PXX vs SYSOUT Datacom MUF Startup Option
Article ID: 18269
Updated On:
Products
Issue/Introduction
There is a Multi-User Facility (MUF) Startup Option called SYSOUT that looks to stop the Datacom MUF from writing to the PXX statistics file. Should the PXX or the SYSOUT be used?
Resolution
The PXX is a legacy concept that can still exist today, but a best practice is to replace its functionality with the SYSOUT option. The recommendation is to use NO_PXX in the MUF JCL along with the SYSOUT MUF startup option. This allows the MUF to start without opening the PXX, eliminating any I/O to the PXX and also allows to use the same PROC in a PRIMARY and SHADOW MUF.
This option has the following syntax:
Additional Information
When using a MUFPLEX, each MUF instance needs a PXX. Having many PXX areas requires DASD space that is rarely used. Using the NO_PXX option, you can avoid having a PXX for each MUF, thus reducing the amount of DASD space needed and removing any guess work on determining if the PXX size is sufficient to hold one or more Master List dumps.
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