From page 12 of “Veritas Cluster Server Agent for Oracle Data Guard Installation and Configuration Guide”

Typical Oracle data Guard setup in a VCS cluster.

                Clustering in a Data Guard environment typically consists of the following
                 hardware infrastructure:

          ■ The primary database instance (db1) sends redo data across a TCP/IP link to
                      a standby database instance (db2). A local cluster protects the primary database
                      and makes it highly available.

          ■ The standby database instance applies the redo information to a physical copy
                    of the primary database.

          ■ The primary and standby sites must be connected through a single TCP/IP
                    network connection. This link can be shared with VCS global clusters for
                    heartbeat communication.

          ■ Network heartbeating between the two data centers to determine their health;
                   this network heartbeating could be LLT or TCP/IP.

Based on the above definition, with VCS one primary database can have only one dataguard resource setup.

If there are multiple primary databases in the same VCS, you can have multiple associated dataguard resources if your hardware can handle the work load.