What are the protocols?
The InfiniBand version of Xsigo used proprietary protocols for server IP and storage access (Xsigo vNIC and Xsigo vHBA). They submitted these protocols to the Open Fabrics organization, but I do not recall any mention of the Xsigo protocols in the latest Open Fabrics Sonoma Conference.
This does not appear to be an FCoE solution. It appears to be an Ethernet iSCSI front-end kludge to an InfiniBand bridge. So I assume storage goes from GigE iSCSI, to an encapsulated proprietary Xsigo InfiniBand storage protocol, back to native Fibre Channel. This could be done via a standardized iSER (iSCSI over RDMA) protocol. IP traffic could either go from native Ethernet to an encapsulated proprietary Xsigo InfiniBand IP protocol, or via a standardized IPoIB (IP over InfiniBand) protocol.
I assume Xsigo would use its proprietary protocols, as its central management of vNICs and vHBAs are what differentiates Xsigo's solution.
Either way, if indeed it is iSCSI to the host, this is little more than an iSCSI to FC router, with some added management intelligence. But the iSCSI router industry died a decade ago, once native iSCSI storage came along.