[linux-lvm] Restoring method Snapshot to Orginal Volume

Antony MARTINEAU Antony.MARTINEAU at lippi.fr
Thu May 29 08:00:21 UTC 2008

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.

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

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

This method is very weight and not useful

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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