Storage
area network (SAN) is a high-speed dedicated network of servers and shared storage
devices. A SAN provides storage and enables centralized data management. It
meets the storage demands efficiently with better economies of scalability and
also provides effective maintenance and protection of data. Network
attached storage (NAS) is a high-performance file sharing and storage device. NAS
allows its clients to share files with an IP address. In other words SAN and NAS both are network
technologies that allow you to manage the disk storage on your network. However,
NAS is a much simpler and less expensive than SAN.
Using
network attached storage actually reduces the task of adding storage to a
network because it eliminates the priority of configuring a network operating
system for routine file sharing tasks. A storage area network is designed for
managing very large amounts of network storage. A SAN contains three
components: storage devices (which could be hundreds of them), a separate
high-speed network (normally fiber-optic) that directly connects the storage
devices to each other, and on or more SAN servers that connect the SAN to the
local area network. The SAN server manages the storage devices attached to the
SAN and allows users of local area networks (LAN) to access the storage.
A
NAS is dedicated specifically to serving files. The hardware is optimized it
could have more network connections. Also its operating system is slim down so
that it is dedicated to sharing files and not performing other functions. People
use this device to store files that is accessible to other people. NAS uses
Linux, Windows, Mac share data, large files and backup locations. Typically with
SAN, servers access specific parts of the storage. Clients of SAN have storage
utilization of moving and reallocating storage. SAN also uses iSCSI and Fibre
channel. This is the protocol used to access your storage. iSCSI has a lower
cost that comes with a lower performance. Fibre Channel has a higher cost with
better performance.
If you need more of an overview check out this video!