Manual GRUB install of Bootloader
Linked from: Configuring Partitions and RAID
We are almost done with the software RAID configuration. Next, the installation wizard will ask for the boot loader settings.
If have trouble booting up your system with GRUB, you can use the LILO boot loader as an alternative. However, you will need to type the following on the first installation screen: linux lilo.
If the secondary disk fails (/dev/sdc), then the system will still be bootable. If the primary disk fails (/dev/sda), then your system will not boot. In order to make the secondary disk bootable as well, run the following command: