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High CPU utilization and performance imbalance alerts

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Category:
aff-series
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Perf
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Applies to

  • ONTAP 9
  • AFF- A300
  • MGWD
  • HostOS

Issue

  • Frequent performance imbalance alerts on one node

Event: Cluster Load Imbalance Threshold Breached
The performance capacity used counter indicates a load difference of 74% between the nodes on cluster XXX-XXX-XXX and has triggered a WARNING event based on the system threshold of 30%

  • CPU utilization at 70+ % constantly despite Low IOPS
  • Top CPU domain was Host OS , mostly from mgwd from the output of top command 

PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND

3718 root        345  52    0  2217M  1629M uwait    1    ??? 474.57% mgwd

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