What is Storage Area Network (SAN) and Network Attached Storage (NAS)

 Storage Area Network is dedicated high speed network that provide access to block level storage. SANs were adopted to improve application availability and performance by segregating storage traffic from rest of the LAN.

SAN and  Network Attached Storage (NAS) are both network based storage solution. 

SAN typically uses fibre channel connectivity, while NAS typically ties into to a network through a standard Ethernet connection. 

A SAN stores data at the  block level while NAS access data as files.

To a client OS, a SAN typically appears as a disk and exists as it's own separate network of storage devices while NAS appears as a file server.

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