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Status Delivered
Workspace IBM Z and LinuxONE Systems Hardware
Categories General/Miscellaneous
Created by Guest
Created on Dec 10, 2018

RELATED IDEAS

Reduce CPU overhead of SET RDEV command when z/VM Dynamic I/O Reconfig on LinuxONE

zLinux on z / VM is running integrated DB server with 24 x 365. When adding DASD etc., I use dynamic I / O Reconfig function.
In order to connect the new DASD to the z / VM system running at 24 x 365 and recognize it, the SET RDEV command is executed with the range specification. When the range width is large, the CPU overhead(LPAR ovrhd) increases extremely. Increasing the load of the SET RDEV command becomes a problem when this SET RDEV command is executed with high CPU load(LPAR ovrhd).
In order to reduce the CPU overhead(LPAR ovrhd), control such as serializing processing or designating priority of processing can be performed.

Idea priority Medium
  • Guest
    Reply
    |     Aug 27, 2020

    .Thank you for your feedback. This fix has now been delivered :
    APAR closed 2019 and hit V63, 64, & 71. It is in the base code of 72
    APAR= VM65730 SER= PR PERFM
    SET RDEV CAUSES OVERHEAD/SUSPEND TIME ON PROCESSOR
    STAT= CLOSED PER FESN0460647- CTID= PM0611 ISEV= 3

  • Guest
    Reply
    |     Aug 26, 2020

    Thanks for your input, the team is evaluating.

  • Guest
    Reply
    |     Aug 20, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Hardware
    Product - z Systems Hardware
    Component - General/Miscellaneous

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - LinuxONE
    Product - IBM LinuxONE
    Component - LPAR

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