Architecting a vCloud Director Solution : Deployment Model Considerations : 3.1 Service Offerings : 3.1.2 IaaS Multiple Availability Zones : 3.1.2.1 Distributed Resource Groups
   
3.1.2.1 Distributed Resource Groups
With a distributed resource group, each set of resource groups is in an availability zone together with its management components, as shown in the following figure.
Figure 2. Distributed Resource Groups
 
Cloud management components are located in a primary site. In the event of a disaster or outage, the management components can be failed over to the secondary site to reduce downtime. Resource groups and their management components are isolated per availability zone with no failover. Downtime in an availably zone would mean complete downtime for the resource group, but not for the cloud management components.
Advantages of this design:
Access to the cloud management components is provided even in the event of failure.
With proper application design, the tenant can avoid application downtime.
The service provider can offer a disaster recovery service.