Hi, i currently have a Linux server setup to host a website.  Currently i have one of my four hard drives configured so i am only using 1/4 of my total 1200 GB.  I was told by a friend that this is unsafe in the event of it crashing, it could damage all four.  I was also told that setting up a Mirrored RAID setup will be the best thing for my system.  I was wonder if anyone could tell me the steps to configuring this setup from my current setup. I will greatly appreciate the help. Thanks.