Date: Wed, 18 Jun 1997 18:29:55 -0700 (PDT) From: "Jonathan M. Bresler" <jmb> To: ahd@kew.com (Drew Derbyshire) Cc: freebsd-hackers@FreeBSD.ORG, jmb@FreeBSD.ORG, brandon@ice.cold.org, freebsd-questions@FreeBSD.ORG, nate@mt.sri.com Subject: Re: dump/restore with compression Message-ID: <199706190129.SAA24820@hub.freebsd.org> In-Reply-To: <199706190058.UAA05638@pandora.hh.kew.com> from "Drew Derbyshire" at Jun 18, 97 08:58:43 pm
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Drew Derbyshire wrote: > > > ps. dont use compression. if the data is valuable enough to backup > > its valuable enough to backup reliably. > > This implies compression is not reliable. I can't say much for > UNIX backups, but in general I've never had hardware or software > compression screw up worse than any other hardware/software > combination. the danger with compression is that a single bit error can destory the entire backup. (note the _can_ it does not have to be this way. block compression in place of streaming compression may not fail catastrophicly. > I believe in compression because it encourages backups by reducing > the media needed, cutting both media cost and time spent swapping > volumes. Less media per megabyte up also reduces the chances of > an I/O error on media, so compressed backups can be more reliable > than uncompressed. get a tape backup device that can store everything. you dont have to do a level 0 every night ;) > > Like anything to do with backups, test and then test again. Amen brother!
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