[CentOS-virt] Xen to KVM migration

Mon Oct 12 17:45:45 UTC 2009
Grant McWilliams <grantmasterflash at gmail.com>

On Mon, Oct 12, 2009 at 10:30 AM, Dennis J. <dennisml at conversis.de> wrote:

> On 10/12/2009 06:17 PM, Grant McWilliams wrote:
> >
> > On Mon, Oct 12, 2009 at 5:48 AM, Dennis J. <dennisml at conversis.de
> > <mailto:dennisml at conversis.de>> wrote:
> >
> >     Hi,
> >     I'm thinking about how to go about migrating our Xen VMs to KVM.
> >     Migrating
> >     the configuraton should be easy using the virsh dumpxml/define
> >     commands but
> >     what is the best way to transfer the (logical volume based) images
> >     without
> >     too much downtime for the guest system?
> >
> >     Can rsync operate on logical volumes? If so I could potentially use
> >     "dd" to
> >     transfer an initial copy of the image to the destination host and
> >     then shut
> >     down the guest, rsync the logical volumes which shouldn't take too
> >     long as
> >     not much data has to be transfered thanks to the initial "dd" and
> >     then boot
> >     the guest on the new machine.
> >
> >     Is something like this possible or would you do something different?
> >
> >     Regards,
> >        Dennis
> >
> >
> > Can't you just use the LV in place with KVM?
>
> I may be wrong about this but isn't running KVM on top of the Xen
> hypervisor a problem? Maybe this has changed but I thought in order to be
> able to use KVM you first have to disable the Xen hypervisor and boot into
> the regular Kernel.
>
> Regards,
>   Dennis
>


But once you have your XEN DomU config file converted to KVM you could in
effect just reboot the Dom0 into a standard kernel and use KVM.

Unless of course you're only moving one DomU to KVM then it wouldn't work.

Grant McWilliams
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