Hello,
Is your connectivity as below?
UCS => FI => MDS => E-series
If we have the connectivity set correctly, I'd expect to see the initiators logged in to E-series controller. Do we see initiaors logged in?
If yes, ESXi host automatically performs a periodic rescan every 5 minutes and should see the LUN's if any mapped to host.
I assume you are presenting the Volume directly to the ESXi host and in that case the Host Type on Controller should be set to VMWARE for the Host.
The LUN ID of the Volume that you present to the host should be with in 255.
The NMP plugin that is used with E-Series arrays and EF-Series arrays is VMW_SATP_ALUA. Ensure the NMP claim rules configured correctly.
Do you see any errors logged in logs while do try to discover teh LUN?
Regards
Krish