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NFS high write latency even though overall CPU utilization is low

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Applies to

  • NFS
  • Write heavy
  • FlexGroup

Issue

  • High NFS write latency
  • The delay appears as CPU D-blade / WAFL CPUtime
  • Overall node CPU utilization is not high
  • Some writes slow-path to the VOL_LOG affinity with reason counter showing SERIAL_INODENOTMINE_EXCLUSIVE

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