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Status Not under consideration
Workspace z/OS
Categories DFSMS SMS
Created by Guest
Created on Apr 6, 2021

RELATED IDEAS

DFSMS ACS &MAXSIZE for Extended Format datasets

The value for the variable &MAXSIZE in DFSMSdfp Automatic Class Selection for NON-VSAM datasets is always calculated as 1 x Primary + 15 x Secondary, + Directory if applicable.

In the case of &DSNTYPE being EXC, EXR or LIBRARY this value should be calculated based on 1 x Primary + 122 x Secondary to properly reflect their potential maximum values as already happens with VSAM. Extended Format has been around for a long time.

Also, the &NVOL value should ideally be used as part of the calculation as happens with VSAM. And the DYNVOL count in DATACLAS should be passed as an &NVOL value if not overridden in the JCL, TSO or IDCAMS statements.

Both &DSNTYPE and &NVOL can have a dramatic effect on &MAXSIZE, up to 8 x for Secondary space per volume, and that number multiplied by the volume count. So even for a 1,1TRK dataset that is a potential 51MB vs 388MB or ~87% difference.

This limits the ability to accurately decide how to manage NONVSAM datasets based on size without getting in to some convoluted and non future proofed type coding in the ACS routines using &DSNTYPE, &SECOND_QTY, &SPACE_TYPE and/or possibly &DATACLAS, if their names indicate size and dsntype.

Idea priority Medium
  • Guest
    Reply
    |     Apr 7, 2021

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/OS
    Component - DFSMS SMS
    Operating system - IBM z/OS
    Source - None

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/OS
    Component - DFSMS CVAF/DADSM
    Operating system - IBM z/OS
    Source - None

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