Good post by the 3PARdude (thank you)
What is AO?
Adaptive Optimization (AO) is 3PAR’s disk tiering technology, which automatically moves the hottest most frequently accessed blocks to the fastest disks and at the same time moves the infrequently accessed cold blocks of data to slower disks. If you are from an EMC background AO is comparable to FAST VP, if you are from a NetApp background welcome to the brave new world of tiering.
Read on here