KR20010081835A - Method and system of syncronizing billing data for duplicated automatic call distributer system - Google Patents

Abstract

The present invention relates to a method and system for server redundancy, and particularly, in case of system redundancy of an automatic call distribution device, even when a system failure of an active server or a standby server occurs, billing data can be transmitted to the charging centralization center at all times without any missing data. Provide billing data synchronization technology.

The present invention provides a first server or standby in an active state by including a reflective memory in which a redundant server is updated in real time so that charging data is stored in the data file of billing data stored in the local storage means of the server, respectively. In the recovery step after a system failure occurs in the second server in the state, write information of the charging data file stored in its reflective memory and writing information of the charging data file stored in the reflective memory of the other server currently active By comparing with, it is possible to identify the missing billing data generated during the disaster prevention, receive the data by FTP method and update and synchronize the billing data file stored in its local storage means.

Description

Billing Data Synchronization Method and System in Redundant Automated Call Distribution System {METHOD AND SYSTEM OF SYNCRONIZING BILLING DATA FOR DUPLICATED AUTOMATIC CALL DISTRIBUTER SYSTEM}

The present invention relates to a duplication technology of a network server, and more particularly, to a billing data synchronization method and system in an automatic call distributer system (ACD). will be.

The present invention relates to a method and system for redundancy of a network server, and particularly, in the event of a system failure in a host of an automatic call distribution device that is duplicated in an active and standby structure, stored in each server. The present invention relates to a method and system for synchronizing, preserving, and processing charging data.

Data communication using the network is now widely popularized, and various services are provided using the network, and users using the network service are also exploding. Therefore, in providing a network service, a technology of duplication of a network server providing a service for a more stable service is used.

In addition, instead of having a database of users on a network server, a database management server (DBMS) is managed independently of the network server to manage a large amount of user information. That is, the server of the automatic call distribution device is only responsible for providing various services to the telephone subscriber, and the billing data according to the use of the service of the user is transmitted to the database management server, and the user is charged for the use of the service.

In the case of an automatic call distribution device, the management and transmission of billing information of a telephone subscriber is necessary for accuracy and stability. Therefore, the process of creating and transmitting billing information to the centralized charging center is duplicated with active and standby structures, and the lines that transmit actual billing information are also duplicated with active and standby, monitoring each other and quickly switching in the event of a failure. To be stored and transmitted correctly.

1 is a block diagram of a system for transmitting charging information data of an automatic call distribution device according to the prior art. Referring to FIG. 1, the first server 120 and the second server 130 constituting the active server and the standby server include a first communication means 140 and a second communication means 150. The first server 120 currently operating as an active server provides a service to a user by using the network 110, generates a result of providing the service as data, and stores the result in a local storage means of the first server. 1 is transmitted to the database management server 160 via the local network (170). When the server duplication method according to the related art shown in FIG. 1 is applied to an automatic call distribution device, the database management server 160 becomes a central charging center.

The second server 130 monitors the system failure of the first server 120 through the first communication means 140, and transmits the data generated as a result of the service provision through the second communication means 150 to the first server. The data is received by 120 and stored in the storage means of the second server 130. When a system failure occurs in the first server 120, the second server 130 detects this through the first communication means 140 and switches itself to an active server to continue the service.

In addition, the first server 120 generates an alarm sound notifying the operator of the system failure. The second server 130 converted to the active server transmits the data generated as a result of the service to the database management server 160 through the second local network 180. At this time, when the active server transmits the service usage information data to the database management server 160 for the service case provided to the user, a huge traffic burden occurs on the database management server 160 receiving the data. The data for billing is transmitted at a predetermined time interval.

The server of the automatic call distribution device is a method of regularly transmitting the billing data every few hours or once a day to the database server for billing. Moreover, in the automatic call distribution device, the billing data must be kept without missing even in the event of a system failure, so that each redundant server stores the billing data in the local storage means even when it is in a standby state. I use it.

However, in the automatic call distribution apparatus according to the related art, the charging data processing method of the redundant server loses the identity of the data stored in the local storage means of each server when the active server is switched within the time interval period in which the charging data is transferred. There is a problem with synchronization.

2 is a diagram illustrating a data asynchronous problem of a local server that occurs when a redundant server is transferred during a billing data update period in the redundant server system according to the prior art. Referring to FIG. 2, reference numeral 200 is a diagram illustrating an operation state of the first server, that is, an active state, an off state due to a system failure, or a stand-by state. Reference numeral 210 is a diagram showing the existence of billing data stored in the local memory of the first server 120.

