Resource Group Manager (RGM)

Sun Cluster provides an environment for making applications highly available or scalable. The RGM acts on resources, which are logical components that can be:

• Brought online and taken offline (switched)

• Managed by the RGM framework

• Hosted on a single node (failover mode) or multiple nodes (scalable mode)

The RGM controls data services (applications) as resources, which are managed by resource type implementations. These implementations are either supplied by Sun or created by a developer with a generic data service template, the Data Service Development Library API (DSDL API), or the Sun Cluster Resource Management API (RMAPI). The cluster administrator creates and manages resources in containers called resource groups, which form the basic unit of failover and switchover. The RGM stops and starts resource groups on selected nodes in response to cluster membership changes.