generates a "Volume Logical Space Full" or "Volume Logical Space Nearly Full" threshold breach event for a FlexVol whose actual logical-space utilization, as reported by ONTAP, is well below the configured threshold.
Observed conditions on the affected volume:

  • Thin provisioning is enabled (space-guarantee = none).
  • Deduplication / storage efficiency is enabled.
  • Logical-space reporting and logical-space enforcement are enabled.
  • Inode usage on the volume is high (typically above the configured logical-space threshold).
  • Actual logical-used percentage reported by ONTAP is low (commonly single-digit).

ONTAP does not raise a corresponding wafl.vol.full event, and the alert clears at the next Active IQ Unified Manager acquisition cycle without any change being made on the array.
The alert can be reproduced by inspecting the volume from ONTAP at the time the event fires:

cluster::> set advanced
cluster::*> volume show -volume <volume_name> -fields size,logical-used,logical-used-percent,is-space-reporting-logical,is-space-enforcement-logical
cluster::*> df -i <volume_name>

The ONTAP-reported logical-used-percent is far below the threshold while the inode usage is high. Active IQ Unified Manager nevertheless reports the volume as breaching the logical-space threshold.

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