Sun Cluster 3.1 Data Services Developer's Guide

Resource Group Manager

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

The RGM supports the following functions:

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 invokes a resource-type specific callback method on that resource. Callback methods are described in Callback Methods.