Storage Area Network (SAN) is a collection of computers and storage devices, connected over a high-speed optical network and dedicated to the task of storing and protecting data. SANs support disk mirroring, backup and restore, archival and retrieval of archived data, data migration from one storage device to another and the sharing of data among different servers in a network. SAN uses a fibre channel for the communication between the devices. Devices in a SAN are usually bunched closely together in a single room, but the network allows the devices to be connected over long distances.