Learn which JES2 start option – hot start, warm start, or cold start – preserves spool data in this expert explanation. Ace your Wipro Mainframe MySkillz Trendnxt assessment.
Table of Contents
Question
JES2 spool data can be preserved by_____________
A. Warm start
B. Hot start
C. Cold start
D. All of the above
Answer
C. Cold start
Explanation
A cold start is the only JES2 start option that preserves spool data. During a cold start, JES2 reads the checkpoint and spool data from DASD to rebuild the job queues and output queues. Spool volumes are not reformatted, so all job-related spool data is retained.
In contrast, during a warm start, only the jobs in execution are restored from the checkpoint data on DASD. Jobs that were in the input stream or awaiting output processing are not restored. Spool volumes are reformatted, causing job-related spool data to be lost.
A hot start also does not preserve spool data. In a hot start, JES2 restarts with minimal disruption using the in-storage job queues, control blocks and system data areas. It does not read checkpoint data from DASD. If the system crashed, data not yet written to DASD would be lost in a subsequent hot start.
Therefore, a cold start is the only option that fully preserves JES2 spool data from DASD. Warm starts and hot starts result in the loss of some or all spool data.
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