If you are using Cisco UCS there is a very high chance that you will be using shared storage, a SAN environment. In our lab we have setup our Fabric Interconnects to connect to external fiber channel switches for our SAN connectivity. This tutorial will walk you through how to create a Virtual SAN or VSAN in your Cisco UCS infrastructure utilizing a Fiber Channel Expansion Module installed in the Fabric Interconnect along with Fiber Channel Storage switches that support NPIV (N_Port ID Virtualization).
https://sysadmintutorials.com/tutorials/cisco/cisco-ucs/cisco-ucs-fabric-interconnect-vsan-setup/