You can also define it in fstab by using udev uuid or id:
UUID=32aaec89-2ed8-4xx6-a8fd-c2a0f8xxxxxf       /       noatime
/dev/disk/by-id/name    /       noatime


On Thu, 30 Dec 2010 16:44 -0600, "Jeremy MountainJohnson"
<jeremy.mountainjohnson at gmail.com> wrote:
> I don't use Ubuntu, but I assume it uses Grub. You can have Grub use 
> UUIDs, that's actually what I do.
> 
> title  distro
> root   (hd0,0)
> kernel /boot/vmlinuz26-bfs 
> root=/dev/disk/by-uuid/fdgsfdg-gre-491c-gegre-gregrege quiet vga=773 
> resume=/dev/sda1 ro
> initrd /boot/kernel26-bfs.img
> 
> *Jeremy MountainJohnson*
> jeremy.mountainjohnson at gmail.com
> <mailto:jeremy.mountainjohnson at gmail.com>
> 
> 
> On 12/30/2010 04:22 PM, gregwm wrote:
> > if i understand correctly, a client of mine has a relatively new
> > serverbox that has a curious problem, when it boots up it is
> > inconsistent which disc is sda and which is sdb.  anyone heard of this
> > interesting feature?  with the now standard UUID defs in /etc/fstab
> > linux is unperturbed, as long as it boots at all, which is the
> > problem.  can anyone guide me to installing working mbr's on both,
> > using jaunty grub (0.97-29ubuntu53), in a reliable manner, as site
> > visits are out of the question..
> >
> > _______________________________________________
> > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota
> > tclug-list at mn-linux.org
> > http://mailman.mn-linux.org/mailman/listinfo/tclug-list
> 
> _______________________________________________
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>