Hi,

The intention here is to boot every disk volume using the virtual
Hyper-V SCSI adapter? That would be different than the procedure for
setting up VM guest disks (on Windows systems only?) as described in
Microsoft's Hyper-V docs, but maybe that is the goal.

from http://technet.microsoft.com/en-us/library/dd183729%28WS.10%29.aspx

>You can select either integrated device electronics (IDE) or SCSI devices on 
>virtual machines:
>    IDE devices. Hyper-V uses emulated devices with IDE controllers. You can 
> have up to two IDE controllers with two disks on each controller. The startup 
> disk (sometimes referred to as the boot disk) must be attached to one of the 
> IDE devices. The startup disk can be either a virtual hard disk or a physical 
> disk. Although a virtual machine must use an IDE device as the startup disk 
> to start the guest operating system, you have many options to choose from 
> when selecting the physical device that will provide the storage for the IDE 
> device. For example, you can use any of the types of physical storage 
> identified in the introduction section.
>    SCSI devices. Each virtual machine supports up to 256 SCSI disks (four 
> SCSI controllers with each controller supporting up to 64 disks). SCSI 
> controllers use a type of device developed specifically for use with virtual 
> machines and use the virtual machine bus to communicate. The virtual machine 
> bus must be available when the guest operating system is started. Therefore, 
> virtual hard disks attached to SCSI controllers cannot be used as startup 
> disks.
...
>Note
>Although the I/O performance of physical SCSI and IDE devices can differ 
>significantly, this is not true for the virtualized SCSI and IDE devices in 
>Hyper-V. Hyper-V. IDE and SCSI devices both offer equally fast I/O performance 
>when integration services are installed in the guest operating system.

I can try this early 12.04 code out too on a Hyper-V host. I am using
Ubuntu 10.04 as a guest OS quite a bit on Hyper-V hosts.

Regards,
Tim Miller Dyck

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https://bugs.launchpad.net/bugs/929545

Title:
  Hyper-V: PV Drivers for Ubuntu guests running on Hyper-V lose root
  device to ata_piix

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