First up: a SAN is a Storage Area Network - it is also called a Fabric. Storage arrays are often called SANs incorrectly - the SAN is the the switched network itself.
Hubs are not used in a SAN - only Fibre Channel switches. Bridges are not the same as an Ethernet bridge - you'd use a bridge to connect a native SCSI device such as a tape drive to a SAN. There is a similar construct to a hub in an arbitrated loop (similar to the old token ring network), but that's a technology that is no longer in use. The switched fabric has replaced the arbitrated loop in storage networking
