Figure: A VCS two-tiered globally clustered application and database represents a two-site, two-tier environment. The application cluster, which is globally clustered between L.A. and Denver, has cluster dependencies up and down the tiers. Cluster 1 (C1), depends on the remote service group for cluster 3 (C3). At the same time, cluster 2 (C2) also depends on the remote service group for cluster 4 (C4).

Just as a two-tier, two-site environment is possible, you can also tie a three-tier environment together.

Figure: A three-tiered globally clustered application, database, and storage represents a two-site, three-tier environment. The application cluster, which is globally clustered between L.A. and Denver, has cluster dependencies up and down the tiers. Cluster 1 (C1), depends on the RemoteGroup resource on the DB tier for cluster 3 (C3), and then on the remote service group for cluster 5 (C5). The stack for C2, C4, and C6 functions the same.