22. The medium of claim 21, the removing of one or more cached datasets having the lowest ranks from the cache comprising: repeatedly removing a lowest ranked cached dataset from the cache and evaluating free space within the cache the until the free space satisfies a predetermined criteria.
22. The medium of claim 21, the removing of one or more cached datasets having the lowest ranks from the cache comprising: repeatedly removing a lowest ranked cached dataset from the cache and evaluating free space within the cache the until the free space satisfies a predetermined criteria. 23. The medium of claim 22, the predetermined criteria comprising the existence of a predefined relationship between the free space and occupied space in the cache.