[CentOS-virt] Xen to KVM migration
grantmasterflash at gmail.com
Mon Oct 12 18:45:45 UTC 2009
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.
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.
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