The SUBSYS interface is the CA Spool equivalent to the JES SYSOUT and SYSIN functions. This interface allows applications to use CA Spool facilities without any modifications. IBM utilities can also use this interface.
The primary spooling system is not involved at any stage when a spool file is processed using SUBSYS. All processing is performed by CA Spool to eliminate the overhead resulting from redundant spool processing.
The SUBSYS Parameter interface allows spool files to be assigned individual file names (owner names) to make them more distinguishable.
The SUBSYS interface is activated through the SUBSYS keyword of the DD JCL statement.
The OUTPUT parameter on the DD statement is used to specify various file processing options.
The OUTPUT parameter on the DD SUBSYS statement can refer to any number of OUTPUT statements. A spool file will be created for each OUTPUT statement, so that each can be handled individually. However, they will share the same spool space on the spool volumes.
The SUBSYS interface offers better performance than JESTOESF, due to blocked data transfer and minimal processing overhead.
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