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Associating a world wide name (WWN) to a logical unit number (LUN) within a storage array is a way of implementing data security in the SAN. Each HBA in your servers connected to the SAN has a WWN.
Within the storage array, you can assign the WWN to a particular LUN so that even if zoning is not implemented in the SAN fabric, only that particular HBA will have access to that specific LUN. This is sometimes referred to as "LUN masking."
Chris
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The views and opinions expressed by Christopher L. Poelker are his alone and not necessarily shared by Hitachi Data Systems.
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