1 Introduction To The New Mainframe Stephen S. Linkin Houston Community College ©HCCS & IBM® 2008 Stephen Linkin

2 The New Mainframe  Mainframe Computers Play A Central Role In Daily Operations  Coveted Place In Today’s E-business Environment. Banking, Finance, Healthcare, Insurance, Public Utilities, Government  Mainframe Computing Dominates Large- Scale Business Computing.

©HCCS & IBM® 2008 Stephen Linkin3 The New Mainframe  70% of all web pages are stored on mainframe systems  Transaction Processing is a Prime use.

©HCCS & IBM® 2008 Stephen Linkin4 The S/360: A Turning Point In Mainframe History  IBM 701 Circa 1951  Univac System Circa 1950  IBM 1401 Circa 1956  IBM 360 Circa 1964

©HCCS & IBM® 2008 Stephen Linkin5 The S/360: A Turning Point In Mainframe History  A Series Of Generations First Generation Systems – 1951 Second Generation – 1956 Third Generation

©HCCS & IBM® 2008 Stephen Linkin6 The S/360: A Turning Point In Mainframe History  Standardized Mainframe Computers Microcode  Corrections Or New Functions Can Be Implemented By Updating  No Concern Over Compatibility Standardized Languages  Assembler, COBOL, FORTRAN, PL/1

©HCCS & IBM® 2008 Stephen Linkin7 The S/360: A Turning Point In Mainframe History  Standardized Software Utilities

©HCCS & IBM® 2008 Stephen Linkin8 An Evolving Architecture  Definition Of Architecture

©HCCS & IBM® 2008 Stephen Linkin9 An Evolving Architecture  More And Faster Processors  More Physical Memory And Greater Memory Addressing Capability  Dynamic Upgrading Of Hardware And Software  Automation Of Hardware Error Checking And Recovery

©HCCS & IBM® 2008 Stephen Linkin10 An Evolving Architecture  Enhanced (I/O) More And Faster Channels  Sophisticated I/O Attachments, E.G. LAN Adapters  Ability To Divide Resources Of One Machine Into Multiple, Isolated Systems, Running Its Own OS  Advanced Clustering, Parallel Sysplex, That Share Data Among Multiple Systems.

©HCCS & IBM® 2008 Stephen Linkin11 An Evolving Architecture  Stable  Secure  Compatible

©HCCS & IBM® 2008 Stephen Linkin12 Mainframes In Our Midst  Mainframes Are Largely Invisible  They Are Resistant To Viruses And Trojan Horses.  They Share Space With Other Hardware Devices: External Storage Devices Hardware Network Routers Channel Controllers Automated Tape “Robots”

©HCCS & IBM® 2008 Stephen Linkin13 What Is A Mainframe?  The Largest Servers Server Farms  Networked Servers  Central Data Repository  Platform  The Single Box…

©HCCS & IBM® 2008 Stephen Linkin14 What Is A Mainframe?  Style Of Operation Hosting Commercial Databases Transaction Servers Applications Requiring A Great Degree Of Security

©HCCS & IBM® 2008 Stephen Linkin15 What Is A Mainframe?  Style Of Operation Compatibility Centralized Control Of Resources Shared Access To Disk Drives On Other Systems

©HCCS & IBM® 2008 Stephen Linkin16 What Is A Mainframe?  Style Of Operation Dedicated Operations Staff S.O.P  Clustering Technologies Parallel Sysplex

©HCCS & IBM® 2008 Stephen Linkin17 Who uses mainframe computers?  Everyone Perform large-scale transaction processing (thousands of transactions per second) Support thousands of users and application programs concurrently accessing resources Manage terabytes of information in databases Handle large-bandwidth communication  The roads of the information superhighway often lead to a mainframe.

©HCCS & IBM® 2008 Stephen Linkin18 Factors contributing to mainframe use  Reliability, Availability, Serviceability  Security  Scalabilty  Continuing Compatibility  Evolving Architecture

©HCCS & IBM® 2008 Stephen Linkin19 Factors contributing to mainframe use  Reliability, Availability, Serviceability

©HCCS & IBM® 2008 Stephen Linkin20 Factors contributing to mainframe use  Security

©HCCS & IBM® 2008 Stephen Linkin21 Factors contributing to mainframe use  Scalabilty

©HCCS & IBM® 2008 Stephen Linkin22 Factors contributing to mainframe use  Continuing Compatibility

©HCCS & IBM® 2008 Stephen Linkin23 Factors contributing to mainframe use  Evolving Architecture

©HCCS & IBM® 2008 Stephen Linkin24 Typical mainframe workloads  Batch  Interactive

©HCCS & IBM® 2008 Stephen Linkin25 Typical mainframe workloads  Batch Fig 1-2 Large Volumes Timed Activity Multiple Tasks

©HCCS & IBM® 2008 Stephen Linkin26

©HCCS & IBM® 2008 Stephen Linkin27 Typical mainframe workloads  Interactive Fig 1-3 Immediate Short Response Time Mission Critical

©HCCS & IBM® 2008 Stephen Linkin28

©HCCS & IBM® 2008 Stephen Linkin29 Roles in the mainframe world  System Programmers  System Administrators  Application Designers And Programmers  System Operators  Production Control Analysts

©HCCS & IBM® 2008 Stephen Linkin30 z/OS and other mainframe operating systems  z/OS  z/VM®  z/VSE™  Linux  z/TPF

©HCCS & IBM® 2008 Stephen Linkin31 z/OS and other mainframe operating systems  z/OS

©HCCS & IBM® 2008 Stephen Linkin32 z/OS and other mainframe operating systems  z/VM®

©HCCS & IBM® 2008 Stephen Linkin33 z/OS and other mainframe operating systems  z/VSE™

©HCCS & IBM® 2008 Stephen Linkin34 z/OS and other mainframe operating systems  Linux

©HCCS & IBM® 2008 Stephen Linkin35 z/OS and other mainframe operating systems  z/TPF

©HCCS & IBM® 2008 Stephen Linkin36 Summary  Read The Redbook