This section helps you to plan your hardware for the primary cluster, the secondary cluster, and the inter-cluster communication.
The Sun Cluster Geographic Edition hardware configuration consists of the following elements:
At least two separate clusters that are running Sun Cluster software with attached data storage. One of these clusters must be designated the primary cluster.
While you can use a single-node cluster at both the primary and backup sites, a single-node cluster offers no internal redundancy. To ensure no single point of failure, you must have a minimum of two nodes in a cluster at the primary site. You can use a single-node cluster at the secondary site as a cost-effective backup solution, if the secondary site is used only for backup purposes and is not for running mission-critical applications.
Internet connections for inter-cluster management communication between the clusters and for default inter-cluster heartbeats.
Connections for either host-based or storage-based data replication.
Connections for custom heartbeats, if any.
The hardware configurations that Sun Cluster Geographic Edition software supports are identical to the hardware configurations that the Sun Cluster product supports. For use of Sun Cluster Geographic Edition software with storage-based data replication mechanisms, the cluster hardware configurations are those configurations that support the related storage hardware. Partner clusters must be compatibly configured to support data replication between the clusters.
Use of the Sun Cluster Geographic Edition product with Hitachi TrueCopy data replication requires Sun Cluster configurations with Sun StorEdgeTM 9970/9980 Array or Hitachi Lightning 9900 Series storage that supports the Hitachi TrueCopy command interfaces.
Internet access is required between partner clusters. The communication between partner clusters for inter-cluster management operations is through a logical-hostname IP address. The default inter-cluster heartbeat module also communicates through a logical-hostname IP address.
A cluster in a Sun Cluster Geographic Edition partnership conforms to the standard configuration rules of a cluster that is running Sun Cluster software.