VELOCI-Raptor gathers information during I/O requests to VSAM and SAM (QSAM,BSAM and EXCP) data sets and uses this information to access a knowledge-base of I/O processing rules. It implements selected rules to analyze all data set information available from the catalog, control blocks and operating dynamics.VELOCI-Raptor then builds an I/O environment for each data set that maximizes processing efficiency, and it adjusts performance criteria and operating conditions based upon I/O requests.