Background
Data storage technology over the years has evolved from a direct attached storage model (DAS) to two other means of connecting applications to their storage – namely Network Attached Storage (NAS) and a Storage Area Network (SAN). Since all three techniques generally differ after the file system API level, it is possible to move between these different storage models with minimal or no impact to the applications themselves and without requiring a re-write of the application unless an application has been communicating directly with the storage hardware and not going through a standard operating system supported interface.
Read more about this topic: File Area Network
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