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[filmscanners] Re: keeping the 16bit scans (bad RAID experience)



Hi!

I just want to mention that we had quite a few problems with raid at my work.
We have lost a significant amount of files due to corruption of files on both
mirrored RAID-servers we had. Fortunately we did have backup on tape media
too.

A cheaper option may be to have a couple IDE disks in removable mounting
frames, I use DK-3 from Computer Cable. My idea is that I have two disks let
say A and B, and I just exchange them time to time.

Being a lazy Linux using amateur I'm not really putting a lot of effort in the
backup.

1) I have all files I'm working with on a central server running all the time.
The server itself is minimal, and totally silent (a 400-500 USD box).

2) I have two disks, one sitting in the computer, and one in a drawer (should
of course be in a firesafe vault at another location :-)

3) I have a crontab entry on my computer which is run around 20:00 each
evening. Doing the following:
- mount the disk (so that the operating system can access it)
- update all files using rsync (http://rsync.samba.org) see also:
http://everythingsolaris.org/articles/atour/index.html
- unmount the disk
- set spindown time to 5 minutes (so it is not spinning)

4) I exchange the disks now and than.

This is in no way fool prof, of course. If any of the files is corrupted it
still would be migrated to the other hard disk. This kind of problem could be
handled by calculating and checking checksums, but that kind of handling
needs a bit more work.

Notes:

1) The server is not really needed for the backup, i need it for other
reasons, but it is nice to have files and backup on different hardware.

2) Most Linux stuff is available using Cygwin on Windows.

3) Mac OS X users: http://www.bombich.com/mactips/rsync.html


Best regards

Erik
fredagen den 28 mars 2003 21.27 skrev du:
> >CDs are too much hassle. Two mirrored removable external drives will be
> > my next step, but I want to wait as long as possible.
> >
> :-)  I do not know specifically about mirrored removable drives; but I
>
> do know that the use of mirrored drives in a RAID array may not
> necessarily be any more hassle-free than the use of CDs.  A mirrored
> RAID array even with portable removable drives would probable require
> that the be read using the same RAID array configurationm card, and
> software as was used to write them.  RAID arrays are often not always
> interchangeable from one to another, which could result in your backup
> mirrored disk being rendered useless should the RAID card or software
> fail or be replaced with a different one ( either brand or version).  It
> happened to me, which made me question the viability and usefulness of
> mirrored drives.
>
> If you are speaking primarily of a non RAID array where the mirrored
> drives are achieved by copying files from one hard drive to another
> manually, I fail to see how that is less hassle than burning CDs.  But
> in the end it is your decision; I just think that you should investigate
> and think out in more detail your plans to use mirrored removable drives
> before discarding the notion of using CDs.
>
> filmscanners_owner@halftone.co.uk <> wrote:
> > Thankyou all for your replies!
> >
> > I hadn't thought about the need for a crop, so that's one good reason
> > to keep 16bit files. And with J2K space is less of an issue. I wish
> > DVD had sorted out its act but right now, that's not an option. CDs
> > are too much hassle. Two mirrored removable external drives will be
> > my next step, but I want to wait as long as possible.  I think, from
> > what I'm hearing, that I will play it safe and keep the big guys for
> > now. I'm sure in most cases, the differences will not be noticeable,
> > but 16bit just *feels* better. :-)
> >
> > Ed Verkaik
>
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--
Erik Kaffehr                erik.kaffehr@swipnet.se alt. ekr@ksu.se
Mariebergsvgen 53          +46 155 219338 (home)
S-611 66 Nykping           +46 155 263515 (office)
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