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CONTAP-519736: synchronous SnapMirror High CIFS IO latency after upgrading to 9.14.1

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Issue

  • Increase in latency reported on multiple volumes with synchronous snap mirror running and Oplock enabled on the CIFS shares impacted.
  • The latency reported can reach upward of 2-3 seconds in Graphana or AIQUM but not reported in QOS statistic volume latency show command.
  • Performance archives data covering the issue shows the high latency in the workload graph view with low IOPs and high concurrency on other IO.

  • packet traces captured during the issue shows high SRT's from the storage with File Lock Break not registering on the clients.
  • Multiple repl.switch.to.seq.split events with high operation latency reported in EMS during the issue: 

Mon Aug 11 08:07:19 -0400 [Node-Name: repl_Handle_sync_resl: repl.switch.to.seq.split:notice]: Operation Latency has exceeded the threshold value "2890" in the parallel split mode for sync relationship with UUID "11111111111111111".
  • The latency drops down to expected values when synchronous SnapMirror of the volume impacted is disabled.

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