I don’t think it’s just me, but ATA over ethernet has got to be one of the coolest things I’ve seen, recently. ATA over ethernet basically lets a driver on your computer access hard drives on a LAN (AoE is not routable). You can then set the multiple drives you access up to be mounted into a software raid array.
Basically, you’re using ethernet cabling plus some driver magic to connect hard drives up to your server.
Right now, the only manufacturer I’ve seen who makes ATA over ethernet products is a company named Coraid
You can get full details about how to set one of these things up in the June 2005 issue of Linux Journal, in the article titled, “ATA over Ethernet: Putting Hard Drives on the LAN”
For further reading, you can go to the Linux Journal article resources page