Newsgroups: comp.unix.ultrix
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From: grunwald@foobar.colorado.edu (Dirk Grunwald)
Subject: Re: Large drives off of a Decstation 3100
In-Reply-To: yzarn@lhdsy1.chevron.com's message of 10 Jun 91 17:12:23 GMT
Message-ID: <1991Jun10.191226.20217@colorado.edu>
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References: <12232@jarthur.Claremont.EDU> <940@lhdsy1.chevron.com>
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Date: Mon, 10 Jun 1991 19:12:26 GMT
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>>>>> On 10 Jun 91 17:12:23 GMT, yzarn@lhdsy1.chevron.com (Philip Yzarn de Louraille) said:

PYdL> In article <12232@jarthur.Claremont.EDU> jjensen@jarthur.claremont.edu (Jeff Jensen) writes:
>We're running Ultrix 4.1 Rev 52 off of a DecStation 3100.  We are in the
>process of getting a new drive, of about 1.2gig.  Now to the question...
>For some reason, I seem to remember hearing that there were problems
>running a disk of this size under Ultrix.  Is this true, and if so, are
>there any patches?  Any information/pointers to places to look would be
>appreciated.

PYdL> Nah. Just don't make any partition any bigger than 1 GB and you will be
PYdL> fine.
PYdL> -- 
--

wrong. If you're using a pre-4.2 Ultrix, you can not use more than
2^21 sectors in any given drive. The Ultrix SCSI drivers use a command
set that has sector numbers modulo 2^21; if you use more than 2^21,
you will e.g., over-write the superblock or things in the lower
portion of your disk. This is bad.

Ultrix 4.2 allegedly fixes this scsi driver. They may have a
limitation of 2^21 sectors per partition, I dunno.


Dirk Grunwald -- Univ. of Colorado at Boulder	(grunwald@foobar.colorado.edu)
						(grunwald@cs.colorado.edu)