Need help with Celerra fiber connection to ESX.

it's a fibre-enabled unit ? Can you run "/nas/sbin/model". Fibre-enabled unit will have FC on the end. If it is, then you will need to create luns, storage groups ..etc from Navisphere Manager.

yes, if you are using the FC ports on the NS-120 then you are indeed using the native Clariion FC and need to use the Clariion NaviSphere Manager GUI

Take a look at the TechBooks on Powerlink - they contain good setup and config information for VMWware connectivity options

see Powerlink Home > Support > Technical Documentation and Advisories > TechBooks

TechBook: VMware ESX Server Using EMC Celerra Storage Systems
This EMC Engineering TechBook describes how VMware ESX Server works with EMC Celerra storage systems and software technologies. This guide is intended for storage administrators, system administrators, and ESX Server administrators. It can also be used by individuals who are involved in acquiring, managing, or operating Celerra storage arrays and host devices
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/Technical_Documentation/H5536-vmware-esx-srvr-using-emc-celerra-stor-sys-wp.pdf

TechBook: VMware ESX Server Using EMC CLARiiON Storage Systems
This TechBook describes how the VMware ESX Server works with EMC CLARiiON storage systems and software technologies. This document focuses on the integration of VMware ESX Server with CLARiiON disk arrays, EMC MirrorView, EMC SnapView, and EMC SAN Copy
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/Technical_Documentation/H2197-vmware-esx-clariion-stor-sys-sg.pdf

There's also some white papers and best practices in
Powerlink Home > Products > Hardware/Platforms > CLARiiON > CLARiiON CX4 Series > White Papers