In the same manner, reference numerals 220 and 230 denote operating states of the second server and charging data writing states of the local storage means, respectively. Referring to FIG. 2, it is assumed that the first server 120 is initially in an active state and the second server 130 is in a standby state. That is, billing data is stored in the local storage means of the first server and the local storage means of the second server during the time period T ₁ 241 in which the first server operates normally as the active server.

When a system failure occurs in the first server at the time A shown in FIG. 2, the second server in the standby state detects the failure of the first server through the first communication means 140 and is performed by the first server as an active server. You will take over the process you were doing. On the other hand, the charging data 212 is not stored in the local storage means of the first server during the T ₂ time period 242 due to a system failure.

Therefore, when the first server is restored to the normal state at time point B and is switched to the standby state, and the state is changed to the active server at time point C, when the charging data is transmitted to the database management server at time point D There may be a problem that the charging data 212 corresponding to the T ₂ period is transmitted to the centralized charging center with a missing state.

To solve this problem, the prior art by the first server compares the system administrator from the B point to be returned to the normal state into the standby state having to the charging data of the first server and a second server, T _second interval 242 Has been used to synchronize the billing data stored in each local storage means by reading 232 the lost data 212 from the local storage means of the second server and storing it in the first server.

Therefore, in the server of the redundant automatic call distribution device, it is necessary to solve the billing data missing problem that may occur when a system failure occurs, and to manually check and update the billing data manually in the local storage means of the failed server. There is an urgent need for a new method of charging data synchronization that can solve the inconvenience of the prior art.

Accordingly, a first object of the present invention is a data synchronization method in which a network server duplication system can transmit the network service billing data to the database management server without missing data by maintaining the same data synchronized to the local storage means of each server. And to provide a system.

In addition to the first object, a second object of the present invention is to provide a data synchronization method and system which can synchronize and store data in a local storage means without loss even when a server constituting a network server redundancy system fails. .

In addition to the first object, the third object of the present invention can equally synchronize the charging data recorded in the local storage means of each server even in the case of a switchover due to a system failure in the redundant server of the automatic call distribution device. The present invention provides a redundant server apparatus and method.

1 is a block diagram of a server redundancy system according to the prior art.

2 is a view showing a state in which billing data is missing in the local memory of a server recovered from a system failure in the redundant server according to the prior art.

Figure 3 is a block diagram of a server redundancy system according to an embodiment of the present invention.

4 is a diagram illustrating an operation flow of a server redundancy system before a system failure occurs in accordance with an embodiment of the present invention.

5A and 5B illustrate a charging data synchronization method of a server redundancy system according to a first embodiment of the present invention.

6A and 6B illustrate a charging data synchronization method of a server redundancy system according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 300: network

120, 310: First server

130, 320: second server

160, 360: Database Management Server

170 and 340: local network connecting the first server and the database management server

180, 350: Local network connecting the second server and database management server

325: system failure monitoring monitoring means (heart beat)

330: data synchronization block

312, 322: hard disk (local storage means)

331, 333: Reflective Memory (RFM)

332: reflective memory connection transmission means (optical cable)

In order to achieve the above object, the present invention provides a multiplexing server system for providing a network service as a plurality of servers, the plurality of servers to drive the charging data processing process for the network service regardless of whether the active state or standby state A reflective memory configured to store billing data and file information of the billing data for a network service provided by a first server in an active state among the plurality of servers; Local storage means for storing the charging data in accordance with file information of the charging data; It provides a multiplexing server including a reflective memory data transmission means for connecting the reflective memory provided in each of the plurality of servers to each other to synchronize the contents stored in the plurality of reflective memories in real time.

In order to achieve another object of the present invention, in an automatic call distribution device, a method of synchronizing charging data stored in a local storage means included in each of a plurality of multiplexed servers with each other, the active server among the plurality of servers The billing data generated as a result of providing the service by the first server operating in synchronization is stored in the local storage means of each of the plurality of servers, and the state information of the billing data is stored in the reflective memory of each of the plurality of servers. Storing; When a failure occurs in the first server, a failure of the first server is detected through a communication channel for monitoring multiplexing, and the second server in standby takes over the service provided by the first server and generates a result of providing the service. Storing the charged data in a local storage means of a second server, and storing state information of the charged data in a reflective memory of the second server; The first server recovered from a system failure reads state information of billing data stored in the local storage means of the first server from the reflective memory of the first server, and reads the second server from the reflective memory of the second server. Read the state information of the data stored in the local storage means of the data, and compare with each other to recognize the missing charging data due to the system failure, wherein the first server is the reflective memory of the first server and the ripple of the second server And receiving the missing charging data from the second server through a communication channel for connecting a selective memory and synchronizing the charging data stored in the local storage means of the first server.

