Re: [SLUG] Re: pseudo block device piping to smb or nfs -- MO = { CD-RW, DVD-RW, DVD+RW, etc... }

From: Bryan J. Smith (b.j.smith@ieee.org)
Date: Fri Sep 10 2004 - 14:29:01 EDT

On Fri, 2004-09-10 at 14:12, Eben King wrote:
> OK, how about an archiver with ECC? Enhanced tar? Checksum for each
> file/block/MB?

Checksum only tells you when a file is bad. If you gzip an archive,
like tar does, then you're toast.

I guess you could use something like PAR, but why use an unreliable
format?

Stick with either tape, RRD (removable rigid disk), WORM (CD-R, DVD-R)
or MO w/verify (DVD-RAM).

> Well, some number of errors inherently (30-40 if 1E9b, 4-5 if 1E9B), PLUS
> scratches, manufacturing defects, cosmic rays while reading, etc.

Well, MO is far more immune to environment than even WORM. There is a
clear plastic cover over the actual MO media. DVD-RAM takes it one step
further by offering a cartridge option (but not required).

> Sure. But the odds are you'll have _some_.

Yep. 

-- 
     Linux Enthusiasts call me anti-Linux.
   Windows Enthusisats call me anti-Microsoft.
 They both must be correct because I have over a
decade of experience with both in mission critical
environments, resulting in a bigotry dedicated to
 mitigating risk and focusing on technologies ...
           not products or vendors
--------------------------------------------------
Bryan J. Smith, E.I.         b.j.smith at ieee.org

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