The MegaRAID Advanced Software options are CacheCade 2.0 and FastPath. The MegaRAID Advanced Software options are available for the LSI2208-1GB and LSI2208-512 controllers. A special license key is required to activate them. Although the smallest configuration for the MegaRAID Advanced Software options uses two hard disks, more hard disks will normally be used so that in the event of blade servers an LSI2208-512 controller has to be used together with PRIMERGY SX980 storage blades.