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This guide explains how to set up software RAID1 on an already running Fedora 8 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).

I do not issue any guarantee that this will work for you!

1 Preliminary Note

In this tutorial I’m using a Fedora 8 system with two hard drives, /dev/sda and /dev/sdb which are identical in size. /dev/sdb is currently unused, and /dev/sda has the following partitions:

• /dev/sda1: /boot partition, ext3;
• /dev/sda2: swap;
• /dev/sda3: / partition, ext3

In the end I want to have the following situation:

• /dev/md0 (made up of /dev/sda1 and /dev/sdb1): /boot partition, ext3;
• /dev/md1 (made up of /dev/sda2 and /dev/sdb2): swap;
• /dev/md2 (made up of /dev/sda3 and /dev/sdb3): / partition, ext3

This is the current situation:

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