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Storage Efficiency anomaly caused audit logs to be truncated

Last Updated:

Applies to

  • ONTAP 9.
  • Storage Efficiency anomaly alert on Active IQ Unified Manager (AIQUM).
  • Audit logs.


  • Alert on AIQUM:
Risk          - Volume storage efficiency anomaly
Impact Area   - Capacity
Severity      - Warning
State         - New
Source        - vserver_02:/vol_02
Cluster Name  - cluster-01
Cluster FQDN  - cluster-01.somedomain.lokal

Trigger Condition - The behavior of volume storage efficiency is not following its historical established pattern.
  • EMS logs:
[?] Sat Sep 03 01:59:44 +0200 [cluster-01: mgwd:audit.log.event:notice]: Auditing error (Audit messages started to drop. Reason = No buffer space available) occurred at 2022-09-0301:59:44.
[?] Sat Sep 03 01:59:45 +0200 [cluster-01: mgwd: audit.log.event:notice]: Auditing error (Audit messages transmissionresumed.) occurred at 2022-09-03 01:59:45.
[?] Sat Sep 03 01:59:54 +0200 [cluster-01: mgwd: audit.log.event:notice]: Auditing error(Audit messages started to drop. Reason = No buffer space available) occurred at 2022-09-03 01:59:54.
[?] Sat Sep 03 01:59:59 +0200 [cluster-01: mgwd: audit.log.event:notice]: Auditing error (Audit messages transmission resumed.) occurred at 2022-09-03 01:59:59.

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