Traditional file systems are either unable or ineffective at supporting file sharing. The few file systems that support file sharing, such as NFS, rely on the LAN for moving files around to different host machines. In a collaborative environment, using the LAN for shared storage traffic can saturate your network, resulting in users that spend much of their day waiting on files to be saved or loaded to their workstation. These problems force system designers to use direct attached storage in situations where file sharing would be more efficient or to accept that the file servers will slow users down.
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