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MAXJSFILE(NO|maximum size of JS data set|0)
Tivoli Workload Scheduler for z/OS uses a primary and alternate data set for the JCL repository. Tivoli Workload Scheduler for z/OS reorganizes the JCL repository data set that is in use by copying it to the inactive data set and then switching to the newly copied data set. The value you specify on the MAXJSFILE keyword defines whether the JCL repository should be automatically copied and determines how frequently the automatic copy process should occur.
Specify a maximum size if you want Tivoli Workload Scheduler for z/OS to copy automatically. This value also defines how large the current JCL repository data set is allowed to become before it is automatically copied to the alternate data set. The size must be specified in kilobytes (1KB equals 1024 bytes). The maximum value you can specify is 2 097 000 kilobytes. Any greater value will give unpredictable results. The value specified is converted into cylinders and rounded to the next whole number. Any value equivalent to less than 2 cylinders (other than the default value) is set to 2 cylinders. If you do not specify MAXJSFILE or specify the default value 0, Tivoli Workload Scheduler for z/OS will perform a copy after the first 50 jobs have been inserted since it was started. The size of the data set (converted into cylinders) after this first copy, plus the equivalent of one cylinder, is then used as the value for MAXJSFILE. After every 50 inserts, Tivoli Workload Scheduler for z/OS checks the size of the JS file using an algorithm that is based on the high_used_RBA. If the high_used_RBA is equal to or greater than the value of MAXJSFILE, a copy is performed.
Specify NO if you do not want Tivoli Workload Scheduler for z/OS to copy automatically. If you specify NO, ensure that you request backups at regular intervals, depending on the workload at your installation. You can request that Tivoli Workload Scheduler for z/OS performs a copy process using the BACKUP command or EQQUSIN or EQQUSINB subroutine, regardless of the value specified on the MAXJSFILE keyword. Refer to Managing the Workload for more information about the BACKUP command. |
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