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In this paper we have discussed about the need of effective information management, Storage area network (SAN). SAN is the hottest buzz word in the computer storage business today. It seems like every company with a storage product, from the smallest garage shop to the largest multi-billion dollar corporation, has a SAN strategy, along with all of the products that today's business owners and IT managers absolutely need to run their business in a SAN environment. It is a high-speed network of storage elements, similar in form and function to a LAN that establishes direct and indirect connections between multiple servers and multiple storage elements. This paper covers the basics of Fibre Channel Storage Area Network (FC SAN), Internet Protocol Storage Area Network (IP SAN), concepts of Zoning and Logical unit number (LUN) masking. The comparison of various vendors EMC, IBM, HP that provide the services of SAN.