VNX FAST Cache, a part of the VNX FAST suite, enables Flash drives to be used as an
expanded cache layer for the array. FAST Cache eliminates the impact of slow storage by accelerating the read/write response time of active data. In a DTaaS environment, frequently accessed data such as VMware View replicas and linked clones migrate to
Flash drives. This enables rapid response to boot storms, anti-virus scans, and any I/O intensive workloads such as operating system patches and application updates.
FAST Cache has array-wide features available for both file and block storage. 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 that data chunk are serviced by FAST Cache. This allows immediate
promotion of very active data to the Flash drives, which dramatically improves the
response time for very active data and reduces the data hot spots that can occur within the LUN.