Configuration Best Practices › Update JES MAS Tuning

Update JES MAS Tuning

Consider updating the MASDEF specifications for Hold and Dormancy.

In a JESplex, the JES system running within a sysplex, each LPAR is called a member. For a JESplex, the SPOOL and JES Checkpoint data sets are shared among the members, which are called the Multi-Access Spool or MAS. Only one member of the MAS can hold the checkpoint at one time.

If a MAS member holds the checkpoint too long, accessing the JES2 checkpoint can cause problems. This situation sometimes slows the CA WA CA 7 Edition job submission process. See the JES2 Availability and Performance Redbook. That guide helps you determine the correct specifications based on the number of members in the MAS, and what the members are doing. The member that has the CA7ONL address space (that is, the one submitting the jobs) must have a higher Hold value than the other members. The systems with less JES2 activity can benefit by adjusting the MINDORM and MAXDORM values.

Business Value:

This best practice ensures more efficient, quicker job submission.