Along with the growing amount of enterprise information, the traditional Storage media technology has already been unable to meet the demand of enterprise e strong, so the Network Attached Storage NAS (Network Attached Storage) become a rising star of the Storage technology, and at the same time use in DVR industry gradually. What is the NAS? What are the characteristics? How to use in the DVR products? This article will illustrate one by one.

What is the NAS?

According to the Network Storage Industry alliance (Storage Network Industry Association) definition: "the NAS is a link, through the Internet to provide file access and sharing between different computer systems of Storage devices."

Early server Storage systems, are stored in hard disk as the main body, the so-called Direct Attached Storage devices DAS (Direct Attached Storage) architecture, whether the use of hard disk Interface (Integrated Drive Electronics; IDE) or high speed parallel Interface device (Small Computer System Interface; the SCSI) of disk array (RAID) Interface, is to access data directly from the hard Drive.

At present, most of the enterprise will network disk is located in the server, through the local area network (LAN) or the remote data access. The most common practice is in Windows NT or UNIX NFS server set one up to a Shared Folder (Share Folder), then set different access permissions of the user. Although this is the most economical method, but because of sharing too much information, in addition to cause server performance fell sharply, even more information security concerns.

NAS can provide unlimited capacity expansion of the network information sharing mechanism, as long as any node even on the Internet, various operation platform of the computer system can by NAS devices, there is no limit to the distance of the file access service. Therefore, at the speed of today's digital information explosion, traditional storage media technology has been unable to meet the demand of enterprise e strong, so fast, and never stop, more storage space and economical NAS, become a rising star in the storage technology.

The characteristics of NAS

One, designed working (Dedication)

The NAS is an exclusive File I/O storage devices, in view of the network File server, disk read and write, network traffic, such as user authentication have optimal processing. Because to remove unnecessary services programs, software tools, an additional users will only take the smallest hardware resources, so between NAS can provide cross-platform file transfer and sharing environment.

General server's hard disk and hardware did not have the function of disk array and fault tolerance, so the failure can't do any remedy, can only do passivity and replacement of equipment downtime. Therefore, NAS can according to different requirements and choose the right combination of disk array, on the other soft/hardware at the same time to ensure the stability of data access.

Second, the Simplicity (Simplicity)

1. Easy installation, 30 minutes to complete the installed, and started to operate on the Internet. Compared to other spend hours to install the server, or a few months planning Storage solutions (such as Storage Area Network; SAN), NAS can be said is very convenient.

2. The operation is simple: most of the NAS have simple Web browsing interface, users can easily digestible, rather than to learn the professional knowledge such as Windows, Linux or UNIX after to get the management and operation of the server to the simple.

3. Easy to maintain, for many enterprise MIS information department, machine fault is a trouble thing, but for understanding the NAS users, like as easy to use home appliances.

Three, Diversity

1. Support network transmission protocol, TCP/IP, IPX, NetBEUI, AppleTalk.

2. The client operation system: support Microsoft Windows 9 x/ME/NT / 2000 / XP, Macintosh MAC OS 7 x / 8 x / 9. X/x 10. (x), Novell NetWare 3. 4 x/x / 5. / 6. X x, UNIX/Linux, Solaris 2.6/7/8, Red Hat, FreeBSD), etc.

3. The cross-platform file sharing: support Windows (CIFS/SMB), Apple (AFP), Novell (NCP), Unix (NFS), Internet (HTTP), etc.

4. In addition to providing backup mechanism or software, can also be compatible with other backup software.

Four, scalable

General enterprise information management is often due to a large increase, company information system not enough storage capacity. When new information is also not small, server hard disk drive is usually already full and unable to expand; But in order to store buying a hundreds of thousands of new server again, seems to make a mountain out of a molehill. And NAS capacity from 120 gb to several 120 bytes (Terabytes) have, no so-called expand capacity problems on practical application.

Five, low Cost

When companies or schools information storage space is insufficient, buying a new server or new hard disk, the biggest cost of consideration is IT personnel management maintenance costs (daily or weekly timing point of view management), once the data volume expansion, must be server downtime, and need to be high, a professional technical maintenance. But in terms of establishing NAS, does not need to network server downtime, only need basic technical management, a few minutes to the NAS server to connect to Internet, greatly reduce the cost of the IT staff to maintain.

The application of NAS in DVR

General 24 hours non-stop operation, monitoring and control system must be stored for a long time of video data, as a result of the traditional video monitoring system in the data storage and management is inconvenience, has been gradually replaced by the digital monitoring system.

At present, a lot of DVR has support HTTP and TCP/IP protocol, as long as the use of IP protocol, through the Ethernet combines NAS and DVR application. In short, as long as each give a correct IP and path set, in front of the DVR terminal users can surf the web, access files or data in NAS on the Internet. About the DVR with DAS Storage (NAS) and Storage equipment in the combination of the Internet and the China central television (CCTV) architecture.

NAS on CCTV application has the advantages of CCTV, architecture or DVR equipment users, such as general small and medium-sized enterprises and academic institutions have a chance to use the storage device. In general, the NAS has the following advantages: on the application of CCTV

1. To expand storage capacity of ductility;

2. The security of the data storage and convenience;

3. In the domain or end doing data access the Internet

4. The advantages of simple upgrade, management and maintenance.