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[Xen-users] Problems attaching/using vhd as guest disk

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Derry Bryson <derry@xxxxxxxxxxxxx>
  • Date: Fri, 11 Jul 2014 18:39:00 +0000
  • Accept-language: en-US
  • Delivery-date: Fri, 11 Jul 2014 18:40:00 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: Ac+dNU1O+k8GAeKZS0OIjslw1UKHjA==
  • Thread-topic: Problems attaching/using vhd as guest disk

I am on Ubuntu 14.04, with xen-hypervisor and blktap-dkms installed.  I have a vhd file containing a Windows Server 2008 R2 boot disk that was created by ShadowProtect’s headstart restore and hardware independent restore.  I can get it to work if I use the tap-ctl program to setup a blktap device and use that as the disk with the following in the xl config file:
Disk = [‘/dev/xen/blktap-2/tapdev0,,hda,rw’]
However, that is a pain to setup and everything I am reading says I shouldn’t use blktap anymore.  Seems like in Xen 4.4,  I should be able to just use:
Disk = [‘/path/to/my.vhd,vhd,hda,rw’]
But that doesn’t work.  It starts to boot and then blue screens.  When I look at the disk by booting the vm into a recovery iso, I can see the vhd “disk” just looks like the raw vhd file.
Anybody have any idea what I am doing wrong?
Derry Bryson
Senior Software Engineer
Highly Reliable Systems
Backup should be easy and affordable
775-329-5139 ext *129
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