[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 ?

MARTINEAU Antony Service informatique Assistant informatique LIPPI Management	La Fouillouse 16440 Mouthiers sur Boheme Tel.: 05.45.67.34.35 Courriel: antony martineau lippi fr http://www.lippi.fr

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