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Status Future consideration
Workspace z/OS
Categories DFSMS Utilities
Created by Guest
Created on May 17, 2018

RELATED IDEAS

Misc reporting issues with dataset compression and encryption

This RFE is submitted to request corrective actions for the following dataset compression and encryption capabilities in z/OS 2.2 and above.
Misc issues:
a) There is no documentation for SMS.IND field in IEHLIST LISTVTOC output that describes a value of ‘N' means a dataset is encrypted (learned this from crypto council presentations). IBM will include in the z/OS 2.4 documentation when published.
b) SMS.IND cannot tell whether the compression method is zEDC or Generic, only the catalog interface can show this via ACT-DIC-TOKEN. The token value of x'6001….' Is only documented in presentations and the zEDC redbook.
c) When a VSAM dataset is created using a dataclass that specifies COMPACTION(ZP), our understanding is that we are requesting zEDC compression is preferred if the dataset is eligible. Since VSAM is not eligible we would prefer that the dataset not be compressed at all however AMS will use generic compression when the dataset is opened (ACT-DIC-TOKEN x'4000…'). We do not want software compression if COMPACTION=ZP and the file is VSAM.
d) DCOLLECT versus LISTCAT – in running a DCOLLECT we see cases where a compressed dataset has a field value for DCDCMTYP that indicates the dataset is not compressed whereas LISTCAT indicates (correctly) that it is. IBM indicates DCOLLECT is not reporting correctly and we should trust LISTCAT.

Idea priority High
  • Guest
    Reply
    |     May 22, 2018

    p.s. the question on using listcat for reports was retorical if one should ask..

  • Guest
    Reply
    |     May 22, 2018

    Issues with reporting on compression have turned up too many times. What should we do, use listcat on all datasets to report the total of compression we have gained?

    Small note: missing the exact description of the enhancement, but I get the idea..

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