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CONTAP-667282: Deduplication hang in DEDUPING_SHARING after a manual efficiency scan due to stale overlap requests

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Category:
ontap-9
Specialty:
core
Last Updated:

Issue

  • On FSx volumes with deduplication enabled, a manual efficiency scan may cause deduplication to stall indefinitely in the DEDUPING_SHARING stage. The session does not complete and subsequent efficiency operations cannot proceed.
  • SIS.logs:

Fri Feb 27 22:36:18 -03 2026 [Vserver UUID: ] /vol/vol_name [sid: 0] Warning (SE Gather operation is stopped by the user and further automatic deduplication will not be triggered on the volume until the user triggers manually on it.)
  • Vol efficiency show stuck at 99%:

Vserver    Volume           State     Status      Progress           Policy
---------- ---------------- --------- ----------- ------------------ ----------
Vserver       vol_name      Enabled    Active      4309428 KB (99%)Done auto

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