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TRID-20819: Snapshot deletion blocked by hidden offline FlexClone on NetApp ASAr2 storage with Trident

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trident-kubernetes
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SNAPX
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Issue

  • After deleting a PVC or clone PVC, deletion of the associated Kubernetes VolumeSnapshot/VolumeSnapshotContent fails indefinitely.
  • The following entries are seen:

  1. ONTAP error code 1638555:

level=debug msg="Could not delete the snapshot, going to check if it's busy; error was: API State: failure, Message: Snapshot \"snapshot-xxxx\" of volume \"trident_pvc_xxxx\" in Vserver \"<SVM>\" has not expired or is locked. Use the \"snapshot show -fields owners, expiry-time, snaplock-expiry-time\" command to view the expiry and lock status of the snapshot., Code: 1638555" logLayer=core requestID=xxxx requestSource=CSI workflow="snapshot=delete"
  1. snapshot show -fields owners reports the snapshot owner as volumeclone.
  2. The deleted clone appears in volume clone show as offline, but is absent from volume show and storage-unit show.
  3. Manual attempts to delete or purge the clone fail:
    • volume clone delete returns Error: 'delete' is not a recognized command  
    • The volume recovery queue and volume clone split are not available on ASA r2 systems.
  4. Trident controller logs show repeated split timer resets:

level=warning msg="Initial locked snapshot delete, starting clone split timer." logLayer=core requestID=xxxx requestSource=CSI secondsBeforeSplit=120.00 snapshot=pvc-xxxx/snapshot-xxxx workflow="snapshot=delete"
  • Periodic backend reconcile triggers every 300–550 seconds, resetting the in-memory split timer and preventing the split from ever completing.

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