DC clouds must adapt to the continuous changes of individual tenants’ requirements for storage

computing and network resources to improve resource utilization. In addition

DC clouds must provide data isolation among tenants that share cloud resources to improve security. To meet all those needs

DCs are gradually deployed with technologies for virtualizing storage

computing and networking resources. Under this background

security products must have their own virtualization architecture to meet the requirements of DC virtualization

and provide on-demand security resource deployment

fast delivery

and comprehensive protection.