svn commit: r195817 - head/usr.sbin/sysinstall
Scott Long
scottl at samsco.org
Sat Jul 25 03:42:43 UTC 2009
M. Warner Losh wrote:
> In message: <4A68DA56.60301 at samsco.org>
> Scott Long <scottl at samsco.org> writes:
> : M. Warner Losh wrote:
> : > In message: <4A66D0F4.4030108 at FreeBSD.org>
> : > Alexander Motin <mav at 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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