[Xymon] Windows disk I/O stats

Hi,

I have been asked to provide disk I/O stats for a windows server, this currently has xymonclient.ps1 2.04 and the server OS is 2008 R2 SP1.

I have provided similar in linux end-points using for instance diskstat.pl from Xymonton, but nothing similar seems to exist for Windows. I presume powershell could find this stuff but how expensive would it be to extract this? I dont want the agent to be affecting what we are supposed to be measuring. Has anyone else already been down this path or can they provide me an tips please?

Thanks

Andy