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Status Delivered
Workspace IBM DS8000
Created by Guest
Created on Jun 21, 2019

RELATED IDEAS

Erase on Scratch

We have been directed to implement the ERASE on Scratch (ALL) setting on our IBM Systems. Testing was done in our Development environment, but users notified us that the elapsed times of jobs that deleted large disk files were significantly longer with EOS enabled versus EOS disabled. A decision was made to turn off Erase on Scratch.

Idea priority Low
  • Guest
    Reply
    |     Oct 3, 2023
    Although DADSM UNMAP was delivered in 3.1 timeframe, users still need DADSM UNMAP support on volumes in copy services relationships. This requires DS8K Hardware support. I am changing the status back to Uncommitted in order to keep the IDEA open.
  • Guest
    Reply
    |     Oct 3, 2023

    A correction to the last comment. DADSM UNMAP was delivered in the z/os 3.1 timeframe, but DADSM UNMAP does not support datasets on volumes in copy services relationships. So, this idea's status needs to be changed back to uncommitted.

  • Guest
    Reply
    |     Oct 3, 2023
    This idea has been delivered in z/OS 3.1, which was made generally available 9/29/2023.
  • Guest
    Reply
    |     Sep 8, 2022

    DADSM UNMAP function was delivered in April of this year (2022). This support, today, is only for volumes that have the correct microcode level, are not in a copy services relationship and have the correct racf facility profile set. With this support, there is no elapsed time penalty to erase tracks from extents that are scratched or partially released. APAR numbers are OA61492, OA61494 and OA61495. Support for datasets on volumes in copy services relationships is pending hardware support.

  • Guest
    Reply
    |     Mar 18, 2022

    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 Disk Storage SW Support
    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

  • Guest
    Reply
    |     Jan 20, 2022

    This support is planned for continuous delivery (releases 240 and 250) support in 1Q22

  • Guest
    Reply
    |     Jul 28, 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 CVAF/DADSM
    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 Disk Storage SW Support
    Operating system - IBM z/OS
    Source - None

  • Guest
    Reply
    |     Sep 10, 2019

    zVM development released a 'Fast Minidisk Erase' facility where they are using Locate Record Erase to 'erase' up to 255 tracks at one time.
    EOS support on zOS has varied from using WCKD commands against every track (with chained WCKD commands) to write record 0 and clear the track.
    If they now utilize Locate Record Erase as is being done by zVM, it will reduce the IO count as well as the time required for the erase.

  • Guest
    Reply
    |     Jun 24, 2019

    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 Disk Storage SW Support
    Operating system - IBM z/OS
    Source - None

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

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