You can change the SAN Shared Storage Option configuration through Backup Exec Utility (Beutility.exe). This utility allows you to assign a new database server and attach media servers to or disconnect them from the database server.
If the current database server is functioning, you should consider specifying the current database server when installing SAN Shared Storage Option to the new system. This will allow you to test the fibre connections before designating a new database server. If the current database server is not functioning, installing the new system as the database server is recommended.