Date: Thu, 19 Aug 2004 16:21:55 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Wilko Bulte <wb@freebie.xs4all.nl> Subject: Re: RAID-3? Message-ID: <20040819065155.GR85432@wantadilla.lemis.com> In-Reply-To: <20040819064401.GN99980@funkthat.com> References: <20040817074633.GO30151@darkness.comp.waw.pl> <20040817112900.GA31635@freebie.xs4all.nl> <20040817124020.GK88156@wantadilla.lemis.com> <20040817131612.GT30151@darkness.comp.waw.pl> <20040819024359.GA85432@wantadilla.lemis.com> <41244217.6010102@samsco.org> <20040819062228.GO85432@wantadilla.lemis.com> <20040819062848.GM99980@funkthat.com> <20040819063843.GP85432@wantadilla.lemis.com> <20040819064401.GN99980@funkthat.com>
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--wc6dtGz1CZgs+5WP Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wednesday, 18 August 2004 at 23:44:01 -0700, John-Mark Gurney wrote: > I originaly was working on a RAID-3 module (which is possibly where > pjd got his idea) that used Luigi's FEC code. The advantage of this > code was the fact that you could have n parity disks beyond the m > data disks. The advantage of this was that you could loose any n > disks, and your data is still recoverable. Unlike with RAID-4/5 > implementations where if you happen to loose a second disk (due to a > power surge or something) while rebuilding, you'd be SOL. That type > of redundancy is good thing to have. I can see that as a great advantage, but it's not part of the RAID-3 definition, and I can't see why you couldn't expand RAID-5 in a similar manner. Am I missing something? Greg -- Note: I discard all HTML mail unseen. Finger grog@FreeBSD.org for PGP public key. See complete headers for address and phone numbers. --wc6dtGz1CZgs+5WP Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQFBJE4LIubykFB6QiMRAh1NAJ45Vz6mAn0K4O8ix7IkJf3SE1tktgCfcyNX P9LljOAhMs9dNOriD+hocDA= =YYuu -----END PGP SIGNATURE----- --wc6dtGz1CZgs+5WP--
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