From owner-cvs-src@FreeBSD.ORG Thu Aug 19 06:52:00 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0B24516A4CE; Thu, 19 Aug 2004 06:52:00 +0000 (GMT) Received: from ozlabs.org (ozlabs.org [203.10.76.45]) by mx1.FreeBSD.org (Postfix) with ESMTP id 920E243D1D; Thu, 19 Aug 2004 06:51:59 +0000 (GMT) (envelope-from grog@lemis.com) Received: from blackwater.lemis.com (blackwater.lemis.com [192.109.197.80]) by ozlabs.org (Postfix) with ESMTP id B3DD72BDFE; Thu, 19 Aug 2004 16:51:57 +1000 (EST) Received: by blackwater.lemis.com (Postfix, from userid 1004) id B7735511FA; Thu, 19 Aug 2004 16:21:55 +0930 (CST) Date: Thu, 19 Aug 2004 16:21:55 +0930 From: Greg 'groggy' Lehey To: John-Mark Gurney Message-ID: <20040819065155.GR85432@wantadilla.lemis.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> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="wc6dtGz1CZgs+5WP" Content-Disposition: inline In-Reply-To: <20040819064401.GN99980@funkthat.com> User-Agent: Mutt/1.4.1i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 cc: Scott Long cc: src-committers@FreeBSD.org cc: Pawel Jakub Dawidek cc: cvs-src@FreeBSD.org cc: cvs-all@FreeBSD.org cc: Poul-Henning Kamp cc: Wilko Bulte Subject: Re: RAID-3? X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Aug 2004 06:52:00 -0000 --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--