SCSI disk in Hyper V, Server 08, no drivers

davewag77
davewag77 used Ask the Experts™
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Hi Everyone,

I'm trying to get a pass through drive to work in hyper v. I took the physical device off line, added the physical drive through the SCSI controller. I don't see the drive in disk manager, etc, so I checked the device manager and found, under other devices, a SCSI disk drive thats showing "working properly" but has the ? driver. Integration services are installed. Both host and vm are server 08 R2, fully updated. Any ideas on how to get the scsi pass through to mount? It is not a boot drive, just extra storage.

Thanks!
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Svet PaperovIT Manager

Commented:
Could you give more information, please:
 - What is the size of the physical disk?
 - How is it connected to the host (internal or iSCSI)?
 - Is it accessible on the host (when it's online)?

Thanks

Author

Commented:
Its an internal sata drive, 750 gb, and it is accessible when online.

Thanks
Svet PaperovIT Manager

Commented:
750GB disk can be attached as IDE. There is no difference in the performance of IDE and SCSI attached disks in Hyper-V

Author

Commented:
It's currently attached as IDE but I plan on using larger drives in the near future.
Svet PaperovIT Manager

Commented:
So, does it works as an IDE drive or it still doesn't?

Author

Commented:
yes it works as an IDE, not working as SCSI
IT Manager
Commented:
I suspect there is something to do with the fact you are attaching an IDE disk on a SCSI controller. I suspect that Hyper-V is not able to translate the SCSI commands in IDE. However, I wasn’t able to find a confirmation on Internet and I don’t have the right setup to test it, so this is just a theory. But, I fount a related post with a similar issue: http://serverfault.com/questions/231480/does-hyper-v-support-scsi-pass-through-discs-in-a-server-2003-r2-vm

On IDE vs. SCSI in Hyper-V question, here is a post that gives you more detailed comparison: http://social.technet.microsoft.com/Forums/en/winserverhyperv/thread/ffc967bb-7876-4381-b8eb-4540b56f18be

The only limitation you could have with pass-through on IDE controller is the limited number of IDE controllers and attached devices: 4 in total, where 2 are already taken by the boot disk and the virtual DVD.

I am using pass-through disks on SCSI controllers but the physical disks are iSCSI connected. So, if you are planning to expand your configuration by using iSCSI (or directly attached SCSI), this won’t be a problem.

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