From owner-freebsd-questions@FreeBSD.ORG Sun Mar 12 14:14:16 2006 Return-Path: X-Original-To: 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 0FE4D16A402 for ; Sun, 12 Mar 2006 14:14:15 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from pi.codefab.com (pi.codefab.com [199.103.21.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id AC6EB43D4C for ; Sun, 12 Mar 2006 14:14:14 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from localhost (localhost [127.0.0.1]) by pi.codefab.com (Postfix) with ESMTP id E4F605CFC; Sun, 12 Mar 2006 09:14:09 -0500 (EST) Received: from pi.codefab.com ([127.0.0.1]) by localhost (pi.codefab.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 94387-01; Sun, 12 Mar 2006 09:14:09 -0500 (EST) Received: from [192.168.1.3] (pool-68-161-129-91.ny325.east.verizon.net [68.161.129.91]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pi.codefab.com (Postfix) with ESMTP id EF6815C27; Sun, 12 Mar 2006 09:14:08 -0500 (EST) Message-ID: <44142CB2.4030904@mac.com> Date: Sun, 12 Mar 2006 09:14:10 -0500 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: Patrick Bowen References: <44137F59.5030800@fastmail.fm> In-Reply-To: <44137F59.5030800@fastmail.fm> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: amavisd-new at codefab.com Cc: questions@freebsd.org 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 14:14:16 -0000 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.) -- -Chuck