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How concurrency can impact throughput performance with Data ONTAP 7-Mode

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Applies to

  • DATA ONTAP 7-Mode

Description

  • When reads or writes are slow for the host, Little's Law:  N (concurrency) = λ (ops) * W (wait time in seconds) can be applied to determine concurrency of a volume.
  • This is useful because it is a quick way to measure if ONTAP is getting enough workload or a delay exists at network or host using math.

Note: W is short for wait time, but ONTAP uses average response time which is a slightly different measurement than client wait time. The concept is the same in practice.

 

 

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