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Status Future consideration
Workspace z/OS
Categories DFSMS PDS/PDSE
Created by Guest
Created on Mar 7, 2015

RELATED IDEAS

Improved usage reporting for PDSE Hiperspaces

Provide statistics on PDSE and PDSE1 Hiperpsace memory usage to help customers understand if they would benefit from additional meomory and if the data sets using the Hiperspaces are good candidates for caching.

Currently, information is only provided in SMF records, but there are no IBM-provided tools to process those records.

And even the SMF records only report on PDSE usage at the storage class level (in the SMF Type 42 Subtype 1 record) or at the data set level (in the SMF Type 14/15 Subtype 6 records). There is no single source of information about:
- Which PDSE data sets are being cached in the Hiperspace.
- WHY are they being cached? Is it because they are in LNKLST, or because they are in LLA, or because of their MSR?
- Member level statistics, to see which are the most commonly-used members and whether they are effective users of the cache.
- Overall Hiperspace-level information about the cache hit rate for reads and writes. There is also no Hiperspace-level information about how long pages are being left in the cache before being LRUed out.

A system command similar to the D LLA,STATS command would provide customers with the information they need to optimize use of processor storage, and could be easily implemented on top of the existing D SMS,HSPSTATS command.

Idea priority Medium
  • Guest
    Reply
    |     Aug 14, 2015

    The Module Fetch Monitor (MFM) tool that is currently being maintained by Peter Relson of IBM would be a good place to start for providing a formally supported product to provide such details.

  • Guest
    Reply
    |     Mar 8, 2015

    Creating a new RFE based on Community RFE #67654 in product z/OS.

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