[OpenAFS] Re: Current OpenAFS Backup Recommendations

Holger Rauch holger.rauch@empic.de
Mon, 21 Dec 2009 10:17:38 +0100

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Hi Adam,

do you have any scripts available that you'd be willing to/allowed to
share? I'd highly appreciate that.

To all list members: Even though I didn't ask for it initially, are
there any good tutorials for using both OpenAFS's backup cmd as well
as vos dump/vos restore?

Thanks in advance for any info!

Kind regards,


On Sat, 19 Dec 2009, Adam Megacz wrote:

> Russ Allbery <rra@stanford.edu> writes:
> >> You can get remarkably good compression by using xdelta3 on dump
> >> files.
> > Don't you have to do full dumps in order to calculate the xdelta3
> > differences?
> I pipe the output of "vos dump" directly to xdelta3, so the full dump
> never hits the disk.  If you perform the dump and diff on the
> fileserver itself, then the network traffic is also proportional to
> the size of the diff (rather than the size of the whole dump).  You
> can then send the diff over the network to secondary storage.
> Secondary storage needs to keep a copy of the full dump and reapply
> the diff, so the amount of effort is proportional to the size of the
> dump, but the network traffic is proportional to the diff.
> It takes a few tries to set it up, but works really smoothly once
> you've got it going.  IMHO it's the best incremental backup solution
> for AFS that doesn't involve the risk of your proprietary software
> suddenly becoming unsupported.
> The ideal situation would be to have the volserver emit an RFC3284
> file directly using its knowledge of which file blocks have changed
> since a given date.  This would give you block-granularity incremental
> dumps instead of the file-granularity dumps without inventing a new
> dump format; just use an RFC3284-of-dumpfiles.
>   - a
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Holger Rauch
Entwicklung Anwendungs-Software
Systemadministration UNIX

Tel.: +49 / 9131 / 877 - 141
Fax: +49 / 9131 / 877 - 266
Email: Holger.Rauch@empic.de

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