It is possible to add disk to an existing configuration if the physical configuration has room. The disks are physically added to the platform and the TVS subsystem is told about their existence. TVS then hands out the space equally to the AMPs within the clique. The same amount of physical disk needs to be added to each clique.
As Dieter said, this is a rare path in the Teradata customer base. In general, when a customer needs more space, they also need more IO and more CPU to process the additional data, users and applications. New node(s) give a balanced complement of all three to the system rahter than expanding disk space without providing more IO and CPU.
In either case, the updatespace utility will change the available space in DBC once the physical upgrade has been completed. Once the space is in DBC it can be handed out to user databases in the usual way.
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