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Is NAS a low-end technology?

I am trying to tell people NAS is not a low-end product and SAN is not necessarily high-end -- that it all depends on applications. Can you give me some arguments, or reference materials with which to make my argument?
Sure, you can buy relatively expensive NAS systems from Network Appliance, EMC or BlueArc and you can buy low cost SAN-in-a-can types of products from QLogic and a few other vendors. In general SANs have been expensive, but prices are dropping rapidly. The leaders in NAS have always been the more expensive systems that are packed with functionality, but there have also been inexpensive NAS products. Strangely enough, the inexpensive NAS products have been less successful in terms of overall business effectiveness.

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