iSCSI
With iSCSI you can access storage over an IP-based network.
The exported storage entity is the target and the importing entity is the initiator.
Since Linux 2.6.38 LIO is the in-kernel iSCSI target. Before that it was tgt. SCST was another candidate for kernel inclusion.[1]
The current initiator is Open-iSCSI.
It is possible to boot Arch Linux via iSCSI.