What is Network Attached Storage (NAS)?
NAS is shared storage on a local area network. A NAS server is a storage appliance that consists of a high performance file server that plugs into a LAN. Unlike a general-purpose server, such as a Unix or NT server, an NAS server is a specialized appliance optimized for file serving, i.e., storing, retrieving, and serving files. An NAS server has software only for file serving. NAS servers use small, specialized, and proprietary operating systems instead of general-purpose operating systems (OSs) such as the UNIX and Windows NT operating systems. Compared to the general-purpose OSs, NAS server OSs are smaller, faster, and optimized for the specialized task of file serving. NAS servers support a variety of network file protocols such as Sun’s Network File System (NFS) and Microsoft’s Server Message Block / Common Internet File System (SMB/CIFS). NAS severs use open standard protocols, which allow them to interface with multiple types of client computers and operating systems.