This volume provides up-to-date information on how to manage data storage with IBM and IBM-compatible mainframe systems running under MVS, VM and other operating systems. Among the topics addressed by the book are channel architecture from bus-and-tag (copper) architecture to ESCON (fibre optic channels) and control unit operation; DASD configuration, installation and usage on a day-to-day basis, including useful tips on system management; tuning DASD systems, including I/O specifics, job control considerations and applications programming tips; resource sharing for the large data processing environment; and dynamic DASD configuration under ESA/390 architecture.