A Storage Area Network (SAN) is a dedicated, high-speed network that provides consolidated, block-level storage to servers. The storage volumes (LUNs) are presented so that the operating system treats them as if they were locally attached disks. This architecture is common in data centers to improve performance, scalability, and redundancy. By contrast, network-attached storage (NAS) offers file-level access over standard network protocols, and direct-attached storage (DAS) connects drives directly to a single server without a network.
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What is a Storage Area Network (SAN) and how does it work?