Hyper-V:Issue in accessing pass-thru disks in VM

NTDEV
1

I?m seeing a problem while configuring the pass-through disks in 2008 x86 VM. The disks are accessible in host system and are all configured as SCSI pass-through disks to one of the VM (2008 x86). When I try to access them in VM disk manager, it says ?the request could not be performed because of an i/o device error". I?m seeing this problem only with 2008 x64 as a host OS. No problem with R2 and also no problem with 2008 x64 as a VM.

But if I configured the same disks as VHD rather than pass-through, then I don?t see this problem. I put breakpoints and debug prints in my virtual miniport driver (actual driver) to capture any SCSI failures. I didn?t hit any of them. All the logs are clean, no errors. Any thoughts?

-Raj

2

The disks have to be set offline in the host Disk Manager.

3

Yes, they were offline in host system. Other wise you cant assign them to VM in settings.