CN100413261C - Method and system for data recovery - Google Patents

Abstract

The present invention provides a method for data recovery, which is applied to a system including a hot backup module and at least one application module, comprising steps: the hot backup module sends a first detection message to each application module; each The application module receives the first detection message, and makes the internal information of the application module consistent according to the first detection message, and then sends a first response message to the hot backup module; the hot backup module receives the first After responding to the information, send a second detection message; each application module receives the second detection message, and makes the information between the application modules consistent according to the second detection message; meanwhile, the present invention also provides a data Recovered system. Using the method and system of the present invention ensures that the data within and between modules of each application module is consistent, improves the reliability of the communication system, and ensures the normal operation of communication services.

Description

Method and system for data recovery

technical field

The invention relates to recovery technology in the field of data communication, in particular to a data recovery method and system.

Background technique

The main board is the control center of the router, and the CPU and memory are on the main board. The main board is responsible for the management and control of the entire router, and the IP routing protocol runs on the main board. The main board directly receives the instructions from the network management center, and sends them to the interface boards to execute the instructions. At the same time, each interface board transmits the running status and statistical data to the main board, and the main board performs necessary processing and sends them to the main board when necessary. Network management center. The static route configured by the network administrator and the dynamic route generated by running the routing protocol are managed by the master board and delivered to each interface board, so that each interface board can independently forward data packets.

The role of the main board is very important. Once it fails, the entire router will not work properly. For the core network equipment of the telecommunication network, no matter any part of the system fails, it can always provide services in time when customers need it. It requires an availability rate of 99.999%, that is, the downtime of one year cannot exceed 5 minutes, increasing the availability of the system appears to be particularly important.

Redundancy is a key technology to increase system availability. A router provides high availability by being equipped with two route processor boards, one of which is the main route processor, called the active board, and is active; the other is the backup route processor, called the standby board, which is in the passive state.

When the standby board is inserted or the data on the main board is updated, the modules (software programs, routing protocols, etc.) running on the main board will back up the data to the standby board to ensure that the data on the main data remains consistent. In the normal working process, the master and slave boards exchange handshake signals periodically. If the master board fails due to hardware or software errors and the slave board cannot receive the handshake signal from the master board, the switchover process will be started and the slave board will take over. The main board works and becomes the main board, and the original main board becomes the standby board to ensure the normal operation of the router.

The composition of the main and standby boards is shown in Figure 1:

Application module 1, application module 2, and application module 3 in the main board: provide data that needs to be backed up to the application module of the backup board;

Application module 1, application module 2, and application module 3 in the standby board: receive the backup data in the main board and store it in the corresponding application module of the standby board;

Hot backup module: A module that coordinates data backup from the active board to the standby board, and switches the standby board to the active state when the active board fails.

The main and standby boards fail during the backup process, and the backup data in the new main board is incomplete, resulting in inconsistent data in the standby board, that is, the running data backed up inside the application module is inconsistent with the data that needs to be used during normal operation;

If the new main board is running in the current state, resulting in inconsistent internal data in some application modules;

For application modules that have dependencies at the same time, due to the inconsistency of the data of the dependent modules, the data associated between the application modules is inconsistent.

For example, when the interface management module and the routing module (application module) on the standby board are running normally, the interface management module obtains the relevant information of the routing module. When there is a problem with the data, the data on the routing module is inconsistent with the data required for normal operation, so the data obtained on the interface management module is incorrect, that is, inconsistent with the data required for normal operation.

As a result, the entire system cannot resume normal operation.

Contents of the invention

The purpose of the present invention is to provide a method and system for data recovery, to avoid when the main board fails, when the backup board is switched to a new main board, to ensure the internal and inter-application data of each application module of the backup board. Consistent, improve the reliability of the communication system.

