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CONTAP-766880: System Slowdown and Disruption While WAFL Iron Is Running on an AFF A90

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Issue

While wafliron is running on an aggregate, the storage system can slow down a lot. Here is what you may see:
  • Management commands respond slowly or stay queued, with messages such as: The job will be picked by the node when sufficient resources are available.
  • Logging in to the node is slow or fails.
  • Consistency points take much longer to complete.
  • In the end, the node may panic with a message similar to:

WAFL hung for <volume_name> during WAFL_CP_STATE_CLEANING_SPECIAL_VVOL (TSSE_BKG_POST_OOCP_DRAIN).
During this time, client access (NFS/SMB) to data on the affected node can be interrupted.

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