Why would you compare FCoE and iSCSI on a 10Gbit network interface vs. Fibre Channel running at only 4Gb?
@davidsinaus: You will notice that the bandwidth for FCoE and iSCSI were managed to 4Gb via ETS to ensure that it was an apples to apples comparison in terms of bandwidth. Sicne DCB - a requirement for FCoE - requires a DCB capable CNA and switch, which are all no "slower" than 10Gb, you have no choice ethernet bandwidth class of devices.
You compare a 10Gb iSCSI network with a 4Gb FC network, but for the price of a 10Gb iSCSI network you can buy a 8Gb FC network. The price is the only common element you can compare. Which performance you can have for the same price.
@ManuFr Have you ever bought a FC switch? If you look at Brocade based switches, it´s not only the FC switch itselft you have to buy, add the fc modules, add licenses, add software and hardware support contract for the hardware. You can get 10Gbe ethernet switches for a much lower price nowadays...