Parameter type: Keyword, optional

Purpose: In a JES2 system, use the SEGMENT parameter to allow part of a job’s output to be printed while the job is still executing, or to allow multiple segments of a job’s output to be printed simultaneously on multiple printers. With SEGMENT, portions of a data set are spun, one segment at a time. You determine the size of the portion with the SEGMENT parameter. SEGMENT allows you to specify the number of pages produced for a sysout data set before the system processes the segment of the data set. To count pages, JES2 uses the carriage control characters in the data that skip to channel 1.

SEGMENT is supported by JES2 only. The SEGMENT parameter applies only to line mode data sets with RECFM=A or RECFM=M. The system might suspend segmentation if it reaches the threshold for segmentation allowed by JES2. For more information on the segmentation threshold, see z/OS JES2 Initialization and Tuning Reference.