Re: [Xen-users] Can not attach vhd image and start vhd-based domU

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2015-05-15 at 14:03 +0300, Andrey wrote:
> Hello,
> 
>   I'm trying to block-attach vhd image to dom0 using blktap2 with xen 
> 4.4 standard package installed on Debian Jessie, but with no luck.
> 
> 'xl -vvv block-attach 0 /home/data/centos-6.vhd,vhd,xvda,w'

As you've observed this will use qdisk not blktap. I suspect your issue
is lack of a qemu process running in dom0 to service the qdisk requests.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770456 .

If you want blktap2 for real then you will need to force the backend
selection.

I don't think that is possible with the deprecated syntax you are using.
According to
http://xenbits.xen.org/docs/4.4-testing/misc/xl-disk-configuration.txt
something like:
    format=vhd,vdev=xvda,access=w,backendtype=tap,target=/home/data/centos-6.vhd
Should do the trick (nb, target= must be last).

For debugging it can be useful to do "xl -N block-attach 0 <diskspec>",
this is just a dry-run block attach to dom0, which will print the parsed
version of the spec

Ian.


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