Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 1 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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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)

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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)

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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.

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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)

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

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 11 Typical online use

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. 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.