Changing the Defined Capacity

The Defined Capacity can be changed for individual LPARs only.

When Cost Management evaluates the operations on the model based on the changes made in a plan, the plan steps do not execute in the order in which you defined them, but according to the priority of the operation. Changing the Defined Capacity is the highest priority operation that can be performed on the LPAR level. When you change the Defined Capacity, the workload might change; Defined Capacity changes must be completed before any workload changes take effect.

To change the Defined Capacity

1. In the Defined Capacity adjustment control, enter the Defined Capacity MSU value you want to set or use  to set the MSUs value.
2. After setting the value, click Apply.
   The MLC Planning tool applies changes to the model and performs an evaluation.

3. When prompted to view the evaluation results, click Yes to view them, or No to continue working.If you continue working, a straight black line in the viewer's charting area indicates the new Defined Capacity.

   When you change the Defined Capacity, any activity in a workload that operates above the new limit shifts to the next interval. If the next interval is still above the limit, this process continues until the total LPAR R4 drops sufficiently below the Defined Capacity to absorb all activity that could not be executed in previous intervals because of the new limit.

   Cost Management modifies not only the total LPAR, but also the workload values. The modification shifts the least important work to the next interval. If the shift is not enough to bring LPAR usage below the new Defined Capacity, the process repeats for the next-least-important workload. This procedure models the actions of WLM corresponding to decreasing the Defined Capacity or introducing a Defined Capacity to a system that previously did not have it.