Hereinafter, an embodiment of a method and apparatus for synchronizing service usage information data of a redundant server according to the present invention will be described in detail with reference to FIGS. 3 to 6. The data synchronization technology of the server according to the present invention can be extended to a redundant server system or a system multiplexed with a plurality of servers. The data synchronization technique according to the present invention is described above by applying to charging data processing in a redundant server of an automatic call distribution device as a preferred embodiment, but the idea of the present invention is not only an automatic call distribution device but also a multiplexed active or standby server. It may be applied in cases where data generated by the program needs to be recorded and preserved without interruption.

3 is a system configuration diagram showing a preferred embodiment of the server redundancy system according to the present invention. Referring to FIG. 3, there is shown a network 300, a redundant first server 310, a second server 320, and a database management server 360.

The first server 310 and the second server 320 may be connected to the network 300 to provide a service to the user, and in addition to the hard disks 312 and 322 that may store service usage information data of the user. And a reversible memory (RFM) 331 and 333.

In addition, the first server 310 and the second server 320 may monitor the mutual system failure by exchanging a heart beat (325) for monitoring the system with each other. As a preferred embodiment according to the present invention, the system monitoring means 325 may be a local network using TCP / IP or UDP / IP protocol.

In addition, the reflective memories 331 and 333 may be mounted and used in the PCI slots of the first server 310 or the second server 320, respectively, and include a reflective memory mounted in each server; The RFMs 331 and 333 may be connected to each other through the optical cable 332. As a preferred embodiment of the transfer means 332 between the reflective memories according to the present invention, the above-described optical cable 332 transfers data at a high transfer rate of more than nanoseconds, so that each redundant server Data stored in the reflective memories 331 and 333 mounted in the 310 and 320 may be synchronized with each other in near real time.

As a result, when the first server 310 or the second server 320 is down to a system failure and the system failure is resolved and recovered, it may be updated with data stored in the reflective memory of the server that is not immediately down. . That is, the server having a system failure leaves the writing time and the sequence number of the billing data related file in the reflective memory 331, and receives the billing data information at the time from the other server by FTP in the recovery step. Match the charging information of the active process and the standby process.

The first server 310 or the second server 320 that provides a service of the server redundancy system according to the present invention uses the first local network 340 or the second local network 350 to manage the database management server 360. ) May transmit the service usage information data of the user. In the automatic call distribution system according to the preferred embodiment of the present invention, the database management server 360 may be operated as a centralized charging center, and the service usage information data may be billing data.

That is, the server duplication system according to the present invention can be applied to the duplication of an automatic call distributer (ACD), and the database management server 360 stores the charging data of the telephone subscriber.

4 is a diagram illustrating a workflow for synchronizing service usage information data according to the present invention. Referring to FIG. 4, a first server 310 is providing a service to a user using a network 300, and a second server 320 is a first server 310 using a system monitoring unit 325. Monitors system failures.

The first server 310 generates a service providing process 430 to provide various services, and generates service usage information data of the user. The service usage information data of the user according to the present invention may be billing data in the case of an automatic call distribution system. In addition, the first server 310 stores the service usage information data in the first RFM (reflective memory) 331 and mirrors the same charging data information in real time to the second RFM 333 connected through the optical cable 332. Stored in sync-like fashion.

In a preferred embodiment according to the present invention, the service usage information data stored in the first RFM 331 and the second RFM 332 is the name of the billing data file stored in the local storage means, that is, the hard disks 312 and 322. , Sequence ID (identification), and the like. Subsequently, the billing data processing process 410 of the first server 310 and the billing data processing process 420 of the second server 320 are service usage information stored in the first RFM 331 and the second RFM 333. A first RFM 331 for storing data as a file in the hard disk 312 of the first server 310 and the hard disk 322 of the second server 320, and constituting the charging data synchronization block 330; The second RFM 333 simultaneously stores information (or write state information) on the storage state of the service usage information data of the first server and the second server.

