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If you are currently running a VCS cluster, including a VCS global cluster, you can run the installer to upgrade to VCS 5.0. The program detects the current configuration and prompts you to indicate whether you want to upgrade. While the installer is not able to verify the validity of the existing configuration, it is able to run extensive upgrade requirement checks before proceeding.
See About the VCS installation program.
If you want to upgrade from an earlier version of VCS to VCS 5.0 and use the Global Cluster option, you must first upgrade to standard VCS 5.0. After adding a license for the Global Cluster option, you can run the gcoconfig wizard. Note that the Global Cluster option requires a VCS HA/DR license. See the Veritas Cluster Server User's Guide for instructions.