This section provides the background information on single and multiple AWS availability zones that CDP Operational Database (COD) supports.
COD in a single AWS availability zone
Without multiple availability zone based deployments, CDP Control Plane deploys COD and Data Hubs into a single subnet, meaning that each of them has VMs spread across a single availability zone (as on AWS every subnet is related to a single availability zone).
COD in a multiple AWS availability zone
If you choose to deploy your COD Environment and Data Hubs across multiple subnets and availability zones (multi-AZ), each of these components could be spread across two or more availability zones, providing high availability, resilience and fault tolerance.