A storage area network (SAN) is a high-speed block-based storage network that provides access to data storag . It connects servers with storage devices like disk arrays, RAID hardware, and tape libraries. In these configurations, the server’s operating system views the SAN devices as if they were directly connected. The data stored on those devices is then made available to all authorized users on the network, even if they’re in a different part of the data center or office building.
A SAN leverages a high-speed architecture that connects servers to their logical disk units (LUNs). A LUN is a range of blocks provisioned from a pool of shared storage and presented to the server as a logical disk. The server partitions and formats those blocks—typically with a file system—so that it can store data on the LUN just as it would on local disk storage.