Hi Magellan, just wanted to clarify a couple of things for you here.
Xsigo is an open standards company, there is no proprietary lock in protocols at play here. All connections / Ports etc are standard "off the shelf" IO cards like Broadcom/QLogic etc, and use standard SFP+, CX4 & QSFP Connections (for 10GbE, 20Gb and 40Gb Infiniband, respectively).
The protocols at play here are indeed RDMA, so FC and Ethernet packets are rapped in the standard RDMA protocol and pushed up to the dumb card inside the server (the card has no intelligence, and is a standard 1 or 10Gb Ethernet cards, or Host Channel Adapters from Mellanox for the IB). IP over IB, as i'm sure you're aware, is an extremely advantageous standard protocol with super low latency over a much fatter pipe. For Ethernet we use CEE.
All intelligence is done in the Xsigo directors, which is completely different from FCoE, as the vHBAs and vNICs are created and live on the CNA card itself - which makes live migrations of IO profiles, NICs and HBAs a very challenging feat. As we don't use FCoE (which in itself isn't a fully ratified and standardised protocol), we can use "off the shelf" technology, meaning our costs are typically 1/3 the cost of an FCoE solution, but we provide higher bandwidth, more capabilities like vNIC and vHBA QoS and Network Disaster Recovery (for example).
I'm happy to discuss this further on mail or via a meeting to show you the technology at play.
EMEA Systems Engineer - Xsigo Systems