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Martin
Asked: 2012-09-05 03:02:35 +0800 CST

How do I measure and compare disk performance of my Hyper-V Windows VM?

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I'm not sure whether this sounds stupid or lazy, but I'm really not sure.

I have a problem with the performance of a VM setup (2008R2-64bit Hyper-V running a 2003R2-32bit Windows server) and I'd like to see whether the disk is the problem.

I want to time a C++ build. It will take x minutes on the real hardware and x+y minutes on the single VM running on this same hardware. (And, y is way too large, hence this question.) I guess I would want to run perfmon during each build and time some counters and then compare the results.

  • Should I run perfmon on the host or on the guest (for the build in the VM)?
  • Which counter(s) should I look at?
  • Should I consider anything besides perfmon?
windows

1 Answers

  1. Best Answer

    I'd say the most relevant counters are:

    • Disk Bytes/s
    • Current Disk Queue Length
    • Avg. Disk Queue Length

    Benchmarking the disks (both virtual and physical) with ATTO may be worth a try as well.

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