Meanwhile, the first server 310 may periodically transmit service usage information data every time selected by the database management server 360 using the first local network 340. In a preferred embodiment according to the present invention, the file name of the service usage information data stored in the hard disk 312 of the first server 310 and the hard disk 322 of the second server 320 is the current time to be stored. can do. In a preferred embodiment according to the present invention, the current time stored as a file name may include the current year, month, day, hour, minute, second.

In a preferred embodiment according to the present invention, the storage state information stored in the first RFM 331 and the second RFM 333 constituting the charging data synchronization block 330 is stored in each of the hard disks 312 and 322. The file name of the service usage information data to be used, the sequence ID of the service usage information data file stored in the hard disk, and the like. In a preferred embodiment according to the present invention, the predetermined time period for transmitting the service usage information data to the database management server 360 may be 5 minutes.

5A is a flowchart showing a first embodiment of a charging data synchronization method according to the present invention. Referring to FIG. 5A, the first server 310 provides a service to an active server, and the second server 320 monitors whether the first server has a system failure to the standby server (step S500). If a system failure occurs in the first server 310, the second server 320 recognizes the system failure of the first server 310 through the system monitoring unit 325 and switches to an active server to provide a service. (Step S501).

At this time, the first server 310 generates an alarm sound indicating a system failure, and the system operator attempts to recover the system failure of the first server 310. When the failure of the first server 310 is recovered, the first server 310 reads the billing data writing state information stored in the second RFM 333 and is missing the billing data in the local storage means 312 of the first server 310. The data is analyzed (step S502).

Subsequently, the second server 320 requests the second server 320 to transmit the missing service usage information data file to the local hard disk 312 of the first server 310 from the analyzed result (step S503). Subsequently, the first server 310 stores and synchronizes the received service usage information data on the hard disk 312 (step S504).

Fig. 5B is a diagram showing the system state of the first server and the second server and the data holding state of the local storage means according to the first embodiment of the present invention. 5B, the state 510 of the first server is in an active state and the state 540 of the second server is in a standby state during the T ₁ period 551. At this time, the first server and the second server both hold the same service usage information data.

If a system failure occurs in the first server at time A, the second server recognizes the system failure of the first server and becomes active and continues service. In the T ₂ section 552 where the first server state is a system failure state, service usage information data and storage are stored in the first RFM 331 of the synchronization block 330 and the hard disk 312 of the first server 310. Status information is not saved. However, the service usage information data and the storage state information are stored in the hard disk 322 and the second RFM 333 of the second server 320 that maintain the service.

Therefore, at the time point B when the system failure of the first server 310 is recovered, the first server 310 reads the storage state information of the service usage information data stored in the second RFM 333 to identify the missing data, and The second server 320 transmits missing data of the first server 310 stored in the hard disk 322 of the server 320. Subsequently, the missing data 535 received from the second server is stored 525 in the hard disk of the first server, and the contents of the first RFM are the same as the second RFM.

Therefore, even if the first server and the second server are switched to each other at the time point C, it is possible to prevent the omission of the charging data at the time point D of transmitting the service usage information data to the centralized charging center after the predetermined period T time 640. Can be. In a preferred embodiment of the present invention, the second server 320 periodically transmits data selected to the first server 310 by using the system monitoring means 325 and the transmitting means 332 of the charging data synchronization block 330. You can recognize the system failure by requesting

In a preferred embodiment according to the present invention, the selected data requesting the first server may be 1 bit data, which may be called a heart beat. In a preferred embodiment according to the present invention, the system monitoring period for requesting the first server may be for 2-3 seconds.

According to the present invention, the step of reading and analyzing the storage state information of the service usage information data stored in the second RFM 333 transmits and stores the storage state information stored in the second RFM 333 to the first RFM 331. By comparing the sequence IDs of the respective service usage information data files stored in the local storage means 312 and 322 of the first server 310 and the second server 320, the missing portions can be found. have.

6A is a flowchart illustrating a second embodiment of a data synchronization method according to the present invention. Referring to FIG. 6A, the first server 310 provides a service to the active server, and the second server 320 monitors whether the first server 310 has a system failure to the standby server (step S600). If a system failure occurs in the second server 320, the first server 310 continues to operate as an active server.

Subsequently, when the system failure problem of the second server 320 is resolved, the server plays the role of a standby server, and reads and analyzes the storage state information stored in the first RFM 331 of the transmission unit (step S601), thereby missing the service. The first server 310 is requested to transfer the usage information data file (step S602). Subsequently, the second server stores the received service usage information data on the hard disk (step S603).

