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Cloud Volumes ONTAP NVlog transfer bottleneck - Resolution Guide

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Applies to

Cloud Volumes ONTAP (CVO)

Description

  • Cloud Volumes ONTAP has some architectural differences compared to on-premises FAS/AFF that may lead to the NVlogging component of ONTAP becoming a performance bottleneck
  • Typically this manifests as increased write latency or reduced write throughput
  • This may be observed via the qos statistics volume latency show command, latency shown in the NVRAM column:

Cluster::>qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM
--------------- ------ ---------- ---------- ---------- ----------  ---------  ---------  ---------
-total-              -   136.49ms    99.00us    70.00us   550.00us   153.00us        0ms   136.17ms
vserver1_vol1..   4201   206.05ms   130.00us        0ms   407.88us    44.00us        0ms   205.88ms
vserver5_vol8..   7704   177.54ms   351.00us     1.00us   834.00us   114.00us        0ms   176.33ms
-total-              -   140.29ms   103.00us    75.00us   335.56us   174.00us        0ms   139.94ms
vserver1_vol1..   4201   379.03ms   127.00us        0ms   234.73us   175.00us        0ms   378.73ms
vserver5_vol8..   7704   253.02ms   309.00us     1.30us   820.00us   105.00us        0ms   251.37ms

 

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