Architecting a vCloud Director Solution : vCloud Director Design : 7.3 Organization Virtual Data Centers : 7.3.2 Elastic Allocation Pool VDC
   
7.3.2 Elastic Allocation Pool VDC
The following are elastic allocation pool VDC design considerations:
Allocation pool Org VDC can spread over multiple resource pools/clusters of the provider VDC.
vCPU speed in GHz must be specified (default 1 GHz). This unit is used to calculate how many vCPUs can be deployed into Org VDC (allocation (GHz) / vCPU speed (GHz)).
Tenant cannot over allocate memory or vCPUs.
One vCPU is not limited by the defined speed of vCPU. Instead, vCPUs share all allocated GHz.
VM memory overhead is not charged to tenant.