From owner-freebsd-cluster Tue Dec 10 1: 2:55 2002 Delivered-To: freebsd-cluster@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3944737B401 for ; Tue, 10 Dec 2002 01:02:54 -0800 (PST) Received: from gate.nentec.de (gate2.nentec.de [194.25.215.66]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0851843E4A for ; Tue, 10 Dec 2002 01:02:53 -0800 (PST) (envelope-from sporner@nentec.de) Received: from nenny.nentec.de (root@nenny.nentec.de [153.92.64.1]) by gate.nentec.de (8.11.3/8.9.3) with ESMTP id gBA92oP24997 for ; Tue, 10 Dec 2002 10:02:50 +0100 Received: from nentec.de (andromeda.nentec.de [153.92.64.34]) by nenny.nentec.de (8.11.3/8.11.3) with ESMTP id gBA92jt14237 for ; Tue, 10 Dec 2002 10:02:45 +0100 Message-ID: <3DF5ADB5.9060908@nentec.de> Date: Tue, 10 Dec 2002 10:02:45 +0100 From: Andy Sporner User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2a) Gecko/20020910 X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-cluster Subject: Re: sharing fules within a cluster References: <200212100854.gBA8s6508847@splat.grant.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by AMaViS-perl11-milter (http://amavis.org/) Sender: owner-freebsd-cluster@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Michael Grant wrote: >Rouzer, Charles A (Chuck) wrote: > > >> Shared SCSI would probably be the way to go in this situation. iSCSI >>(not sure of driver status) and vinum should enable software RAID mirroring >>of file systems over a network providing you fail-over capabilities without >>shared SCSI. >> >> > >I emailed the author of vinum, Greg Lehey, a few weeks about about >this. He says that there are problems with this due to caching: > > > >Not really. The problem is that each system caches disk data locally, >and they don't know about each other. There are solutions, but not in >the space we're talking about here. > > However in a true failover environment this problem would not exist. Check out what I have implemented. People are using it--it works! http://www.sporner.com/bsdclusters To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-cluster" in the body of the message