From owner-freebsd-hackers Tue Feb 15 11:59: 3 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12]) by builder.freebsd.org (Postfix) with ESMTP id 3F7654F0A for ; Tue, 15 Feb 2000 11:51:07 -0800 (PST) Received: from yedi.iaf.nl (uucp@localhost) by uni4nn.gn.iaf.nl (8.9.2/8.9.2) with UUCP id UAA13672; Tue, 15 Feb 2000 20:30:54 +0100 (MET) Received: (from wilko@localhost) by yedi.iaf.nl (8.9.3/8.9.3) id TAA00712; Tue, 15 Feb 2000 19:43:22 +0100 (CET) (envelope-from wilko) Date: Tue, 15 Feb 2000 19:43:22 +0100 From: Wilko Bulte To: David Scheidt Cc: Banu Ozden , freebsd-hackers@FreeBSD.ORG Subject: Re: scsi target mode Message-ID: <20000215194322.B597@yedi.iaf.nl> References: <200002141719.MAA18497@aura.research.bell-labs.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: ; from dscheidt@enteract.com on Tue, Feb 15, 2000 at 11:39:24AM -0600 X-OS: FreeBSD yedi.iaf.nl 3.4-STABLE FreeBSD 3.4-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Feb 15, 2000 at 11:39:24AM -0600, David Scheidt wrote: > On Mon, 14 Feb 2000, Banu Ozden wrote: > > > here's a diagram depicting what we want to do. we're trying to setup > > a PC (PC2 below) with an adaptec controller to act as an emulated disk. > > PC 1 will access the disks on PC 2. > > I don't do this on FreeBSD, but I do a lot of this under HP/UX. Our > configurations look like this: > > --------------- --------- ---------------- > | Host Adaptor0| | DISKS | | Host Adaptor1 | > | SCSI ID=7 |======| |=======| SCSI ID=6 | > | | | | | | > --------------- --------- ----------------- > > As for termination, remember that SCSI is a bus. It goes from here to > there, and has a terminator at each end. We no longer use the on card > termination. HP make a nifty pass-through terminator (part number C2980A, > for F/W/D busses only) that allows one controller be disconnected without > breaking bus termination. Very handy if you need to do work on one system > without disturbing the application running on the other. I advise against > putting a SCSI controller in the middle, unless you use a Y cable. Maybe you can find Y-cables from DEC/Compaq. Or something we call a trilink, which has 2 female and 1 male connector. We tend to use trilinks on raid controllers. Generally speaking 'joining' machines into cluster(like) you want to use differential SCSI buses. -- Wilko Bulte Arnhem, The Netherlands WWW : http://www.tcja.nl To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message