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High CPU and write latency on FAS8200

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Category:
ontap-9
Specialty:
Perf
Last Updated:

Applies to

  • FAS8200
  • ONTAP 9.14

Issue

  • High CPU utilization and increased write latency were observed on the cluster node, impacting CIFS volumes and resulting in increased service times.
  • CPU utilization increased from a baseline of approximately 20% to around 50%, reaching near-maximum levels during efficiency and deduplication operations.
  • Performance archives and logs indicated that operations on Node were taking approximately 3–6 times longer than under normal conditions. However, no unusual I/O activity or significant background workload was observed during the reported impact period.

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