Learn about the standard start procedure for JES2 when performing an Initial Program Load (IPL) on an IBM mainframe system. Discover why a warm start is the typical approach.
Table of Contents
Question
Normal start procedure of JES2 during IPL
A. Cold start
B. Warm start
C. Hot start
D. Immed start
Answer
B. Warm start
Explanation
The normal start procedure of JES2 (Job Entry Subsystem 2) during an IPL (Initial Program Load) is a warm start.
A warm start is the standard way to initialize JES2 when IPLing a mainframe system. With a warm start, JES2 uses configuration data and job queue information saved from the previous time the system was active. This allows currently executing jobs and queued jobs to continue processing from where they left off prior to the IPL. Warm starts provide continuity between system restarts.
In contrast, a cold start would clear out all previous JES2 configuration settings, job queues, and system status, starting over from scratch. An immediate start (immed start) is only used for special situations like applying emergency fixes. And a hot start is a high availability option for quickly switching to an alternate JES2 member without reloading the operating system.
So in summary, a warm start is the typical start procedure for JES2 when IPLing the system, as it allows work to resume while preserving the state of jobs and configuration from the prior instance of JES2 and the operating system.
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