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Status Future consideration
Workspace z/OS
Categories BCP_Consoles
Created by Guest
Created on May 11, 2016

RELATED IDEAS

MVS "VARY OFFLINE" for an offline device should not request SYSIEFSD Q4 ENQ for 5 seconds

The current implementation for processing a VARY-OFFLINE-command is to request the "SYSIEFSD Q4" enqueue exclusively and cancel this request after 5 seconds if it could not be obtained.
If due to some error or during allocation recovery some shared holder of this enqueue got stuck, each and every allocation has to wait for 5 seconds behind this exclusive request.
While this is a valid design when setting a device offline which is currently online (with "alerting" messages after 5 seconds!) this design can severely impact performance without any alert if the command was issued for an offline devices because the command is then processed after 5 seconds.This performance impact is especially severe if hundreds of such commands had been issued.

Suggested improvement:
A design with much less impact would be to check the device status first and if it is already offline, you can do your "blocking of other requestors" by requesting Q4 exclusively while checking the device status with a very short timer. If you find the device is online, then you could go ahead as currently implemented. This would eliminate the extreme delays we had been suffering from.

Idea priority High
  • Guest
    Reply
    |     Jul 13, 2016

    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 - BCP_Consoles
    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 - BCP_General
    Operating system - IBM z/OS
    Source - None

  • Guest
    Reply
    |     May 12, 2016

    Creating a new RFE based on Community RFE #88184 in product z/OS.

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