From owner-freebsd-scsi  Thu Dec 31 07:31:01 1998
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From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199812311135.MAA12422@yedi.iaf.nl>
Subject: Re: FBSD 2.2.8: parts recommendation for fast 1 scsi channel sys
In-Reply-To: <28881.915064046@gjp.erols.com> from Gary Palmer at "Dec 30, 98 07:27:26 pm"
To: gpalmer@FreeBSD.ORG (Gary Palmer)
Date: Thu, 31 Dec 1998 12:35:27 +0100 (CET)
Cc: smp@csn.net, ANDREAS.KLEMM.AK@bayer-ag.de, scsi@FreeBSD.ORG
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As Gary Palmer wrote...
> Wilko Bulte wrote in message ID
> <199812301804.TAA02628@yedi.iaf.nl>:
> > I'm not familiar with the P2B-LS. Does it have 2 SCSI buses/interfaces?
> 
> The Asus P2B series has a AIC7890 LVD SCSI controller onboard, and a 
> AIC3860(?) chip which acts as a SCSI-SCSI bridge between LVD and ultra-wide. 
> So in terms of SCSI ID's etc, its all one bus, but because its bridged you can
> have a long LVD chain and a shorter UW chain without problems. (In theory)

Ah, I see. This indeed makes quite a difference. FWIW Symbios has a similar
'bridge' chip. That one was jointly developed by Digital & Symbios. It is
in use all over the place in the Digital ^H^H^H^H^H^H^H^H Compaq Storageworks
Ultra SCSI equipment. 

Wilko
_     ______________________________________________________________________
 |   / o / /  _  Bulte 				  email: wilko@yedi.iaf.nl 
 |/|/ / / /( (_) Arnhem, The Netherlands          WWW  : http://www.tcja.nl
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