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From: leonid@TAURUS.BITNET.UUCP
Newsgroups: mod.computers.vax
Subject: Re: Alternating Ultrix and VMS on a VAXstation 2000
Message-ID: <8702271635.AA14601@taurus>
Date: Fri, 27-Feb-87 20:04:39 EST
Article-I.D.: taurus.8702271635.AA14601
Posted: Fri Feb 27 20:04:39 1987
Date-Received: Sun, 1-Mar-87 10:26:22 EST
References: <8702181410.AA09488@csv.rpi.edu>
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Reply-To: leonid@.tau.ac.il.UUCP.taurus (Leonid Rosenboim)
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Organization: TAU C.S. Lab., Israel
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Approved: info-vax@sri-kl.arpa

In article <8702181410.AA09488@csv.rpi.edu> yerazuws@CSV.RPI.EDU.BITNET 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. ...
 
UNIX is not that stupid. If you want to have VMS on DUA0 and Ultrix on DUA1
and you are not willing to play with the "ONLINE" and "WRITE-PROTECT"
buttons, do the following:
 
Edit the file /sys/conf/SYSNAME (where SYSNAME is the configuration file
for your machine, the kernel diplayes this name when it boots),
the configuration line should look like:
 
config  vmunix  root on ra1 swap on ra1 dump on ra1
 
this menans that the UNIX will have ra1 (DUA1( as its primary disk.
Now, if you want to be ABSOLUTELY sure that while running UNIX nobody
touches your DUA0 (even superuser!) run the following commands :
 
        su              (become superuser)
        cd /dev
        rm ra0? rra0?
 
This removes the devices for DUA0 (ra0 on UNIX). Also reconfigure your
Ultrix by running /etc/config and make, and of course change the jumpers
to make your disk DUA1.
 
You can also invite a Unix-Guru to do it for you.
 
Leonid