Configure and manage multi-cell performance in your environment to avoid overprovisioning resources, such as CPU and memory utilization. Adding or removing cells to a star topology is completely dynamic. However, the center cell has to be restarted after the CenterCell=true custom property is set.
When you configure multi-cell performance management, multiple cells are managed as a single unit, because the cells share common resources. From a functional perspective, performance management, such as dynamic clusters and overload protection, operates on multiple cells of the same hardware in the same way that performance management operates in a single cell. This feature applies directly to the application placement controller to allow management, through dynamic placement and elasticity, throughout the topology.
In a star topology a single cell is designated as the center cell, while the other cells are designated as the point cells. The center cell can perform work, such as contain ODRs and application servers, and only the center cell makes autonomic decisions to start or stop application servers.
The following procedure describes a sample scenario in which multi-cell performance management is configured in a star topology environment so that work requests can be routed from an ODR to dynamic cluster members across cells. The ODR is installed and running on CellA, which is the center cell. The two-point cells, CellB and CellC, contain the dynamic clusters and applications.