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A clustered environment is similar to the SiteMinder environment with a single policy store and multiple Web Agents and Policy Servers. However, in a cluster, the policy stores are copied, not replicated, the difference being that a copied store is a snapshot of the policy store at a specific point in time; it is not dynamically updated. A replicated store is updated automatically. Typically a change is made to a primary database and then the changes are propagated to secondary databases.
In addition, you can upgrade one cluster site independently from another and still maintain single sign-on between them.
The following figure illustrates the clustered environment on a smaller scale:
Use the procedures outlined in this guide to upgrade this environment.
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