JP2009003631A - Redundant configuration server system, synchronous processing method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve data synchronization between an active system server and a stand-by system server without imposing any labor on the active system server in a redundant configuration server system. <P>SOLUTION: In a redundant configuration server system equipped with an active system server 10 and a stand-by system server 20, the stand-by system server 20 is provided with a synchronization processing part 22 for performing file synchronization processing to periodically monitor a shared area in a storage device 13 of the mounted active system server 10, and to, when a shared file is written in the shared area in the storage device 13 of the active system server 10, detect the shared file of the shared area in the storage device 13 of the active system server 10, and to acquire the detected shared file, and to write the acquired shared file in a storage device 24 of the stand-by system server 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a redundant server system including an active server and a standby server, a synchronization processing method, and a program.

  In the server system, since it is required to continue the service even if a failure occurs in the server, conventionally, a redundant configuration including an active server and a standby server has been adopted. Such a redundantly configured server system makes it possible to continue the service by treating the standby server as a new active server when a failure occurs in the active server. In order to enable service continuation by system switching, it is necessary to synchronize the data held by the active server and the data held by the standby server.

  In the conventional redundant configuration server system, when synchronizing the data of the active server and the data of the standby server, a storage device such as a RAID device or a shared memory accessible from both servers is used. For each of these, dedicated hardware (such as a controller) for monitoring the storage device was used (see, for example, Patent Document 1).

  When data synchronization hardware is not used, data synchronization processing can be performed using data synchronization software (see, for example, Patent Document 2).

JP 2005-293315 A JP 2006-58960 A

  However, in the conventional redundant configuration server system that performs data synchronization processing by software, if the data synchronization processing is controlled on the active server side, in addition to performing the original service, the active server There is a risk that the load will increase, leading to a decrease in processing capacity. In addition, if the configuration is such that the data synchronization processing is controlled on the active server side, the scale of software development has become large for data transfer processing between servers.

  A main problem of the present invention is to perform data synchronization between an active server and a standby server without applying a load to the active server in a redundant server system.

  In a first aspect of the present invention, in a redundant configuration server system including an active server and a standby server, the standby server periodically monitors a shared area in the storage device of the mounted active server. And when the shared file is written in the shared area in the storage device of the active server, the shared file in the shared area in the storage device of the active server is detected, and the detected shared file is detected. And a file synchronization processing unit for performing a file synchronization process for writing the acquired shared file to the storage device of the standby server.

  In the redundant server system according to the present invention, it is preferable that the file synchronization processing unit issues a mount instruction for causing the operating system function unit of the standby server to execute the mount processing.

  In the redundant server system according to the present invention, it is preferable that the operating system function unit executes the mount process on the active server by receiving the mount instruction from the file synchronization processing unit.

  In the redundant server system according to the present invention, it is preferable that the operating system function unit executes the mount process using a network file system.

  In a second aspect of the present invention, in a file synchronization method for a redundantly configured server system comprising an active server and a standby server, a shared area in the storage device of the active server mounted in the standby server is defined. Periodically monitoring, and when the shared file is written to the shared area in the storage device of the active server, in the standby server, the sharing of the shared area in the storage device of the active server A step of detecting a file, and a step of performing a file synchronization process in the standby server for acquiring the detected shared file and writing the acquired shared file to a storage device of the standby server. It is characterized by.

  In the third aspect of the present invention, in the program used for the standby server of the redundant configuration server system including the active server and the standby server, the shared area in the storage device of the mounted active server is periodically Automatically monitoring, and when a shared file is written to a shared area in the storage device of the active server, detecting the shared file in the shared area in the storage device of the active server; And performing a file synchronization process of acquiring the detected shared file and writing the acquired shared file to a storage device of the standby server.

  According to the present invention, since it is not necessary to operate software for performing file synchronization on the active server side, file synchronization can be performed between the active server and the standby server without applying a load on the active server. Can do. Also, file synchronization processing can be performed by software without using dedicated hardware. In addition, by operating the file synchronization process on the standby server, the active server can perform only the service-related processing, and the load on the active server can be suppressed. In addition, since the mount process uses the network file system of the operating system function part and the file synchronization function is unaware of file transfer, a new file transfer process between the active server and the standby server is added. The software development scale can be reduced without any problems.

(Embodiment 1)
A redundant configuration server system according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing the configuration of a redundant server system according to Embodiment 1 of the present invention. FIG. 2 is a block diagram schematically showing the configuration of the redundant configuration server system according to the first embodiment of the present invention.

