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| Oracle Solaris Cluster Geographic Edition Overview Oracle Solaris Cluster 4.1

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## Heartbeat Monitoring

Geographic Edition software uses heartbeats to monitor the state between partner clusters. Heartbeats are sent over the public network to detect cluster failures at geographically separated sites. Heartbeat monitoring is part of a partnership configuration. For example, a cluster failure occurs when all nodes of a cluster shut down. Geographic Edition software uses the heartbeat status to notify administrators of failures or to trigger a failover to a secondary cluster at an alternate site. Heartbeats could also be lost when a cluster loses access to the public network and no communication occurs between the partner clusters.

### Heartbeat Plug-ins

The heartbeat monitor uses plug-in modules to query the heartbeat status of its partners. Geographic Edition software offers default plug-ins for monitoring through a TCP/UDP connection.

You can use customized plug-ins to provide a data path over alternate communication links, such as email, HTTP, satellite, and microwave towers.

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