CN108874593B - Disaster recovery method, device, equipment and system for two locations and three centers - Google Patents

Abstract

The present application discloses a two-site three-center disaster recovery system, including a production volume and a first snapshot volume located at a production site, a first disaster recovery volume located at a disaster recovery site in the same city, and a second disaster recovery volume located at a different disaster recovery site volume; the production volume has a first snapshot relationship with the first snapshot volume; the production volume has an active-active relationship established and started with the first disaster recovery volume, so that the first disaster recovery volume can be enabled when the production volume fails; the first snapshot volume is A synchronous remote replication relationship is established and started between the second disaster recovery volumes; the first snapshot relationship is started periodically, so that the second disaster recovery volume is enabled when both the production volume and the first disaster recovery volume fail. The present application can effectively improve the real-time synchronization of data, and improve the security and reliability of data disaster recovery. The present application also discloses a disaster recovery method, device, device and computer-readable storage medium for two locations and three centers, which also have the above beneficial effects.

Description

Disaster recovery method, device, equipment and system for two centers and three centers

technical field

The present application relates to the field of storage technologies, and in particular, to a method, apparatus, device, system, and computer-readable storage medium for disaster recovery in two places and three centers.

Background technique

In today's information age, data disaster recovery has become an inevitable choice for various IT systems.

Although the traditional active-standby disaster recovery solution and the same-city active-active data center solution can cope with most disasters, in the event of a regional disaster such as war, flood, earthquake, etc., the data centers in these two solutions may be destroyed at the same time. , causing business interruption. For example, the Wenchuan Earthquake in 2008 affected most of China and many countries and regions in Asia. In the hardest-hit areas, communications were completely interrupted, all IT systems were paralyzed, and the social and public service platform was completely stopped.

In order to cope with such regional disasters, the disaster recovery plan of two centers and three centers came into being. It adds a data center in a different place, so that business data is copied from the production center to the same-city disaster recovery center and the remote disaster recovery center to form multiple disaster recovery protection, so that the remote disaster recovery center is spared from regional disasters. However, the replication between the off-site disaster recovery center and the production center in the prior art is performed asynchronously, that is, the production center can perform data modification without receiving a response from the off-site data center, while the off-site synchronous replication needs to be performed every time in the production center. It is easy to increase the error rate due to frequent misoperations due to frequent start-up.

Therefore, it is a technical problem to be solved urgently by those skilled in the art to adopt what kind of disaster recovery technology in two places and three centers to further effectively improve the security and reliability of the disaster recovery solution.

SUMMARY OF THE INVENTION

The purpose of this application is to provide a disaster recovery method, apparatus, device, system and computer-readable storage medium for two locations and three centers, so as to further effectively improve the security and reliability of the disaster recovery solution.

In order to solve the above-mentioned technical problems, the present application provides a disaster recovery system with three centers in two places, including:

A production volume and a first snapshot volume located at the production site; a first snapshot relationship is established between the production volume and the first snapshot volume;

and a first disaster recovery volume located at a disaster recovery site in the same city; the production volume and the first disaster recovery volume are established and activated to have an active-active relationship; in order to enable the first disaster recovery volume when the production volume fails;

and a second disaster recovery volume located at a remote disaster recovery site; a synchronous remote replication relationship is established and activated between the first snapshot volume and the second disaster recovery volume; the first snapshot relationship When both the production volume and the first disaster recovery volume fail, the second disaster recovery volume is enabled.

Optionally, also include:

A second snapshot volume located at the remote disaster recovery site; a second snapshot relationship is established between the second disaster recovery volume and the second snapshot volume; a second snapshot relationship is established between the second snapshot volume and the second disaster recovery volume A third snapshot relationship; where,

The second snapshot relationship is periodically activated;

The third snapshot relationship is started when both the production volume and the first disaster recovery volume fail, and the synchronous remote replication between the first snapshot volume and the second disaster recovery volume fails, so that when the first snapshot volume and the second disaster recovery volume fail After the start of the third snapshot relationship is completed, the second disaster recovery volume is enabled.

Optionally, the second snapshot relationship is activated after the first snapshot relationship is periodically activated.

The present application also provides a disaster recovery method for two locations and three centers, which is applied to the above two locations and three centers disaster recovery system, including:

initiating the first snapshot relationship in response to a periodically input first activation instruction for the first snapshot relationship;

After detecting the failure of the production volume, determine whether the first disaster recovery volume is faulty;

If not, the prompt information for enabling the first disaster recovery volume is pushed to the user.

