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Date:      Fri, 25 Oct 2002 13:03:24 -0700
From:      Brooks Davis <brooks@one-eyed-alien.net>
To:        Mark Valentine <mark@thuvia.demon.co.uk>
Cc:        John Baldwin <jhb@FreeBSD.ORG>, Poul-Henning Kamp <phk@critter.freebsd.dk>, "M. Warner Losh" <imp@bsdimp.com>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, Mikhail Teterin <mi+celsius@aldan.algebra.com>
Subject:   Re: cvs commit: src/lib/libdisk Makefile chunk.c write_alpha_dis
Message-ID:  <20021025130324.A7985@Odin.AC.HMC.Edu>
In-Reply-To: <200210251939.g9PJde9E079205@dotar.thuvia.org>; from mark@thuvia.demon.co.uk on Fri, Oct 25, 2002 at 08:39:40PM %2B0100
References:  <XFMail.20021025145539.jhb@FreeBSD.org> <200210251939.g9PJde9E079205@dotar.thuvia.org>

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On Fri, Oct 25, 2002 at 08:39:40PM +0100, Mark Valentine wrote:
> > From: John Baldwin <jhb@freebsd.org>
> > Seriously.  What you want is logical volume names.  GEOM does not provi=
de
> > that.  The old kernel code didn't either.  What you want is to add an
> > extra layer to do the physical <-> logical mapping.
>=20
> I don't want to add unnecessary layers; simply a way to specify what I
> currently can so that my systems boot more reliably.

I don't understand how magicly ignoring the actual disk structure is
more reliable.  If anything in introduces new opportunities for foot
shooting.

For example, lets say you had a system configured like the one John
showed us with the first MBR partition being Windows and the second
being FreeBSD.  Now let's say you decide the some new office suite is
sufficently good that you don't need Windows anymore so you stop using.
Now one day, you ralize that you're /usr is getting way too full so you
decided to nuke /dev/ad0s1 and install a BSD disk lable on it with some new
partitions for /usr/local and maybe one for your MP3 collection.  Now,
if you were using /dev/ad0s2[a-h] entris in /etc/fstab you're not too
badly off, but if you were using /dev/ad0[a-h] entries, those now point
to /dev/ad0s1 not /dev/ad0s2 so init fails at boot.

-- Brooks

--=20
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529  9BF0 5D8E 8BE9 F238 1AD4

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