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CPU over-subscription leads to QoS minimum latency and user slowness

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9.7+

Issue

QoS latency is observed for workloads utilizing QoS floors or adaptive QoS and the nodes hosting the workloads are experiencing a CPU bottleneck.
 
To check if a node is experiencing a CPU bottleneck, the following command can be used:
 
cluster::> system node run -node -command sysstat -x 1
 
To check if the latency is due to QoS minimums, the following command can be used:
 
cluster::> qos statistics volume latency show -volume VOLUME_NAME -vserver VSERVER_NAME
 
The majority of latency will be observed under the column labeled Qos Min

 

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