Manage Capacity on Demand for a cluster

Use this task to add the Capacity on Demand (CoD) for one or more application controllers in the cluster, view and edit the CoD properties.

Fields

Using CoD resources might result in extra costs
Acknowledge that you understand that there might be extra costs involved by using CoD, and you agree to all the additional costs that are incurred.
I agree
Select this option if you agree to the extra cost of using CoD.
I do not agree
Select this option if you disagree to the extra cost of using CoD.
Note: By default, the option I do not agree is selected. By selecting the I agree option, the rest of the fields in this window are enabled.
Use CoD if resources are insufficient
Specifies whether the PowerHA® SystemMirror must use CoD to obtain enough resources to fulfill the minimum amount requested by the application. Using CoD requires a license key (activation code) to enter on the Hardware Management Console (HMC) and the usage of CoD license might result in extra cost.

PowerHA SystemMirror requests the additional resources through CoD, if the amount of available resources on the Dynamic Logical Partition (DLPAR) plus the amount that can be allocated from the free pool does not meet the minimum amount requested for the application controller.

Yes
Select this option if you want PowerHA SystemMirror to use CoD to obtain enough resources to fulfill the minimum amount requested.
No
Select this option if you do not want PowerHA SystemMirror to use CoD to obtain enough resources to fulfill the minimum amount requested.
Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Minimum virtual/real CPUs
Specifies the minimum number of Central Processing Unit (CPUs) to acquire for the Logical Partition (LPAR) during the start of the application controller.

To provision the application controller, the PowerHA SystemMirror checks the number of CPUs that the LPAR node currently has above its minimum level and compares this number with the minimum value requested in this field and based on this, requests more CPUs, if needed.

Note: The minimum value of the LPAR is a starting point of calculation for the PowerHA SystemMirror. For example, if the LPAR minimum value is 2 and if the LPAR currently owns only two CPUs, and the application controller requests three, this means that the PowerHA SystemMirror will request for three more CPUs.

The PowerHA SystemMirror attempts to allocate three CPUs from the free pool on the frame, or through the CoD function.

If PowerHA SystemMirror cannot satisfy the number of CPUs specified in this field for the application controller, the PowerHA SystemMirror performs the resource group recovery actions to move the resource group with its application to another node.

For the LPAR running in the shared mode, this field represents the desired virtual processors. Virtual processors are the maximum numbers of CPUs that the LPAR is allowed to use.

If the number of virtual processors for the LPAR is set to five, the LPAR can use a maximum of five CPUs. The LPAR is allowed to dynamically increase the processing units to 5.0 even if the maximum processing unit of the LPAR is 1.0.

If the minimum processing units of the application is set to 1.1, the virtual processors can be set to the minimum value of 2. The number of processors entered plus the virtual processors for the LPAR must not be larger than the maximum number of virtual processors for that LPAR.

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Desired virtual/real CPUs
Specifies the maximum number of CPUs that the PowerHA SystemMirror attempts to allocate to the node before starting this application on an LPAR with the dedicated mode.

During the configuration, PowerHA SystemMirror verifies whether the field value is greater than or equal to the minimum number of CPUs specified in the Minimum CPUs field. PowerHA SystemMirror allocates CPUs if there are not enough CPUs available in the free pool.

For the LPAR running in the shared mode, this field represents the desired virtual processors. Virtual processors are the maximum numbers of CPUs that the LPAR is allowed to use.

For example, if the desired processing units is 3.1, the recommended number of virtual processors is four. During allocation, the maximum number of LPARs for the virtual processors is used if the total virtual processors of applications is larger than the maximum numbers of virtual processors of LPARs.

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Minimum processor units (applies only to shared CPU environment)
For the LPAR running in the dedicated mode, enter the default value of 0.0.

For the LPAR running in the shared mode, enter the minimum amount of processing units to acquire when the application starts. You can enter whole numbers or decimal numbers in this field.

To perform the application provisioning, PowerHA SystemMirror checks the number of processing units that the LPAR node currently has above its minimum level and compares this number with the minimum requested in this field and based on this, requests more processing units, if needed.

To use processing units efficiently enter the whole numbers. For example, if you enter a value of 3.1 processing units and if the free pool has no processing units available, PowerHA SystemMirror will activate four CPUs from the CoD pool.

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Desired processor units (applies only to shared CPU environment)
For the LPAR running in the dedicated mode, enter the default value of 0.0.

For the LPAR running in the shared mode, enter the desired number of processing units.

PowerHA SystemMirror attempts to allocate the node to the LPAR before starting the application on this node. You can enter whole numbers or decimal numbers in this field.

During the configuration, the PowerHA SystemMirror verifies whether the field value is greater than or equal to the minimum number of processing units specified in the Minimum processor units field. If there are not enough CPUs available in the free pool, the PowerHA SystemMirror allocates CPUs by rounding up the processing units to the nearest whole number of CPUs

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Minimum memory (megabytes)
Specifies the amount of memory that is required to acquire by the application when the application controller starts.

To perform the application provisioning, PowerHA SystemMirror checks the amount of memory that the LPAR node currently has above its minimum level and compares this amount with the minimum requested in this field and based on this, requests more memory, if needed.

Note: The minimum memory value of the LPAR is a starting point of the calculation for the PowerHA SystemMirror. For example, if the LPARs minimum memory value is 256 MB and if the LPAR currently owns only 256 MB, and the application controller requests 512 MB, this means that the PowerHA SystemMirror will request 512 MB more memory.

PowerHA SystemMirror attempts to allocate the additional memory from the free pool on the frame, or attempts through the CoD function, if you prefer to use CoD.

If this amount of memory is not sufficient, PowerHA SystemMirror takes the resource group recovery actions to move the resource group with its application to another node.

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Desired memory (megabytes)
Specifies the maximum amount of memory that the PowerHA SystemMirror attempts to allocate to the node before starting this application.

During the configuration, PowerHA SystemMirror checks that this value is greater than or equal to the minimum amount of memory specified in the Minimum memory field.

PowerHA SystemMirror allocates less memory if there is not enough memory available.

Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.
Application controllers
Specifies the application controller for which you need to configure DLPAR and CoD resource provisioning.
Note: This option is disabled by default, and is only enabled when the Using CoD resources might result in extra costs field is set to I agree.