After creating a high-availability cluster on a primary site, you can configure a secondary site cluster for disaster recovery.
This disaster recovery solution requires Volume Replicator (Volume Replicator).
In a typical clustered Volume Replicator configuration the primary site consists of two nodes, SYSTEM1 and SYSTEM2. Similarly the secondary setup consists of two nodes, SYSTEM3 and SYSTEM4. Each site has a clustered setup with the nodes set up appropriately for failover within the site. At least two disk groups are necessary - one for the application and one for the quorum resource volume. The quorum volume is not replicated from the primary site to the secondary site. Each site has its own quorum volume.
The following figure illustrates the cluster configuration on the primary site.
The following figure shows the primary and secondary site configuration.
The quorum disk group is created separately on each site; it does not get replicated because each cluster has its own quorum.
More information is available on disk group and volume configuration.
The following figure shows details on the configuration of the Volume Replicator Replicated Volume Group. The Microsoft SQL Server application data is stored on the volumes that are under the control of the RVG.