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SubjectRe: bkbits.net is down
LTO drives are probably a lot more expensive then the entire computers he
is useing as a backup (one source listed the individual drives at ~$10K,
I'll bet Larry's backup systems are under $5K probably under 3K)

David Lang

On 27 Jun
2003, Joshua Penix wrote:

> Date: 27 Jun 2003 21:08:06 -0700
> From: Joshua Penix <jpenix@binarytribe.com>
> To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
> Subject: Re: bkbits.net is down
>
> On Fri, 2003-06-27 at 20:19, Larry McVoy wrote:
> > On Fri, Jun 27, 2003 at 08:51:40PM -0400, Scott McDermott wrote:
> > > Larry McVoy on Fri 27/06 17:16 -0700:
> > > > I don't know if you all realize this but at one point we
> > > > had corrupted data in several repositories and the backups
> > > > were also shot.
> > >
> > > ever hear of tapes?
> >
> > bkbits is 45GB of data and growing. Tapes are completely impractical,
> > that's why we have hot spares.
>
> Boy you do need a good admin :) Done correctly, tapes are quite
> practical for that amount of data. A LTO or SDLT drive would back the
> entire 45GB thing up on a single tape, with room for at least one to two
> more full backups. Granted, you're not going to have tape act as your
> hot backup, but it is a good third line of defense. Plus data backed up
> to tape is immune from human or software error that may otherwise affect
> the hard-drive based data.
>
> 45GB of code is very compressible and I'm sure good chunks of that don't
> change on a weekly basis. I'd imagine you could get a weekly or
> bi-weekly full backup to tape in the span of about two hours, and then
> do nightly differentials which would probably be only 15 minutes in
> length. A filesystem capable of doing snapshots would ensure
> consistency of the repositories on tape and would prevent you from
> having to shutdown bkbits while backing up.
>
> --Josh
>
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