©HCCS & IBM® 2008 Stephen Linkin 1

z/OS Overview

Stephen S. LinkinHouston Community College

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What Is An Operating System?

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What Is z/OS?

Hardware Resources Used By z/OS The Standard Reference For Descriptions

Of The Major Facilities of z/Architecture is the IBM’s z/Architecture Principles of Operation.

http://www.ibm.com/servers/eserver/zseries/zos/bkserv/

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What Is z/OS?

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What Is z/OS?

Multiprogramming And Multiprocessing

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What Is z/OS?

Modules And Macros

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What Is z/OS?

Control Blocks System-related control blocks Resource-related control blocks Job-related control blocks Task-related control blocks

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What Is z/OS?

Physical Storage Used By z/OS

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Overview Of Z/OS Facilities

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Virtual Storage And Other Mainframe Concepts

What Is Virtual Storage?

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Virtual Storage And Other Mainframe Concepts

What Is An Address Space? Address Space Isolation

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Virtual Storage And Other Mainframe Concepts

What Is An Address Space? Address Space Isolation Address Space Communication

http://www.ibm.com/servers/eserver/zseries/zos/bkserv/

©HCCS & IBM® 2008 Stephen Linkin 13

Virtual Storage And Other Mainframe Concepts

What Is An Address Space? Address Space Isolation Address Space Communication

What Is Dynamic Address Translation? Virtual Storage Overview

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Virtual Storage And Other Mainframe Concepts

What Is An Address Space? Address Space Isolation Address Space Communication

What Is Dynamic Address Translation? Virtual Storage Overview

Format Of A Virtual Address

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Virtual Storage And Other Mainframe Concepts

What Is An Address Space? Address Space Isolation Address Space Communication

What Is Dynamic Address Translation? Virtual Storage Overview

Format Of A Virtual Address

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Virtual Storage And Other Mainframe Concepts

Virtual Storage Overview Format Of A Virtual Address How Virtual Storage Addressing Works In

z/OS

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Virtual Storage And Other Mainframe Concepts

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Virtual Storage And Other Mainframe Concepts

Virtual Storage Overview Format Of A Virtual Address How Virtual Storage Addressing Works In

z/OS Frames, Pages, And Slots

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REAL VIRTUAL

Virtual Storage And Other Mainframe Concepts

What Is Paging? How Paging Works In z/OS

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Virtual Storage And Other Mainframe Concepts

What Is Paging? How Paging Works In z/OS Page Stealing Unreferenced Interval Count

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Virtual Storage And Other Mainframe Concepts

Swapping And The Working Set What Is Storage Protection?

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Virtual Storage And Other Mainframe Concepts

Swapping And The Working Set What Is Storage Protection?

How Storage Protect Keys Are Used

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Virtual Storage And Other Mainframe Concepts

Swapping And The Working Set What Is Storage Protection?

How Storage Protect Keys Are Used How Storage Protect Keys Are Assigned

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Virtual Storage And Other Mainframe Concepts

Role Of Storage Managers Real Storage Manager Auxiliary Storage Manager Virtual Storage Manager

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Virtual Storage And Other Mainframe Concepts

A Brief History Of Virtual Storage And 64-bit Addressability

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Virtual Storage And Other Mainframe Concepts

A Brief History Of Virtual Storage And 64-bit Addressability

©HCCS & IBM® 2008 Stephen Linkin 27

Virtual Storage And Other Mainframe Concepts

A Brief History Of Virtual Storage And 64-bit Addressability

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Virtual Storage And Other Mainframe Concepts

What Is “Below-the-line Storage”?

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Virtual Storage And Other Mainframe Concepts

What’s In An Address Space?

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Virtual Storage And Other Mainframe Concepts

System Address Spaces And The Master Scheduler

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What Is Workload Management?

What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time

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What Is Workload Management?

What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time

How Is WLM Used?

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What Is Workload Management?

What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time

How Is WLM Used?

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I/O and data management

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Supervising Execution Of Work In The System

Tasks Involved Interrupt processing Dispatchable Units Of Work Dispatching Work Serializing Use Of Resources

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Supervising Execution Of Work In The System

What Is Interrupt Processing? SVC I/O External Restart Program Machine Check

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Supervising Execution Of Work In The System

What Is Interrupt Processing? How Is The Program Status Word Used?

Current PSW New PSW Old PSW

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Supervising Execution Of Work In The System

What Is Interrupt Processing? How Is The Program Status Word Used?

Current PSW New PSW Old PSW

Registers And The PSW

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Supervising Execution Of Work In The System

Creating Dispatchable Units Of Work What Is A TCB?

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Supervising Execution Of Work In The System

Creating Dispatchable Units Of Work What Is A TCB? What Is An SRB?

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Supervising Execution Of Work In The System

Preemptable Versus Non-preemptable What Does The Dispatcher Do?

©HCCS & IBM® 2008 Stephen Linkin 42

Supervising Execution Of Work In The System

Preemptable Versus Non-preemptable What Does The Dispatcher Do?

©HCCS & IBM® 2008 Stephen Linkin 43

Supervising Execution Of Work In The System

Serializing The Use Of Resources What Is Global Resource Serialization?

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Supervising Execution Of Work In The System

Serializing The Use Of Resources What Is Global Resource Serialization? What Is Enqueuing? What Is Locking?

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Supervising Execution Of Work In The System

Serializing The Use Of Resources What Is Global Resource Serialization? What Is Enqueuing? What Is Locking?

IT’S MINE

©HCCS & IBM® 2008 Stephen Linkin 46

A Brief Comparison Of z/OS And UNIX.

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A Brief Comparison Of z/OS And UNIX.

©HCCS & IBM® 2008 Stephen Linkin 48

Summary

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