lilo vs grub

[Alexandre Oliva]

On Oct 21, 2003, Chris Ricker <kaboom at gatech.edu> wrote:

> On Tue, 21 Oct 2003, Alexandre Oliva wrote:
>> On Oct 21, 2003, Jeremy Portzer <jeremyp at pobox.com> wrote:
>> 
>> > Use the "--once" flag to the "savedefault" command.
>> 
>> Talking of this feature, how does it work in a raid1 scenario, in both
>> grub and lilo?  I'm genuinely curious.

> How's it even related? They're orthogonal. savedefault --once just says boot
> the specified stanza by default next time only (just like lilo -R does, with
> the difference that lilo -R is documented ;-)

Well, you have to record somewhere the fact that you've already booted
that way once.  If you write it to only one of the raid1 replicas,
they become inconsistent, and who knows what you'll get next time you
read from that block in the raid set?  Worse: if there's no resync to
get them on the same page, if primary fails, you may get surprisingly
booted to something other than what you expected.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer