Re: [Xen-devel]xl create PV guest with qcow/qcow2 disk images fail

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 19 Oct 2011, Fajar A. Nugraha wrote:
> On Wed, Oct 19, 2011 at 5:55 PM, Stefano Stabellini
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> >> This is a PV guest configured with pygrub, correct?
> >> If so, qcow/qcow2 are not supported in this scenario.
> >>
> >> You could:
> >>
> >> - avoid using pygrub (specify the kernel manually) and keep using 
> >> qcow/qcow2;
> >> - switch to raw disks and keep using pygrub;
> >> - install a Linux kernel that support blktap2 (like the XCP kernel, see
> >>   http://wiki.xen.org/xenwiki/XenDom0Kernels) and switch to VHD format.
> >>
> >
> > The way to make it work would be to call qemu-nbd and nbd-client from xl
> > so that a /dev/nbd0 comes up in dom0 and pygrub can use it to extract
> > the kernel and initrd from the qcow2 image.
> 
> would pv-grub work? If yes, it would give better performance compared
> to nbd workaround.

Yes, it should. That would be the other alternative.

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