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What is the difference between SVM latency and volume latency in AIQUM?

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Applies to

  • Active IQ Unified Manager (AIQUM)
  • ONTAP 9

Answer

  • SVM latency is displayed by selecting Performance: All Storage VMs view in STORAGE > Storage VMs. This is based on the IOPS and time to respond to the requests per SVM.
  • Volume latency is displayed by selecting Performance: All Volumes view in STORAGE > Volumes. This is based on the IOPS and time to respond to the requests per volume.
  • SVM latency does not mean the average latency of all volumes under the SVM.

    Example: 
    Assuming the SVM contains two volumes, volumeA and volumeB, with following statistics:

    volumeA : IOPS 100[op] and Time to respond 1000[ms]
    volumeB : IOPS 400[op] and Time to respond 12000[ms]
     
    • The volume latency of volumeA is 10[ms/op] calculated by 1000[ms]/100[op]
    • The volume latency of volumeB is 30[ms/op] calculated by 12000[ms]/400[op]
    • The SVM latency is 26[ms/op] calculated by (1000+12000)[ms]/(100+400)[op]

Note: AIQUM gethers these performance statistics from ONTAP cluster every 5 minutes

Additional Information

 

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