There are two ways to get a SAN working on a Linux computer :

For each technology, there is a server and a client side.

On a Linux system, the client side of each of the technology, iSCSI and AoE (ATA over Ethernet) are in a stable state. But on the server side, AoE is the only software that is in a stable state. iSCSi server side is still not in 1.x.x version.