[Babase] Papio Information
Susan Alberts
alberts at duke.edu
Wed Jun 10 20:32:45 EDT 2009
Thanks Karl and Ryan,
>
> The one important take-away point that differs from the previously
> explained backup plan is that backups are put into the backup system
> only every other day. We do keep the prior days backup, for 1 day
> only, on disk on papio until it's overwritten by the next days backup.
> So, in case of disaster we could lose 2 days of work.
For clarification, do you mean that the incrementals that Ryan talked
about are kept for only 24 hours? I didn't understand "We do keep the
prior days backup, for 1 day only..." But, this refers to a backup on
papio, and I think the incrementals that Ryan is talking about are on
a backup server. So, I think what Karl is saying is that in addition,
to Diffs, Fulls and Incrementals, we do a backup ourselves onto Papio
but only keep it for 24 hours. So if an incremental is done Monday at
4 am (or whatever), and the server crashes catastrophically on Weds at
3 am, there is a chance that we've lost all changes from Monday 4
onwards, because any backup we made on Papio might have been taken at,
say, Monday 10 pm and not kept past Tuesday 10 pm. Right? But then,
wouldn't there be a papio backup taken at 10 pm Tuesday?
Sorry if I'm not getting soemthing obvious.
>
>
> Ryan, the only thing I can think of that might go wrong is if
> the database backup is being written at the same time that
> the backup is done to tape. This would leave us with an
> incomplete backup on every tape.
I don't get this.
Susan
> (It would also be good if
> the database backup to /disk completed before, rather than after,
> the backup to tape so there's not another day of lag introduced.)
>
> Just thought it's worth mentioning the above just in case.
>
> Karl <kop at meme.com>
> Free Software: "You don't pay back, you pay forward."
> -- Robert A. Heinlein
>
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--------------------------------------------------------
Susan Alberts, Dept of Biology, Duke University, Box 90338, Durham NC
27708, 919-660-7272 (Ph), 919-660-7293 (Fax)
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