1. A method for managing data within a Redundant Array of Independent Disks (RAID) array utilizing a RAID controller including an extended cache, comprising: storing contentual metadata of the extended cache within the extended cache; approximating contentual metadata of the extended cache utilizing a counting Bloom filter; storing the counting Bloom filter within a primary cache; storing contentual metadata of the primary cache within the primary cache; and executing one of a data read or a data write without accessing the contentual metadata of the extended cache stored within the extended cache, wherein a first data set is not stored within the primary cache, the first data set associated with a location of the RAID array addressed by at least one of the data read or the data write.