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

[Aaron Clark]

Anne Facq wrote:
> 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 

Pardon if this is a dumb question, but why not?

> 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 ?

I suppose you could use the img2qcow tool (possibly directly on 
/dev/vg00/lvfoo) to get a qcow file instead of a raw image.  However, I 
vaguely remember seeing somewhere that the qcow created by the xen tools 
is not necessarily 100% compatible with other qcow tools.

HTH,
Aaron