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Reduce network storage cost, complexity with ATA over Ethernet

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Today, Fibre Channel is the dominant enterprise storage technology, but as with all technologies, eventually something better comes along. If you're lucky, that something is also less complex and less expensive. For storage, that something may be ATA over Ethernet (AoE), a simple and open network protocol that allows storage to be accessed over Ethernet. Here's how you can set up a test server to provide shared storage using AoE.

AoE got its start when a company named Coraid launched a series of storage devices based on AoE in the summer of 2004. AoE's inclusion in the Linux kernel came a year later with kernel 2.6.11. The entire protocol specification is only nine pages long.

AoE is conceptually similar to the more widely known iSCSI (Internet Small Computer System Interface). The promise of iSCSI was that Fibre Channel storage area networks (SAN) could be replaced by much cheaper IP-based storage networks. iSCSI encapsulates SCSI commands in IP packets, allowing storage to be placed anywhere on the LAN or even the Internet. The problem with iSCSI is the extra processing required for wrapping and unwrapping the packets in IP. All things being equal, the performance of iSCSI SANs fall short of Fibre Channel unless you start adding expensive TCP offload cards to the mix, which significantly reduce the cost savings of using iSCSI in the first place.

AoE is out to change all that.

Full Story.

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