From owner-freebsd-current@FreeBSD.ORG Thu May 26 13:54:56 2005 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4C4F016A438 for ; Thu, 26 May 2005 13:54:56 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from mh1.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 01FE643D1D for ; Thu, 26 May 2005 13:54:54 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [10.177.171.220] (neutrino.centtech.com [10.177.171.220]) by mh1.centtech.com (8.13.1/8.13.1) with ESMTP id j4QDsr4B077630 for ; Thu, 26 May 2005 08:54:53 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <4295D51F.50106@centtech.com> Date: Thu, 26 May 2005 08:54:39 -0500 From: Eric Anderson User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.7) Gecko/20050504 X-Accept-Language: en-us, en MIME-Version: 1.0 To: FreeBSD Current Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.82/894/Wed May 25 07:53:16 2005 on mh1.centtech.com X-Virus-Status: Clean Subject: Disable read/write caching to disk? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 May 2005 13:54:56 -0000 Is it possible to disable all read and write caching to a disk? I'm playing with the ever so dangerous multiple hosts mounting (rw and/or ro) the same filesystem over fiber channel. Also - what exactly are the issues with forcing an unclean filesystem to mount rw? I know you could (will?) have data corruption, but on which data? Only data that has not been synced to disk? Any random amount of data? Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------