[Fedora-xen] How to backup a Domu filesystem (on LVM) from Dom0 on Fedora 8 ?

[Anne Facq]

Hello

I use XEN on Fedora 8 with Domu on a LVM partition.

Before, on Fedora Core 6, I could backup each Domu by directly mounting 
the filesystem of the Domu (mount /dev/vg00/lvfoo /mnt) and then running 
dump on it.

On Fedora 8, I can't mount directly the filesystem of the Domu, so I 
backup the filesystem of the Domu using the dd command (dd 
if=/dev/vg00/lvfoo of=/var/xen/lvfoo.img)
But the backup with dd is longer and takes more disk space than the 
backup with dump, as dd copies unused blocks.

Is there a better method to backup a Domu filesystem from Dom0 on Fedora 8 ?

Thanks in advance

Anne Facq