Best way I've found is to make /boot a small RAID1 (e.g. below is /dev/md0) on /dev/sda1 and /dev/sdb1, then your lilo conf just has to have these lines:

boot=/dev/md0
raid-extra-boot=/dev/sda,/dev/sdb

And if the sda disk dies, it will still boot of sdb and use the md0 to boot.

Just thought I'd put a few more technical details rather than just saying "this will work"

Linux can boot from raid-1. So you could chop off a partition from sdb
for / and put swap on sdc.  Another approach is to have  alternative
installation on a partition on sdb.  This can be quite convenient for
upgrades and error recovery.



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