Use the multi-site configuration to scale horizontally between
disparate, loosely-coupled distributed systems. A wide-area network (WAN) is
the main use case for the multi-site topology.
How Multi-site (WAN) Systems Work
The vFabric GemFire multi-site implementation connects disparate distributed systems. The systems to act as one when they are coupled and they act as independent systems when communication between sites fails. The coupling is tolerant of weak or slow links between distributed system sites.
Multi-site (WAN) Topologies
To configure your multi-site topology, you should understand the recommended topologies and the topologies to avoid.