MVS
Year: 2010
Glossary
IPL (Initial Program Load)
z/OS initialization, or an Initial Program Load (IPL), is the act of loading a copy of the operating system from disk into the processor’s real storage and executing it. This process essentially consists of: – System and storage initialization, including the creation of system component address spaces – Master scheduler […]
JES
JES2 Start Methods
The following are the three possible JES2 start methods: 1. WARM – This is the default start method. – WARM specifies that JES2 is to continue processing jobs from where they were stopped. – If the FORMAT option was also coded, then JES2 will ignore the WARM specification and perform […]
JES
Job Processing Phases in JES2
Work to be processed by a z/OS system has to be defined using Job Control Language (JCL). JCL is used to define which program to execute, which resources to allocate, whom to notify, and so forth. This description of work is called a job. z/OS uses a Job Entry Subsystem […]
JES
What does a JES initiator do?
A JES initiator performs several functions to ensure that multiple jobs run at the same time, without conflicts. To run multiple jobs asynchronously, the system must perform a number of functions: – Select jobs from the input queues (JES does this). – Ensure that multiple jobs (including TSO users and […]