1. Introduction to the new mainframe: Large-Scale Commercial Computing © Copyright IBM Corp., 2006. All rights reserved. Chapter 1: The new mainframe

2. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 2 Chapter 1 objectives Be able to: Explain why business data resides on mainframe List typical uses of mainframes Describe the benefits of mainframe computing Outline the major types of workloads for which mainframes are best suited

3. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 3 What is a mainframe ? A mainframe is what businesses use to host their commercial databases, transaction servers, and applications that require a greater degree of security and availability than is commonly found on smaller- scale machines.

4. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 4 What is a mainframe? (Cont…)  Compatibility with operating systems, applications and data  Centralized control of resources  HW and operating systems share disk access  A STYLE of operation  Thousands of simultaneous I/O operations  Clustering technologies  Additional data and resource sharing capabilities

5. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 5 Evolving architecture  More and faster processors  More physical memory and greater virtual memory addressing capability  Dynamic capabilities for upgrading HW and SW  Enhanced I/O devices and more and faster paths (channels)  Sophisticated I/O attachments  Increased ability to divide resources into multiple, logically independent and isolated systems, each running its own operating system.  Enhanced clustering technologies (e.g. Parallel Sysplex) Architecture describes the organizational structure of a system

6. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 6 Mainframe facts Mainframes in our midst Hidden from the public eye Who uses mainframes? Most Fortune 1000 companies use a mainframe environment 60% of all data available on the Internet is stored on mainframe computers Why mainframes? Large-scale transaction processing  Thousands of transactions per second Support thousands of users and application programs Simultaneously accessing resources Terabytes of information in databases Large-bandwidth communications

7. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 7 Factors contributing to mainframe use  Capacity  Scalability  Integrity and Security  Availability  Access to large amounts of data  Systems management  Autonomic capabilities

8. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 8 Typical mainframe workloads

9. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 9 Typical batch use

10. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 10 Typical online use

11. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 11 Summary The New Mainframe: Plays a central role in the daily operations of the world’s largest organizations – and the daily lives of most people. Is known for its reliability, security, and enormous processing capabilities. Is designed for processing large scale workloads and serving thousands of users and transactions concurrently. Is managed by highly skilled technical support staff. Runs a variety of operating systems.

12. Introduction to the new mainframe © Copyright IBM Corp., 2006. All rights reserved. 12 Key terms Architecture Batch Processing Compatibility Data integrity High Availability IBM System z Infrastructure Mainframe Online transaction processing (OLTP) Punched card RAS Scalability Security