We are in the late stages of purchasing hardware for a new virtualized environment. Server and networking is straightfoward. However storage is not. We're set with EMC VNX, but the main question is with which technology? FAST cache with disk pool? OR FAST cache with FAST VP? I'm more inclined for FAST cache with a 15K disk pool. However our vendor is pushing FAST cache with FAST VP. I would love to hear any experiences and/or suggestions. Thanks in advance!