Date: Fri, 20 Jul 2001 21:32:48 +0200 From: Thierry Herbelot <thierry@herbelot.com> To: Wilko Bulte <wkb@freebie.xs4all.nl> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: dual booting -stable & -current Message-ID: <3B588760.E5875DBB@herbelot.com> References: <20010720183229.A9022@freebie.xs4all.nl>
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Wilko Bulte wrote:
>
> I'm probably completely dim today so please bear with me :/
> Thing is I want to setup a dual-boot box, running -stable & -current.
> This box, a P2/266 has a 30G IDE disk.
>
> What I did is create
> ad0s1 -> 256MB -> holds root for -stable
> ad0s2 -> 256MB -> was supposed to hold root for -current
> ad0s3 -> roughly 14G holds tmp,var,usr,usr/obj for -stable
> ad0s4 -> ditto for -current
>
> My recollection is that as long as you keep the root partitions <2 (or 8) GB
> it should be bootable. Hence this somewhat strange slicing.
>
> Thing is, 4.3R refuses to install it's root on ad0s2 (4.3 because I want
> to go current from there).
>
> I'm probably missing something obvious here?
here's what I have on my (just -Stable for the moment) workstation :
multi# fdisk ad4
******* Working on device /dev/ad4 *******
parameters extracted from in-core disklabel are:
cylinders=35390 heads=16 sectors/track=63 (1008 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 63, size 2457441 (1199 Meg), flag 0
The data for partition 2 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 4095504, size 31577616 (15418 Meg), flag 0
he data for partition 3 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 2457504, size 1638000 (799 Meg), flag 80 (active)
The data for partition 4 is:
<UNUSED>
// main bootable partition
multi# disklabel -r ad4s1
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 102400 0 4.2BSD 1024 8192 16 on /
b: 860160 102400 swap shared swap
c: 2457441 0 unused 0 0
e: 40960 962560 4.2BSD 1024 8192 16 on /var
f: 1453921 1003520 4.2BSD 1024 8192 16 on /usr
// alternate bootable partition (will be -Current)
multi# disklabel -r ad4s3
# size offset fstype [fsize bsize bps/cpg]
a: 102400 0 4.2BSD 1024 8192 16 on alternate /
c: 1638000 0 unused 0 0
e: 40960 102400 4.2BSD 1024 8192 16 alt. /var
f: 1494640 143360 4.2BSD 1024 8192 16 alt. /usr
multi# disklabel -r ad4s2
# size offset fstype [fsize bsize bps/cpg]
c: 31577616 0 unused 0 0
e: 31577616 0 4.2BSD 0 0 0 shared expanse
you may want to use a similar setup (with larger bootable partitions :
my setup was initially one only 2G partition, but I cut it this way,
with a shared swap to be able to dual-boot)
PS : I also had problems with a 40G disk on my oldish P-II/266 : it
would not boot from the large disk (I just added a spare 8G which I boot
from)
--
Thierry Herbelot
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