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A storage-area network (SAN) is a dedicated high-speed network that interconnects and presents shared pools of storage devices to multiple servers. This allows each server to access shared storage as if it were a drive directly attached to the server.
The main benefit to using a SAN is that raw storage is treated as a pool of resources that can be centrally managed and allocated on an as-needed basis. SANs are also highly scalable because additional capacity can be added as required.