In VMware Cloud Foundation, after preparing all the ESXi hosts and the network for multiple availability zones, you turn on and configure vSAN stretched cluster in the NSX-T workload domain. Procedure Enable vSAN Stretched Cluster on the NSX-T Workload Domain ClusterIn VMware Cloud Foundation, after you configure Availability Zone 2 and deploy the vSAN witness appliance in a third location, turn on the vSAN stretched cluster functionality, and set fault domains and the vSAN witness host. Turn on the vSAN Performance Service for the Cluster for an NSX-T Workload DomainIn VMware Cloud Foundation, to monitor the performance of the vSAN stretched cluster, hosts, disks, and VMs, turn on the vSAN performance service. Update the vSAN Storage Policy for an NSX-T Workload DomainIn VMware Cloud Foundation, to tolerate an availability zone failure, update the vSAN storage policy of the domain cluster for a secondary level of failures. Update the vSphere Availability Settings of the Cluster for an NSX-T Workload DomainIn VMware Cloud Foundation, after you configure the vSAN stretched cluster, you change the admission control policy to reserve 50% of the capacity to support recovery if an availability zone failure occurs.