How does SelfReliant provide application redundancy?
SelfReliant allows users to establish hardware or software resource redundancy through the use of service groups. A service group consists of a set of resources that provide the same service. Users add resources to a service group and select the availability policy for that group either programmatically or via the SelfReliant Console. • Once established, the service group policy notifies the applications of their role so they appropriately initiate the checkpointing of state information. For example, upon receiving notification of the active role, the application activates and begins to checkpoint state data to the standby; the standby receives its role and begins to receive and maintain state information from the active. Service group policy is responsible for activating the standby application upon failure of the active. • Service groups can span a single or multiple nodes and many service groups can exist per SelfReliant cluster.
