Storage Area Network (SAN)

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Storage Area Network (SAN) By Sai bala subrahmanyam

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SAN Storage Area Network Management By A.Sai Bala Subrahmanyam MCA

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Introduction to SAN A " SAN " ( Storage Area Network ) is a complete storage network. A SAN is a complete architecture that groups together the following elements: A fibre channel broadband network or SCSI Dedicated interconnection equipment ( switches , bridges , etc.) Network storage elements ( hard drives ) A SAN's architecture works in a way that makes all storage devices available to all servers on a LAN or WAN . As more storage devices are added to a SAN, they too will be accessible from any server in the larger network . In this case, the server merely acts as a pathway between the end user and the stored data.

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The SAN's performance is directly linked to that of the type of network being used. In the case of a fibre channel network, the bandwidth is approximately 100 megabytes/second (1,000 megabits/second) and can be extended by increasing the number of access connections. A SAN's capacity can be extended almost limitlessly and can reach hundreds and even thousands of terabytes. Using a SAN, it is possible to share data between several network computers without sacrificing performance because SAN traffic is completely separate from user traffic. These are application servers that act as an interface between the data network (usually fibre channel) and the user network (usually Ethernet ). On the other hand, it is much more costly to acquire a SAN than a NAS because it is a complete architecture that uses technology that is still very expensive. Often when a company figures out the TCO in terms of cost per byte, the cost can be more easily justified. Advantages and Disadvantages

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