Along with the technical development of calculator and extensive pplication, save the technique to have already got industry and each ones to apply the value of the realm professional.The quick growth of the data quantity for the centralized management that the development of the business enterprise put forward the different from request, how insure the consistency, safety and credibilities of the data, how realization data of new problem, how carry out the data on the network concentration interview, how carry out the data interview and the protection etc.s of the different host type.All these all call the new network emergence of the saving technique and its product. SAN and technique of NASs and the emergence of the products not only expanded the space of the network development only, more important is, they put together the network technique and newly arisen and saving realms organically knot, rising the function that can't neglect in IT industry develop process.

The SAN interview of the different from NAS was usually can still add mutually nicely by the one who see as two kinds of compete the technique, actually, twos, to provide rightness type data.The SAN aims at the amount of sea and faces to the data of the data piece to deliver, but the NAS then provides the data interview function of the document class.

These two kinds of techniques not only can satisfy the demand of vivid and saving interview, but also SAN and NASs all according to open of, the network agreement of the industry standard:Used for the SAN fiber-optic passage agreement and used for the NAS network agreement.( such as TCP/ IP)The SAN application is more extensive, and can provide the application to the equipments of NAS of savingly, but the NAS is limited by the document series generally and only according to the interview.If take no account of their difference, the SAN and NASs all develop the important function in the business enterprise class of today save, comparing the traditional server conjunction to save to own more advantages.

The SAN and NASs is saving to traditional server conjunction at the data center realm is powerful complement and act for.As a result, the business enterprise class customer knows gradually its numerous advantages, include the vivid, more convenient and saving deployment of the improvement, and much lower and total own the cost.Though the SAN and technique of NASs can provide the competitive advantage, but they are all for particular environment and application but design of.

SAN key characteristic

The SAN is the network infrastructure, for provide vivid, high performance and high expand the saving environment of sex but design.The SAN passes to attain this purpose at server and its realization of saving equipments( for example disk saving system and the magnetic tape database) conjunctions.

The fiber-optic passage of the high performance exchange the machine and the fiber-optic passage network agreements and can insure the equipments conjunction since credibility and valid.These conjunctions take native fiber optic or SCSI( pass the SCSI- to- Fibre Channel conversion machine or the net passes)s as the foundations.An or many fiber-optic passageses exchange the machine with the network TUO rushes toward( SAN structure) the form for the host server and saving equipments provide with each other LINK .

Because SAN is for deliver the big piece data but carry on in the server and saving of the equipments excellent turn of, so SAN for the following application to say that is an ideal choice:

The key mission database is applied, among them can anticipate of respond to time, can use sex and can expand sex is an essential element.
The saving backup of the concentration, among them, the function, the data consistency and credibilities can insure the safety of the business enterprise key data.
High can cut over with sex and breakdowns the environment can insure the much lower cost, higher of applied level.
The expansive saving conjecture turn, can make saving and direct host conjunction separate mutually, and insure the dynamic state saving cent area.
The disaster of the improvement permits the wrong characteristic, linking of the equipments distance that provides the fiber-optic passage high performance and expands in the host server and it.( attain 150 kilometers)

SAN main strength

Face the saving need of the data of the quick growth, the large business enterprise and services provide the company to start choose the SAN to be the network infrastructure gradually, because the SAN have outstanding can expand sex.In fact, the SAN compares the traditional saving structure to have more obvious advantages.For example, the traditional server conjunction save to be usually more difficult than the renewal or centralized managements.Each time the set server musts close and then can increase and install lately saving.Compare but talk, SAN need not machine of yin and break off and can immediately increase with the conjunction of the server saving.SAN can also with the centralized management data, thus lowered total own the cost.

Make use of the fiber-optic passage technique, the SAN can deliver the data piece availably.Pass the support at saving deliver the amount of sea data piece with of the server, the SAN provided valid way of the data backup.Therefore, used for the network bandwidth of the data backup's can economize down to used for other applications in the tradition.

Open of, the industry standard of fiber-optic passage technique still make the SAN very vivid.The cable that SAN overcomes the tradition to ascend to connect with each other with SCSI limit, expanding the server biggest and saving of the distance of, thus increased more conjunction of possibility.Improve of expand sex to still simplify the deployment and upgrades of the server, protect the investment of original hardware equipments.

