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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Some links and graphs on ESXi capping/throtteling disk speeds

Posted by jpluimers on 2022/01/06

As promised in “Solution” on ESXi 6.7 smartinfo throwing error Cannot open device, here are a few links in capping throttling disk speeds by ESXi followed by a few graphs of my own:

My own observations on ESXi 6.7 update 3:

  1. One rsync operation:
    1 rsync from 860 EVO SSD to 960 PRO NVMe

    1 rsync from 860 EVO SSD to 960 PRO NVMe

  2. Two rsync operations:
    2 rsync from 860 EVO SSD to 960 PRO NVMe

    2 rsync from 860 EVO SSD to 960 PRO NVM

  3. Resume actions were about 10 times faster than the single rsync read speeds:
    Resume action

    Resume action

  4. Suspend actions were between 4 and 6 times faster than rsync write speeds:
    Start of suspend action

    Start of suspend action

     

    Finish of suspend action

    Finish of suspend action

For each rsync operation, I had a separate SSH session going, and the speed doubled.

The resume action of all Virtual Machines was almost a flat speed curve.

The suspend action of all Virtual Machines started fast (when all machines were suspending) and finished slower (when only the largest virtual machines were still suspending)

–jeroen

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