The Compaq Storage Performance Monitor (CSPM), written by Don Dupuis of Compaq Computer Corporation, is a graphical tool that monitors read and write statistics on Linux® systems. CSPM monitors the system on a per disk, per controller, and systemwide basis. CSPM gathers all the data automatically and then generates a histogram display of system throughput and of every disk and controller. By default, CSPM monitors sectors and blocks. It can also monitor IOs, merges, and reads and writes.