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Storage Industry Overview
4.2 FAS (Fabric-Attached Storage)
The integration trend f NAS and SAN= FAS
As mentioned before, Dataquest classifies NAS and SAN as inside FAS, this is a better
definition method, it is generally called network storage system. The past
Fabric-Attached Storage concept were all based on Server-Centric, however, when
comes to NAS and SAN, they are changed to Storage-Centric. Simply speaking, NAS
storage system is based on TCP/IP network transmission, it can be connected directly
to the current Ethernet and is Plug & Play, therefore, it is cheaper; SAN network
architecture goes through channel based on high speed optical fiber transmission,
however, equipment such as network Switch needs to be added, the installation is
difficult and price high. Currently, many industry observers say, the border line between
NAS and SAN will become hazier and some of their characteristics will be integrated,
NAS will become part of SAN, that is, a storage sub unit; SAN will have centralized
management, low level NAS exists in distributed low capacity storage.
4.2.1 NAS (Network Attached Storage)
NAS is actually file share storage system in IP network. It has its own microprocessor,
Micro-Kernel Operating System, file management system, network card and one set of
built-in hard disc; what is special is that its operating system is burned into the firmware,
file system is used to set up driver software for data access, the file standard is based
on NFS of Unix server or CIFS protocol of Windows SMB. Since it is connected directly
to IP local area network (LAN), not like DAS which is connected to server, therefore, it
is like ”network neighbor” to the user, access to the data is very convenient. To MIS, the
installation process and management are simple too, no high learning cost is
necessary. Therefore, they are mainly used in environments such as: medium and
small sized enterprise, departments with high need in file sharing, not too many servers,
or heterogeneous platform, they can be expanded continuously.
The followings are advantages of NAS:
1. Since NAS is not connected to server, server’s performance is thus higher.
2. It uses current mainstream TCP/IP network for installation, no new storage
architecture installation is needed, its complexity of introduction is much less than that
of SAN.
3. It is compatible to heterogeneous platform and can be operated in different
operating system.
4. Plug and Play, expandable, high flexibility.
5. It is frequently used in low data amount but many persons environment, or larger
multimedia file which can not be transferred by Email, for example, Streaming,
Video/Audio or CAD/CAM.
6. Low cost.
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