Yeah, not normalised

"Rather than rip and replace, Cisco already had Nexus 7000 switches - which have the converged Fibre Channel over Ethernet fabric - [snip]"

FCoE, which, small detail, is not yet normalised, and thus, being non trivially a lossless protocol (FC) mapped onto a loosing frames protocol + random retries (Ethernet), is surely going to go through a period of try and fail. After normalisation.