Can you provide any reference materials on why NAS is better as compared to general-purpose servers?
I would suggest you go to the Network Appliance Web site and download some of their articles or do a search. They have been at it for a long time and certainly have created a lot of information. As usual, some of it is marketing material but there are useful pieces.
In general NAS requires less administration (both installation and ongoing) than using a standard file server and many times the NAS device is optimized for file serving so that it gives an advantage over a standard file server in same cost range. The NAS device usually doesn't allow administrators to load other programs or do other things on it that improves the reliability as well.
Evaluator Group, Inc.
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This was first published in August 2002