A method for data recovery, which is applied to a system including a hot backup module and at least one application module, comprising steps:

The hot backup module sends a first detection message to each application module;

Each application module receives the first detection message, and makes the internal information of the application module consistent according to the first detection message, and then sends a first response message to the hot backup module;

After the hot backup module receives the first response information, it sends a second detection message;

Each application module receives the second detection message, and makes the information among the application modules consistent according to the second detection message.

The first detection message sent by the hot backup module is specifically:

The hot backup module obtains the priority of the application modules, and sends the first detection message to each of the application modules according to the order of priority of the application modules from high to low.

Making the internal information of the application module consistent according to the first detection message specifically includes: performing internal information consistency detection to perform consistency detection on data with dependencies inside the application module, and modifying inconsistent information.

The modifying the inconsistent information specifically includes: restoring the inconsistent data with dependencies to a default safe value or initializing it to zero.

The sending of the second detection message is specifically:

The hot backup module sequentially sends the second detection message to each application module according to the priority of the application module.

The making the information consistent between the application modules according to the second detection message specifically includes: detecting the data with dependencies between the application modules, and modifying the inconsistent information between the application modules.

The modification of the inconsistent information between the application modules is specifically:

After the dependent application module of the application module completes internal consistency modification, a data synchronization operation between the dependent application module and the dependent application module is performed.

After making the information between the application modules consistent according to the second detection message, it also includes:

The application module sends second response information to the hot backup module.

A data recovery system, comprising: a hot backup module, at least one application module connected to the hot backup module,

The hot backup module further includes a message transceiving unit: used to send the first and second detection messages to each application module, and receive the response information of each application module;

Each application module: receiving the first and second detection messages; performing internal information consistency detection, and making the internal information of each application module consistent, sending the first response information to the hot backup module; executing the application module Inter-consistency detection, and make the information between each of the application modules consistent.

Each of the application modules includes:

Module internal detection unit: receiving the first detection message, performing consistency detection on the data with dependencies inside the application module, and restoring the data with dependencies to default security values or initializing them to zero;

An inter-module detection unit: receiving the second detection message, and performing a consistency detection on the data having a dependency relationship between the application modules, so as to make the data between the application modules consistent.

Each of the application modules also includes:

Registration unit: register the priority of each application module with the hot backup module.

The messaging unit includes:

A message order sending unit: acquire the priority of each application module, and send the first or second detection message to each application module in order of priority from high to low.

The application modules also include:

Response unit: sending the first and second response messages to the hot backup inter-module detection module.

In the present invention, the consistency of data within and among modules of each application module is guaranteed, the reliability of the communication system is improved, and the normal operation of communication services is ensured.

Description of drawings

Fig. 1 shows the composition of main and standby boards in the prior art.

Fig. 2 is a flow chart of the method of the embodiment of the present invention.

Fig. 3 is a structural diagram of the system of the embodiment of the present invention.

Fig. 4 is a structural diagram of an application module in an embodiment of the present invention.

Fig. 5 is a structural diagram of the hot backup module in the embodiment of the present invention.

Fig. 6 is a specific implementation process in the embodiment of the present invention.

Detailed ways

The present invention provides a method and system for data recovery. The main board and the standby board are set on the hardware. Both the main board and the standby board include: a plurality of application modules and a hot backup module. When the board is switched, the standby board is upgraded to the main board, and the hot backup module of the new main board sends a detection message to notify each application module to perform data consistency detection within the application module and between application modules, and to modify the internal and external data of each application module. Inconsistent information between modules.

Describe the present invention in detail below in conjunction with accompanying drawing, the concrete steps of method among the present invention are as shown in Figure 2, comprise steps:

Step 201: The hot backup module sends a first detection message.

Each application module registers its priority with the hot backup module, and sends a first detection message to the application module in descending order of the priority of each application module.

The priority of each application module is preset according to the data dependency of the application module. For example, in the data transmission operation, the data of application module 1 is obtained from application module 2, and the priority of application module 1 is lower than that of application module 2 priority.

Step 202: Each application module detects the consistency of the internal information of the module, and modifies the inconsistent information within each application module.

