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CONTAP-229260: intensive writes results with High CPU on All SAN Array

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Issue

  • Write workload increased on LUNs or Volumes
  • While latency is noticeable:
    • [ *> node run -node <node_name> -command "priv set diag;systat -x" ] reveals:
      • 100% CPU
      • Column: [ CP_Ty ] marked as: B (Back-to-Back Consistency Points)
    • [ *> node run -node <node_name> -command "priv set diag;systat -M 1" ] reveals high [ nwk_exempt ]
  • Platform is All SAN Array (ASA)
  • Similar workload on All Flesh FAS (AFF) seems to behave differently

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