[one-users] Strange behaviour of DEFAULT_DEVICE_PREFIX and TARGET when using Xen in HVM mode

Tino Vazquez tinova at opennebula.org
Wed Aug 31 04:45:42 PDT 2011

Hi Maxence,

Not sure why that is the case. To use /dev/xvd* devices in Xen, domU's
need to load the xen paravirtualization kernel modules.

Maybe loading these drivers as explained in [1] helps?



[1] http://xen.1045712.n5.nabble.com/how-to-create-dev-xvda-td2594051.html

Constantino Vázquez Blanco, MSc
OpenNebula Major Contributor
www.OpenNebula.org | @tinova79

On Wed, Aug 31, 2011 at 1:40 PM, Maxence Dunnewind
<maxence.dunnewind at inria.fr> wrote:
> Hi tino,
>> Sorry for the long delay in answering. Looking to the VM template and
>> the deployment file, it looks like that is what is intended in the
>> OpenNebula side. It instructs the hypervisor to set the disks in the
>> desired places (xvda for the base image, xvdb for the context CDROM,
>> and sde for the datablock).
> what I don't understand is why I would need to set datablock in sd namespace,
> whereas base image and context are in xvd ?
>> In the end, this is passed through to the XEN hypervisor, which may
>> tinker with this values as it sees fit (unfortunately), or even the
>> guest OS may have udev rules that dictate other preferences. I suggest
>> cleaning this rules to see if after reboot the disks end up in their
>> proper places.
> I'll try and come back to you with some results.
> Maxence
> --
> Maxence Dunnewind
> System Engineer on Bonfire
> Research Center INRIA Rennes - Bretagne Atlantique, France
> Team Myriads, Office E219, tel +33 2 99 84 25 76

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