How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Debian Etch)

This guide explains how to set up software RAID1 on an already running Debian Etch system. The GRUB bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one). http://www.howtoforge.com/software-raid1-grub-boot-debian-etch