You can deploy a wide range of configurations depending on the type of system you need. A development and test system is typically 1, 2, or 4 vnodes, while a high-performance production system can have up to 128 vnodes, depending on your requirements and the system performance you want to achieve. For sizing, see https://spa.teradata.com.
The following diagram shows a sample configuration with two pnodes and TPAs representing the vnodes.
The following diagram shows a sample configuration with four pnodes and TPAs representing the vnodes. The diagram shows what the connection looks like after Teradata completes the configuration.