From Fedora Project Wiki
A complete installation using a RAID5 device for the /usr filesystem. For more details on RAID please consult http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks.
How to test
- Perform an installation where /usr exists on a RAID5 device
- Anaconda completes successfully
- Reboot successfully into installed system
- /usr is a raid device (e.g. /dev/md0)