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QoS Limits causing high volume latency

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • AFF Series
  • FAS Systems
  • CVO
  • Quality of Service (QoS)

Issue

  • QoS is used to help regulate workloads competing for finite Cluster CPU and Disk resources

  • Elevated LUN /volume/Qtree latency observed once QoS limits are reached
    • As workloads change, QoS limits may need to be adjusted to help manage client performance expectations. 
  • May see this alert:  AIQUM Event alert,  Workload LUN latency threshold breached defined by Performance Service Level Policy
  • Audit logs shows the 
  • Delay center QoS Max will show high latency from CLI
cluster::> qos statistics volume latency show -volume qostest -vserver testsvm
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   646.73ms  1377.00us        0ms   262.00us     9.49ms   635.60ms        0ms        0ms
qostest-wid23..  23350   646.73ms  1377.00us        0ms   262.00us     9.49ms   635.60ms        0ms        0ms
-total-              -   634.31ms  1430.00us        0ms   263.00us     6.78ms   625.83ms        0ms        0ms
qostest-wid23..  23350   634.31ms  1430.00us        0ms   263.00us     6.78ms   625.83ms        0ms        0ms
-total-              -   640.86ms  1324.00us        0ms   304.00us     7.62ms   631.61ms        0ms        0ms
qostest-wid23..  23350   640.86ms  1324.00us        0ms   304.00us     7.62ms   631.61ms        0ms        0ms
-total-              -   659.83ms  1357.00us        0ms   303.00us     7.50ms   650.67ms        0ms        0ms
qostest-wid23..  23350   659.83ms  1357.00us        0ms   303.00us     7.50ms   650.67ms        0ms        0ms

 

 

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