  Referring to FIG. 1, the redundant configuration server system 1 is a server system having a redundant redundant configuration with an active server 10 and a standby server 20.

  The active server 10 is an active server that provides a service through access from a terminal (not shown) in a normal state. The active server 10 has a computer function that operates based on a predetermined program. The active server 10 is communicably connected to the standby server 20 via the network 30, and synchronizes data necessary for redundancy with the standby server 20. The active server 10 includes an application function unit 11, an operating system function unit 12, and a storage device 13 as main components (see FIG. 2).

  The application function unit 11 is a function unit that executes a predetermined function based on an application program that provides a service through access from a terminal (not shown) in a normal state. The application function unit 11 writes a file that needs to be synchronized to provide a service (necessary for redundancy between servers) to the storage device 13.

  The operating system function unit 12 is a function unit that executes a predetermined function based on an operating system that manages the entire computer system of the active server 10. The operating system function unit 12 is configured so that the operating system function unit 23 of the standby server 20 performs a mounting process (the storage server 13 is recognized and operated by the standby server 20), thereby allowing the shared area in the storage device 13 to be shared. The standby server 20 can access the shared file.

  The storage device 13 is a storage device such as a shared file 40, a hard disk drive that stores information such as programs, and a memory.

  The standby server 20 is a standby server that waits so that the active system can be quickly switched when a failure occurs in the active server 10. The standby server 20 has a computer function that operates based on a predetermined program. The standby server 20 is communicably connected to the active server 10 via the network 30 and synchronizes data necessary for redundancy with the active server 10. The standby server 20 includes, as main components, an application function unit 21, a file synchronization processing unit 22, an operating system function unit 23, and a storage device 24 (see FIG. 2).

  The application function unit 21 is a function unit that executes a predetermined function based on an application program that stands by so that a transition to an operation state can be promptly made when a failure occurs in the active server 10. The application function unit 21 performs the same operation as the application function unit 11 of the active server 10 when a failure occurs in the active server 10.

  The file synchronization processing unit 22 is a processing unit that performs predetermined processing based on a program that performs processing related to file synchronization for the file in the storage device 24 and the shared file in the storage device 13. The file synchronization processing unit 22 issues a mount instruction to the operating system function unit 23 in order to mount the storage device 13 of the active server 10 as a file system of its own server. The file synchronization processing unit 22 periodically monitors the shared file in the shared area of the storage device 13 that has been mounted. The file synchronization processing unit 22 detects that a shared file has been written in the shared area of the storage device 13. The file synchronization processing unit 22 waits with the active server 10 for a file in the shared area in the storage device 13 of the active server 10 that is recognized as a file in the storage device 24 of the standby server 20 by the mount processing of the operating system function unit 23. A file synchronization process for acquiring the shared file in the shared area of the storage device 13 and writing the acquired shared file to the storage device 24 is performed without being aware of the network 30 between the system servers 20.

  The operating system function unit 23 is a function unit that executes a predetermined function based on an operating system that manages the entire computer system of the standby server 20. The operating system function unit 23 recognizes a file in the shared area in the storage device 13 of the active server 10 as a file in the storage device 24 of the standby server 20 by receiving a mount instruction from the file synchronization processing unit 22. Perform the mount process that enables it. The mount process is performed using the network file system (NFS) of the operating system function unit 23.

  The storage device 24 is a storage device such as a shared file 40, a hard disk drive that stores information such as programs, and a memory.

  The network 30 is an information communication network such as a bus LAN (Local Area Network) or a ring LAN.

  The shared file 40 is a file that needs to be synchronized in order to form a redundant configuration between the active server 10 and the standby server 20.

  Next, the operation of the redundantly configured server system according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a sequence chart schematically showing the operation of the redundantly configured server system according to the first embodiment of the present invention.

  First, the file synchronization processing unit 22 of the standby server 20 issues a mount instruction to the operating system function unit 23 in order to mount the storage device 13 of the active server 10 as a file system of its own server (step A1).

  Next, the operating system function unit 23 of the standby server 20 performs a mount process on the operating system function unit 12 of the active server 10 by receiving a mount instruction from the file synchronization processing unit 22 (step A2). . At this time, the operating system function unit 12 of the active server 10 enables the standby server 20 to access the shared file in the shared area in the storage device 13. As a result, the file in the shared area in the storage device 13 of the active server 10 is recognized as a file in the storage device 24 of the standby server 20 and can be operated. That is, the storage device 13 of the active server 10 is mounted as a file system of the standby server 20.

