The choice between using Fibre Channel (FC) or other protocols is dictated by several factors, one of them being whether a dedicated SAN is required and/or desirable. Ethernet SANs are implemented in the context of a converged network or at the minimum sharing of switch ports for multiple use cases. Although, we see a rampant use of dedicated iSCSI fabrics also. FC networks are always utilized as dedicated SANs. For some use cases a dedicated SAN is not an option. In others, the mission critical nature of the application alone justifies a dedicated SAN.

Read the source article at Fibre Channel Industry Association