M. Warner Losh wrote:
In message: <4a68da56.60...@samsco.org>
Scott Long <sco...@samsco.org> writes:
: M. Warner Losh wrote:
: > In message: <4a66d0f4.4030...@freebsd.org>
: > Alexander Motin <m...@freebsd.org> writes:
: > : Colin Percival wrote:
: > : > Author: cperciva
: > : > Date: Wed Jul 22 03:50:54 2009
: > : > New Revision: 195817
: > : > URL: http://svn.freebsd.org/changeset/base/195817
: > : >
: > : > Log:
: > : > Remove the "dedicated disk mode" partitioning option from sysinstall,
in
: > : > both the disk partitioning screen (the 'F' key) and via install.cfg
(the
: > : > VAR_DEDICATED_DISK option). This functionality is currently broken
in 8.x
: > : > due to libdisk and geom generating different partition names; this
commit
: > : > merely acts to help steer users away from the breakage.
: > : >
: > : > Submitted by: randi
: > : > Approved by: re (kensmith)
: > : >
: > : > Modified:
: > : > head/usr.sbin/sysinstall/disks.c
: > :
: > : Is there any other way to not align FS block to the ugly legacy 63
: > : sectors per track boundary with sysinstall now? I think RAIDs won't be
: > : happy. May be it would be better to fix it?
: >
: > The reason we do it like this is because the boot blocks occupy the
: > first cylinder group. Which with today's fake goemetry is 63
: > blocks...
: >
:
: I already covered this. Unfortunately, Randi didn't take my bait.
: Anyways, '63' is a minimum, it's not a singular value. It's also
: an incredibly bad default.
Yes. 256 is just as good as 63, unless the geometry reports more than
256 heads, which I don't think is possible...
Warner
If there is a BIOS in existence that can't find sector 256, then it
likely can't boot off of anything other than partition 1 in the fdisk
table. I bet that bugs like that were likely caught 15-20 years ago.
Scott
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