In addition, SAN can with saving network environment of control betterly, in keeping with those according to trade of the systems are in the function and can use the needs of sex.The SAN makes use of high credibility and the fiber-optic passage of the high performance agreement to come to satisfy this kind of demand.

SAN another strength is the transmission data piece arrive the business enterprise series according to the intensive applied ability.In data deliver process, SAN in correspond by letter knot order( is a server particularly) of the processing expenses expense is less, because data while deliver is be divided into smaller data piece.Therefore, fiber-optic passage SAN it is very valid while delivering the big data piece, this make fiber-optic passage the agreement is applicable to very much saving intensive an environment.

Today, the SAN is already gradual to combine together with environment of NAS, to provide the high performance sea of used for the equipments of NAS quantity saving.In fact, many SANs all used for the backstage of the equipments of NAS currently, satisfying to save the demand of expand sex and backup.

The advantage that SAN bring

SAN an advantage raised the credibility of the business enterprise data backup and the instauration operation biggest and can expand sex.According to the SAN operation ability obvious decrease backup and time of the instaurations, reduce the information discharge of the business enterprise network at the same time.

Pass to expand the SAN to the city area net infrastructure up, the SAN can also have no with the long range equipments to sew a ground of conjunction, thus improving the ability of permit the disaster.The SAN deployment city area net infrastructure with the distance of the increment SAN equipments, can attain 150 kilometers, and almost will not lower the function.The business enterprise can make use of this, passing to deploy the key mission application and used for the long range data replication of the key application server to raise to permit the disaster ability.The backup and the instauration equipmentses are demands that carries out the long range management.

Moreover, according to the database that trade the application benefits from the SAN deployment rather many.It did not sew the ability that increment save and can reduce time of the data backup.

Existent problem of SAN

Be close to two in the last yearses, SAN this reads all already gradually into public.The SAN can replace according to the saving mode of the server, the function is more superior.However, up to now, with each other the operability is still to carry out the process in the existent key problem.The SAN lacks the standard, is also such on the management particularly.Although the fiber-optic passage( the Fibre Channel) technique standard really exists, the each factory is different and hermeneutic, hence, with each other the operability problem is like the sandstorm similar rush toward right against the face, let person the 猝 can not compare with defend.

Some factories of SAN pass SNIA etc. organization to draw up the standard.Have some the factory to then begin to invest to build strongly with each other the operability laboratory, carry on the test before release SAN.Another path woulds be a SAN.Though the factory of SAN have already obtained the progress in resolve with each other the operability problem, however, the expert still suggests a method of the customer adoption, not want that the oneself's construction SAN.

NAS key characteristic

The solution of NAS usually installs for the equipments of be the document service, passing the network agreement( such as TCP/ IP) and the application procedure( such as the network document system NFS or the in general use Internet document system CIFS)s from the work station or server to carry on the document interview.Most NAS conjunctions share of the equipments to carry on in the work station customer's machine and the NAS document.These conjunctions depend on to come to normal movement in the network infrastructure of the business enterprise.

For the sake of the exaltation system function and without a break customer interviews, the NAS adopts the operate system that profession turn to used for the interview of the network document, these operate system since the document interview of the support standard, also support the homologous network agreement.

The NAS make the document interview's operation faster, and be easy to toward infrastructure to increase the document saving capacity.Because what NAS pay attention to is the document service but is not the performance circumstance of the actual document system, so equipments of NAS usually is from include of, and be easy to the deployment very.

Of the equipments of NAS and customer's machine mainly is to carry on data's deliver.A great deal of data that deliver on the LAN/ WAN today was be divided into many small data piece.The processing process of deliver needs to take up the processor resources to break off and re- visit the data to flow.If the processing that data wrap takes up too many processor resourceses, then the applied procedure circulate on same server will be subjected to the influence.Because the network hugs to block up the function of affect the NAS, so, its function limits one of sexes is the ability that the network delivers the data.

The NAS is saving of can expand sex to also be limit by the equipments size.Increase another one set equipments is very easy, but to be like to visit a the data of the pedestal machine to visit the contents within the network environment so also not easy, because the equipments of NAS usually has the special network marking sign.Because above-mentioned these limit, the data in the environment of NAS backup is not a concentration to turn of, so only be limited by to use direct conjunction equipments( such as the appropriation tape drive or the magnetic tape database) or according to the strategy of the network, in that strategy, the data on the equipments carries on the backup through business enterprise or the appropriation LANs.

