You can stretch a cluster in the management domain or in a VI workload domain across two availability zones within a region. Both availability zones must contain an equal number of hosts to ensure failover in case any of the availability zones goes down.
- the cluster uses static IP addresses for the NSX-T Data Center Host Overlay Network TEPs
- the cluster has a vSAN remote datastore mounted on it
- the cluster uses vSphere Lifecycle Manager images
- Planned maintenance
You can perform a planned maintenance on an availability zone without any downtime and then migrate the applications after the maintenance is completed.
- Automated recovery
Stretching a cluster automatically initiates VM restart and recovery, and has a low recovery time for the majority of unplanned failures.
- Disaster avoidance
With a stretched cluster, you can prevent service outages before an impending disaster.