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Re: [Xen-users] Yet another backup proposal (file based vbd's & lvm)
- To: "Roger Lucas" <roger@xxxxxxxxxxxxx>
- From: "Kenneth Kalmer" <kenneth.kalmer@xxxxxxxxx>
- Date: Wed, 18 Oct 2006 23:36:15 +0200
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 18 Oct 2006 14:37:03 -0700
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On 10/18/06, Roger Lucas <roger@xxxxxxxxxxxxx> wrote:
Hi Ken,
> I'll definitely look into this setup. I was trying to avoid LVM two
> reasons (Roger, this one's for you), the apparent snapshot issue that
> everyone seems to complain about throughout the list and the issue of
> live migrations between hosts. But this is only using LVM as a backend
> for the domU's. I use LVM on the NAS with ext3 for the ability to grow
> my partitions as needed and resize the ext3 fs on top of the volumes,
> and it works beautifully.
>
> Luke, I'll setup a test server here using read-only LVM snapshots and
> keep on backing them up to see if I get the lockups that the previous
> posts in the archive (and the kernel archives) mention. I'll report my
> successes here when I'm done.
>
If you are going to try LVM, I strongly recommend that you download the latest
LVM code from RedHat and recompile it for your
system...
http://sources.redhat.com/dm/
http://sourceware.org/lvm2/
As you say, there have been lockup problems with LVM snapshots in the past, but
these have been fixed in the recent releases. We
are running Xen-3.0.2-2 on this server with the following:
root@hydra:~# uname -a
Linux hydra 2.6.16-xen #1 SMP Thu Apr 13 18:46:07 BST 2006 i686 GNU/Linux
root@hydra:~# lvm version
LVM version: 2.02.07 (2006-07-17)
Library version: 1.02.08 (2006-07-17)
Driver version: 4.5.0
root@hydra:~#
So far, no LVM or Xen problems at all with an uptime of several months. We use
LVM snapshots daily both within the Dom-0 and also
within the Dom-Us (which use LVM on top of the VBDs) to take backups.
BR,
Roger
Thanks Roger, good to have confirmation that this does indeed work as
expected! It seems like the best solution, once we've completed our
tests I'll start the tedious process of migrating all our domU's to
LVM backends... Sigh
--
Kenneth Kalmer
kenneth.kalmer@xxxxxxxxx
Folding@home stats
http://fah-web.stanford.edu/cgi-bin/main.py?qtype=userpage&username=kenneth%2Ekalmer
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