I am currently looking into options for what might be the best
and hopefully cheap way to add external storage to some machines
that can be used by multiple servers.

I realize that obviously some kind of external storage unit probably
attached to NFS might be my best option. I have also seen the product
from Coraid (http://www.coraid.com) that provides a device that does
ATA over Ethernet. Does anyone have experience with this product, or
can give me other alternatives?

Devin Atencio