SPOOL volume configuration, control, and performance

The spool is the repository for all input jobs and all system output (SYSOUT) that JES2 manages. SYS1.HASPACE (the data set used for storing JES2–maintained data and control blocks) is a JES2-required data set. Note that the name, SYS1.HASPACE, is the JES2 default name for the required spool data set. If you prefer, change this name by specifying the DSNAME= parameter on the SPOOLDEF initialization statement. However, for convenience of this discussion, we will use the default name here. The specification, management, and placement of this data set affects JES2 performance. This topic deals with the management of spool data sets, including their specification and important performance considerations.