From owner-freebsd-hackers Fri Oct 11 2:11:16 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 045B837B401 for ; Fri, 11 Oct 2002 02:11:15 -0700 (PDT) Received: from scribble.fsn.hu (scribble.fsn.hu [193.224.40.95]) by mx1.FreeBSD.org (Postfix) with SMTP id 2F09143EB7 for ; Fri, 11 Oct 2002 02:11:12 -0700 (PDT) (envelope-from bra@fsn.hu) Received: (qmail 6526 invoked by uid 1000); 11 Oct 2002 09:11:11 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 11 Oct 2002 09:11:11 -0000 Date: Fri, 11 Oct 2002 11:11:11 +0200 (CEST) From: Attila Nagy To: Dan Nelson Cc: hackers@FreeBSD.ORG Subject: Re: Sharing a SCSI bus between some computers In-Reply-To: <20021010172835.GA24603@dan.emsphone.com> Message-ID: References: <20021010172835.GA24603@dan.emsphone.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hello, > As long as BOX3 never writes data, you're okay. If this would be the scenario, all boxes would mount the FS RO :) > The problem is that BOX1/2 don't know when BOX3 has invalidated their > cached data by writing to the disk. What problems could that cause? I don't mind if BOX[1-2] reads a file and the file disappears in the middle of the transfer, if those boxes can recognize it and will not read other portions of the hard disk. In short: if they won't offer corrupt data to the clients. > What you want is a shared-storage filesystem, and there is no such thing > for FreeBSD. BTW, is it possible to do it with common SCSI storage, or it would need some sophisticated solution, like fibre channel? > Considering you can get a gigabit ethernet NIC for under $50 and a > D-Link 4-port gigabit switch for $300, you might just want to plug the > RAID into BOX3, and have BOX1/2 NFS-mount it. Oh I know this :) Actually, this is exactly what I have. But because the machines (box1-3) aren't as powerful at all, I would like to get the maximum out of them. ----------[ Free Software ISOs - http://www.fsn.hu/?f=download ]---------- Attila Nagy e-mail: Attila.Nagy@fsn.hu Free Software Network (FSN.HU) phone @work: +361 210 1415 (194) cell.: +3630 306 6758 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message