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xen-users
Re: [Xen-users] FAQ: How to backup for recovery?
On 11 Oct 2006 at 22:53, Christoph Purrucker wrote:
> Hi Javier,
>
> >> I'm using LVM for DomUs: On backup time, I create a LVM snapshot, mount
> >> the snapshot in Dom0 and running rdiff-backup to create a new increment.
> >
> > i guess that if the snapshot is done while the DomU is running, mounting
> > the
> > snapshot would find it as 'not cleanly unmounted' and might require an
> > fsck.
> > have you encountered this issue?
>
> of course, the filesystem was not cleanly unmounted. But as long as you
> use a journaling filesystem, the log run on mount time will correct
...and XEN preserves write ordering...
> nearly all errors: If you can mount the snapshot, if will be consistent.
> If the DomU did some wired things during snapshot, and the journal will
> not help to recover, I'd skip the backup and try it later. I'm doing
> such backups with several ext3 and one xfs (a cyrus partition with lots
> of files), and the snapshots always were mountable after journal recovery.
...mountable does not mean all the data is still tehre, however...
Ulrich
>
> cu cp
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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