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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 14 Oct 2011, Chun Yan Liu wrote:
> Hi, List,
> 
> I'm trying xl create a pv guest with qcow/qcow2 image, it always fails at 
> libxl_device_disk_local_attach.
> #xl create pv_config_file
> libxl: error: libxl.c:1119:libxl_device_disk_local_attach: cannot locally 
> attach a qdisk image if the format is not raw
> libxl: error: libxl_create.c:467:do_domain_create: failed to run bootloader: 
> -3
> 
> disk configuration is:
> disk=[ 'tap:qcow2:/var/lib/xen/images/sles11pv/disk0.qcow2,xvda,w', ]
> 
> Is there any way to make it work?

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.

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