©HCCS & IBM® 2006 Stephen Linkin

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Overview Of System Programming

Stephen S. LinkinHouston Community College

© HCCS and IBM 2006

©HCCS & IBM® 2006 Stephen Linkin

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The Role Of The System Programmer

Device I/O ConfigurationsDevice I/O Configurations Processor ConfigurationsProcessor Configurations Console DefinitionsConsole Definitions Managing System Libraries Managing System Libraries Managing System Data SetsManaging System Data Sets Customization Parameters Customization Parameters Security AdministrationSecurity Administration

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What Is Meant By Separation Of Duties? z/OS system programmer CICS system programmer Database system programmer Database administrator Network system programmer Automation specialist Security manager Hardware management Production control analyst System operator Network operator Security administrator Service manager

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Customizing The System

z/OS System Libraries

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Customizing The System

z/OS System Libraries SYS1.PARMLIB Link Pack Area (LPA) Pageable Link Pack Area (PLPA)

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Customizing The System

z/OS System Libraries SYS1.PARMLIB Link Pack Area (LPA) Pageable Link Pack Area (PLPA) Fixed Link Pack Area (FLPA) Modified Link Pack Area (MLPA)

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Customizing The System

SYS1.PROCLIB The Master Scheduler Subsystem

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Customizing The System

SYS1.PROCLIB The Master Scheduler Subsystem A Job Procedure Library

/*JOBPARM PROCLIB=/*JOBPARM PROCLIB=/*JOBPARM PROCLIB=PROC99/*JOBPARM PROCLIB=PROC99

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Customizing The System

SYS1.PROCLIB The Master Scheduler Subsystem A Job Procedure Library Search Order For Programs

Job pack area (JPA) TASKLIB3 STEPLIB or JOBLIB LPA Libraries In The Linklist

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Customizing The System

What System Symbols Are

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Managing System Performance

Iterative And Continuous Process Distribution Of Available Resources

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Configuring I/O Devices

More Than Plug and Play

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Following A Process Of Change Control

Factors Considered For Changes: The Benefits The Resources Required The Relative Importance Interdependency Of Changes

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Following A Process Of Change Control

Factors Considered For Changes: The Benefits The Resources Required The Relative Importance Interdependency Of Changes

Risk Assessment Change Control Record System

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Following A Process Of Change Control

Factors Considered For Changes: The Benefits The Resources Required The Relative Importance Interdependency Of Changes

Risk Assessment Change Control Record System Production Control

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Configuring Consoles

What Are Consoles?

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Configuring Consoles

What Are Consoles? How Do We Set Them Up?

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Configuring Consoles

What Are Consoles? How Do We Set Them Up? Types Of Consoles

(MCS) consoles (SMCS) consoles (EMCS) consoles

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Configuring Consoles

What Are Consoles? How Do We Set Them Up? Types Of Consoles

(MCS) consoles (SMCS) consoles (EMCS) consoles

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Initializing The System

Why An Initialization Process What Is Needed

The Device Address Of The IPL Volume The Loadxx Member Containing Pointers

To System Parameters The IODF Data Set Containing

Configuration Information The Device Address Of The IODF Volume

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Initializing The System

Initialization Process System And Storage Initialization Master Scheduler Initialization

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Initializing The System

Initialization Process System And Storage Initialization Master Scheduler Initialization

Significant Tasks Performed By IRIMS Read The LOADPARM Information Search The Volume Specified By LOADPARM For The

IODF Data Set Load The Operating System’s Nucleus Initialize virtual storage master scheduler address space Initialize real storage management

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Initializing The System

Initialization Process System And Storage Initialization Master Scheduler Initialization

NIP carries out the major functions Expands the SQA and extended SQA Creates the PLPA and extended PLPA Loads modules into FLPA or extended FLPA Loads modules into MLPA and extended MLPA Allocates virtual storage for the CSA and extended CSA

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Initializing The System

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Initializing The System

Initialization Process System And Storage Initialization Master Scheduler Initialization

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Initializing The System

IPL Types Cold start Quick start Warm start

Shutting Down The System

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Summary

Read The Redbook