Computer memory and local storage resources may not be sufficient for enterprise applications in terms of storage, storage protection, multiple-user access, or speed and performance. As a result, most organisations use a SAN in addition to network-attached storage (NAS) to improve efficiency and data management. Traditionally, only a limited number of storage devices could connect to a server, limiting the storage capacity of a network. A SAN, on the other hand, adds networking flexibility by allowing one server, or many heterogeneous servers spread across multiple data centres, to share a common storage utility.
The Storage Area Network eliminates bandwidth bottlenecks by eliminating the traditional dedicated connection between a network file server and storage — as well as the concept that the server effectively owns and manages the storage devices. To improve storage reliability and availability, a SAN eliminates single points of failure. A Storage Area Network is also ideal for disaster recovery (DR) because a network may contain a variety of storage devices such as disc, magnetic tape, and optical storage. The storage utility may also be located far away from the servers it employs.
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