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The platform uses configuration properties to control the number of concurrent operations for a hypervisor or provider, device, or backup manager.  The platform can control concurrency for VM operations and many kinds of entities associated with VMs (firewalls, load balancers, NAT IPs, and backups).

You can now define limits for specific hypervisor type or provider (e.g. vCloud with no concurrency) without affecting other types (e.g. ESXi with maximum concurrency).

And you can also change the context of concurrency control to the VDC level. This means that the platform can limit concurrent operations that affect the same virtual datacenter, while allowing concurrent operations to other VDCs. You set limits at the platform or provider level, and the platform applies these limits PER VDC.  

You can also allow concurrent operations that change the state of a VM (e.g. power on), while limiting concurrent configure operations.

For a description documentation of the individual concurrency control properties, see the "openSession" properties at Abiquo Configuration Properties#virtualfactory