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| Oracle Solaris Cluster Geographic Edition Overview Oracle Solaris Cluster 4.1

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## Three-Data-Center (3DC) Topologies

You can use a campus cluster for the primary cluster and a secondary cluster for disaster recovery, which creates a three-site or three–data–center (3DC) configuration of primary, backup, and disaster recovery sites.

There are two ways to perform 3DC replication:

- Use volume-manager mirroring within the campus cluster. Use Sun Availability Suite or application-based replication, such as Oracle Data Guard or MySQL software replication, to the disaster recovery site.

- Use storage-based replication within the campus cluster, such as EMC Symmetrix Remote Data Facility. Use application-based replication, such as Oracle Data Guard or MySQL software to replicate the application from the campus cluster to a disaster recovery site.

You cannot create a daisy chain of Geographic Edition pairs (for example, London-Paris-Rome) for the same managed application.

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