The complexity, cost, and proprietary nature of SANs have driven the need for a better, or at least more cost-effective, solution to managing storage growth. NAS provides a way to simplify storage expansion in a cost-effective manner where lightning-speed performance may not be needed. It makes it easier for administrators to add storage by providing a disk storage “appliance” for users to simply plug into the network cable and make available. In this sense, NAS could stand for network appliance storage, and, in fact, a company emerged in the NAS business named simply Network Appliance [NetApp01]. The company, often referred to as simply NetApp, has been a leader in enterprise and corporation implementations of NAS.