Programming Guides › Programming Guide for Java › Agent API › Server Clusters › Clustered and Non-Clustered Servers

Clustered and Non-Clustered Servers

An agent running against Agent API v6.x can be associated with one or more Policy Servers, or with one or more clusters of Policy Servers, as follows:

• Clustered servers

  In the ServerDef object for each clustered server, set clusterSeq() to the sequence number for the cluster. All servers in a cluster have the same cluster sequence number.

  Behavior: Failover occurs between clusters of servers if multiple clusters are defined. Also, requests to servers within a cluster are sent according to the improved performance-based load-balancing techniques introduced with Agent API v6.0.

• Non-clustered servers

  In the ServerDef object for each non-clustered server, set the method clusterSeq() to 0.

  Behavior: Behavior is the same as in v5.x installations—that is, you can enable failover among the servers associated with the agent, or you can enable round-robin behavior among the servers.

  When round-robin behavior is enabled, the improved performance-based load-balancing techniques introduced with Agent API v6.0 are used.

Note: The same agent cannot be associated with both clustered and non-clustered servers.