Hot start

A hot start is performed when JES2 abnormally terminates, WARM is specified, and JES2 determines that an IPL has not occurred before restart.

You can use a hot start when JES2 has stopped, but other members have continued to function and have not experienced problems. When you hot start JES2, all address spaces continue to execute as if JES2 had never terminated. Functional subsystems will continue to process spooled output if possible before the hot start, and JES2 will reconnect to the functional subsystem (FSS) during the hot start. Hot starts do not affect other members in a multi-access spool configuration.

JES2 validates (and rebuilds when necessary) the job and output queues and the job queue index. Damaged or corrupted job output elements (JOEs) and job queue elements (JQEs) are placed on the rebuild queue.

Also, many initialization statements and parameter specifications are ignored on a hot start of JES2. (z/OS JES2 Initialization and Tuning Reference notes these parameters.)