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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## Resource Group Manager

The Resource Group Manager (RGM) is implemented as a daemon, `rgmd`, that runs on each global-cluster node. All of the `rgmd` processes communicate with each other and act as a single cluster-wide facility.

The RGM supports the following functions:

- Whenever a node fails, the RGM attempts to maintain the availability of all managed resource groups. The RGM does so by automatically bringing them online on correct masters.

- If a particular resource fails, its monitor program can request that the resource group be restarted on the same master or switched to a new master.

- The cluster administrator can issue an administrative command to request one of the following actions:

  - Change mastery of a resource group.

  - Enable or disable a particular resource within a resource group.

  - Create, delete, or modify a resource type, a resource, or a resource group.

Whenever the RGM activates configuration changes, it coordinates its actions across all member nodes of the cluster. This kind of activity is known as a reconfiguration. To effect a state change on an individual resource, the RGM runs a resource type-specific callback method on that resource.

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