Container Instances and High Availability
You can use High Availability using a container instance on 2 separate chassis; for example, if you have 2 chassis, each with 10 instances, you can create 10 High Availability pairs. Note that High Availability is not configured in FXOS; configure each High Availability pair in the application manager.
For detailed requirements, see Requirements and Prerequisites for High Availability and Add a High Availability Pair.