Date: Tue, 15 Feb 2000 19:43:22 +0100 From: Wilko Bulte <wilko@yedi.iaf.nl> To: David Scheidt <dscheidt@enteract.com> Cc: Banu Ozden <ozden@research.bell-labs.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: scsi target mode Message-ID: <20000215194322.B597@yedi.iaf.nl> In-Reply-To: <Pine.NEB.3.96.1000215111759.60129B-100000@shell-1.enteract.com>; from dscheidt@enteract.com on Tue, Feb 15, 2000 at 11:39:24AM -0600 References: <200002141719.MAA18497@aura.research.bell-labs.com> <Pine.NEB.3.96.1000215111759.60129B-100000@shell-1.enteract.com>
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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
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