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AIQUM 9.7+ or NSLM may enable workload AQoS causing unexpected latency

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ontap-9
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perf
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Applies to

  • ONTAP 9.3 or later
  • Active IQ Unified Manager (AIQUM) 9.7 or later
  • Adaptive QoS (AQoS)
  • NetApp Service Level Manager (NSLM) 1.2 or later
  • Performance Service Level (PSL)
  • Workloads are created from NSLM or AIQUM

Issue

  • Workloads can be throttled by AQoS without manually creating an AQoS policy explicitly.
  • This unexpected AQoS policy attached to a workload might lead to high latency in the QoS Min delay center. 

Example:

Cluster::> qos statistics volume latency show
Workload             ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM
---------------  ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
...
vol1-wid21368     21368   879.73ms   283.00us     9.00us   498.00us   184.00us        0ms   877.99ms   216.00us
vol2-wid19287     19287   736.25ms   401.00us     8.00us   734.00us   166.00us        0ms   734.91ms   199.00us

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