Description of a Resource Group

Each resource must be configured in a resource group. The RGM brings all resources in a group online and offline together on the same node or in the same zone. When the RGM brings a resource group online or offline, it runs callback methods on the individual resources in the group.

The nodes or zones where a resource group is currently online are called its primaries or primary nodes or primary zones. A resource group is mastered by each of its primaries. Each resource group has an associated Nodelist property that identifies all potential primaries or masters of the resource group. The cluster administrator sets the Nodelist property.

A resource group also has a set of properties. These properties include configuration properties that can be set by the cluster administrator and dynamic properties, set by the RGM, that reflect the active state of the resource group.

The RGM defines two types of resource groups: failover and scalable. A failover resource group can be online on only one node or zone at any time. A scalable resource group can be online on multiple nodes or zones simultaneously. The RGM provides a set of properties to support the creation of each type of resource group. See Transferring a Data Service to a Cluster and Implementing Callback Methods for details about these properties.

Resource Group Properties contains a list of resource group properties.