All VM hosts that you include in a resource group must reside in the same Cloud Manager zone. Additionally, the hosts should be identical in terms of hypervisor technology, operating system version, network configuration, storage repository configuration, and hardware capabilities. This ensures a consistent environment for business services regardless of the host. It also ensures that the resource group’s service levels apply to all hosts.
As an example, you might create a Business Critical resource group that consists of high-performance hosts intended for mission-critical applications and services. You assign the resource group a Platinum service level with costs that reflect the more expensive hardware and service contract. Any business service that is provisioned to the resource group also inherits the resource and service costs.
Or, you might create a Lab resource group that consists of standard-performance hosts intended for software testing. You assign the resource group a Bronze service level with costs that reflect the less expensive hardware and service contract.