IBM z/OS manual Integrated system services

z/OS

While zSeries servers are supported by a number of dif- ferent operating systems, their most advanced features are powered by z/OS. z/OS is the foundation for the future of zSeries, an integral part of the z/Architecture designed and developed to quickly respond to the demanding qual- ity of service requirements for on demand businesses.

z/OS is the fl agship mainframe operating system based on the 64-bit z/Architecture. It is designed to deliver the highest qualities of service for enterprise transactions and data, and extends these qualities to new applications using the latest software technologies. It provides a highly secure, scalable, high technology-performance base

on which to deploy Internet and Java-enabled applica- tions, providing a comprehensive and diverse application execution environment. z/OS takes advantage of the latest software technologies: new object-oriented programming models that permit the rapid design, development and deployment of applications essential to on demand busi- nesses. It helps protect your investment in your present mainframe applications by providing options for modern- izing existing applications and integrating them with new on demand applications, all within a single image of z/OS. It provides a solid base for new applications, supporting new technologies such as Enterprise JavaBeans™, XML, HTML, and Unicode, Parallel Sysplex clustering, highly available TCP/IP networking and dynamic workload and resource balancing.

Integrated system services

z/OS helps make critical data and processing functions accessible to end users regardless of their location in the heterogeneous on demand world. The z/OS base includes z/OS Communications Server, which enables world class TCP/IP and SNA networking support, including mainframe dependability, performance, and scalability; highly secure connectivity; support for multiple protocols; and effi cient use of networking assets.

This integrated set of system services in z/OS can help a customer to focus on extracting the maximum business value from the z/OS installation. The system manages the workload, program libraries and I/O devices. Complexities are designed to be minimized and problem determina- tion is facilitated with the sophisticated recovery, reporting and debug facilities of z/OS. The z/OS operating system combines many features that change the playing fi eld of IT infrastructure design:

•Support for zSeries Application Assist Processors (zAAP), an attractively priced special processing unit that provides an economical z/OS Java language-based execution environment

•Intelligent Resource Director expands the capabilities of z/OS Workload Manager to react to changing conditions and prioritize critical business workloads.

•Support for 64-bit real memory and 64-bit virtual storage.

•A new installation and confi guration infrastructure that simplifi es the installation and confi guration of z/OS and related products.

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