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.
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.
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.
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.
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.
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.
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
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.
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.
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.