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Coraid has introduced a free-standing tower of shared Ethernet storage, using a low-level protocol that avoids the need for Fibre Channel or iSCSI.
Coraid has introduced a free-standing tower of shared Ethernet storage, using a low-level protocol that avoids the need for Fibre Channel or iSCSI.
The EtherDrive SR1521T can hold up to 11.25TB of serial ATA disk capacity and communicates by Application over Ethernet (AoE), which is low level, much simpler than TCP/IP, and that does away with the need for Fibre Channel or iSCSI hardware.
TCP/IP and IP are necessary for the reliable transmission of data over the Internet, but for local area storage they aren't necessary, and introduce complexity that makes the computer work harder, says Coraid. TCP/IP is a wide area network protocol designed for unreliable networks, while server access to local drives is a local network problem, the company said.
PC World wrote:
The ATA over Ethernet protocol takes advantage of today's smart Ethernet switches with their flow control which increases throughput and limits packet collisions. Packet order is preserved, and each packet is checked for integrity by the switch hardware.
Each AoE packet carries a command for an ATA drive or the response from the ATA drive. The O/S AoE driver makes the remote disks available as normal block devices, such as /dev/etherd/e0.0 (in Linux) just as the IDE driver makes the local drive at the end of your IDE cable available as /dev/hda. The driver retransmits packets when necessary, so the AoE devices look like any other disks to the rest of the kernel.
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