Overview of MSU limit, CPCMSU limit, and cost limit
Terminology | Definition |
|---|---|
MSU limit | The maximum number of allowable MSUs that can be consumed by all LPARs, capacity groups, and subpolicies that a policy manages You must specify an MSU limit when creating a policy or subpolicy. If iCap is executing a dynamic MSU limit, you can set a range of MSU limit values. For more information, see Overview-of-dynamic-MSU-limit. |
CPC MSU limit | The maximum number of allowable MSUs that can be consumed by the managed LPARs and capacity groups that are running on a CPC When adding a CPC to a policy, you can allow iCap to use all available MSUs on the CPC (the default option), or you can specify a CPCMSU limit. |
Cost limit | The maximum number of allowable cost units that can be consumed collectively by all LPARs and capacity groups that a policy manages You can manage the cost of a policy or subpolicy by imposing a cost limit. |
iCap uses these limits as follows:
- When setting entitlements, iCap considers the MSU limit and the CPCMSU limit, ensuring that the sum of DCs and GCLs does not exceed these values.
At least one LPAR or group is subject to capping if either of the following conditions exists:- The combined 4HRA (or (BMC.AMIOPS.SPE2210)current MSU usage) of all managed LPARs and capacity groups exceeds the MSU limit.
- The combined 4HRA (or (BMC.AMIOPS.SPE2210)current MSU usage) of the LPARs and groups on a CPC exceeds the CPCMSU limit.
- If a policy contains subpolicies, the subpolicy MSU limits are subtracted from the policy's MSU limit. For example, a policy has an MSU limit of 1000, and contains one subpolicy with an MSU limit of 200. Consequently, the LPARs and capacity groups in the policy are limited to 800 MSUs.
If a cost limit is imposed, iCap considers the relative cost of an LPAR or group when distributing MSUs. That is, iCap evaluates the cost of one LPAR or group against another LPAR or group.
The relative cost is calculated in cost units, and the cost limit is the sum of cost units for all LPARs and groups that a policy or subpolicy manages. iCap then distributes MSUs according to the cost limit and the MSU limit, and ensures that neither of these values is exceeded.