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High CPU utilization due to massive other IOPS

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • NFS

Issue

  • CPU utilization higher than CPU peak performance line in the node. 
  • CPU utilization is near 100%.
  • No obvious high write/read latency shown on volume from CPU D-blade.

Example: Node 18 has a high CPU utilization due to user workload, but other nodes of the cluster are idle/barely utilized as seen in the node shell sysstat -x 1 command.

Note: Columns removed to improve readability

Cluster::> node run node18 sysstat -x 1
CPU    NFS     CIFS   HTTP   Total   Net   kB/s     Disk     kB/s   
                                     in    out      read     write   
100%  65782      0      0   65782  14918   2953948  1325731 14920
99%   64522      0      0   64522  13125   2743195  1256472 12126
99%   64656      0      0   64656  12121   2735679  1211287 12120 
100%  65898      0      0   65989  14812   2948834  1389425 14815 

Cluster::> qos statistics volume latency show
Workload            ID  Latency    Network    Cluster       Data       Disk        QoS      NVRAM
--------------- ------ ---------- ---------- ---------- ----------  ---------  ---------  ----------
total-              -    4.49ms    99.00us    70.00us   4.27ms   153.00us        0ms        0ms
FG_vol18_001..     4201  4.05ms    90.00us        0ms   4.046ms  150.00us        0ms        0ms

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