Sun Cluster Concepts Guide for Solaris OS

Cluster Interconnect

The cluster interconnect is the physical configuration of devices that is used to transfer cluster-private communications and data service communications between Solaris hosts in the cluster. Because the interconnect is used extensively for cluster-private communications, it can limit performance.

Only hosts in the cluster can be connected to the cluster interconnect. The Sun Cluster security model assumes that only cluster hosts have physical access to the cluster interconnect.

You can set up from one to six cluster interconnects in a cluster. While a single cluster interconnect reduces the number of adapter ports that are used for the private interconnect, it provides no redundancy and less availability. If a single interconnect fails, moreover, the cluster is at a higher risk of having to perform automatic recovery. Whenever possible, install two or more cluster interconnects to provide redundancy and scalability, and therefore higher availability, by avoiding a single point of failure.

The cluster interconnect consists of three hardware components: adapters, junctions, and cables. The following list describes each of these hardware components.

See Chapter 4, Frequently Asked Questions for questions and answers about the cluster interconnect.