31 Chapter 31. JES2 enhancements JES2, or Job Entry Subsystem 2, is a functional extension of the HASP II program that receives jobs into the system and processes all output data produced by the job. So, what does all that mean? Simply stated, JES2 is that component of MVS that provides the necessary functions to get jobs into, and output from, the MVS system. It is designed to provide efficient spooling, scheduling, and management facilities for the MVS operating system. This chapter describes the enhancements to JES2 for z/OS V1R13, as follows: Managing data sets on volumes for the JES2 spool ­ JES2 spool migration JES2 Batch Modernization enhancements ­ JCL instream data sets in PROCs ­ Support for JOBRC ­ Evict job on a step boundary ­ SPIN any SPIN data set Enhancements to SSI in support of SDSF JES device and property SSI enhancements © Copyright IBM Corp. 2012. All rights reserved. 691