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xen-users
Re: [Xen-users] cloning guests between Dom0's ?
John Haxby wrote:
For a LVM LV you can do the following (using the LVM snapshot)
without shutting down the domU:
lvcreate -s /dev/vg/domU -L1G -n domU_snap
mkdir /mnt/domU_snap
mount /dev/vg/domU_snap /mnt/domU_snap
tar cvjpf /storage/path/domU_snapshot.tbz /mnt/domU_snap
lvremove /dev/vg/domU_snap
Is this correct ? I know the LVM snapshot will give you a "point in
time" image, but won't the DomU have unwritten changes in it's
cache - giving you a very unclean filesystem ?
You probably want to use kpartx on the snapshot and mount the right
partition for backups. However, as you'll say, you'll probably
come unstuck when you try to mount the file system because it will
be corrupt. You need to cooperation of both the OS and any running
applications in the domU for this approach to work. A good way to
get everything consistent for backing up is to shut down the guest
OS, take the snapshot and the re-start the guest OS. Or at least
have the guest unmount the file system(s) you're going to back up
before you take the snapshot.
Backing up data from a machine (physical or virtual) is surprisingly
difficult unless you can enlist the help of the machine. It's
almost always easier to do it from within the machine.
Just checking I hadn't missed something !
I agree, it's a lot easier to just do it from within the client, or
to shut the client down.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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