Optionally, after the judging whether the first disaster recovery volume is faulty, the method further includes:

If so, determine whether the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is faulty;

If the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is not faulty, the prompt information for enabling the second disaster recovery volume is pushed to the user.

Optionally, the three-center disaster recovery system in two places further includes:

A second snapshot volume located at the remote disaster recovery site; a second snapshot relationship is established between the second disaster recovery volume and the second snapshot volume; a second snapshot relationship is established between the second snapshot volume and the second disaster recovery volume The third snapshot relationship;

The disaster recovery method for three centers in two places further includes:

initiating the second snapshot relationship in response to periodically input second activation instructions for the second snapshot relationship;

After the judging whether the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is faulty, the method further includes:

If so, push the prompt information for starting the third snapshot relationship to the user; and start the third snapshot relationship in response to the inputted third start instruction for the third snapshot relationship;

After the start of the third snapshot relationship is completed, prompt information for enabling the second disaster recovery volume is pushed to the user.

Optionally, the starting the second snapshot relationship in response to a regularly input second start instruction for the second snapshot relationship includes:

The second snapshot relationship is initiated in response to the second initiation instruction entered after the periodic input of the first initiation instruction.

The present application also provides a disaster recovery device with three centers in two places, which is applied to the disaster recovery system with three centers in two places as above, including:

Response module: used to start the first snapshot relationship in response to a regularly input first start instruction for the first snapshot relationship;

Judging module: for judging whether the first disaster recovery volume is faulty after detecting the failure of the production volume;

Pushing module: configured to push the prompt information of enabling the first disaster recovery volume to the user after the judgment module determines that the first disaster recovery volume is not faulty.

The application also provides a disaster recovery device with three centers in two places, including:

Memory: used to store computer programs;

Processor: a step for executing the computer program to implement any of the above-mentioned methods for disaster recovery in two locations and three centers.

The present application also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, is used to implement any of the above-mentioned two-site, three-center content The steps of the disaster method.

The disaster recovery system in two places and three centers provided by this application includes: a production volume and a first snapshot volume located at a production site, a first disaster recovery volume located at a disaster recovery site in the same city, and a second disaster recovery volume located at a different disaster recovery site ; The production volume establishes a first snapshot relationship with the first snapshot volume; the production volume and the first disaster recovery volume establish and start a dual-active relationship, so as to enable the production volume when the production volume fails A first disaster recovery volume; a synchronous remote replication relationship is established and started between the first snapshot volume and the second disaster recovery volume; the first snapshot relationship is periodically started, so that between the production volume and the second disaster recovery volume The second disaster recovery volume is enabled when all the first disaster recovery volumes fail.

It can be seen that, compared with the prior art, the present application utilizes the first disaster recovery volume in the same-city disaster recovery site and the second disaster recovery volume in the different-site disaster recovery site, which can achieve double disaster recovery protection for the production volume. Since the second disaster recovery volume is in a synchronous replication relationship with the data in the production site, it can effectively improve the real-time synchronization of data, avoid repeated startup operations, effectively reduce the operation error rate, and improve the security of data disaster recovery. and reliability. The disaster recovery method, device, device and computer-readable storage medium in two places and three centers provided by the present application also have the above beneficial effects.

Description of drawings

In order to more clearly illustrate the prior art and the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings to be used in the description of the prior art and the embodiments of the present application. Of course, the following drawings related to the embodiments of the present application describe only a part of the embodiments of the present application. For those of ordinary skill in the art, without any creative effort, they can also obtain other embodiments according to the provided drawings. The accompanying drawings and other drawings obtained also belong to the protection scope of the present application.

1 is a schematic structural diagram of a disaster recovery system with three centers in two places provided by the application;

FIG. 2 is a schematic structural diagram of another two-place three-center disaster recovery system provided by this application;

FIG. 3 is a flowchart of a disaster recovery method for three centers in two places provided by the present application;

FIG. 4 is a flowchart of another method for disaster recovery in two places and three centers provided by the present application;

FIG. 5 is a structural block diagram of a disaster recovery device in two places and three centers provided by the present application.

Detailed ways

The core of the present application is to provide a disaster recovery method, apparatus, device, system and computer-readable storage medium in two places and three centers, so as to further effectively improve the security and reliability of the disaster recovery solution.

