For high availability–including scalability, load balancing, and
failover–you can configure WebSphere® Application Server so
that Presence Server runs
in vertical and horizontal clusters.
A cluster is a group of servers that are managed together and participate
in workload management. SIP and HTTP (for REST) proxy servers are used to
route requests among the servers in the cluster.
Because
Presence Server is
deployed in a clustered configuration, it offers the following potential benefits:
- Scalability: Use vertical clustering to take full advantage of the resources
of a multiprocessor system. Use horizontal cloning to allow for future growth.
- Load balancing: Reduce bottlenecks and other performance issues by distributing
and balancing the workload of a single server across multiple servers.
- Failover: When one server fails, you can activate the sessions from the
failed server on another server in the cluster so that normal operations proceed
without interruption.