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Using ESXTOP to check VAAI primitive stats

Duncan Epping · Dec 20, 2012 ·

Yesterday a comment was made around a VAAI primitive on my article about virtual disk types and performance. In this case “write same” was mentioned and the comment was about how it would not be used when expanding a thin disk or lazy zero thick disk. Now the nice thing is that with ESXTOP you can actually see VAAI primitive stats. For instance “ATS” (locking) can be seen, but also… write same or “ZERO” as ESXTOP calls it.

If you open up ESXTOP and do the following you will see these VAAI primitive stats:

  • esxtop
  • press “u”
  • press “f”
  • press “o”
  • press “enter”

The screenshot below shows you what that should look like, nice right… In this case 732 blocks were zeroed out using the write-same / zero VAAI primitive.

VAAI primitive stats

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Related

Storage 5.0, 5.1, esxtop, Storage, vaai, vSphere

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Comments

  1. Cormac says

    20 December, 2012 at 15:31

    Now if we could only get VAAI stats for NAS 🙂

    • Nick Howell says

      20 December, 2012 at 15:49

      Yup, This.

  2. Jason Boche says

    7 March, 2013 at 23:28

    Is there a documented method of resetting the VAAI counters back to zero in esxtop without rebooting the host?

    • Dan W says

      27 June, 2013 at 17:35

      I am also very interested in this. Has anyone come up with an answer?

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About the author

Duncan Epping is a Chief Technologist in the Office of CTO of the Cloud Platform BU at VMware. He is a VCDX (# 007), the author of the "vSAN Deep Dive", the “vSphere Clustering Technical Deep Dive” series, and the host of the "Unexplored Territory" podcast.

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