In order to describe the technical solutions in the embodiments of the present application more clearly and completely, the technical solutions in the embodiments of the present application will be introduced below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a disaster recovery system in two places and three centers provided by this application; including:

The production volume 11 and the first snapshot volume 12 located at the production site; the first snapshot relationship is established between the production volume 11 and the first snapshot volume 12;

And the first disaster recovery volume 21 located at the disaster recovery site in the same city; the production volume 11 and the first disaster recovery volume 21 are established and activated to have an active-active relationship; in order to enable the first disaster recovery volume 21 when the production volume 11 fails;

And the second disaster recovery volume 31 located at the remote disaster recovery site; a synchronous remote replication relationship is established and started between the first snapshot volume 12 and the second disaster recovery volume 31; the first snapshot relationship is regularly started, so that the production volume 11 When both the first disaster recovery volume and the first disaster recovery volume 21 fail, the second disaster recovery volume 31 is enabled.

Specifically, in the disaster recovery system of two places and three centers provided by this application, two disaster recovery sites are established, which are the same-city disaster recovery site located in the same region as the production site and the remote disaster recovery site that belongs to different regions from the production site. site. Among them, the first disaster recovery volume 21 of the same-city disaster recovery site and the production volume 11 are established and activated to have an active-active relationship, which can realize the same-city active-active disaster recovery solution. Since only one replication relationship (including the active-active relationship) can be performed on the same disk volume, the second disaster recovery volume 31 of the remote disaster recovery site can establish a replication relationship with the first snapshot volume 12 of the production volume 11, so that when necessary Time to achieve remote disaster recovery.

The first snapshot volume 12 is a copy of the production volume 11 obtained through the snapshot technology, and the snapshot technology to be used can be selected and implemented by those skilled in the art. It should be added that a snapshot is a snapshot copy of the data at a certain moment. Therefore, the time point of the snapshot, that is, the start time of the snapshot is very critical. After the snapshot relationship is established, the user can obtain the replica at the startup time by starting the snapshot relationship. In this application, the second DR volume 31 is obtained by duplicating the first snapshot volume 12. Therefore, in order to enable the second DR volume 31 to replace the production volume 11 when the production volume 11 fails, it is necessary to maintain the first snapshot volume 12. The snapshot volume 12 is updated so that the first snapshot volume 12 is as close to the production volume 11 at the latest moment as possible. Specifically, in the present application, the first snapshot relationship can be started periodically, that is, the first snapshot volume 12 of the production volume 11 can be updated regularly. As for the update period, those skilled in the art can specifically select and set it.

As described above, when the production site fails and the production volume 11 becomes unavailable, the first disaster recovery volume 21 located at the same-city disaster recovery site can be used at this time and be activated instead of the production volume 11 to maintain the normal operation of the business. If the same-city DR site also fails and the first DR volume 21 is also unavailable, the second DR volume 31 at the remote DR site can be activated to replace the production volume 11 to maintain normal business operations.

Different from the prior art, in the disaster recovery system of two locations and three centers provided by the present application, synchronous replication rather than asynchronous replication is specifically adopted between the second disaster recovery volume 31 and the first snapshot volume 12 . Compared with asynchronous replication, synchronous replication has stronger data synchronization. Every time the production volume 11 and its first snapshot volume 12 in the production site are modified, they need to obtain a response from the remote disaster recovery site before completing the data. Modified so that the second disaster recovery volume 31 of the remote disaster recovery site and the first snapshot volume 12 maintain instant data consistency, which greatly reduces the time for data differences between the second disaster recovery volume 31 and the first snapshot volume 12 part. In addition, after a synchronous replication relationship is successfully established, only one startup needs to be completed at the beginning of the system operation, while an asynchronous replication relationship needs to complete multiple asynchronous startups, and its frequent startup operations will undoubtedly lead to an increase in the error rate.

It can be seen that the disaster recovery system in two places and three centers provided by this application uses the first disaster recovery volume 21 in the disaster recovery site in the same city and the second disaster recovery volume 31 in the disaster recovery site in a different place, which can be used as a backup for the production volume 11. Double disaster recovery protection. Since the second disaster recovery volume 31 is in a synchronous replication relationship with the data in the production site, the real-time synchronization of the data can be effectively improved, and repeated startup operations can be avoided, effectively reducing the operation error rate, thereby improving the safety of data disaster recovery. sturdiness and reliability.

