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xen-users
Re: [Xen-users] FAQ: How to backup for recovery?
Hi Julian,
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 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.
How do you know if the backup mounts? Do you just try it and
see what happens?
Yes, mount returns useful error codes when trying. In your shell-script
you can easily case the error codes and decide what to do.
(I'm wondering how an automated system will 'try it later')
I currently only echo a warning, so I'll see the error in the log the
cronjob is mailing me. 'try it later' means, that I skip the domU at
this run. Because I do 4 runs a day, it wouldn't be that bad. But - as I
wrote above - it always recovered successfully since installation of the
script.
cu cp
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