Resource Groups
A resource group is a set of compute, networking, and storage resources dedicated to tenant workloads and managed by a single vCenter Server / NSX Manager pair. vCloud Director manages the resources of all attached resource groups through API communication with vCenter Server and NSX Manager.
Provisioning resources in standardized groupings provides a consistent approach for scaling vCloud environments. A separate vCenter Server instance is recommended to manage resource groups for all except very small environments. If a single vCenter Server is used to manage both management components and resource groups, place all vCloud management components in a separate cluster.
The decision to create a new resource group instead of scaling out an existing resource group is based on:
• Fault zone domain separation
• Multisite requirements
• Scalability limits (both for virtual and physical components)
• vCloud Director object boundaries (provider VDCs or organization VDC networks cannot span vCenter Server domains)