Creating an SDDC with a stretched cluster to span ESXi hosts between two or more AZs in AWS infrastructure provides additional protection for mission-critical workloads on VMware Cloud on AWS. This setup also enables hosting of clustered applications with demanding availability requirements. Note that the minimum number of hosts in the stretched cluster based SDDC is six. VM DRS anti-affinity rules must be created to enforce placing of VMs between hosts in different AZs.
NOTE: For VMs hosting Availability Groups workloads and utilizing the synchronous-commit mode, placement within different AZs may increase Commit Time and Harden Time for the remote replica, thus introducing latency into the workload.