Rudi Ahlers wrote on Thu, 17 Jul 2008 23:10:48 +0200:
/boot shouldn't be mirrored, as the BIOS won't know how to boot it. leave /dev/sdb1 the same size as /dev/sda1 and call it /boot2 and try to remember to copy /boot to /boot2 each time you update the kernel.
I understand this, but how do you boot from /boot2 on the second HDD if the 1st have failed?
You don't (*). I don't understand John's advice here. There is no problem md mirroring /boot. You just need to install grub a second time on the other disk. For that you have to boot from it. (I think I also did it successfully without booting from the other disk in the past, but last time I tried it it didn't want to work like I remembered it should.)
(*) Anyway, you would boot from a Rescue CD or such and rename it ...
Kai