Compute zones can be used to create different tiers of service - for example, by setting up different zones for high-performance Compute resource servers, with different prices for virtual servers deployed on that zone.
Compute zones can have data stores and networks attached to them. The combination of Compute resource, data store and network groups can be used to create private clouds for customers.
If there is only one Compute resource located in the Compute zone, it will not be marked as offline during the management network failure. This in an expected OnApp behavior.