FreeBSD for serious performance?

[Warren Block]

On Sun, 9 Dec 2012, Dieter BSD wrote:

>> B. Use GPT, which does not have the CHS baggage.  It is easier and more
>>    versatile.  My systems with GPT disks don't complain about track
>>    alignment.  Or maybe that's ahci(4)'s doing.
>
> I never found a way to boot from different partitions, much less
> different disks with GPT.

Grub (or grub2) can do it.  I haven't tried it because other operating 
systems I multiboot do not support GPT anyway.  If you're booting 
multiple versions of FreeBSD, see gpart(8) for some partition attributes 
that may help.  Or even consider ZFS boot environments.