Specifying the capacity as a number of CPs — Example 2

For resource group type 3, the capacity is defined as a number of general purpose processors (CPs). The following example illustrates how the capping works for a resource group type 3 and how to calculate this. This means, finding out to how many service units per second (SU/s) the defined capacity corresponds.

The CEC is a zSeries 990, Model 316. The WLM service definition specifies a resource group RGT3 (= type 3) with a maximum/minimum value of 250. For resource group type 3 a number of 100 represents the capacity of 1 CP. The LPAR has 6 processors assigned on the hardware console and none of them have been varied offline from the MVS™ console. To calculate the capping value, do the following:

1. For the correct SU/s value for the resource group, refer to CPU capacity table. In the table for z990s, find the row that represents the model with the number of online processors that your LPAR has. In the current example, this is Model 306, because your LPAR has 6 online processors.
   Note: The higher number in this row compared to the value for Model 316 accounts for the lower MP factor that your LPAR has because it has only 6 processors.
2. So, the value you pick is 18 626.3.
3. Multiply 18 626.3 by 250/100.
4. The result is: on that system, the maximum capacity for RGT3 is 46 565 SU/s.

The calculation is done individually for each LPAR. If the LPARs in the sysplex have a different number of processors assigned to them - one can still calculate the correct capping value. This means, the same resource group may represent different SU/s on different LPARs.

An advantage of using resource group type 3 is that it dynamically adjusts to the processor capacity when the work is run on another hardware.