You can enable the automatic distribution of resource group load across nodes by setting load limits. You assign load factors to resource groups, and the load factors correspond to the defined load limits of the nodes.
The default behavior is to distribute resource group load evenly across all the available nodes. Each resource group is started on a node from its node list. The Resource Group Manager (RGM) chooses a node that best satisfies the configured load distribution policy. As resource groups are assigned to nodes by the RGM, the resource groups' load factors on each node are summed up to provide a total load. The total load is then compared against that node's load limits.
You can configure load limits in a global cluster or a zone cluster.
The factors you set to control load distribution on each node include load limits, resource group priority, and preemption mode. In the global cluster, you can set the Concentrate_load property to choose the preferred load distribution policy: to concentrate resource group load onto as few nodes as possible without exceeding load limits or to spread the load out as evenly as possible across all available nodes. The default behavior is to spread out the resource group load. Each resource group is still limited to running only on nodes in its node list, regardless of load factor and load limit settings.
This section contains the following procedures: