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High latency on SolidFire storage volume due to Max IOPs QoS set too low

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Applies to

  • NetApp Element software
  • NetApp SolidFire
  • NetApp HCI

Issue

  • High latencies reported against a SolidFire storage volume can be observed in different ways
  • If you are using VMware, the message "performance has deteriorated" will be observed in Monitor > Events:
2021-11-26 10_57_45-vSphere - NetApp-HCI-Datacenter - Events.png
  • In SolidFire Active IQ (AIQ) under Volumes > Active Volumes > Actions > View Details > Latency you will observe higher than expected latency values:

clipboard_e38f5eabf411b19b2f41c87e21a67693b.png

  • In the Element UI under Reporting > Volume Performance you will observe higher than expected latency values:

clipboard_e14073cb487e42c5da83c122f7c2e3a25.png

  • You will also notice during high latency that the throughput is hitting its highest peak based on the Max QoS set. Below example shows QoS Max of 15,000 IOPS with a max throughput of 100 MB/sec, but when you look on the overall cluster performance is relatively very low:

clipboard_ebcf8fc59e708da82ed6892e2f088070d.png

  • Cluster overall performance shows barely hitting 5% 

clipboard_e66fd32446871c11abefcc61b169a1640.png

 

 

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