Configuring dynamic application placement

Dynamic application placement is the process by which the features of the Intelligent Management dynamic operations work together to start and stop application instances to meet the fluctuating demand of work requests of varying service policy definitions. This set of actions is controlled by the application placement controller.

Before you begin

• Before configuring application placement, create an on demand router (ODR) and configure the autonomic request flow manager. For more information about configuration, read about configuring the autonomic request flow manager.
• Create a service policy. For more information, read about defining a service policy.
• Verify that you have the correct administrative role. If you want to change the configuration of the application placement controller, you must have a Configurator or Administrator administrative role. If you want to change runtime settings, you must have an Operator or Administrator administrative role.

About this task

Dynamic clusters are the deployment target for your applications. When you create a dynamic cluster, you define a minimum and maximum number of application instances, or cluster members. The application placement controller works to keep these numbers of instances available along with working to meet the demand of your defined service policies. For more information about dynamic clusters, read about creating dynamic clusters.

1. Enable or disable the application placement controller and adjust other settings such as the minimum amount of time between placement changes, the server operation timeout, and so on. For more information about enabling, disabling and adjusting settings, read about monitoring and tuning the application placement controller.
2. Configure and manage multi-cell performance in your environment to avoid overprovisioning resources, such as CPU and memory utilization. For more information, read about configuring multi-cell performance management.
3. enable the elasticity mode to add logic that causes the application placement controller to minimize the number of nodes that are used, as well as remove nodes that are not needed, while still meeting service policy goals. For more information about the elasticity mode, read about configuring elasticity mode.