Hyper-V 2012 R2 new VM with ISO in DVD boot failed - default SCSI not IDE

Question

Hi, have created some VMs fine on 2008R2 and 2012 Hyper-V but now onto 2012 R2, am using the Gen 2 VM and hitting install error when booting them from the 2012R2 RTM .ISO (downloaded straight from Technet) loaded into virtual DVD:
I see from http://social.technet.microsoft.com/Forums/windowsserver/en-US/53f901e4-5bd0-4e13-80a2-bca2f57b15e9/hyperv-unable-to-boot-from-cd-or-iso-in-vm-machine?forum=winserverhyperv that Hyper-V seems unable to boot from a synthetic SCSI until guest OS actually
installed - so Catch-22! But I can't add an IDE Controller because it's not on the list:
I tried the Integration Services and it seems fine on the Settings (including ticking the only one unticked - Guest Services) although if you need to run them from the DVD, it has the same problem - you can see them loaded (or the Win2012R2 ISO) in the DVD
Media but you can't make them run through booting on SCSI!
The physical drives are SATA not SCSI but presumably no matter as Hyper-V runs SCSI virtually, but why does Hyper-V default to SCSI and how do I get the DVD to run off an IDE instead if that is the way to install a base OS from .ISO? Or is there an easier
way than all this?
TIA, Phil.

Answer 1

I found this article:
http://blogs.technet.com/b/jhoward/archive/2013/11/11/hyper-v-generation-2-virtual-machines-part-9.aspx
I hope this help.
"...yes, we’re acutely aware that the generation 2 EFI boot loader messages persist on the screen and it can be a little confusing. Essentially what the generation 2 virtual machine did was:
Attempt to boot from the CD SCSI device containing the Windows 8 ISO. This is where the ‘Press any key…’ message came from. As no key was pressed, we went to the next boot entry. (And this is where we didn’t clear the message from the EFI CD boot loader)
I didn’t press F12 (in fact, this VM wasn’t connected to a network), so network boot failed
The SCSI VHDX is raw with no partitioning or file system, so this too failed
So why did the generation 1 virtual machine start setup from the Windows media? The answer is simply that it’s the way Windows media is built, and it’s inconsistent between the PCAT and EFI loaders.
However, it’s relatively simple to solve if you want to avoid the press any key message. In fact, we almost have all the pieces from previous parts. In particular, part 4 where we injected keyboard drivers into the Windows 8 media.
If you loopback mount Windows 8 or 8.1 RTM media, and navigate to the \efi\microsoft\boot directory, you will see there are two versions of cdboot.efi
The default version, cdboot.efi prompts for a keypress. The unused version, cdboot_noprompt.efi doesn’t prompt.
So it’s fairly simple to create modified media which uses the noprompt version. First, copy the contents of the ISO to a working directory, rename cdboot.efi to cdboot_prompt.efi, and rename cdboot_noprompt.efi to cdboot.efi.
Do the same with efisys.bin and efisys_prompt.bin
Then re-use our oscdimg command (in an elevated deployment and imaging tools environment) from part 4 to recreate the media.
Best Regards:
Tamás