Please refer to FIG. 2, FIG. 2 is a schematic structural diagram of another two-site three-center disaster recovery system provided by this application;

The two-place three-center system provided by this application is based on the above-mentioned embodiment:

As a preferred embodiment, it also includes:

A second snapshot volume 32 located at a remote disaster recovery site; a second snapshot relationship is established between the second disaster recovery volume 31 and the second snapshot volume 32; a third snapshot relationship is established between the second snapshot volume 32 and the second disaster recovery volume 31; in,

The second snapshot relationship is started periodically;

The third snapshot relationship is started when both the production volume 11 and the first disaster recovery volume 21 fail, and the synchronous remote replication between the first snapshot volume 12 and the second disaster recovery volume 31 fails, so as to be enabled after the third snapshot relationship is started. The second disaster recovery volume 31.

Specifically, since the second disaster recovery site and the production site belong to two places, and there is a long communication line between the two, data replication cannot be performed normally due to problems with communication equipment in various places. In order to further improve the security of data disaster recovery, the disaster recovery system for two locations and three centers provided by the present application may also set a second snapshot volume 32 for the second disaster recovery volume 31 in the second disaster recovery site, so as to provide a second snapshot volume 32 for the second disaster recovery volume 31. The disaster volume 31 is backed up. When the synchronous replication between the second disaster recovery volume 31 and the first snapshot volume 12 fails, the second disaster recovery volume 31 can be restored according to the second snapshot volume 32, specifically, it is restored to the point where the second snapshot volume 32 was established. time, and then enable the second disaster recovery volume 31 to minimize data loss.

Therefore, a bidirectional snapshot relationship needs to be established between the second snapshot volume 32 and the second disaster recovery volume 31 here; the second snapshot relationship from the second disaster recovery volume 31 to the second snapshot volume 32 is the second snapshot relationship, and the second snapshot The relationship between the volume 32 and the second disaster recovery volume 31 is the third snapshot relationship. Of course, similar to the first snapshot relationship, the second snapshot relationship also needs to be started periodically.

As a preferred embodiment, the second snapshot relationship is activated after the first snapshot relationship is periodically activated. That is, the first snapshot volume 12 and the second snapshot volume 32 can be updated using the same timing cycle, and the second snapshot relationship is started immediately after the first snapshot relationship is started.

As for the third snapshot relationship, specifically when the second disaster recovery volume 31 needs to be enabled and there is a problem with the synchronous replication between the second disaster recovery volume 31 and the first snapshot volume 12, the startup can be performed, and the second disaster recovery volume 31 can be restored as The contents of the second snapshot volume 32 at this time.

Since the second snapshot relationship and the third snapshot relationship are established when the two-site three-center disaster recovery system is built, when the synchronous replication between the second disaster recovery volume 31 to be activated and the first snapshot volume 12 fails , the user does not need to establish the third snapshot relationship again, but can directly start the third snapshot relationship, which can greatly improve the data recovery efficiency and improve the reliability of data disaster recovery.

The following describes the disaster recovery method for two locations and three centers provided by the embodiments of the present application.

Please refer to FIG. 3. FIG. 3 is a flowchart of a disaster recovery method for two locations and three centers provided by the present application, which is applied to any of the above-mentioned disaster recovery systems for two locations and three centers, and mainly includes the following steps:

Step 1: Initiate the first snapshot relationship in response to the regularly input first activation instruction for the first snapshot relationship.

Step 2: After detecting the failure of the production volume 11, determine whether the first disaster recovery volume 21 is faulty; if not, go to Step 3.

Step 3: Push the prompt information of enabling the first disaster recovery volume 21 to the user.

Specifically, as mentioned above, the user needs to perform snapshot copying of the production volume 11 on a regular basis. When the system detects that the user has input the corresponding first activation instruction, the first snapshot relationship can be activated to complete a snapshot of the production volume 11. copy.

After detecting that the production volume 11 is faulty, the system can judge whether the first disaster recovery volume 21 is faulty. If the first disaster recovery volume 21 remains normal, the user may be notified to enable the first disaster recovery volume 21 that maintains an active-active relationship with the production volume 11 .

Of course, as mentioned above, the second disaster recovery volume 31 is another copy of the production volume 11, and is set in a remote disaster recovery center. Moreover, the second disaster recovery volume 31 and the first snapshot volume 12 are in a synchronous replication relationship, so as to enhance the timely synchronization between the second disaster recovery volume 31 and the production volume 11, reduce the number of startups, and improve reliability.

