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Physical Disk - Average Disk Queue Length

Posted on 2009-07-07
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Last Modified: 2012-06-27
Hi,
    I have a question about the "Physical Disk - Average Disk Queue Length" windows performance counter.
     
     I have a physical disk (500GB @ 7200 rpm) on my host machine (H:). I have installed Virtual Server witch a .vhd virtual disk that is located to the same physical disk mentioned above. (H:).
     Does anyone have any idea why, when performing high disk activity inside the Virtual machine, opening the Perfmon from inside the Virtual machine, the AVG disk queue length for the drive has a value of 5 but the Perfmon from the Host OS shows only 0.9. Both PerfMons are ran at the same time.


Thanks for your answers

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Question by:rares_dumitrescu
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DCMBS earned 500 total points
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The Physical Disk - Average Queue length shows the number of transactions queued up by the O/s and waiting to be flushed to disk.  The fact that thye Virtual machine has a higher count than the Host bindicates the O/s on the VM is having to wait to pass the requests to the host.
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by:rares_dumitrescu
ID: 24817560
makes sense, thanks
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