Johnny Zhang
In ESX 4.0 the fail over component is also a plug-in called PSP (Path Selection Plugin).
to list them you can run:

esxcli nmp psp list
Most Recently Used (MRU) — Selects the first working path discovered at system boot time. If this path becomes unavailable, the ESX host switches to an alternative path and continues to use the new path while it is available.

Fixed — Uses the designated preferred path, if it has been configured. Otherwise, it uses the first working path discovered at system boot time. If the ESX host cannot use the preferred path, it selects a random alternative available path. The ESX host automatically reverts back to the preferred path as soon as the path becomes available.

Round Robin (RR) – Uses an automatic path selection rotating through all available paths and enabling load balancing across the paths.


Note: Information based on Cormac Hogan 's storage training slides
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