If its a 4 port FC module, you can't just plug it in. You have to use the USM, and plug it in when it tells you to. I assume that you're direct connecting into the Fabric Interconnects, i.e. not going via fabric switches.  This is only supported by Cisco UCS firmware 2.1 and higher. Another thought, can you see light into your fiber cable from both ends and are the fibers round the right way?  Good luck
I have a VNX5400 storage system directly connected to a Cisco network device via FC ports and optic cables. The links don't come up. Status of the Cisco devices ports is "Link down", their LEDs are dark, but green LEDs are lit under the VNX FC ports. However, the status of those ports in the Unisphere Manager is "Uninitialized".  The question is, how can I view more detailed status of the FC ports on the VNX system? And what can I check to determine the cause of the problem? Maybe I should somehow initialize the FC ports on the VNX system?  Additional information: * the latest firmware is installed in the VNX system; * the unified communication ports on the Cisco devices (Cisco blade interconnects 6248UP) are designated as FC Storage ports; * 8 Gbit/s FC SFPs are used in both the systems; * the FC modules in the VNX system weren't a part of the initial system configuration, they were added later.  I suspect that the case of this issue is wrong optic cables used to connect the devices. But right now I have no replacement cables. Any other ideas?
VNX5400: cannot connect