System and method for implementing SSD-based I/O caches

摘要

A method for caching a data block stored on a first storage device and onto a second storage device including determining whether a data block being requested contains a first type of data, upon a condition in which the data block contains the first type of data, writing the data block to the second storage device and upon a condition in which the data block does not contain the first type of data, determining whether a correspondingly mapped block on the second storage device contains the first type of data, and only writing the data block to the second storage device upon a condition in which the correspondingly mapped block does not contain the first type of data.