you have to have raid hardware to configure hardware raid. it sounds kind of circular but it isn't. do you have a raid controller? if you don't, you cannot configure hardware raid. if you do, look it up on the internet and follow the instructions. First, determine what type of raid you want to use. go to
http://www.staff.uni-mainz.de/neuffer/scsi/what_is_raid.html to read about the different raid types. some are built for speed others for data retention. RAID 5 is a good combo of both if you have 4 or more disks. All disks have to be the same size. your controller will most likely have an install program to help you.