M. Warner Losh wrote:
In message: <4a6a7f2d.90...@samsco.org>
Scott Long <sco...@samsco.org> writes:
: 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.
I think you were missing the point I was trying to make, I must have
been unclear.
If there were more than 256 sectors in the first cylinder, then
starting at 256 would overlap. This is largely a theoretical
problem, I think, since I don't think that the BIOS can report a
geometry > 64.
The only issue that I can think of is that FreeBSD's fdisk wants to
have things on cylinder boundaries, which 256 isn't, so fdisk will
bitch and moan...
Warner
Ah, we will never be freed of the CHS bonds, will we. Oh well.
Scott
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