Cisco UCS I/O Modules (FEX)
The Fabric Extender (also referred to as the I/O Module, IOM, or FEX) logically extends the fabric interconnects to the blade server. The best analogy is to think of it as a remote line card that’s embedded into the blade server chassis, allowing blade connectivity to the external world. I/O module settings are pushed via the UCS Manager and not managed directly. The primary functions of this module are to facilitate blade server I/O connectivity (internal and external), multiplex all I/O traffic up to the fabric interconnects, and help monitor and manage the Cisco UCS infrastructure.
Apart from multiplexing blade ...
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