From owner-freebsd-questions@FreeBSD.ORG Sat Jul 20 19:12:24 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 6264BE38 for ; Sat, 20 Jul 2013 19:12:24 +0000 (UTC) (envelope-from steve@sohara.org) Received: from uk1rly2283.eechost.net (relay01a.mail.uk1.eechost.net [217.69.40.75]) by mx1.freebsd.org (Postfix) with ESMTP id 2A6DCC5 for ; Sat, 20 Jul 2013 19:12:23 +0000 (UTC) Received: from [31.186.37.179] (helo=smtp.marelmo.com) by uk1rly2283.eechost.net with esmtpa (Exim 4.72) (envelope-from ) id 1V0cZ5-0000YD-JY; Sat, 20 Jul 2013 20:11:35 +0100 Received: from [192.168.63.1] (helo=steve.marelmo.com) by smtp.marelmo.com with smtp (Exim 4.80.1 (FreeBSD)) (envelope-from ) id 1V0cZj-000EY1-8F; Sat, 20 Jul 2013 19:12:15 +0000 Date: Sat, 20 Jul 2013 20:12:14 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: to gmirror or to ZFS Message-Id: <20130720201214.90206565e00675611996176d@sohara.org> In-Reply-To: <51EAC56C.4030801@fjl.co.uk> References: <4DFBC539-3CCC-4B9B-AB62-7BB846F18530@gmail.com> <976836C5-F790-4D55-A80C-5944E8BC2575@gmail.com> <51E51558.50302@ShaneWare.Biz> <51E52190.7020008@fjl.co.uk> <6CE5718E-2646-4D8C-AF98-37384B8851C5@mac.com> <51EAC56C.4030801@fjl.co.uk> X-Mailer: Sylpheed 3.3.0 (GTK+ 2.24.19; amd64-portbld-freebsd9.1) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Auth-Info: 15567@permanet.ie (plain) Cc: frank2@fjl.co.uk X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Jul 2013 19:12:24 -0000 On Sat, 20 Jul 2013 18:14:20 +0100 Frank Leonhardt wrote: > It's worth noting, as a warning for anyone who hasn't been there, that > the number of times a second drive in a RAID system fails during a > rebuild is higher than would be expected. During a rebuild the remaining > drives get thrashed, hot, and if they're on the edge, that's when > they're going to go. And at the most inconvenient time. Okay - obvious > when you think about it, but this tends to be too late. Having the cabinet stuffed full of nominally identical drives bought at the same time from the same supplier tends to add to the probability that more than one drive is on the edge when one goes. It's a pity there are now only two manufacturers of spinning rust. -- Steve O'Hara-Smith