In computing, a Storage Area Network
(SAN) is an architecture to attach remote computer storage devices (such as disk
arrays, tape libraries and optical jukeboxes) to servers in such a way that, to
the operating system, the devices appear as locally attached.
By contrast Network Attached Storage (NAS) uses file-based protocols
such as NFS or SMB/CIFS where it is clear that the storage is remote, and
computers request a portion of an abstract file rather than a disk block.
A NAS unit is essentially a self-contained computer connected to a network, with
the sole purpose of supplying file-based data storage services to other devices
on the network.
A general-purpose operating system is not needed on a NAS device, and often
minimal-functionality or stripped-down operating systems are used.
NAS
systems contain one or more hard disks, often arranged into logical, redundant
storage containers or RAID arrays . NAS provides both storage and filesystem.
This is often contrasted with SAN (Storage Area
Network), which provides only block-based storage and
leaves filesystem concerns on the "client" side. Despite
differences SAN and NAS are not exclusive and may be
combined in one solution: SAN-NAS hybrid
Nas
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