EMC FAST Cache uses the SSD to add an extra layer of cache between DRAM cache and disk drives. The FAST Cache feature is available to all VNX systems. FAST Cache works by examining 64 KB chunks of data in FAST Cache-enabled objects on the array. Frequently accessed data is copied to the FAST Cache and subsequent accesses to the data chunk are serviced by FASTCache. This enables immediate promotion of very active data to the Flash drives.
This extended read/write cache is an ideal caching mechanism for the VDI environment because the desktop image and other active user data are so frequently accessed that the data is serviced directly from the SSDswithout accessing the slower drives at the lower storage tier. FASTCache can be enabled on the desktop and user data storage pools.