In a campus environment, you use VCS and Veritas Volume Manager to create a cluster that spans multiple datacenters or buildings. Instead of a single storage array, data is mirrored between arrays by using Veritas Volume Manager. This configuration provides synchronized copies of data at both sites. This procedure is identical to mirroring between two arrays in a datacenter; only now it is spread over a distance.

Figure: Campus shared storage cluster shows a campus shared storage cluster.

A campus cluster requires two independent network links for heartbeat, two storage arrays each providing highly available disks, and public network connectivity between buildings on same IP subnet. If the campus cluster setup resides on different subnets with one for each site, then use the VCS DNS agent to handle the network changes or issue the DNS changes manually.