Internal data inconsistency means that when data is backed up, the internal processing unit of the application module has a dependency relationship due to a failure, resulting in internal data inconsistency; for example, the first data processing unit in the application module needs to use the second data processing unit to process the output data. Thus, the first data processing unit is dependent on the second data processing unit; when the second data processing unit fails, the first data processing unit does not operate normally, resulting in inconsistent data within the application module.

Each application module receives the first detection message, and according to the order in which the application modules receive the first detection message, sequentially checks the consistency of the data with dependencies inside the application module, and restores the inconsistent data with dependencies inside the module to the default Safe value or initialized to zero.

The default safe value is the safe value stored in the previous implementation of a full hot backup before the failure occurred.

Step 203, each application module sends a response message to the hot backup module.

Each application module sends a response message to notify the hot backup module to complete the inconsistent data modification inside the module.

Step 204, the hot backup module sends the second detection information.

The hot backup module sequentially sends the second detection message to each application module according to the priority registered by the application module.

Step 205, each application module detects inter-module information, and modifies inconsistent information between application modules.

For application modules with data dependencies, the first application module must wait for the dependent second application module to complete the internal consistency modification, and then execute the data synchronization operation between the first application module and the second application module to reach the first application module. Consistency with the second application module data.

After performing the above steps also include:

The application module sends a response message to the hot backup module, notifying the hot backup module to complete the consistent recovery of data between modules.

A system for data recovery, as shown in Figure 3, includes: a hot backup module, at least one application module connected to the hot backup module:

The hot backup module further includes a message transceiving unit: used to send the first and second detection messages to each application module, and receive the response information of each application module;

Each application module: receiving the first and second detection messages; performing internal information consistency detection, and making the internal information of each application module consistent, sending the first response information to the hot backup module; executing the application module Inter-consistency detection, and make the information between each of the application modules consistent.

Described application module is as shown in Figure 4, comprises:

Module internal detection unit: receives the first detection message, performs consistency detection on the data with dependencies inside the application module, and restores the data with dependencies to default security values or initializes them to zero;

The inter-module detection unit: receives the second detection message, and performs consistency detection on the data with dependencies between the application modules, so that the data between the application modules are consistent;

Registration unit: register the priority of each application module with the hot backup module. Response unit: sending the first and second response messages to the hot backup module.

The hot backup module is as shown in Figure 5, including:

Message sequence sending unit: acquire the priority of each application module, and send the first or second detection message to each application module in descending order of priority.

Response information receiving unit: receiving the first and second response information sent by the application module.

A data recovery method, the modules included in the specific implementation process are shown in Figure 6: three application modules: application module 1, application module 2, application module 3; a hot backup module.

Application module 3 transmits data to application module 2, and application module 2 transmits data to application module 1. Application module 1 depends on application module 2, and application module 2 depends on application module 3. Therefore, application module 3 has the highest priority. 2 has the second priority, and application module 3 has the lowest priority.

The specific steps are as follows:

Step 701, the hot backup module sends an in-module detection message to the three application modules.

The hot backup module acquires the priorities of the three application modules, firstly sends an in-module detection message to application module 3, then sends a module detection message to application module 2, and finally sends an in-module detection message to application module 1.

702. The application module 1, the application module 2, and the application module 3 detect information in the modules, and modify inconsistent information.

Application module 1, application module 2, and application module 3 check the consistency within the modules in sequence according to the sequence of received detection information in the modules. If the internal information of the application modules is inconsistent, initialize the internal data of the application module to zero or restore it to the set value. safe value.

Step 703, the application module 1, the application module 2 and the application module 3 respectively send response information to the application modules.

Step 704 , after receiving the response information from application module 1 , application module 2 and application module 3 , the hot backup module sends inter-module detection messages to application module 3 , application module 2 and application module 2 in sequence according to priority.

Step 705 , the application modules perform consistency detection among application modules according to their dependencies, and modify inconsistency information among the modules.

