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If your site uses clusters, you typically will have a primary cluster and one or more backup clusters.
The primary cluster is the cluster to which SiteMinder sends requests as long as the number of available servers in the cluster does not fall below the failover threshold. If there are not enough available servers in the primary cluster, failover to the next cluster in the cluster sequence occurs. If that cluster also fails, failover to the third cluster occurs, and so on.
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