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Main Frame Computing Objectives

Main Frame Computing Objectives. Explain why data resides on mainframe 60% of all data 80 % of Internet Data List typical uses of mainframes Describe the benefits of mainframe computing Outline the major workloads for mainframes. Mainframe Characteristics.

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Main Frame Computing Objectives

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  1. Main Frame ComputingObjectives • Explain why data resides on mainframe 60% of all data 80 % of Internet Data • List typical uses of mainframes • Describe the benefits of mainframe computing • Outline the major workloads for mainframes

  2. Mainframe Characteristics • Centralized control of resources • HW and operating systems share disk access • A STYLE of operation -2 tier computing (logic and data on host) • Thousands of simultaneous I/O operations • Clustering technologies • Data and resource sharing capabilities

  3. What is a mainframe ? Businesses use mainframes to host: -commercial databases, -transaction servers, and -applications that require a greater degree of security and availability - growing workload from Mobile and Cloud

  4. Evolving Mainframe Computer Architecture • More and faster processors... MIMD • More physical memory and greater virtual memory capability • Dynamic capabilities for upgrading HW and SW • Enhanced I/O devices and more and faster paths (channels) • Increased ability to divide resources into multiple, logically independent and isolated systems (LPAR) • Enhanced clustering technologies (e.g. Parallel Sysplex)

  5. The Size/Capacity of Mainframes A Sample Single System Configuration: - 8 TPF (OS) Images - Mainframe box with 12 CPUs (I-streams) and - 32 GB of memory - shared database of 2,500 Disks with 40 Disk control units - 2 tape robots used primarily for logging

  6. The Size/Capacity of Mainframes Some Performance numbers for that configuration: - 2 million real I/Os per second to Disk during peak hours - over 100,000 transactions per second during peak hours. - 3,380,000,000 (3.38 billion) transactions in 24 hours CPU capacity complex to execute over 68 billion instructions per second (68,000 MIPS)

  7. Availability An installation quote: "It has been 4,567 days since the last customer visible outage." It is now eight months later so the count is now over 13 years without a customer visible outage.

  8. Mainframe facts Mainframes in our midst • Hidden from the public eye – background servers 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 • Terabytes of information in databases • Large-bandwidth communications

  9. Factors contributing to mainframe use -Capacity -Scalability -Integrity and Security -Availability -Access to large amounts of data -Systems management -Autonomic capabilities (dynamic self management)

  10. Typical batch use

  11. Typical online use

  12. Summary The New Mainframe: • Plays a central role in the daily operations of the world’s largest organizations • Is known for its reliability, security, and enormous processing capabilities. • Is designed for processing large scale workloads, with thousands of users, and concurrent transactions • Is managed by highly skilled technical support staff. • Runs a variety of operating systems.

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