  After the mounting process of the storage device 13 of the active server 10, the file synchronization processing unit 22 of the standby server 20 performs file monitoring that periodically monitors the shared area in the storage device 13 by the file monitoring function (step A3).

  When the file synchronization processing unit 22 of the standby server 20 is monitoring a file, the application function unit 11 of the active server 10 can share files (new shared files, updated shares) required for redundancy between servers. A file writing process is performed to write a file (including a file) into the shared area of the storage device 13 (step A4). That is, the active server 10 performs a normal file writing process in which a file is written only to the storage device 13 of its own server.

  When the shared file is written in the shared area of the storage device 13, the file synchronization processing unit 22 of the standby server 20 detects that the shared file has been written in the shared area of the storage device 13 of the active server 10. A file detection process is performed (step A5).

  When it is detected that a shared file has been written in the shared area of the storage device 13 of the active server 10, the file synchronization processing unit 22 of the standby server 20 acquires and acquires the shared file of the shared area in the storage device 13. A file synchronization process for writing the shared file to the storage device 24 is performed (step A6). As a result, the contents of the files match between the active server 10 and the standby server 20, and the file can be shared between the active server 10 and the standby server 20 at the time of providing the service. Even in the case where a problem occurs, the service can be continued by treating the standby server 20 as a new active server.

  According to the first embodiment, the following effects can be obtained.

  File synchronization processing can be performed by software without using dedicated hardware.

  In addition, by executing the file synchronization process on the standby server 20, the active server 10 only needs to perform the process related to the service, so that the load on the active server 10 can be suppressed. That is, by performing the file synchronization process only with the standby server 20, it is not necessary for the active server 10 to be aware of the file synchronization process, and the load on the active server 10 can be suppressed.

  Further, since the mount process uses the network file system (NFS) of the operating system function unit 23 of the standby server 20, the file synchronization process is not aware of file transfer. There is no need to newly add a file transfer processing unit between the servers 20, and the development scale of software can be suppressed.

It is the block diagram which showed typically the structure of the redundant configuration server system which concerns on Embodiment 1 of this invention. It is the block diagram which showed typically the structure of the redundant configuration server system which concerns on Embodiment 1 of this invention. It is the sequence chart which showed typically operation | movement of the redundantly configured server system which concerns on Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Redundant configuration server system 10 Operation system server 11 Application function part 12 Operating system function part 13 Storage device 20 Standby system server 21 Application function part 22 File synchronous processing part 23 Operating system function part 24 Storage device 30 Network 40 Shared file

Claims (6)

In a redundant configuration server system comprising an active server and a standby server,
The standby server periodically monitors the shared area in the storage device of the active server that has been mounted, and when a shared file is written to the shared area in the storage device of the active server Detecting the shared file in the shared area in the storage device of the active server, acquiring the detected shared file, and performing file synchronization processing for writing the acquired shared file to the storage device of the standby server A redundant server system comprising a file synchronization processing unit.   The redundant server system according to claim 1, wherein the file synchronization processing unit issues a mount instruction for causing the operating system function unit of the standby server to execute the mount process.   3. The redundant configuration server system according to claim 2, wherein the operating system function unit executes the mount processing on the active server upon receiving the mount instruction from the file synchronization processing unit.   4. The redundant configuration server system according to claim 3, wherein the operating system function unit executes the mount process using a network file system. In a file synchronization method of a redundant configuration server system including an active server and a standby server,
In the standby server, periodically monitoring a shared area in the storage device of the operational server that has been mounted;
Detecting a shared file in the shared area in the storage device of the active server in the standby server when a shared file is written to a shared area in the storage device of the active server;
In the standby server, obtaining the detected shared file, and performing a file synchronization process for writing the acquired shared file to the storage device of the standby server;
A file synchronization method for a redundantly configured server system, comprising: In the program used for the standby server of the redundant configuration server system including the active server and the standby server,
Periodically monitoring a shared area in the storage device of the operational server that has been mounted;
Detecting the shared file in the shared area in the storage device of the active server when a shared file is written to the shared area in the storage device of the active server;
Performing the file synchronization process of acquiring the detected shared file and writing the acquired shared file to the storage device of the standby server;
A program characterized by having executed.

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