WebSphere brand IBM WebSphere Presence Server, Version 7.0

Evaluating your hardware environment

Presence Server installs and runs as an application on WebSphere® Application Server. It can be deployed on various hardware configurations.

You can designate a separate resource list server (RLS) component to handle all subscriptions on Presence lists requests, and you can set up a routing scheme in which different Presence Server clusters handle requests from different sets of users.

WebSphere Application Server supports numerous deployment topologies. It is beyond the scope of this documentation to provide detailed steps for each topology. Therefore deployment information has been grouped into a number of broad categories. Throughout the documentation the categories are used to provide a reference point. Each component has a unique deployment strategy. Prior to deployment, review all of the planning and installation information.

Here is a list of the most commonly used topologies in a WebSphere Application Server environment:
Note: The single server topology can be used for development or the proof of concept.
Note: For Presence Server, only clustered environments are supported. However, you can create a cluster with only one member.
Vertical scaling topology
Members of a cluster exist on the same physical machine. Some services perform better with a small or moderate size Java heap. This may not utilize all of the resources of a powerful machine, so a vertically scaled deployment allows the processor and memory to be more fully utilized, while each instance can run more efficiently in a smaller JVM heap.

Frequently, vertical scaling is combined with horizontal scaling to allow both the efficient use of resources and the benefits of physical redundancy.

Horizontal scaling topology
Members of a cluster exist on multiple physical machines, effectively and efficiently distributing the workload of a single instance. Clustering is most effective in environments that use horizontal scaling because of the ability to build in redundancy and failover, to easily add new horizontal cluster members to increase capacity, and to improve scalability by adding heterogeneous systems into the cluster.

You can combine vertical and horizontal scaling techniques to increase efficiency in the environment.

The database is shared and clustered.

Development topology
An IBM® WebSphere Telecom Toolkit development environment can help you rapidly develop and deploy applications. This toolkit is available as a free download. It is designed to reduce the time to develop applications that use the Presence Server and other IBM WebSphere software for Telecom program products. The toolkit includes:
  • The Presence Server API JAR file
  • A REST client sample application that demonstrates the Presence Server REST APIs
  • A SIP external source sample application (SIPp script) that simulates a SIP external source server
  • A set of code snippets for you to use in developing your applications.



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