Re: [Xen-users] restoring files to guest domains

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Fajar A. Nugraha wrote:
> Jared wrote:
> > From what I've read of LVM, v2 includes read/write support.  So, I'd 
> > think that I could do the following and it'd just work:
> > lvcreate -L 50G -s -n guest-backup /dev/vg1/guest-disk
> > mount -t ext3 -o rw /dev/vg1/guest-backup /mnt/snapshot
> > cp /mnt/backup/guest/etc/fstab /mnt/snapshot/etc/fstab.restore
> > umount /mnt/snapshot/
> > lvremove -f /dev/vg1/guest-backup
> Dude, it doesn't work that way.
> The way I see it, you're writing data to /dev/vg1/guest-backup, but 
> then you REMOVE the LV afterwards. And you expect it to show up on 
> /dev/vg1/guest-disk?
Don't run the "mount". Use "xm" to export that LVM snapshot to the guest 
domain, and mount it *inside* the guest domain. Then unmount, unexport 
it, and flush the snapshot.
Alternatively, you can completely shut down the guest and mount both 
partitions and copy things to the old guest partition, but I don't think 
you want to do that.
By the way, why are you using partition based LVM images, rather than 
disk based LVM images?


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