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High CPU utilization with many concurrent 'block ownership' scanners

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data-ontap-7
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7dot
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Applies to

ONTAP 8.1 7-Mode

Issue

  • Transition (TDP) replication from 7-mode to C-mode is slow.
  • There are many background processes running such as: NDMP, schedule snapshots and snapmirror.
  • WAFL scans are taking a lot of CPU time in wafl_exempt and causing delays for "Kahuna" domain to run. 
  • The Kahuna is a Serialized WAFL and on an average it is more than 80% utilized.

 

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