Skip to main content
NetApp Knowledge Base

High CPU utilization due to massive other IOPS

  1. Last updated
  2. Save as PDF
Views:
591
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

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

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.