Mainframe

5,913 views
5,664 views

Published on

Mainframes Introduction

Mainframe

  1. 1. Introduction to the new mainfame: z/OS basics Chapter 1: The new mainframe © Copyright IBM Corp., 2005. All rights reserved.
  2. 2. Introduction to the new mainframe Chapter 1 objectives Be able to: •List ways in which the mainframe of today challenges the traditional thinking on centralized computing versus distributed computing •Explain how businesses make use of mainframe processing power, the typical uses of mainframes, and how mainframe computing differs from other forms of computing •Outline the major types of workloads for which mainframes are best-suited •Name five jobs or responsibilities related to mainframe computing •List four mainframe operating systems. © Copyright IBM Corp., 2005. All rights reserved.
  3. 3. Introduction to the new mainframe Key terms in this chapter •application programmer •platform •architecture •production control •batch processing •punched card •RAS •compatibility •scalability •e-Business •server farm •EBCDIC •system administrator •high availability •system operator •infrastructure •system programmer •mainframe •transaction processing •online processing © Copyright IBM Corp., 2005. All rights reserved.
  4. 4. Introduction to the new mainframe Evolving architecture CMOS – HW S/360 S/370 S/370XA – 31 bits ESA/390 z/Architecture – 64 bits Parallel Sysplex 1964 1970 1980 1990 2000 2004 MVT, PCP MVS/ESA USS - MVS - VTAM MVS/XA z/OS MFT OS/390 TCP/IP SW Linux CICS VM DB2 WebSphere z/VM © Copyright IBM Corp., 2005. All rights reserved.
  5. 5. Introduction to the new mainframe Mainframes in our midst Mainframes: • Are prevalent, yet hidden from public eye • Not often publicized – stable, reliable, dependable. • Contrast with other forms of computing, such as PCs. • Present opportunities for college graduates in a variety of technical fields. © Copyright IBM Corp., 2005. All rights reserved.
  6. 6. Introduction to the new mainframe What is a mainframe? A mainframe is a computing system that businesses use to host the commercial databases, transaction servers, and applications that require a greater degree of security and availability than is commonly found on smaller-scale machines. The power of a mainframe provides computing speed and capacity, enabling it to perform high volumes of processing. The mainframe can process a mixed workload of jobs from different time zones and of different types. © Copyright IBM Corp., 2005. All rights reserved.
  7. 7. Introduction to the new mainframe Mainframe facts 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 There are more CICS transactions processed daily than Web pages served © Copyright IBM Corp., 2005. All rights reserved.
  8. 8. Introduction to the new mainframe Factors contributing to mainframe use RAS -- reliability, availability, serviceability Security Scalability Centralized control Workload management Partitioning / virtualization Continuing compatibility Evolving architecture Application enablement, complexity, variety Potential for thousands of users © Copyright IBM Corp., 2005. All rights reserved.
  9. 9. Introduction to the new mainframe Typical mainframe workloads Application Program Process data to Batch job Input perform a Data particular task Output Data Application Program Query Access shared data on behalf of Reply online user Online (real time) transaction © Copyright IBM Corp., 2005. All rights reserved.
  10. 10. Introduction to the new mainframe Typical batch use Residence Branch offices CREDIT CARD Main 1234 5678 9012 Account balances office VALID FROM XX/XX/XX XX/XX/XX GOOD THRU XX/XX/XX PAUL FISCHER bills, etc PAUL FISCHER 5 6 Reports Processing reports 7 Statistics, 4 summaries, exceptions 8 Mainframe Partners Processing batch jobs and clients exchange Reports information 2 1 Reports Backup s 3 Data update Tape Storage 10 Sequential 9 data sets Disk Storage Production System databases Control Operator © Copyright IBM Corp., 2005. All rights reserved.
  11. 11. Introduction to the new mainframe Typical online use ATMs Account activities SNA or TCP/IP 4 1 network Requests Branch office Branch automation offices systems 2 Mainframe 3 Accesses database Office automation 5 systems queries 6 and updates Central office Business analysts Inventory control Disk storage controller Stores database files © Copyright IBM Corp., 2005. All rights reserved.
  12. 12. Introduction to the new mainframe Roles in the mainframe world Roles Application Production Control Analyst Developer Operator End User System Programmer System Administrator © Copyright IBM Corp., 2005. All rights reserved.
  13. 13. Introduction to the new mainframe Mainframe operating systems z/OS z/VM VSE Linux for zSeries z/TPF © Copyright IBM Corp., 2005. All rights reserved.
  14. 14. Introduction to the new mainframe 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. © Copyright IBM Corp., 2005. All rights reserved.

×