The application module 3 receives the inter-module detection message, detects that the application module 3 has no dependency relationship, and completes the inter-module detection of the module 3 .

The application module 2 receives the inter-module detection message, detects that the data of the application module 2 depends on the data of the application module 3, and the application module 2 performs data synchronization according to the data of the application module 3, so as to realize the data consistency of the application module 2.

Application module 1 receives the inter-module detection message and detects that the data of application module 1 depends on the data of application module 2, and application module 1 performs data synchronization according to the data of application module 2 to achieve data consistency of application module 1.

Through the above steps, the consistent process of the data between the modules and within the modules of the three application modules is completed.

The effect of the present invention is: when the master board crashes or resets, etc., the backup board is upgraded to a new master board, and at this time, it is ensured that the data in and between modules of each application module of the backup board are consistent, ensuring The data in the communication system is consistent, and the normal operation of the communication business is guaranteed, and the reliability of the communication system is improved.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (13)

1. A method for data recovery, the method is applied to a system that includes a hot backup module and at least one application module, it is characterized in that, comprising steps: The hot backup module sends a first detection message to each application module; Each application module receives the first detection message, and makes the internal information of the application module consistent according to the first detection message, and then sends a first response message to the hot backup module; After the hot backup module receives the first response information, it sends a second detection message; Each application module receives the second detection message, and makes the information among the application modules consistent according to the second detection message. 2. The method according to claim 1, wherein the first detection message sent by the hot backup module is specifically: The hot backup module obtains the priority of the application modules, and sends the first detection message to each of the application modules according to the order of priority of the application modules from high to low. 3. The method according to claim 1, characterized in that, making the information inside the application module consistent according to the first detection message is specifically: performing internal information consistency detection is to perform the data that has a dependency relationship inside the application module Consistency detection, and modify inconsistent information. 4. The method according to claim 3, wherein the modifying the inconsistent information specifically includes: restoring the inconsistent data with dependencies to a default safe value or initializing it to zero. 5. The method according to claim 1, wherein the sending of the second detection message is specifically: The hot backup module sequentially sends the second detection message to each application module according to the priority of the application module. 6. The method according to claim 1, wherein said making the information consistent between the application modules according to the second detection message is specifically: detecting the data with dependencies between the application modules, And modify the inconsistent information among the application modules. 7. The method according to claim 6, wherein the modifying the inconsistent information between the application modules is specifically: After the application module that the application module depends on completes internal consistency modification, the data synchronization operation between the application module and the application module it depends on is performed. 8. The method according to claim 1, characterized in that, after making the information between the application modules consistent according to the second detection message, it also includes: The application module sends second response information to the hot backup module. 9. A system for data recovery, comprising: a hot backup module, at least one application module connected to the hot backup module, characterized in that, The hot backup module further includes a message sending and receiving unit: used to send the first and second detection messages to each of the application modules, and receive the response information of each of the application modules; Each application module: receiving the first and second detection messages; performing internal information consistency detection, and making the internal information of each application module consistent, sending the first response information to the hot backup module; executing the application module Inter-consistency detection, and make the information between each of the application modules consistent. 10. The system according to claim 9, wherein each application module comprises: Module internal detection unit: receiving the first detection message, performing consistency detection on the data with dependencies inside the application module, and restoring the data with dependencies to default security values or initializing them to zero; An inter-module detection unit: receiving the second detection message, and performing a consistency detection on the data having a dependency relationship between the application modules, so as to make the data between the application modules consistent. 11. system according to claim 9, is characterized in that, described application module also comprises: Registration unit: register the priority of the application module with the hot backup module. 12. The system according to claim 11, wherein the messaging unit comprises: A message order sending unit: acquire the priority of each application module, and send the first or second detection message to each application module in order of priority from high to low. 13. The system according to claim 9, wherein the application module further comprises: Response unit: sending the first and second response messages to the hot backup module.

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