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High latency due to deletion workload

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • Deletion workload

Issue

  • High latency is seen from users or from commands such as qos statistics volume latency show from the Data column.
  • EMS messages related to this may be seen (from event log show) such as:
[wafl.zombie.susp.msg.threshold:notice]: WAFL(R) is experiencing zombie throttling possibly due to requests for large number of file deletions.
[wafl_exempt08: wafl.cp.toolong:error]: Aggregate fas_01_DATA_AGGR experienced a long CP...
    This message occurs when a WAFL(R) consistency point (CP) takes longer than 30 seconds. A CP lasting more than 30 seconds might cause
    client latency and potentially a client outage.
   
  • High CPU Utilization spike also may be observed within wafl exempt processing domain.

 

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