In a multiple-site configuration, two or more OpenSSO Enterprise servers are configured in each site. A multiple-site configuration is useful when you need to centrally manage OpenSSO Enterprise servers located in distant geographical locations. Multiple-site configuration is usually used in WAN environments, or where sites are managed as separate operational units within a LAN environment. Each site can have one or more load balancers.
While system failover can be configured among all sites in the deployment, session failover is possible only within each site. WAN environments are subject to speed, network latency, firewall, and bandwidth issues. For these reasons, OpenSSO Enterprise session failover is not supported across multiple sites within a LAN or WAN environment.
The following are typical reasons to use a multiple-site configuration:
Close proximity of OpenSSO Enterprise servers in a LAN environment
Underlying network infrastructure limitations exist.
Operational domains are managed as independent units.
OpenSSO Enterprise servers span across network boundaries as in the case of a WAN environment.