Z-SAN is a proprietary type of storage area network licensed by Zetera corporation.
[1] The shared disk file system allows multiple computers to access the same volume at block level.
The Z-SAN software license is purchased as part of the hardware package and is similar to ATA over Ethernet (AoE) sold by Coraid and LeftHand Networks.
Zetera does not sell products directly, but instead licenses its technology to various other companies such as Netgear and Bell Microproducts.
The Zetera website claims that MIT has a Z-SAN array totaling 1.4 Petabytes of storage.