Discover the key resources managed by JES2 in mainframe systems. Learn about initiators, printers, and spools, and find out why CPU is not considered a JES2 resource.
Table of Contents
Question
Which of the following is not a JES2 resource
A. Initiator
B. Printer
C. Spool
D. CPU
Answer
D. CPU
Explanation
JES2 (Job Entry Subsystem 2) is a component of the z/OS operating system that manages batch jobs and system resources. However, the CPU (Central Processing Unit) itself is not directly managed by JES2. Instead, JES2 manages the following resources:
- Initiators: These are the processes that start and manage batch jobs. JES2 controls the number of initiators and assigns jobs to them based on job class and priority.
- Printers: JES2 manages the output processing for printers, including the scheduling and routing of print jobs.
- Spool: JES2 manages the spool (Simultaneous Peripheral Operations Online) space, which is used for temporary storage of input and output data for batch jobs.
While the CPU is a critical resource in mainframe systems, it is managed by the z/OS operating system and the Workload Manager (WLM), not directly by JES2. The CPU is responsible for executing instructions and processing data, but JES2 focuses on managing the batch job environment and its associated resources.
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