Measuring performance of virtual disks under Windows 2003

T

twocell

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May 12, 2010
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I've been getting some strange results when I run benchmarks on one of my Windows 2003 virtual machines. I'm seeing throughput of 350 MB/s on a virtual disk. Only about 260 MB/s faster than the real (host) disk speed.

I've used hdparm -t under Cygwin and HD Tune Pro, and I'm getting similar results. The only thing I can think of is some kind of caching, but the random access scores are sky high too.

Any ideas?
 
This is almost certainly caching.

Can you post the /etc/qemu-server/<vmid>.conf for the VM and also the results of pveperf /var/lib/vz.

For a bog standard test I generally create a 5GB file and then time how long it takes to copy....
 
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