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High NVLOG latency in Cloud Volumes ONTAP due to uneven disk RAID layout

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cloud-volumes-ontap-cvo
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Applies to

  • ONTAP 9
  • Cloud Volumes ONTAP

Issue

Latency is seen in qos statistics volume latency show under the NVRAM column.
::> qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   195.97ms   150.00us        0ms   796.00us        0ms        0ms  1195.03ms        0ms        0ms        0ms
data1-wid30897   30897      1.60s   157.00us        0ms   818.00us        0ms        0ms      1.60s        0ms        0ms        0ms
-total-              -   536.23ms   110.00us        0ms   495.00us        0ms        0ms   535.63ms        0ms        0ms        0ms
data1-wid30897   30897        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms
-total-              -      7.42s   136.00us        0ms   743.00us        0ms        0ms      7.42s        0ms        0ms        0ms
data1-wid30897   30897  1137.67ms     1.65ms        0ms     3.55ms        0ms        0ms  1132.47ms        0ms        0ms        0ms

 

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