vCloud Availability for Director services can be offered on top of existing vCloud Director environments. In such cases, VMware recommends provisioning a separate Org VDC with enabled replication next to existing regular Org VDCs. Tenants can run regular workloads or workloads that use application-level replication (for example Active Directory servers or SQL AlwaysOn Database cluster nodes) in the separate Org VDC. Org VDC networks can be shared among regular and replication-enabled Org VDCs.