Re: [Xen-users] FAQ: How to backup for recovery?

[Christoph Purrucker <cp+ml-xen@xxxxxxxx>]

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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