Recommendations

Consider these recommendations:

• Use the EQQUX002 exit to locate the JCL in cases where there are many libraries concatenated on EQQJBLIB and the target library is predictable, perhaps according to the workstation name, or jobname, for example.
• Concatenate only libraries of interest to HCL Workload Automation for Z on EQQJBLIB. Ensure the libraries are concatenated in frequency order. That is, if more than 50% of the JCL is stored in one library, that library should be the first concatenated on EQQJBLIB. If facilities are available, keep the directories for these libraries in storage.
• Defining FREESPACE on the JCL repository (EQQJS1DS and EQQJS2DS) is essential.
• Examine the performance of EQQUX001, EQQUX002, and EQQUX013, if used. The current plan lock is held while the three exits are called, performance is critical.
• Use VARSUB(SCAN) instead of VARSUB(YES) when JCL tailoring is required.
• If there are often many ready operations to be started, consider setting a higher QUEUELEN value. Once the WSA has the lock, submissions are handled very quickly. A well-tuned system can submit tens of operations per second.
• Examine JES performance, particularly on checkpoint data set, because this greatly affects the internal-reader submit time.