1. A computer, comprising: at least one processor; and a memory coupled to the at least one processor, wherein the memory stores instructions operable with the at least one processor to perform operations for managing changes to a cache size of a cache memory in view of attaining an optimal cache size of the cache memory, the operations including: determining an optimal cache size of the cache memory for supporting the optimal performance of a storage subsystem; and reporting any size adjustment to the cache size of the cache memory based on the determination of the optimal cache size of the cache memory to thereby facilitate a management of a client expense account associated with the cache memory.