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Unveiling the Power of Mainframe Computing: Benefits, Workloads, and Architecture

Explore why data thrives on mainframes, the key uses, benefits, and evolving architecture. Uncover mainframe characteristics and capacities, from clustered technologies to dynamic upgrades. Discover how mainframes support massive workloads with high availability and security measures.

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Unveiling the Power of Mainframe Computing: Benefits, Workloads, and Architecture

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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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