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In any clustered SiteMinder environment, you must configure a failover threshold. When the number of available Policy Servers falls below the specified threshold, all requests that would otherwise be serviced by the failed Policy Server cluster are forwarded to another cluster.
The failover threshold is represented by a percentage of the Policy Servers in a cluster. For example, if a cluster consists of four Policy Servers, and the failover threshold for the cluster is set at 50%, when three of the four Policy Servers in the cluster fail, the cluster fails, and all requests fail-over to the next cluster.
The default failover threshold is zero, which means that all servers in a cluster must fail before failover occurs.
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