From owner-freebsd-questions@FreeBSD.ORG Sun Mar 12 21:52:17 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 93FB516A405 for ; Sun, 12 Mar 2006 21:52:17 +0000 (GMT) (envelope-from pbowen@fastmail.fm) Received: from out4.smtp.messagingengine.com (out4.smtp.messagingengine.com [66.111.4.28]) by mx1.FreeBSD.org (Postfix) with ESMTP id 95A3743D55 for ; Sun, 12 Mar 2006 21:52:14 +0000 (GMT) (envelope-from pbowen@fastmail.fm) Received: from frontend1.internal (mysql-sessions.internal [10.202.2.149]) by frontend1.messagingengine.com (Postfix) with ESMTP id 5DBA6D3EA8A for ; Sun, 12 Mar 2006 16:52:13 -0500 (EST) Received: from frontend2.messagingengine.com ([10.202.2.151]) by frontend1.internal (MEProxy); Sun, 12 Mar 2006 16:52:13 -0500 X-Sasl-enc: 4u9jCD6ItkHFvGF7r9eeLRLbETOW6tnK3Kl8Ho4/NZSz 1142200330 Received: from [192.168.1.233] (unknown [205.246.14.226]) by frontend2.messagingengine.com (Postfix) with ESMTP id 66C1758BF56 for ; Sun, 12 Mar 2006 16:52:08 -0500 (EST) Message-ID: <44149803.5070803@fastmail.fm> Date: Sun, 12 Mar 2006 15:52:03 -0600 From: Patrick Bowen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050920 X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <44137F59.5030800@fastmail.fm> <44142CB2.4030904@mac.com> In-Reply-To: <44142CB2.4030904@mac.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: gmirror on a laptop. X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 12 Mar 2006 21:52:17 -0000 Chuck Swiger wrote: >Patrick Bowen wrote: > > >>I wanted to fiddle around with gmirror(8) on a Dell C-600 Laptop. It has >>a 2-slice, 20 Gig HD, and I essentially wanted to mirror ad0s1 to ad0s2. >>I realize this will put the HD under stress, but otherwise it seems >>do-able. >> >>What I want to know is whether this is such an incredibly bad idea I >>shouldn't even consider it --or-- it seems like a good way to get >>familiar with gmirror, so go for it. >> >> > >If you want to do this for the sake of practice, by all means, feel free. > >However, mirroring onto the same device is going to result in almost no benefit >to reliability and will cause a very large performance hit, as well as reducing >the usable amount of disk space in half. (In other words, actually leaving the >machine set up that way would be an incredibly bad idea.) > > > Mr. Swiger; I agree, except that I had anticipated absolutely *no* benefit to reliability. If the disk goes bad, then having a mirror on the same disk, different slice, would still give me...no disk. I simply wanted to get the practice by actually doing, instead of just reading about it. I'll probably re-install Slackware on the other slice when I get done playing around. Thanks, Patrick