METHOD AND APPARATUS FOR DYNAMICALLY ADJUSTING RESOURCES ASSIGNED TO PLURALITY OF CUSTOMERS, FOR MEETING SERVICE LEVEL AGREEMENTS (SLAS) WITH MINIMAL RESOURCES, AND ALLOWING COMMON POOLS OF RESOURCES TO BE USED ACROSS PLURAL CUSTOMERS ON A DEMAND BASIS

A method (and system) for managing and controlling allocation and de-allocation of resources based on a guaranteed amount of resource and additional resources based on a best effort for a plurality of customers, includes dynamically allocating server resources for a plurality of customers, such that the resources received by a customer are dynamically controlled and the customer receives a guaranteed minimum amount of resources as specified under a service level agreement (SLA). The best effort is defined in the SLA as a range of service to be provided to the customer if server resources are currently available.