Performance Analysis of I/O Subsystem on Large Mainframe UNIX (R) Systems
01 January 1988
Performance of computer systems is, in part, a function of the I/O subsystem. Consequently, analysis of changes to the I/O subsystem needs a robust methodology. This paper presents a methodology to determine whether a change to a system results in a statistically significant performance improvement. We demonstrate this method by analyzing the impact of IBM 3380 model K (3380K) Direct Access Storage Device (DASD) deployment and validating changes to channel command word optimization in a large UNIX (R) environment.