Before deploying Teradata Database, you must create a placement group. Using placement groups for Teradata Data Mover, Teradata Server Management, and Teradata DSC instances can improve performance.
After creating a placement group, you can deploy multiple instances in the same group. When deploying a Teradata ecosystem, you can launch Teradata Database, Teradata Data Mover, and Teradata DSC in the same placement group. Use placement groups for these products, especially if you plan to move large amounts of data.
Teradata recommends using the same instance types within a placement group, since mixing instance types may result in AWS insufficient capacity errors. After deploying an instance, you should not modify the placement group.
For information on creating or deleting placement groups and placement group limitations, see Amazon User Guide for Linux Instances .