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Annotated Plot of z/OS Auxiliary Storage Local Page Slot Allocation Using SAS/GRAPH ® and MXG ® software

By Neal Musitano


This paper is about creating an annotated SAS/GRAPH plot of z/OS ® local page dataset slot utilization. The z/OS local page dataset slots are used by z/OS for management of system memory. The annotated plot shows the count of the local page slots defined and the number of slots that are used. A red star highlights the maximum local slot usage. Through the day, slots are used and released with copies of main memory information. For z/OS performance reasons the MXG slot utilization guideline is at or below 25%. At higher utilizations, z/OS response times can degrade. And an extreme local page slot shortage could even cause the z/OS server to crash. The data for the SAS/GRAPH plot is from the z/OS Resource Measurement Facility record type 71. The MXG performance database (PDB) stores this record information in SAS format in the PDB.TYPE71 dataset. By plotting the daily local page slot usage our z/OS system support personnel are able easily verify that no shortage exists or to research potential problems that could contribute to a shortage. Such problems could be, insufficient central storage, or not allocating enough local page datasets with sufficient slots, or perhaps an unusual condition that never released unused slots. Each problem condition may require a different technical response to resolve the problem and to prevent a system outage. SAS and SAS/GRAPH help in daily z/OS monitoring to prevent any z/OS outage from a lack of local page slots. This paper specifically details annotating z/OS RMF data in the MXG PDB.TYPE71 dataset and uses a user macro to plot the TYPE71 data variables. However, the annotated GPLOT example can be adapted to produce a variety of daily monitoring plots by using different input files and variables

Year: 2013
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