PSA: ESX 4.x Emulex LPe12000-E, Firmware 2.00A3 not compatible with vMax

Summary:
Found this out the hard way, but for anyone who might be banging your head against the wall.  Check if your ESX host has Emulex LPe12000-E and running firmware 2.00A3.  If so upgrade to 2.00A4.

Symptoms:

1. ESX host not mapping/detecting LUN regardless of rescan attempts.
2. VM's suddenly going offline because of disk access problems.