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Global clusters provide the ability to fail over applications between geographically distributed clusters when disaster occurs. You require a separate license to configure global clusters. You must add this license during the installation.
If you choose to configure global clusters, the installer enables you to choose whether or not to use the same NIC, virtual IP address, and netmask as are configured for the ClusterService group, which are the defaults. If you choose not to use the same networking information, you must specify appropriate values for the NIC, virtual IP address, and netmask when you are prompted.