Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030401AbWARQrR (ORCPT ); Wed, 18 Jan 2006 11:47:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030403AbWARQrR (ORCPT ); Wed, 18 Jan 2006 11:47:17 -0500 Received: from khc.piap.pl ([195.187.100.11]:58125 "EHLO khc.piap.pl") by vger.kernel.org with ESMTP id S1030401AbWARQrQ (ORCPT ); Wed, 18 Jan 2006 11:47:16 -0500 To: Phillip Susi Cc: Michael Loftis , linux-kernel@vger.kernel.org Subject: Re: FYI: RAID5 unusably unstable through 2.6.14 References: <43CD8A19.3010100@cfl.rr.com> <7A7A0F7F294BB08D7CDA264C@d216-220-25-20.dynip.modwest.com> <43CDA3B0.2030503@cfl.rr.com> From: Krzysztof Halasa Date: Wed, 18 Jan 2006 17:47:08 +0100 In-Reply-To: <43CDA3B0.2030503@cfl.rr.com> (Phillip Susi's message of "Tue, 17 Jan 2006 21:10:56 -0500") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 734 Lines: 17 Phillip Susi writes: > but only slightly so, and in any case, a 3 disk raid-5 is FAR more > reliable than a single drive, and only slightly less reliable than a > two disk raid-1 ( though you get 3x the space for only 50% higher > cost, so 6x cheaper cost per byte of storage ). Actually with 3-disk RAID5 you get 2x the space of RAID1 for 1.5 x cost, so the factor is 1.5/2 = 0.75, i.e., you save only 25% on RAID5 or RAID1 is 33% more expensive. -- Krzysztof Halasa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/