Salvation Data 0800 075 0720

Our Address: Salvation Data 105 Upper Lisburn Road, Belfast BT10 0LG Email us 24x 7 at sales@salvationdata.co.uk

 

    Enterprise data store way divide into three, usually at present: DAS, NAS and SAN. hope through the introduction herein, small and medium-sized enterprises can elect the data of one's own heart appearance to store the way.

What are DAS, NAS and SAN?

DAS (Direct Attached Storage, hangs and stores outside directly) It is a kind of scheme of storing the way. The server structure of this kind of memory scheme is built up like the PC, the outside data store the apparatus (such as array of the magnetic disc, CD player, magnetic tape deck) Connect on the bus within the server directly, it is a part of the whole server structure that the data store the apparatus, same server bear whole datum of network store the duty too. DAS this kind connected with the way directly, transmits the demand in expanding, high performance of memory space that can solve the single server, and single platform external capacity of memory system, already from to 1TB, develop into 2TB, with the introduction of the hard disk of the large capacity, the capacity of external memory system of single platform will also rise. In addition, DAS can also form double machines based on array of the magnetic disc high and can use the system, meet data store to high requirement that can spend.

NAS (Network Attached Storage, network attached storage) Having improved less effective DAS in the past and stored the way in an all-round way, it adopted and was independent of PC server, a kind of file server stored and developed for the network data alone. All network data of centralized connection store the apparatus (such as various magnetic disc arrays, tapes, CD players) in NAS server ,Memory capacity can be expanded well because at the same time because this kind of network stored the way and is born independently by NAS server, what influence so, there is not the server performance to original network, so as to ensure the whole network performance is not influenced. It has offered a simple, high cost performance, high usability, high expanding and low network that always have cost to store the solution.

SAN (Storage Area Network, stores the land network) Do not install all memory apparatus concentratedly in a special NAS server, but store these the apparatus is joined through the optic fibre exchanger alone, form the network of an optic fibre passway, then it is joined and then there are LANs now with enterprises in this network, in this kind of scheme, that play a key role is certainly optic fibre exchanger, its support technology is a passway agreement of optic fibre, this is that a standard that ANSI sets up for network and passway I/O interface is integrated, support HIPPI, many kinds of advanced agreements such as IPI, SCSI, IP, ATM. In SAN, the data are stored in a manner to concentrate on, the ones that have strengthened the data are very managerial, the data met under many operating systems at the same time share the same memory pool, reducing always has cost.

What difference do DAS, NAS and SAN have?

DAS connecting with directly type stores and relies on the host operating system of the server to carry on IO of the data to read and write and store maintenance management, the data are backed up and resumed demanding to take up the servers host computers resources (including CPU, system IO etc.) ,The dataflow needs the host computer of reflux to reach the magnetic tape deck (storehouse) that the server is connecting again ,Data back up, take up server host computer 20-30% resource usually, so a lot of enterprise daily data of user back up often in night or business go on when being system heavy, so as not to influence the operation of the normal business system. Connect with data amount that type store heavy, time that back up and resume long directly, the greater dependence on hardware of the server and influence are. The scheme computer and server in early days use mainly, because strong to demand that data store at that time, the memory ability that the single server needs can meet the daily data and store the demand, so is quite general in low-grade network application.

NAS is as a network attached storage apparatus, the independent memory operating system optimized is put in NAS apparatus, can be effective, closely release systematic buses resources, spare no effort to support I/O to store, NAS apparatus integrate local spare software generally at the same time, can back up here through server NAS important data of apparatus, and NAS apparatus offers the hard disk RAID, redundant power, fan and redundant controller, can satisfy the steady application which guarantees NAS.

NAS apparatus mainly used for realizing the file-sharing application under different operating systems platform, compared with the situation that the traditional server or DAS stores the apparatus, the installation, debugging, use and management of NAS apparatus are very simple, adopting NAS can save certain equipment control and maintenance expenses. NAS apparatus offers RJ- to 45 interface and single IP address, can connect it on Hub of exchanger or other LANs of the backbone directly, through the simple establishment (for instance, set up IP address of the machine,etc.) Can insert area use NAS apparatus promptly, carry on network data need to stop either when the online dilatation promptly in network, thus guarantee the data are stored smoothly.

NAS data store the scheme and is designed on the basis of LAN, carry on communication according to traditional TCP/IP agreement, face news to transmit, carry on data transmission by way of I/O of the file. Under the environment of LAN, data grade share what NAS can well already be realized constructing differently between the platforms, sharing of platforms, such as Windows NT, Linux, UNIX,etc.. Because of these all sorts of reasons, it is quite low that NAS stores use to enterprise of the scheme and maintenance cost, can well be taken on by the existing network management person.

SAN is usually that SAN network based on optic fibre passway is linked to storing apparatus and server through a single one of one, so while having access demand for magnanimity data, the data can well be transmitted at a high speed between relevant servers and the backstage supporter's memory apparatus through SAN network, as to the thing that bandwidth of LAN it takes up to be zero nearly, and server can visit SAN any stores apparatus, have improved the usability of the data. Requiring higher occasion to performance and dependability, adopt advanced SAN data to store the network, can enable activity independence such as the memory, backup of the data except original LAN, thus lighten the load of LAN, will guarantee the going on smoothly of original network application; SAN network adopts the optic fibre to transmit the passway at the same time, can get the high-speed data transmission rate.

SAN scheme has simplified management and centralized control, this stores apparatus and concentrates on the information centre to all, have a realistic meaning very much. SAN separates the memory of enterprises and server platform, can realize 24 x 7 incessant systematic usability and centralized management, on the basis of this platform, can also employ a set of unified disasters to resume the solution, can expand the environment of storing in a speedy and economical manner at the same time. So SAN apply to non-linear editor, server cluster, long-range disaster recovery, Internet datum serve very much,etc. a lot of domains.

About the Author

MY blogs