Since Teiid is installed in JBoss AS, there is no separate configuration needed on the part of the user to cluster the Teiid instances. See detailed JBoss AS instructions here. Just make sure that you installed Teiid in every JBoss AS node and started JBoss AS instances in the Domain mode before starting the cluster.
Typically users create clusters to improve the performance of the system through:
Load Balancing: Take look at the Client Developer's Guide on how to use load balancing between multiple nodes.
Fail Over: Take look at the Client Developer's Guide on how to use fail over between multiple nodes.
Distributed Caching: This is automatically done for you once you configure it as specified above.
Event distribution: metadata and data modifications will be distributed to all cluster members.
In the Domain mode, the only way user can deploy any artifacts is using either CLI or using the Admin API or Admin Shell. Copying VDB directly into the "deployments" directory is not supported.