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From: bob%cald80%sunybcs%math@math.waterloo.edu.UUCP
Newsgroups: mod.computers.vax
Subject: Submission for mod-computers-vax
Message-ID: <8702200219.AA23933@gort.SUNYAB>
Date: Thu, 19-Feb-87 20:20:48 EST
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Posted: Thu Feb 19 20:20:48 1987
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Path: cald80!bob
From: bob@cald80.UUCP (bob)
Newsgroups: mod.computers.vax
Subject: Re: Alternating Ultrix and VMS on a VAXstation 2000
Message-ID: <851@cald80.UUCP>
Date: 20 Feb 87 01:20:47 GMT
References: <8702171856.AA15847@noao.ARPA> <8702181410.AA09488@csv.rpi.edu>
Reply-To: bob@cald80.UUCP (bob)
Organization: Calspan Advanced Technology Center
Lines: 31

In article <8702181410.AA09488@csv.rpi.edu> yerazuws@CSV.RPI.EDU (Crah) writes:
>If you're willing to physically move disks, the solution is known (and simple)
>VMS can be booted from any device in the system, but Unix/Ultrix always
>wants to see itself on the 0'th device.  So, put Ultrix on DUA0 and
>VMS anywhere else.

WRONGO! 

I have personally run UNIX (4.2BSD) on a 780 on hp1 (DRA1).  In
fact, I used that method to bring the run the system when hp0 (DRA0)
crashed violently (head crash, tire tracks on disk, not a pretty
sight).

The problem is that DEC butchered UNIX when they started
distributing it.  In 4.2BSD, you can put a line in your config file
which goes something like:

	root on hp0 or hp1 or hp2

which will tell the system that it can run on any of those three
disks.

I don't think that Ultrix will allow you to do that.  The thing
about Ultrix is that it's close enough to BSD to get you into
trouble.

-- 
					Bob Meyer
					Calspan ATC
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