From owner-freebsd-stable@FreeBSD.ORG Wed May 5 13:24:34 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id F0340106564A for ; Wed, 5 May 2010 13:24:34 +0000 (UTC) (envelope-from kamikaze@bsdforen.de) Received: from mail.bsdforen.de (bsdforen.de [212.204.60.79]) by mx1.freebsd.org (Postfix) with ESMTP id B28398FC12 for ; Wed, 5 May 2010 13:24:34 +0000 (UTC) Received: from mobileKamikaze.norad (vpn-cl-162-131.rz.uni-karlsruhe.de [141.3.162.131]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.bsdforen.de (Postfix) with ESMTP id 406F98A1C07 for ; Wed, 5 May 2010 15:24:33 +0200 (CEST) Message-ID: <4BE17191.6040305@bsdforen.de> Date: Wed, 05 May 2010 15:24:33 +0200 From: Dominic Fandrey User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-GB; rv:1.9.1.9) Gecko/20100331 Thunderbird/3.0.4 MIME-Version: 1.0 To: freebsd-stable@freebsd.org X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: geom_sched influence on SU consistency X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 May 2010 13:24:35 -0000 I'm wondering how geom_sched influences soft-update consistency. To my understanding it's very important to SU, that the file system controls writing sequences. Because geom_sched is transparent, i.e. UFS does not know about access scheduling, I'm afraid that the use of geom_sched would endanger my file system consistency in case of a crash. Can anyone put my fears to rest or confirm them? -- A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?