Quick and dirty linux software RAID5

I recently migrated my network storage server, running Ubuntu Linux incidently, to a software RAID 5 configuration. RAID level 5 requires atleast 3 harddrives; giving you in total N-1 storage, where N is the number of disks in the array. For my deployment, I used 3 120GB drives (mixing IDE and SATA, Linux is indifferent [...]