[CentOS-virt] Xen to KVM migration

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