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

  • To: Philipp Hahn <hahn@xxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Derry Bryson <derry@xxxxxxxxxxxxx>
  • Date: Mon, 14 Jul 2014 16:52:12 +0000
  • Accept-language: en-US
  • Delivery-date: Mon, 14 Jul 2014 16:52:16 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: Ac+dNU1O+k8GAeKZS0OIjslw1UKHjACKa6oAAAj3rOA=
  • Thread-topic: [Xen-users] Problems attaching/using vhd as guest disk

I'm not sure I follow.  Are you saying the vhd created by ShadowProtect is a 
differencing disk?  I only have one vhd file and I thought using a differencing 
disk required a parent and child vhd with the child being the differencing 

-----Original Message-----
From: Philipp Hahn [mailto:hahn@xxxxxxxxxxxxx] 
Sent: Sunday, July 13, 2014 10:28 PM
To: Derry Bryson; xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] Problems attaching/using vhd as guest disk


On 11.07.2014 20:39, Derry Bryson wrote:
> 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?

VHD/VPC in QEMU doesn't support differencing disks, only fixed and dynamic 

A patches was proposed to [Qemu-devel] named "[RFC PATCH v1] Support vhd type 
VHD_DIFFERENCING" on July 1st by Ding xiao, but as QEMU is currently in freeze 
for its next stable release, the patch has not been reviewed.


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