Your machine must have two disks of the same size.

My machine has two hot-swappable SCSI disks, so they are named /dev/sda and /dev/sdb. If you are using ide disks, they will be /dev/hda and /dev/hdb. This procedure should work with either type of disks. I have used sda and sdb in this document in several places as a convenience.

In order to boot from the RAID, you will need to make sure that:

• The / partition is on RAID device md0.
• The md0 RAID device is on partition 1 of both the disks.
• Partition 1 of both the disks are marked as bootable.
• The / partition is not too large (I dont know the exact size, but 1 GB is too large).