From owner-freebsd-stable@FreeBSD.ORG Wed Nov 24 09:53:13 2004 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9EB0616A4CE for ; Wed, 24 Nov 2004 09:53:13 +0000 (GMT) Received: from anduin.net (anduin.net [212.12.46.226]) by mx1.FreeBSD.org (Postfix) with ESMTP id 40D4043D49 for ; Wed, 24 Nov 2004 09:53:13 +0000 (GMT) (envelope-from ltning@anduin.net) Received: from mailnull by anduin.net with dspam-scanned (Exim 4.43 (FreeBSD)) id 1CWtmU-0000tw-J8 for stable@freebsd.org; Wed, 24 Nov 2004 10:49:46 +0100 Received: from mailnull by anduin.net with spamassassin-scanned (Exim 4.43 (FreeBSD)) id 1CWtmR-0000tp-Hk for stable@freebsd.org; Wed, 24 Nov 2004 10:49:46 +0100 Received: from eirik.unicore.no ([213.225.74.166] helo=[10.0.16.10]) by anduin.net with esmtp (Exim 4.43 (FreeBSD)) id 1CWtmR-0000tm-Dc for stable@freebsd.org; Wed, 24 Nov 2004 10:49:43 +0100 Message-ID: <41A45A3F.5010008@anduin.net> Date: Wed, 24 Nov 2004 10:54:07 +0100 From: =?ISO-8859-1?Q?Eirik_=D8verby?= User-Agent: Mozilla Thunderbird 0.8 (X11/20041021) X-Accept-Language: en-us, en MIME-Version: 1.0 To: stable@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.64 (2004-01-11) on anduin.net X-Spam-Level: X-Spam-Status: No, hits=-4.7 required=7.5 tests=AWL,BAYES_00 autolearn=ham version=2.64 Subject: graid3 - requirements or manpage wrong? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Nov 2004 09:53:13 -0000 Hi, to the best of my ability I have been investigating the 'real' requirements of a raid-3 array, and cannot see that the following text from graid3(8) cannot possibly be correct - and if it is, then the implementation must be wrong or incomplete (emphasis added): label Create a RAID3 device. The last given component will contain parity data, all the rest - regular data. ***Number of compo- nents has to be equal to 3, 5, 9, 17, etc. (2^n + 1).*** I might be wrong, but I cannot see how a raid-3 array should require (2^n + 1) drives - I am fairly certain I have seen raid-3 arrays consisting of four drives, for example. This is also what I had hoped to accomplish. Anyone care to shed a light on this? I'd prefer to use graid3 (or 5, if there was one) instead of gvinum.. Thanks, /Eirik