MAINFRAMES WHAT IS MAINFRAME Powerful computers supporting thousands

MAINFRAMES

WHAT IS MAINFRAME? • Powerful computers supporting thousands of applications, input/output devices and supporting thousands of users simultaneously.

MAINFRAME WORKLOADS • Batch Processing: a running mainframe process that does not need user interaction • Online Transaction Processing (OLTP): a running transaction process that occurs interactively with the end user

MAINFRAME OPERATING SYSTEMS Popular mainframes operating system include • z/OS • z/VM • z/VSE • Linux for z. Series • z/TPF Mainframes can run multiple combinations of operating system in the same platform.

WHO USES MAINFRAMES? • Most Fortune 500 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.

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

ADVANTAGES • Concurrent users • High Processing Speed • Storage • Multiprogramming • Multiprocessing • Security • Reliable • Batch Processing

DOMAINS • • • Banking Finance Insurance Market Research (Retail) Telecom

SO FAR • Mainframes is a very stable environment • It has been there in the Software Industry for more than 40 years • No new technology can totally replace Mainframes because of its architecture and efficiency

CURRENT TREND • Around 80% of Mainframes projects are maintenance projects • Only 20% or less are development projects • The reason being the cost factor. The hardware maintenance cost and the initial investment required is too high.

CURRENT TREND • Migration projects are the current trend in the market. • Reasons: Maintenance cost

FUTURE • A survey to determine the current demand for mainframes found that more than half of the respondents still have major applications running on mainframes.

Done by Zahra Farhood

Done by Zahra Farhood

Done by Zahra Farhood

REFERENCES • Wikipedia. (2010, April 28). Mainframe computer [Online]. Available: http: //en. wikipedia. org/wiki/Mainframe_computer • Mike Ebbers, Bill Ogden and Wayne O’Brien, “Introduction to the New Mainframe: z/OS Basics, ” International Technical Support Organization, Vol. 1, pp. 5– 710, July 2006. • IBM Systems Software Information Center. z/VM Center concepts [Online]. Available: http: //publib. boulder. ibm. com/infocenter/eserver/v 1 r 2/index. jsp ? topic=/diricinfo/vsd 0_c_zvm. html • Mike Ebbers, Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, Jerry Johnston, Wilhelm Mild et. al. , “Introduction to the New Mainframe: z/VSE Basics, ” International Technical Support Organization, Vol. 1, pp. 5– 460, March 2007. • IBM TPF Product Information Center. Introduction to the z/TPF system [Online]. Available: http: //publib. boulder. ibm. com/infocenter/tpfhelp/current/index. j sp? topic=/com. ibm. ztpfdf. doc_put. cur/gtpc 3/c 3 sysov. html • IBM, “z/Architecture Principles of Operation, ” International Technical Support Organization, Vol. 7, pp. 20– 1100, February 2008.

REFERENCES • Competition in mainframe and associated services in India.