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Reocurrent Volume Latency and IOPS breaching critical threshold

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cloud-volumes-ontap-cvo
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perf
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Applies to

  • ONTAP 9
  • CLOUD VOLUMES ONTAP (CVO)

Issue

  • Daily reoccurring latencies breaking 200ms/op threshold at about the same hour
  • The events typically last around 10 minutes and impact a single NFS volume
  • The specific client workload details and timing patterns are still pending from the customer
  • Aggregate is experiencing a long CP during the same time
  • qos shows Network latency as highest for the affected volume
::> qos statistics volume latency show -vserver <svm> -volume vol01
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM      Cloud  FlexCache    SM Sync         VA      AVSCAN
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   609.56ms   523.19ms        0ms    78.13ms   187.00us        0ms        0ms     7.98ms    78.00us        0ms        0ms        0ms        0ms
vol01-w..  12345  1040.89ms   918.04ms        0ms   109.95ms   169.00us        0ms        0ms    12.60ms   139.00us        0ms        0ms        0ms        0ms
-total-              -   460.17ms   409.43ms        0ms    45.45ms   313.00us        0ms        0ms     4.87ms   100.00us        0ms        0ms        0ms        0ms
vol01-w..  12345   860.43ms   777.27ms        0ms    75.24ms   225.00us        0ms        0ms     7.50ms   191.00us        0ms        0ms        0ms        0ms
-total-              -   352.25ms   282.18ms        0ms    62.86ms   159.00us        0ms        0ms     6.98ms    75.00us        0ms        0ms        0ms        0ms
vol01-w..  12345   950.57ms   785.62ms        0ms   148.29ms   148.00us        0ms        0ms    16.31ms   209.00us        0ms        0ms        0ms        0ms

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