It can be seen that, in the disaster recovery method for two locations and three centers provided by the embodiments of the present application, the first disaster recovery volume 21 in the same-city disaster recovery site and the second disaster recovery volume 31 in the different-site disaster recovery site are used, which is sufficient for production Double disaster recovery protection for Volume 11. Since the second disaster recovery volume 31 is in a synchronous replication relationship with the data in the production site, the real-time synchronization of the data can be effectively improved, and repeated startup operations can be avoided, effectively reducing the operation error rate, thereby improving the safety of data disaster recovery. sturdiness and reliability.

Please refer to FIG. 4 , which is a flowchart of yet another method for disaster recovery in two places and three centers provided by the present application. The disaster recovery method for two locations and three centers provided by this application is based on the above-mentioned embodiment:

As a preferred embodiment, after judging whether the first disaster recovery volume 21 is faulty, the method further includes:

If yes, then enter step 4: determine whether the synchronous remote replication of the first snapshot volume 12 and the second disaster recovery volume 31 is faulty;

If the synchronous remote replication between the first snapshot volume 12 and the second disaster recovery volume 31 is not faulty, then proceed to step 5: push a prompt message for enabling the second disaster recovery volume 31 to the user.

Specifically, when the first disaster recovery volume 21 is enabled, the first disaster recovery volume 21 can usually be fault-diagnosed, so as to enable the second disaster recovery volume 31 when the first disaster recovery volume 21 also fails.

As a preferred embodiment, the disaster recovery system with three centers in two places further includes:

A second snapshot volume 32 located at a remote disaster recovery site; a second snapshot relationship is established between the second disaster recovery volume 31 and the second snapshot volume 32; a third snapshot relationship is established between the second snapshot volume 32 and the second disaster recovery volume 31;

The disaster recovery method of the two centers and three centers also includes:

Initiating the second snapshot relationship in response to periodically input second activation instructions for the second snapshot relationship;

After judging whether the synchronous remote replication of the first snapshot volume 12 and the second disaster recovery volume 31 is faulty, the method further includes:

If yes, then go to step 6: push the prompt information for starting the third snapshot relationship to the user; and go to step 7: start the third snapshot relationship in response to the inputted third start instruction for the third snapshot relationship; and go to step 8 : After the start of the third snapshot relationship is completed, a prompt message for enabling the second disaster recovery volume 31 is pushed to the user.

Specifically, as mentioned above, in order to cope with the problem of synchronous replication between the second disaster recovery volume 31 and the first snapshot volume 12, the second snapshot volume 32 can be set up at the remote disaster recovery site, and the second snapshot volume 31 can be set up at the remote disaster recovery site. A bidirectional snapshot relationship is established, and a second snapshot relationship is activated in response to a second activation command input periodically. Therefore, when the synchronous remote replication failure between the second disaster recovery volume 31 and the first snapshot volume 12 is detected, the user can be prompted to start the third snapshot relationship to restore the second disaster recovery volume 31 to a certain extent, so as to restore the second disaster recovery volume 31 to a certain extent. After the second disaster recovery volume 31 is restored, the second disaster recovery volume 31 is activated.

As a preferred embodiment, starting the second snapshot relationship in response to a second start instruction for the second snapshot relationship that is periodically input includes:

A second snapshot relationship is initiated in response to a second initiation instruction entered after the periodic input of the first initiation instruction.

Please refer to FIG. 5. FIG. 5 is a structural block diagram of a disaster recovery device with three centers in two places and three centers provided by the present application, which is applied to the disaster recovery system in two places and three centers as described above, and includes a response module 1, a judgment module 2, and a push button. Module 3:

The response module 1 is configured to start the first snapshot relationship in response to the regularly input first start instruction for the first snapshot relationship;

The judgment module 2 is used to judge whether the first disaster recovery volume 21 is faulty after detecting the failure of the production volume 11;

The push module 3 is configured to push the prompt information of enabling the first disaster recovery volume 21 to the user after the judgment module 2 determines that the first disaster recovery volume 21 is not faulty.

The application also provides a disaster recovery device with three centers in two places, including:

Memory: used to store computer programs;

Processor: a step for executing the computer program to implement any of the above-mentioned methods for disaster recovery in two locations and three centers.

