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What is storage area networks used for?

SANs are primarily used to enhance storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear to the operating system as locally attached devices.
A SAN typically has its own network of storage devices that are generally not accessible through the local area network (LAN) by other devices. 
The cost and complexity of SANs dropped in the early 2000s to levels allowing wider adoption across both enterprise and small to medium-sized business environments.

Best Uses of Storage Area Networks
Best Uses of Storage Area Networks
A SAN does not provide file abstraction, only block-level operations. However, file systems built on top of SANs do provide file-level access, and are known as shared-disk file systems.

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