Miniman said EMC has been in no rush to support FCoE in its storage, since the top-of-rack switch-to-storage approach holds little appeal to customers. "Most customers want to have some aggregation typically through a director before they get to the storage, and I can't do that natively with FCoE today," he said.
Plus, the standards that will enable FCoE between multiple FCoE Forwarder (FCF) switches are in development, so users also currently are not able to go from one top-of-rack switch to another top-of-rack switch with FCoE traffic, Miniman noted. "I can't cascade them," he said. "I can only go to one switch and then from that switch, I have to switch over to Fibre Channel."
# No Multipath – Since Ethernet is a Layer 2 protocol, it is not routable, but the IETF is working on it with a specification called TRILL (Transparent Interconnection of Lots of Links). TRILL will provide a solution for shortest-path frame routing in multi-hop CEE networks with arbitrary topologies. TRILL closely resembles Cisco’s L2MP (Layer 2 Multipathing) protocol. Solutions will be able to have multipathing only after TRILL is fully approved and implemented in products. The result is less than optimal resource utilization and no load balancing.