1. Applications Upgrade Guide for IBM i with DB2 for IBM i
  2. Optimizing Machine Resources

Optimizing Machine Resources

Ideally you should run the Platform Pack Installer when the machine is not busy. However, if there are other processes running on the same IBM i as the Installer, their performance will be impacted by the Platform Pack installation.

The Platform pack install uses a prestart job in the QUSRWRK subsystem (program QZRCSRVS) which does Restores. This job runs at priority 20. In order to reduce the performance impact of this job, you can change its run priority during the install.

To change the run priority of the install job running in the QUSRWRK subsystem and optimize machine resources:

  1. Enter this command:

    WRKACTJOB SBS(QUSRWRK)

  2. Look for the job running program QZRCSRVS, type option 5 next to it, and press Enter.

    If there is more than one job running QZRCSRVS, the one using the most machine resources is most likely the one running the Platform Pack Installer. You can also check the job logs to find jobs unique to the Platform Pack Installer. Examples of such jobs are restores and CHGOBJOWN.

  3. For the job you selected in the previous step, enter option 40 (change job) press Enter.

  4. Enter 51 as the Run Priority and press Enter.