JES2 Implementation & Customisation

Objectives
On successful completion of this course, attendees will be able to:

• describe how JES2 works within MVS
• control the start and stop processes of JES2
• describe the JES2 functions and facilities
• set up and install an efficient JES2 system
• dynamically change JES2 parameters
• customise JES2 to your specific requirements
• set up and manage the RJE and NJE environments.

Who Should Attend
The course is primarily designed for experienced z/OS Systems Programmers.
Prerequisites
A knowledge of z/OS concepts, JCL and utilities.
Duration
3 days

Course Code
2024
Contents
z/OS and JES2 - how they relate
IPL of the operating system; starting and initiating JES2; starting other functions; stopping JES2 and z/OS.


Starting and stopping z/OS JES2
The hardware; Architectural requirements; IBM's mainframe computer architecture; Standard address spaces in MVS; MVS overview; JES2 and Job Management; Job Management; The JES2 functions; JES2 components; Parameters for JES2; The Operator and the Three Phases; Operator communications.


Starting and Stopping z/OS JES2
Starting and initiating JES2; Starting JES2; JES2 start parameters; Default JES2 start parameters; JES2 Initialisation parameters (JES2PARM); Activating JES2; JES2 cold start; JES2 warm starts; Example of JES2 warm start; Starting other functions; Stopping JES2; Stopping JES2 - 'crash landing'; Accidental crash landing of JES2; Message $HASP095; JES2 termination codes.


z/OS Workload & the Active System
Program execution environments; Batch processing; Started Tasks; Time Sharing Option (TSO); Executing program requirements; Program identification With JCL; All the JCL statements; The most used JCL statements; JES2 and JES3 statements; Relationships between JCL statements; Getting work into the system; Getting a started task into the system; Getting a TSO user into the system; Getting a Batch Job into the system; Batch Job Queues; Job initiation; Step initiation; The job schedule; Reports and listings; Standard reports; Job Log examples; The active system; What is a batch job?; JES2 information in the job stream; A Job's phases; What is a System Task?; What is a TSO logon?.


JES2 Processors & Subsystem Interface
JES2 Job Processing; Input Processor; Converter Processor; Execution Processor; Output Processor; Why the Subsystems Interface (SSI)?; Subsystem Interface; Using SSI; Using the Subsystem Interface; Requesting SS service; Defining subsystems; Control block definitions; What the function IDs represent.


JES2 Installation - Part 1
JES2 installation components; JES2 load modules; JES2 libraries; IBM-supplied basic JCL procedure; Subsystem definition; PROCLIB & INCLUDE; JES2 data sets; Allocating Spool and Checkpoint; Program Properties Table (PPT); Secondary subsystems; Defining Secondary Subsystems.


JES2 Installation - Part 2
JES2 initialization flow; Types of JES2 start; Specifying type of JES2 startup; JES2 start options; Initialization parameter format; JES2PARM; Console statements; Key initialization statements; SPOOLDEF; CKPTDEF; MASDEF; MAS display commands; INITDEF and INITnnn; JOB/STC/TSUCLASS; ESTLNCT; CONDEF; PCEDEF; JES2 Monitor.


Input & Conversion Processors
Processes and Queues; Input processing; Job Queue; Job Queue Element (JQE); Job Control Table (JCT); Input Output Table (IOT); Peripheral Data Set Definition Block (PDDB); Input Processing Control Blocks overview; Controlling input processing; Internal readers; Job characteristics; Conversion process.


Checkpoint & Spool Processing
Checkpointing; Checkpoint layout; Duplex Mode; Dual Mode; Checkpoint recovery; Checkpoint changes; JES2 Spool Management; Spool Volumes (SPOOLDEF); SPOOL fencing; Spool Affinity; Spool Track Groups; Allocating Spool; Spool status; Changing the spool configuration; Spool partitioning; Spool Offload facility; Offload Transmitters/Receivers; Controlling OFFLOAD devices; Controlling Transmitters/Receivers; Offload data set; Specifying the JOB Transmitter/Receiver; Specifying the SYSOUT receiver; Specifying the SYSOUT transmitter; Review tasks.


JES2 Exits
What are JES2 Exits?; Uses for JES2 Exits; IBM-supplied JES2 Exits Points; Defining and controlling Exits; JES2 EXIT initialization; Calling environment; Linkage and Return Codes; Exit coding and macros.


Execution Processor
Executing batch jobs - Initiators; Initiator management; Execution Processor; Executing in z/OS - the address space; Execution - the initiators; Batch Initiators; JES2 and Initiators; Controlling initiators; Jobs in z/OS; Active jobs; DISPLAY active jobs; Cancelling jobs; The $C command; ZAPJOB.


Output & Purge Processor
Output processing; Print/Punch processor; Output services; Output group; Demand set-up; Work selection criteria; Controlling output; Define local printers; Define printer globals; Output listings.


RJE and NJE
Remote Job Entry (RJE); Network Job Entry; NJE routing; SNA example; Who is in the Network?; Path resistance; Resistance computation.