5.3 Configuration
From SambaWiki
5.3: Configuration
Heartbeat running as version 1.2.3 is very easy to configure and manage. The never version 2 is able to support multiple nodes and uses xml type configuration files. If you are using version 2 I recommend running using crm = no option which provides 1.2.3 backwards compatability.
Just remember to always run the same version of heartbeat on both nodes.