What is NAS gateway anyway? Is it a front-end NAS device which will be attached to the existing LAN, while it is...
also connected to the SAN at back-end? Does it create a bridge in between an existing LAN and SAN, in order to be able to access block-level type of data?
In any case, the file serving function is the same, and it appears to clients accessing it as another file system that can be mounted or shared. They cannot tell the difference between a gateway or a standard NAS device.
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