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Controller disruption and data inconsistencies might occur during certain write operations: Active IQ Wellness

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Applies to

  • Active IQ Wellness Risk
  • ONTAP
    • 9.11.1
    • 9.10.1
    • 9.9.1
    • 9.8
  • AFF and FAS systems are affected
    • Data aggregates (excludes root)
    • Where the FAS system is the snapmirror destination for the AFF system volume. If a FAS system is not serving as a snapmirror destination for an AFF system volume, then that FAS system is not exposed to this issue.
    • Destination aggregate has auto-adaptive-compression-savings set to false 
    • SnapMirrors and Volume moves involved 

Risk Summary

An aggregate  has adaptive compression disabled which makes it potentially susceptible to Bug 1493600.

  • In ONTAP releases 9.8 through 9.11.1,  data might get written in an unsupported format when one or more of the following operations are performed for a volume whose destination aggregate has auto-adaptive-compression-savings set to false but runs as enabled (true) during any of the following write operations:
    • Volume move operations.
    • SnapMirror data protection (DP) transfers.
    • volume encryption rekey  operations.
    • CSC (Contiguous Segment Cleaning) scanner operations.
    • Block reallocation scanner operations.
  • Read operations of the unsupported blocks will trigger a controller disruption followed by data inconsistency as below:

Panic String: volume or its aggregate does not have HAS_CDE. in aggregate aggr1. WAFL inconsistent. Contact NetApp technical support. in SK process wafl_exempt13 on release 9.8P11 (C)

 

 

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