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Re: Is it possible to have 2 SCSI controllers ?

daemon@ATHENA.MIT.EDU (Andrew Walker)
Thu Jul 20 11:10:43 1995

From: andy@keo.kvaerner.no (Andrew Walker)
To: hew1chr1@fort.midkent.ac.uk (Chris Hewitt)
Date: Thu, 20 Jul 1995 12:15:24 +0200 (MET DST)
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.SOL.3.91.950720085803.6364B-100000@samson> from "Chris Hewitt" at Jul 20, 95 08:59:12 am

Chris Hewitt wrote:
> 
> I need to setup a machine to support 10 quad speed CD-ROM drives. Hence 
> is it possible to have 2 SCSI CD-ROM contollers (preferably Adaptec) 
> supporting 5 Drives each. Has anyone done this ? Is it possible ? If I can't
> get it to work with Linux I'm being threatend with SCO - which it does 
> work with (and we don't want that now do we, yeack).
> 
> Cheers,
> 	Chris
> 

According to the SCSI HOWTO you can definitely have 2 Adaptec 154X or
274X boards in one PC. I'm assuming the same is true for 284X/294X since
only the bus type varies.

Although BusLogics are not listed with multiple card support in the HOWTO
the driver does support this. As Drew suggests in the HOWTO, these boards
will probably suit most people's needs, because:

	a) they're Adaptec compatible, intelligent bus-masters
	b) they feature active termination
	c) they don't suffer from the cable sensitivity problems
	   of the AHA1542C/CF boards
	d) Leonard Zubkoff's new beta driver for BusLogic ensures
	   excellent performance and reliability with all types
	   of bus
	e) they tend to be slightly cheaper than Adaptec

BTW: how about 2 or 3 CD jukeboxes rather than 10 individual CD-ROM
drives. Then you'd only need 1 SCSI card. But I suppose performance
would suffer badly if you need continuous random access to all 10
disks. Rather a lot of shuffling ;-)

Looks like you're saved from the dreaded SCO.

-Andy

-- 
Andy Walker                              Kvaerner Engineering a.s.
Andrew.Walker@keo.kvaerner.no            P.O. Box 222, N-1324 Lysaker, Norway

   ......if the answer isn't violence, neither is it silence......

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