6B is a diagram showing the system state and data retention state of the first server and the second server according to the second embodiment of the present invention. Referring to FIG. 6B, during the T ₁ period 651, the state 610 of the first server is in an active state, and the state 630 of the second server is in a standby state. At this time, if a system failure occurs in the second server waiting at the time A, the service usage information data is missing in the T ₂ section 652 until the time B when the system failure of the second server is resolved.

Therefore, at the point B at which the system failure of the second server is resolved, the second server 320 reads and analyzes the storage state information of the service usage information data stored in the first RFM 331 of the transmitter, and then analyzes the first server 310. The first server 310 transmits the data of the missing part of the second server 320 stored in the local hard disk 312 of the first server 310.

Subsequently, the data 545 of the missing part received from the first server 310 is received and stored in the hard disk 322 of the second server 320, and the contents of the second RFM 333 are stored in the first RFM. Do the same with Therefore, even if the server state is switched at the time point C between the first server 310 and the second server 320, the omission of the billing data is prevented at the time D when the service usage information data is transmitted after the predetermined period T time 640. can do.

In a preferred embodiment of the present invention, the step of reading and analyzing the storage state information of the service usage information data stored in the first RFM 331 may include a service usage information data file of the storage state information stored in the first RFM 331. The method may include reading a sequence ID and comparing the sequence ID of the service usage information data file among the stored state information stored in the second RFM 333 to find a missing portion.

In a preferred embodiment according to the present invention, the method for requesting the missing data to the first server 310 by the second server 320 may be performed by using the FTP means 332.

The foregoing has outlined rather broadly the features and technical advantages of the present invention to better understand the claims of the invention which will be described later. Additional features and advantages that make up the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted, and changed without departing from the spirit or scope of the invention described in the claims.

As described above, according to the present invention, the redundant server is provided with a reflective memory which is updated in real time, and the charging data is stored in the active state by storing the writing information of the data file of the charging data, each of which is stored in the local storage means of the server. In the recovery phase after a system failure occurs in the first server or the second server in the standby state, the write information of the charging data file stored in its reflective memory and the charging data stored in the reflective memory of the other server currently active By comparing the writing information of the files, it is possible to identify the missing charging data generated during the failure occurrence, and to update the synchronization data file stored in its local storage means by receiving the received charging method through the FTP method.

As a result, even in the event of a system failure of the active server or standby server, the charging data can be transmitted to the charging centralization center at all times without any missing data.

Claims (20)

