From owner-freebsd-hackers Thu Oct 10 9:45:26 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 D5E2837B401 for ; Thu, 10 Oct 2002 09:45:24 -0700 (PDT) Received: from scribble.fsn.hu (scribble.fsn.hu [193.224.40.95]) by mx1.FreeBSD.org (Postfix) with SMTP id 0590243EB3 for ; Thu, 10 Oct 2002 09:45:21 -0700 (PDT) (envelope-from bra@fsn.hu) Received: (qmail 27187 invoked by uid 1000); 10 Oct 2002 16:45:22 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 10 Oct 2002 16:45:22 -0000 Date: Thu, 10 Oct 2002 18:45:22 +0200 (CEST) From: Attila Nagy To: hackers@freebsd.org Subject: Sharing a SCSI bus between some computers Message-ID: 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, Due to the lack of enough "networking power" I started to think about alternatives. I would like to ask your thoughts on the following setup: +----------+ +----------+ +----------+ + BOX1 +-------+ SCSI BOX +------+ BOX2 + +----------+ +----++----+ +----------+ || +----++----+ + BOX3 + +----------+ BOX[1-3] would be a PC with a SCSI adapter. SCSI BOX is an external SCSI RAID array. The line between the boxes is a single SCSI cable, on which the devices access the bus (it would be a correct chain, with a terminator on each end). The question is: what will happen if BOX3 mounts the filesystem from the SCSI BOX RW and BOX[1-2] mount it RO? In the case BOX[1-2] it is only necessary to read from the array, nothing more. I've seen a similar setup on Sun hardware, where the disk array was used by two computers. RW/RO, as in this case. Does anybody have experiences regarding this? Is it possible/necessary to hack some kind of locking into the SCSI driver? The adapters are made by Adaptec (aic7xxx). Thanks, ----------[ 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