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Why use NAS for file access, why not SAN?

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linux-howto

http://serverfault.com – SAN is block level, NAS is file level. Block level means applications access blocks,while in file level they use files. Now, we can also create file system on server operating system for block level storage, so what is the advantage of using file level access with NAS. Please clear my doubts and mistakes. (HowTos)