New BSD Installer

Kevin Oberman kob6558 at
Mon Feb 20 05:51:51 UTC 2012

On Sat, Feb 18, 2012 at 11:09 PM, Freddie Cash <fjwcash at> wrote:
> If you're mirroring the disk with gmirror, how are you dual-booting the
> disk?
> This discussion is about using gmirror to mirror two entire disks, and then
> use GPT to partition the mirror device.
> Dual-booting has no bearing on that, as gmirror is a FreeBSD-only
> technology.

Yes, this discussion is about mirroring and that is only applicable to
FreeBSD (as is GEOM, itself), but a full disk geom will use the last
block in the disk and GPT does not allow this. If a disk is geomified
for any reason and is a dual-boot disk (and I'll admit I can't think
of any case where this would make be done today), the compatibility of
GEOM and GPT will lead to problems that will get increasingly serious
as time passes.

It just seems like a very bad idea to play fast and loose with an
industry standard like this. It comes back to bite you in the butt all
too often.
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at

More information about the freebsd-stable mailing list