Understanding and Designing Serviceguard Disaster Recovery Architectures

Metrocluster product is suggested) . There can be up to 16 nodes in this cluster and the maximum
distance supported is 100 kilometers.
You can use SONET instead of WDM in this configuration. With SONET, you could use a point
to point topology, as shown in this example, or you can use a dual SONET ring topology which
passes through the two Primary data centers, where the working ring and the protection ring are
alternately routed.
Additional information on Extended Distance Clusters is available at http://www.hp.com/go/
hpux-serviceguard-docs -> HP Extended Distance Cluster.
Extended Distance Cluster configurations with Two Data Centers and a Third Location 69