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High latency and disk utilization in Azure CVO due to disk limitations

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Helpful 

Applies to

  • ONTAP 9
  • Cloud Volumes ONTAP (CVO) for Azure

Issue

  • ONTAP reports high latency from disk
    • Example: Running qos statistics volume latency show has high latency in disk column
Cluster::> qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -     8.88ms     2.82ms     1.00us  1032.00us     5.02ms        0ms     2.00us        0ms
vol1-wid34121    34121   137.73ms     1.91ms     1.00us    22.93ms   112.89ms        0ms        0ms        0ms
vol2-wid34122    34122   133.29ms     1.82ms        0ms     2.84ms   128.62ms        0ms        0ms        0ms
vol3-wid34123    34123    78.48ms     1.96ms        0ms     7.69ms    68.83ms        0ms        0ms        0ms
vol4-wid34124    34124    50.51ms   239.00us        0ms   995.00us    49.28ms        0ms        0ms        0ms
  • Monitoring software may show a high utilization spike, such as the Aggregate view of Active IQ Unified Manager or Harvest:

 

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