If you have used VMware VI3 and vSphere 4, one thing you probably noticed right away is the difference in licensing. To much applause, vSphere no longer uses a FLEXlm license server.
While you transition from VI3 to vSphere you will still need to keep the license server around, though. Fortunately vCenter Server 4 is fully equipped to handle the task of pointing your ESX 3 hosts to the appropriate licensing source.
Behind the Scenes
The new architecture is a welcome change, but internally it was always very convenient to point to a central license server to quickly set up new VC and ESX systems. Take a look at this vCenter Server licensing report — pointing to one of the internal VMware servers with one million licenses of ESX Standard.
Are you going to miss FLEXlm? I’m not.