On Mon, 2008-02-04 at 22:43 +0000, Alan Cox wrote:Actually, there's also FCoE now ... which is essentially SCSI encapsulated in Fibre Channel Protocols (FCP) running over ethernet with Jumbo frames. It does the standard SCSI TCQ, so should answer all the latency pieces. Intel even has an implementation: http://www.open-fcoe.org/ I tend to prefer the low levels as well. The whole disadvantage for IP as regards iSCSI was the layers of protocols on top of it for addressing, authenticating, encrypting and finding any iSCSI device anywhere in the connected universe. I tend to see loss of routing from operating at the MAC level to be a nicely justifiable tradeoff (most storage networks tend to be hubbed or switched anyway). Plus an ethernet MAC with jumbo frames is a large framed nearly lossless medium, which is practically what FCP is expecting. If you really have to connect large remote sites ... well that's what tunnelling bridges are for. James --
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