You have configured VCS service groups for the database on each cluster. Each cluster requires an additional virtual IP address associated with the cluster for cross-cluster communication. The VCS installation and creation of the ClusterService group typically involves defining this IP address.
Configure a global cluster by setting:
Heartbeat
Wide area cluster (wac)
GCO IP (gcoip)
remote cluster resources
See the Veritas Cluster Server Administrator's Guide for complete details on global clustering.