From owner-freebsd-hackers Fri Oct 11 2:39: 4 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 8DC9D37B401 for ; Fri, 11 Oct 2002 02:39:03 -0700 (PDT) Received: from scribble.fsn.hu (scribble.fsn.hu [193.224.40.95]) by mx1.FreeBSD.org (Postfix) with SMTP id 0112543E9E for ; Fri, 11 Oct 2002 02:39:01 -0700 (PDT) (envelope-from bra@fsn.hu) Received: (qmail 7761 invoked by uid 1000); 11 Oct 2002 09:39:02 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 11 Oct 2002 09:39:02 -0000 Date: Fri, 11 Oct 2002 11:39:02 +0200 (CEST) From: Attila Nagy To: Bruce M Simpson Cc: Dan Nelson , Subject: Re: Sharing a SCSI bus between some computers In-Reply-To: <20021011081814.GD25634@spc.org> Message-ID: References: <20021010172835.GA24603@dan.emsphone.com> <20021011081814.GD25634@spc.org> 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, > I believe that SGI's xfs is capable of handling shared-storage setups... After Dan's mail I would think that only some kind of signalling would needed to accomplish the task of one RW and multiple RO machines using the same SCSI storage. This could be done in the hardware and in the software. All I could get on this topic is the problem of multiple RW machines, for which the Linux-specific GFS[1] used the SCSI locking feature of the individual devices and then implemented some kind of external locking, other distributed filesystems did similar methods. How difficult would be to implement this, either into the recently announced GEOM or some other layers? Thanks, [1]: http://www.sistina.com/products_gfs.htm ----------[ 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