Depending on what you are asking:
If you want to know what blades are pinned out a particular eth uplink in a FI, issue the following command from nxos cli on UCSM/FI:#show pinning border-interfaces active.
This will show 'Veths' that are pinned to a physical port (or the port channel). Take the Veths, and do #show int vethxxxx
The 3rd line down in output will have "Port Description is server x/y, VNIC abc", so you will know which blade or rack server(s) are utilizing this particular uplink.
Blades will be reference with x/y numbering, where as rack servers will just be referenced as server x.
You need to figure out what kind of CNA is installed in a server, as to whether it supports FCOE, and if the upstream switch has FCOE support.
Thanks,
Kirk...