The present application also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, it is used to implement the steps of any of the above-mentioned methods for disaster recovery in two locations and three centers .

The specific implementations of the disaster recovery method, device, device and computer-readable storage medium in two places and three centers provided by the present application and the two places and three centers disaster recovery system described above can be referred to each other correspondingly, and will not be repeated here.

The various embodiments in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other. For the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

It should also be noted that, in this application document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require Or imply that there is any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The technical solutions provided by the present application have been introduced in detail above. Specific examples are used herein to illustrate the principles and implementations of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims (9)

1. A disaster recovery system with three centers in two places, characterized in that, comprising: A production volume and a first snapshot volume located at the production site; a first snapshot relationship is established between the production volume and the first snapshot volume; and a first disaster recovery volume located at a disaster recovery site in the same city; the production volume and the first disaster recovery volume are established and activated to have an active-active relationship; in order to enable the first disaster recovery volume when the production volume fails; and a second disaster recovery volume located at a remote disaster recovery site; a synchronous remote replication relationship is established and activated between the first snapshot volume and the second disaster recovery volume; the first snapshot relationship When both the production volume and the first disaster recovery volume are faulty, the second disaster recovery volume is enabled; and a second snapshot volume located at the remote disaster recovery site; a second snapshot relationship is established between the second disaster recovery volume and the second snapshot volume; the second snapshot volume is established with the second disaster recovery volume There is a third snapshot relationship; where, The second snapshot relationship is periodically activated; The third snapshot relationship is started when both the production volume and the first disaster recovery volume fail, and the synchronous remote replication between the first snapshot volume and the second disaster recovery volume fails, so that when the first snapshot volume and the second disaster recovery volume fail After the start of the third snapshot relationship is completed, the second disaster recovery volume is enabled. 2 . The disaster recovery system of two places and three centers according to claim 1 , wherein the second snapshot relationship is activated after the first snapshot relationship is activated regularly. 3 . 3. A method for disaster recovery of three centers in two places, applied to the disaster recovery system of three centers in two places as claimed in claim 1, characterized in that, comprising: The first snapshot relationship is activated in response to a periodically inputted first activation instruction for the first snapshot relationship; the first snapshot relationship is activated in response to a periodically inputted second activation instruction for the second snapshot relationship Two snapshot relationships; After detecting the failure of the production volume, determine whether the first disaster recovery volume is faulty; If not, the prompt information for enabling the first disaster recovery volume is pushed to the user. 4. The disaster recovery method for two locations and three centers according to claim 3, characterized in that, after judging whether the first disaster recovery volume is faulty, the method further comprises: If so, determine whether the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is faulty; If the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is not faulty, the prompt information for enabling the second disaster recovery volume is pushed to the user. 5 . The disaster recovery method for two locations and three centers according to claim 4 , wherein after judging whether the synchronous remote replication of the first snapshot volume and the second disaster recovery volume is faulty, the method further comprises: 6 . If so, push the prompt information for starting the third snapshot relationship to the user; and start the third snapshot relationship in response to the inputted third start instruction for the third snapshot relationship; After the start of the third snapshot relationship is completed, prompt information for enabling the second disaster recovery volume is pushed to the user. 6 . The disaster recovery method for two locations and three centers according to claim 5 , wherein the starting the second snapshot relationship in response to a second startup instruction for the second snapshot relationship that is periodically input comprises the following steps: 6 . : The second snapshot relationship is initiated in response to the second initiation instruction entered after the periodic input of the first initiation instruction. 7. A disaster recovery device of two places and three centers, applied to the disaster recovery system of two places and three centers as claimed in claim 1, characterized in that, comprising: Response module: used to start the first snapshot relationship in response to a regularly input first start instruction for the first snapshot relationship; in response to a regularly input second start instruction for the second snapshot relationship and start the second snapshot relationship; Judging module: for judging whether the first disaster recovery volume is faulty after detecting the failure of the production volume; Pushing module: configured to push the prompt information of enabling the first disaster recovery volume to the user after the judgment module determines that the first disaster recovery volume is not faulty. 8. A disaster recovery device with three centers in two places, characterized in that, comprising: Memory: used to store computer programs; Processor: a step for executing the computer program to implement the method for disaster recovery in two places and three centers according to any one of claims 3 to 6. 9. A computer-readable storage medium, characterized in that, a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the computer program is used to realize any one of claims 3 to 6. The steps of the disaster recovery method of the three centers in two places.

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