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From: Paul Richards <paul@isl.cf.ac.uk>
Message-Id: <199503291025.LAA18458@isl.cf.ac.uk>
Subject: Re: kern/280: new slice manager totally confused about old slice disks
To: bde@zeta.org.au (Bruce Evans)
Date: Wed, 29 Mar 1995 11:25:58 +0100 (BST)
Cc: bde@zeta.org.au, gvrooij@mmra1.ms.philips.nl,
        freebsd-bugs@freefall.cdrom.com, jkh@freefall.cdrom.com,
        pst@shockwave.com
In-Reply-To: <199503290933.TAA25301@godzilla.zeta.org.au> from "Bruce Evans" at Mar 29, 95 07:33:09 pm
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In reply to Bruce Evans who said
> 
> >> I think sysinstall creates a valid disk label with size 
> >> #secpertrack * #heads * #cyl in both the d_secperunit and the 'd' partition
> >> size fields.  The problem occurs when the sd driver blows away the 'd'
> >> partition size field (replacing it with the total #sec) without touching
> >> the d_secperunit field.  The wd driver is more careful and verbose.  It
> 
> >Might well explain what we see indeed. But the same holds for the c partition.
> 
> Maybe sysinstall set the size of the c partition correctly to extend to
> the end of the disk, and d_secperunit to match.  Old versions of
> `disklabel -e' rounded down d_secperunit to a cylinder boundary so running
> `disklabel -e' could cause the problem.

I doubt sysinstall is doing anything right anymore. It certainly won't be
setting the c partition to cover the whole disk. It's still setting d to
cover the whole disk and c to the BSD slice.

-- 
  Paul Richards, FreeBSD core team member. 
  Internet: paul@FreeBSD.org,  URL: http://isl.cf.ac.uk/~paul/
  Phone: +44 1222 874000 x6646 (work), +44 1222 457651 (home)
  Dept. Mechanical Engineering, University of Wales, College Cardiff.