From owner-freebsd-current@FreeBSD.ORG Fri May 27 03:53:52 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 4883B16A41C for ; Fri, 27 May 2005 03:53:52 +0000 (GMT) (envelope-from scottl@samsco.org) Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57]) by mx1.FreeBSD.org (Postfix) with ESMTP id AFC0F43D1F for ; Fri, 27 May 2005 03:53:49 +0000 (GMT) (envelope-from scottl@samsco.org) Received: from [192.168.254.14] (imini.samsco.home [192.168.254.14]) (authenticated bits=0) by pooker.samsco.org (8.13.3/8.13.3) with ESMTP id j4R3thRJ046797; Thu, 26 May 2005 21:55:43 -0600 (MDT) (envelope-from scottl@samsco.org) Message-ID: <4296997C.9030700@samsco.org> Date: Thu, 26 May 2005 21:52:28 -0600 From: Scott Long User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.7) Gecko/20050416 X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Chad Leigh -- Shire.Net LLC" References: <4295D51F.50106@centtech.com> <429606D9.6080602@cs.tu-berlin.de> <42960ACB.7090801@cs.tu-berlin.de> <42960CFE.4060307@centtech.com> <42960F8F.2050109@samsco.org> <42961195.30608@centtech.com> <429613FB.80100@samsco.org> <42968AD4.3020603@centtech.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.8 required=3.8 tests=ALL_TRUSTED autolearn=failed version=3.0.2 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on pooker.samsco.org Cc: FreeBSD Current , Eric Anderson Subject: Re: 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: Fri, 27 May 2005 03:53:52 -0000 Chad Leigh -- Shire.Net LLC wrote: > > On May 26, 2005, at 8:49 PM, Eric Anderson wrote: > >> >> So it sounds dangerous, but not disastrous.. Sounds like soft- >> updates would help this alot, so I'll turn them back on for this >> filesystem (I typically do use it). >> >> At a minimum, it would be awesome to even have a way to do one host >> rw and several doing ro. Think of the case of a web server farm, >> where it's nearly all reads. >> >> Thanks for the details and information! > > > > use NFS or something. Not ideal but it allows you to have lots of > clients using the same space without the disasters. > > Chad > NFS and Coda/AFS require that you have an intelligent node, i.e. a computer, in front of each disk. The whole idea of a Fibre Channel or iSCSI SAN is that you have a network of disks connected to a network of computers, all able to communicate with each other and not have to be fronted by a computer. This is quite important for high-availability storage networks that want the reliability and scalability of not having a single computer be the choke point or single-point-of-failure for a particular set of data. Granted it's still somewhat of a niche, but as persistent storage and data mining become more part of the mainstream, it'll start becoming very important. Right now FreeBSD simply isn't an option, while Solaris, NT, and Linux are. Scott