Performance Index

Performance index is a calculation of how well work is meeting its defined goal. For work with response time goals, the performance index is the actual divided by goal. For work with velocity goals, the performance index is goal divided by actual.

A performance index of 1.0 indicates the service class period is exactly meeting its goal. A performance index greater than 1 indicates the service class period is missing its goal. A performance index less than 1.0 indicates the service class period is beating its goal. Work with a discretionary goal is defined to have a performance index of .81.

Each service class period has a sysplex and a local performance index. The sysplex performance index represents the performance of a service class period across all the systems in the sysplex. The local performance index represents only the performance on the local system.

Within resource groups and importances, receivers are selected in performance index order. Donors are selected in the reverse order of receivers. The sysplex performance index is the primary criteria used for selecting receivers and donors and assessing changes.