Just a warning about upgrading or testing ESXi 5.0 on (older) servers with Emulex LP10000-S.
(This FC card is not on the HCL list for both Vmware 4 and 5).
I have two servers with this working fine with ESXi 4.1 and they could see the storage.
After upgrading (or even installing a new one) the ESXi reports "Mgmt IO is Blocked d00 - mbox cmd 5 still active..." and you don't have any connectivity to the SAN.
Reinstalling ESXi 4.1 solved the problem