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The Policy Server can spread LDAP queries over multiple LDAP servers to enable failover and load balancing. If configured for failover, the Policy Server uses one LDAP server to fulfill requests until that server fails to respond. When the default server does not respond, the Policy Server routes the request to the next server specified for failover. This process can be repeated over multiple servers. Once the default server is able to fulfill requests again, the Policy Server routes requests to the original server.
If configured for load balancing, the Policy Server spreads requests over the specified LDAP servers. This distributes requests evenly across LDAP servers. Coupled with failover, load balancing provides faster, more efficient access to LDAP user directory information, with the added benefit of redundancy in the event of a server failure.
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