You can stretch a vSAN cluster (OSA only) in a 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.
Note: You cannot stretch a cluster in the following conditions:
- The cluster uses vSAN ESA.
- The cluster has a vSAN remote datastore mounted on it.
- The cluster shares a vSAN Storage Policy with any other clusters.
You may want to stretch a cluster for the following reasons.
- 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.
This release of VMware Cloud Foundation does not support deleting or unstretching a cluster.