FAST is Symmetrix SOFTWARE that runs background algorithms continuously ANALYZE the utilization (busy rate) of the Symmetrix array devices. 

FAST can move the most-used data to the fastest storage, such as Enterprise Flash Drives, the least-used data to the slowest storage, such as SATA drives, while MAINTAINING the remaining data on Fibre Channel drives, based on user-defined Symmetrix tiers and FAST policies. 

The OBJECTIVE of tiered storage is to minimize the cost of storage by putting the right data, on the right Symmetrix tier, at the right time.

FAST is Symmetrix software that runs background algorithms continuously analyze the utilization (busy rate) of the Symmetrix array devices. 

FAST can move the most-used data to the fastest storage, such as Enterprise Flash Drives, the least-used data to the slowest storage, such as SATA drives, while maintaining the remaining data on Fibre Channel drives, based on user-defined Symmetrix tiers and FAST policies. 

The objective of tiered storage is to minimize the cost of storage by putting the right data, on the right Symmetrix tier, at the right time.