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Status Delivered
Workspace z/OS
Categories DFSMS HSM
Created by Guest
Created on Jan 20, 2023

RELATED IDEAS

Exploit 64-bit addressing mode in DFSMShsm

We would like to request the implementation of 64-bit addressing mode for DFSMShsm to avoid GETMAIN errors during Space Management.

 Even though existing APAR (e.g. OA32502) describe it as a works-as-designed effect, the limitation is drawing Storage environments into a direction 180° against IBM’s propagated way towards larger volumes in SMS Storage Groups. Temporary fixes suggested by IBM (using Mod.9) do not reflect contemporary strategies towards larger volumes (EAV).

 If today’s theoretical maximum of numbers of data set is around 1 mill. per volume* (all track managed area with 1 track data sets plus all cylinder managed area with 21 cylinders data sets), then all subsystems running against such volumes should be able to handle the amount of entries, and not stop working at a fraction of this number.

Idea priority Urgent
  • Guest
    Reply
    |     Jan 19, 2024

    Hi team, positive feedback from client:

    "seems to work much better now with large amounts of data". Not any abnormal behaviour seen this year. Apart from the fix, the client also has a much more cleaner system now (lower disk fragmentation, consolidated segments), which likely also contributed to much smoother processing. With 3 times more output data this year compared to last year, runtime even decreased.

  • Guest
    Reply
    |     Mar 13, 2023
    Correction: Available in OA64308.

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