NAS and the differentiation of the method of DAS

Be a kind of newly arisen and saving technique, the NAS has the advantage that traditional direct conjunction method can't compare to.A rightness of these two kinds of methods of table carried on a simple comparison.

The table 1 NAS and DAS comparison
The additional and saving( NAS) direct conjunction of network is saving( DAS)
The concentration that passes the document system turns the interview that the management can carry out the network document. The host that can pass to link with it only carries on the interview.
The customer can share the document system and look into the commonly shared data. Each host manages its document system, but fall through with other host share datas.
The document server that profession turn combines together with saving technique, visitting the data of provide the high credibility for the network. Can depend on the saving equipments only to provide the data of high credibility for the host.

NAS technique characteristics

The NAS provided for those business enterprises environments that visit and share a great deal of document system data an efficiently, the function price compares the excellent solution.The integration of the data reduced the management need and expenses, but the network document server and saving environments that concentration turn- include the hardware and softwares- insured the dependable data to interview and data high and can use sex.Can say, the NAS provided one comprehensive mechanism that is powerful.

The technique of NAS can satisfy the particular customer need.For example when some business enterprises need to cope with the problem of the fast data growth, or is resolve mutually independent work environment bring of When the system limit, can adopt the new generation NAS technique, make use of the network document that concentration turn the interview mechanism and share to resolve these problems, thus attain to reduce the system management cost, the purpose of the exaltation data backup and the instauration function.

NAS main strength

The NAS is applicable to those demands to deliver the document data to many customers with on board pedestal customer through a network.The equipments of NAS can produce result nicely in data must the environment of the long pull transmission.

In addition, the equipments of NAS is easy to the deployment very much- can make host of NAS, customer's machine and other equipmentseses distributed extensively in the whole network environment of business enterprise.Carry on with accuracy after install, the NAS can provide the dependable document series according to the integration, because the document target to is handle by the equipments oneself.Though it deploy very in brief, but the business enterprise still needs to insure install to provide in the process in the equipments of NAS appropriate of safe Class of document.

The advantage that NAS bring

The NAS apply in efficiently of in the document share mission, for example CIFS within the NFS and the Windows in the UNIX NT, among them targetted to provide the high class to erupt to visit the protective function according to the document class of the network.The equipments of NAS can carry on excellent turn, send out the document information toward many pedestal customer's machine with the document class protection.

Under the condition of some, business enterprise can with limitedly for the database applies to deploy the solution of NAS.These circumstances be limited by the following application generally and only:A great deal of data interview reads only;The database is very small;The logic book that to visit is also few; The function request is also not high.In these case, the solution of NAS contributes to reducing the customer total to own the cost.

With each other for two kinds of techniques of the complement

Though they exist the differentiation, but the SAN and NASs are two kinds of with each other for saving technique of the complement.For example, the SAN delivers and expands sex aspect performance in the data piece excellent, and can manage the equipments availably.Business enterprise can from use SAN is is applied in the key mission applied, saving concentration, backup instauration and high can sex calculation etc. is subjected to the benefit everlasting.

Compared with the SAN, the NAS support has another the document between on an equal footing customer's machine of set share.Customer's machine of NAS can in the business enterprise any location visits the commonly shared document.Because a less of logic in Chinese an interview of the NAS environment, for respond to time request and is also not very high, so its function and distances request is also opposite and lower.

The table 2 SANs and NAS key characteristics compare
SAN NAS
Negotiate the Fibre Channel Fibre Channel- to- SCSI TCP/ IP
Apply* the key mission, according to trade of the database application processing
* Concentrated data backup
* The disaster instauration
* Saving concentration* NFS and the document in the CIFS share
* The fraction of the long pull delivers according to the piece
* Limited of only read the database interview
Advantage* high can use sex
* Dependable sex that data deliver
* Reduce the far network discharge
* Install vivid
* High performance
* High can expand sex
* Centralized management* the restrict of the distance is little
* Simplify the share capacity of the additional document
* Be easy to the deployment and managements

The NAS and many original differences between SANs start disappear.For example, gradual adoption SAN of equipments of NAS to resolve and save to expand to recover the related problem with backup.Though these two kinds of techniques are similar, but the NAS can't provide the overall business advantage that SAN bring.However, save with traditional server affixture to compare, ignore to is a SAN or techniques of NAS and can reduce the customer total to own the cost, and can provide the better investment repay.