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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Apr 18, 2018

Allow DB2 system agents be offloaded to zIIP regardless of iiphonorpriority settings

In DB2 11, if the subsystem come up and detects that IIPHONORPRIORITY=NO, then the system agents will no longer be dispatched to zIIP.

We would like that system agents will be offloaded to zIIP regardless of iiphonorpriority settings.
  • Admin
    Janet Figone
    Reply
    |
    Dec 17, 2020

    Thank you for your suggestion. While current system agent’s behavior based on the IIPHONORPRIORITY is not perfect solution, it is done to protect Db2 subsystem. The delay from system agents such as a log write engine could cause the significant impact to Db2 subsystem. We have considered and experimented the alternate solutions such as dynamically switching the behavior based on zIIP usage, it is concluded very difficult to achieve seamless switch without impacting performance and product stability. If the concern is to have non-Db2 zIIP eligible workloads, such as java or spark based applications to consume GP due to zIIP-help function, you may want to consider to use service class level of HONOR priority for these workloads.

    Sincerely,

    The Db2 for z/OS Development team