EXPERT RESPONSE
The gateway option is a NAS controller that uses your SAN storage. The big advantage of NAS over using a standard server as a file server lies in the "appliance-like" operation of NAS. There is very little administrative work to do and you don't load other software on it, which might reduce stability. So it's simpler to use and more stable. Seems like it would be a good choice if you were only going to do file serving.
Read Greg Schulz' answer to this question.
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