In this Oracle VM Server for SPARC software guest domain topology, a cluster and every node within that cluster are located on the same cluster host. Each guest domain acts the same as a node in a cluster. This configuration includes three nodes rather than only two.
In this topology, you do not need to connect each virtual switch (vsw) for the private network to a physical network because they need only communicate with each other. In this topology, cluster nodes can also share the same storage device, as all cluster nodes are located on the same host or box. To learn more about guidelines for using and installing guest domains or I/O domains in a cluster, see How to Install Oracle VM Server for SPARC Software and Create Domains in Oracle Solaris Cluster Software Installation Guide .
Caution - The common host/box in this topology represents a single point of failure.
All nodes in the cluster are located on the same host/box. Developers and administrators might find this topology useful for testing and other non-production tasks. This topology is also called a “cluster in a box”. Multiple clusters can share the same physical host/box.
The following figure illustrates a cluster in a box configuration.
Figure 2-9 SPARC: Cluster in a Box Topology