Learn about the three JES2 startup processes – cold start, warm start, and quick start. Understand the differences between each type of JES2 startup and when they are used.
Table of Contents
Question
What are types of Jes2 start up [ Startup process ].
A. Cold, Warm, Memory
B. Cold, Warm, Immediate
C. Cold, Quick, Immediate
D. Cold, Warm, Quick
Answer
D. Cold, Warm, Quick
Explanation
The three types of JES2 startup processes are:
- Cold start
- Warm start
- Quick start
A cold start is performed when JES2 is started for the first time or after JES2 has been completely stopped and all of its resources and structures need to be rebuilt from scratch. During a cold start, JES2 re-initializes all of its control blocks, I/O devices, and other structures. Job queue elements and output queue elements are reloaded from DASD using the checkpoint data sets.
A warm start is done when JES2 is restarted after an orderly shutdown, either planned or due to a system failure. During a warm start, JES2 restores its state from the last successful checkpoint. Most JES2 structures and resources remain intact and jobs that were in progress can resume processing from where they left off.
A quick start is a special type of warm start where the job queue is rebuilt from the checkpoint data sets, but the output queues are not reloaded. Quick start is faster than a regular warm start. However, any SYSOUT data created by jobs before the quick start is lost and must be recreated. Quick start is normally used only for disaster recovery or other special situations.
In summary, the three types of JES2 startup processes are cold start, warm start, and quick start. The type of start performed depends on the state of the system and reason for the JES2 restart. Cold start rebuilds everything, warm start resumes using checkpointed data, and quick start is a faster warm start that only restores the job queue.
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