From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id D8FB91381F3 for ; Fri, 21 Jun 2013 18:53:45 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id AA946E0B08; Fri, 21 Jun 2013 18:53:35 +0000 (UTC) Received: from relay.sgi.com (relay3.sgi.com [192.48.152.1]) by pigeon.gentoo.org (Postfix) with ESMTP id DA3CEE0B01 for ; Fri, 21 Jun 2013 18:53:34 +0000 (UTC) Received: from conejo.engr.sgi.com (unknown [10.202.12.106]) by relay3.corp.sgi.com (Postfix) with ESMTP id 11EC3AC003 for ; Fri, 21 Jun 2013 11:53:34 -0700 (PDT) Received: from sgi.com (conejo.engr.sgi.com [10.202.12.106]) by conejo.engr.sgi.com (Postfix) with ESMTP id CB76161E876A for ; Fri, 21 Jun 2013 11:53:33 -0700 (PDT) Date: Fri, 21 Jun 2013 11:53:33 -0700 From: Bob Sanders To: gentoo-amd64@lists.gentoo.org Subject: Re: [gentoo-amd64] Re: Is my RAID performance bad possibly due to starting sector value? Message-ID: <20130621185333.GD11236@sgi.com> Mail-Followup-To: gentoo-amd64@lists.gentoo.org References: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@lists.gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Organization: SGI, Fremont, California, U.S.A. User-Agent: Mutt/1.5.21 (2010-09-15) X-Archives-Salt: 3e498d5e-8eb4-41e1-bf7d-21ae38ffc2e4 X-Archives-Hash: b5a920ca827f5b852e570407efe9d9dd Mark Knecht, mused, then expounded: > > > I agree that RAID5 gives you an opportunity to get things fixed, but > there are folks who lose a disk in a RAID5, start the rebuild, and > then lose a second disk during the rebuild. That was my main reason to > go to RAID6. Not that I would ever run the array degraded but that I > could still tolerate a second loss while the rebuild was happening and > hopefully get by. That was similar to my old 3-disk RAID1 where I'd > have to lose all 3 disks to be out of business. > If the drives in the RAID came from the same build lot, the chances of multi-drive failure are fairly high, if one fails. I've had 3 out of four drives, from the same lot build, fail at the same time. I've had others never fail. And a few that fail over time where others from the same lot failed within a month of the first failure. Bob -- -