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Physical Disk - Average Disk Queue Length

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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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makes sense, thanks
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