Date: Sat, 14 Jun 1997 15:10:20 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: rb@gid.co.uk (Bob Bishop) Cc: terry@lambert.org, freebsd-hackers@FreeBSD.ORG Subject: Re: dump/restore with compression, roberto@keltia.freenix.fr Message-ID: <199706142210.PAA14694@phaeton.artisoft.com> In-Reply-To: <l0302090eafc73c3cff85@[194.32.164.2]> from "Bob Bishop" at Jun 13, 97 07:09:27 pm
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> >> I'd never use any compression -- except hardware-based like DAT's -- > >> because you can't recover much if your tape have a problem... I'm against > >> compressed file systems for that very reason too. [ ... block compression ... ] > You still get the phenomenon that I usually describe as 'uncompressing the > error' - your physical block contains more information when it's > compressed, so you lose more than in the uncompressed case even if you can > recover. Yes, but the error doesn't damage the entire filesystem or tape archive. You've lost the file either way if you have a media error, and spamming 2 blocks (assuming 50% compressed size) is not that much worse than spamming 1. If you were really paranoid about a particular files contents, such that one more block would "save your life", you would use rotating backups and an off-site fire-safe anyway. 8-). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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