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Elevated CPU or high cluster latency when using indirect traffic

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181
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Elevated CPU observed when using indirect traffic
    • Example: Running the sysstat -M command shows high CPU in Nwk_Exmpt or Network Exempt CPU domain
    • Note: output is missing columns for readability in this article
Cluster::> set advanced

Warning: These advanced commands are potentially dangerous; use them only when directed to do so by NetApp personnel.
Do you want to continue? {y|n}: y

Cluster::*> node run -node <node> sysstat -M 1
AVG Nwk_Exmpt
61% 994%
60% 988%
60% 974%
61% 971%
  • High latency may also be seen in the cluster network
cluster1::> qos statistics volume latency show -iterations 100
Workload        ID      Latency  Network  Cluster   Data     Disk     QoS       NVRAM      Cloud
--------------- ------ -------- -------- -------- -------- -------- -------- ---------- ----------
-total-                110.35ms    0ms   110.02ms 327.00us      0ms      0ms        0ms        0ms
vs1vol0         111    167.82ms    0ms   167.22ms 603.00us      0ms      0ms        0ms        0ms
vol1            1234   117.76ms    0ms   117.56ms 191.00us      0ms      0ms        0ms        0ms

 

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