In the multiplexing server system for providing a network service as a plurality of servers, the plurality of servers run the billing data processing process for the network service regardless of whether the active state or standby state, A reflective memory configured to store charging data for the network service provided by the multiplexing system and file information of the charging data; Local storage means for storing the charging data in accordance with file information of the charging data; Reflective memory data transmission means for connecting the reflective memories provided in each of the plurality of servers to each other to synchronize the contents stored in the plurality of reflective memories in the same manner in real time. Multiplexed server system, including. The multiplexing server system of claim 1, wherein the reflective memory is mounted in a PCI slot of the server. The multiplexing server system according to claim 1, wherein the reflective memory data transmission means has a data transmission / reception port and is connected to each other by an optical cable. The data transfer rate of the reflective memory data transfer means has a transfer rate faster than the rate generated by the billing data processing process and processed to store the billing data in a local storage means. Multiplexing server system. The multiplexing server system of claim 1, wherein the multiplexing server further comprises a communication network for monitoring a system failure of a server in an active state among the plurality of servers. 2. The multiplexing server system of claim 1, wherein the multiplexing server system comprises an automatic call distribution device. The multiplexing server system of claim 1, wherein the charging data includes service usage information generated in association with a service of the multiplexing server providing a network service. An automatic call distribution device, comprising: synchronizing charging data stored in a local storage means included in each of a plurality of multiplexed servers; Among the plurality of servers, the charging data generated as a result of providing a service by a first server operating as an active server is synchronized and stored in the local storage means of each of the plurality of servers, and stored in the reflective memory of each of the plurality of servers. Storing writing information of the charging data; When a failure occurs in the first server, a failure of the first server is detected through a communication channel for monitoring multiplexing, and the second server in standby takes over the service provided by the first server and generates a result of providing the service. Storing the charged data in local storage means of a second server, and storing write information of the charged data in a reflective memory of the second server; The first server recovered from a system failure reads write information of billing data stored in the local storage means of the first server from the reflective memory of the first server, and reads the write information of the charging data from the reflective memory of the second server. Read write information of the data stored in the local storage means of the memory device and compare the data with each other to recognize missing charging data due to the system failure, and the first server reflects the reflective memory of the first server and the ripple of the second server. Synchronizing the charging data stored in the local storage means of the first server by receiving the missing charging data from the second server through a communication channel connecting a selective memory; Data synchronization method of the multiplexing server comprising a. 9. The method of claim 8, wherein each of the plurality of servers stores charging data in a local storage means, and storing writing information of the charging data in the reflective memory, The billing data processing process running on the first server generates the billing data and writes the billing file to the local storage means of the first server at a predetermined time period, and billing the reflective memory of the first server. Writing a write time and a sequence number of the file; The billing data processing process running on a server in the standby state among the plurality of servers may reflect the first memory to its own reflective memory connected to the reflective memory of the first server through a communication channel. Writing the billing file to its local storage means using the billing data and the billing data write information written in synchronization with a memory; And The billing data processing process of the first server periodically transmits the billing file stored in the local storage means to a centralized billing center at predetermined time intervals. Data synchronization method of the multiplexing server comprising a. 10. The method of claim 9, wherein the first server in the active state and the server in the standby state write the billing file to its local storage means. Determining whether through reflective memory a data synchronization method of a multiplexing server. 10. The method of claim 9, wherein the failing first server synchronizes missing charging data. The charging data processing process of the first server may include: querying the reflective memory of the first server to determine whether the charging data is active or standby; The billing data processing process of the first server writes the writing time of its most recent billing data file recorded in the reflective memory of the first server and the billing data file of the second server recorded in the reflective memory of the second server. Comparing time; The process of the first server requesting a second server for missing charging data corresponding to the time difference of the write time; And The second server creating a billing file corresponding to the missing billing data and transmitting the billing file to the first server in a predetermined unit of time; Data synchronization method of the multiplexing server comprising a. A server redundancy method for synchronizing by receiving and updating missing data from a second server after a first server in an active state is down due to a system failure and recovers to a normal state, The first server and the second server store the service usage information data generated as a result of providing the service by the first server in an active state on a hard disk mounted in each server, and at the same time, reflect installed in each server. Storing the storage state information in the creative memory; Detecting, by the second server, a system failure of the first server through a communication channel for monitoring redundancy, receiving a service provided by the first server, and providing the service to a user; The first server solves a system failure problem, reads storage state information stored in the second reflective memory of the second server which provided the service, and stores the stored state information in the first reflective memory of the first server. Comparing the data stored in the hard disk of the first server with the data stored in the hard disk of the second server from the stored storage state information to recognize missing data; Requesting, by the first server, the missing data from the second server through a communication channel, receiving the missing data, and storing the missing data in a hard disk of the first server; Data synchronization method of the multiplexing server comprising a. The method of claim 12, wherein the storing of the service usage information data on the hard disks of the first server and the second server stores the current time to be stored as a file name. The method of claim 12, wherein the file name stored in the hard disk is stored in any one of, or a combination of, current year, month, day, hour, minute, and second. The method of claim 12, wherein the storing of the state information stored in the hard disks of the first server and the second server in the first reflective memory and the second reflective memory comprises: storing the hard disk of the first server. And storing both the state stored in the disk and the state stored in the hard disk of the second server in the first reflective memory and the second reflective memory, respectively. The method of claim 15, wherein the storing of the hard disk storage state information of each server in the first reflective memory and the second reflective memory comprises: a file name stored in a hard disk, and an order of storing the hard disk in a hard disk. Storing any one or a combination of a sequence number, a system state of each server, and a combination thereof. The method of claim 12, wherein the detecting of a system failure of the first server by the second server comprises: a communication network directly connecting the first server and the second server or the first reflective memory and the second reflector; A data synchronization method of a multiplexing server, characterized in that it is detected through a communication network connecting the memory. The method of claim 12, wherein the data synchronization method is The first server generating an alarm sound informing of a system failure; The system operator of the first server solving the failure problem of the first server system Data synchronization method of the multiplexing server further comprising. The method of claim 12, wherein the first server recognizes the missing data on the hard disk of the first server. Recognizing using any one or a combination of a file name, a sequence ID, the state of the server stored on the hard disk of each server stored in the first reflective memory Data synchronization method of the multiplexing server comprising a. The method of claim 12, wherein the first server requests the second server to transmit the missing data, and receives and stores the missing data using FTP.