[linux-lvm] Restoring method Snapshot to Orginal Volume

[Antony MARTINEAU <Antony MARTINEAU lippi fr>]

Hello,
I am using LVM2 whith XEN
All of my DomU disks are one or more
logical volume
For exemple /dev/vg0/lv1

For the moment when i want do a domU
backup, i take a snapshot, do an image (dd gzip) of the snapshot, delete
the snapshot and restor the dd image on the original logical volume.
so

Backuping
lvcreate -s -L500M -nlv1.snap /dev/vg0/lv1
dd if=/dev/vg0/lv1.snap bs=16M | gzip
| dd of=/lv1.gz bs=16M
lvremove /dev/vg0/lv1.snap

Restoring
gzip -dc /lv1.gz | dd of=/dev/vg0/lv1

This method is very weight and not useful

ideally 
dd if=/dev/vg0/lv1.snap of=/dev/vg0/lv1
should be perfect but it is impossible because when restoring snapshot
on the original volume, the snapshot continue to increase until to become
fully and inactive

Is there a solution to deactive the
cow (copy and write)for during the restoration about snapshot to original
volume ?

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