Learn about the $HASP message prefix and how it relates to the JES2 subsystem in IBM mainframes. Understand $HASP messages for Job Entry Subsystem 2.
Table of Contents
Question
$HASP belongs to subsystem
A. DB2
B. JES2
C. IMS
D. CICS
Answer
B. JES2
Explanation
$HASP is the message prefix used by the JES2 (Job Entry Subsystem 2) subsystem in IBM mainframes. JES2 is responsible for managing batch jobs, input/output processing, and printing on the mainframe.
Some key points about JES2 and $HASP:
- JES2 is one of two job entry subsystems available for z/OS, the other being JES3. Most mainframe shops use JES2.
- All messages issued by JES2 are prefixed with $HASP, such as $HASP373 or $HASP395 messages which indicate the status of batch jobs.
- JES2 is started automatically during z/OS initialization and runs for the duration that the operating system is active.
- In a JES2 environment, initiators are controlled by JES2. Initiators select jobs from the input queue and start them executing.
So in summary, the $HASP message prefix is specific to and indicates the JES2 subsystem, not DB2, IMS or CICS. Recognizing $HASP messages and understanding how JES2 works is an important part of mainframe operations and batch job management.
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