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Status Not under consideration
Workspace z/OS
Categories DFSMS HSM
Created by Guest
Created on Oct 17, 2022

RELATED IDEAS

Assign WLM Service Classes to DFHSM Sub-tasks

We would like a way to assign different WLM service classes to DFHSM subtasks. Specifically we'd like to assign RECALLs to a high importance/velocity service class and MIGRATEs to a lower importance/velocity service class. Can this be done while there is only a single DFHSM started task, or are multiple DFHSM STC's required to do this? The reasoning for this request is that we would like more migration subtasks at a time without impacting our batch SLA's. DFHSM RECALL subtasks take up very little CPU, but is very important to get done in short order. DFHSM MIGRATE tasks take up an exorbitant amount of CPU, can impact other application functions if run at a high WLM service class, but is acceptable to be limited to the point of taking an extended amount of time to complete. Changing the DFHSM MIGRATE tasks to run wide, but with a lower service class SHOULD give us this balance.

Idea priority Medium
  • Guest
    Reply
    |     Feb 3, 2023

    Use parm DSSXMMODE(Y), afterwards you get subtasks called

    ARCxDUMP

    ARCxBKUP

    ARCxRCVR

    ARCxMIGR

    Afterwards you are able to qualify this tasks in WLM.

  • Guest
    Reply
    |     Jan 30, 2023
    Enabling WLM Service Classes for individual DFSMShsm functions requires those functions to run in SRB mode as opposed to TCB mode, which is technically not feasible. As such, DFSMShsm is not able to address this request via a single HSM address space. This is the reason why DFSMShsm supports running multiple HSM address spaces within a single LPAR with Auxiliary HSMs. This enables the primary HSM address space to run in a high service class for Recalls and an aulixary HSM running in a different address space assigned a lower service class. If you would like more information on setting up Auxiliary HSMs, then please reach out to me at wilcock@us.ibm.com.

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