CN114442941B - Data migration method, system, storage medium and equipment - Google Patents

Abstract

The application provides a data migration method, a system, a storage medium and a device, wherein after a first storage device determines that data of a third LUN changes on other storage devices, a data change bitmap of the first storage device is synchronized to data synchronization services of the first LUN to the third LUN, and data increment of the first LUN is synchronized to the third LUN, so that a data change identifier and the data change bitmap are updated; the second storage device senses the data change of the third LUN through the data change identification and the data change bitmap of the third LUN, synchronizes the data change bitmap of the third LUN to the data synchronization service from the third LUN to the second LUN, synchronizes the data increment of the third LUN to the second LUN, and updates the data change identification and the data change bitmap of the third LUN when the third LUN processes the write command, so that the data change of the third LUN is sensed when the third LUN is imported into other storage devices, the operation complexity in the migration process is reduced, the migration time is shortened, and the migration efficiency is improved.

Description

A data migration method, system, storage medium and device

technical field

The present application relates to the technical field of data storage, and in particular to a data migration method, system, storage medium and equipment.

Background technique

With the advent of the big data era, the amount of data is getting larger and more important, and data migration and backup across devices has become a common requirement. In the usual implementation scheme, data is frequently migrated between data center S1 and data center S2 through the network. However, due to security factors and other reasons, if the network between data center S1 and data center S2 is disconnected, it cannot be borrowed. Existing data synchronization services (such as replication, mirroring, copying, etc.) complete data migration. Based on this, how to frequently migrate data across devices when network communication is unreachable has become an important research content.

At present, an alternative proposed is to use the disk as a USB flash drive. Assume that the data in LUN1 (Logical Unit Number, Logical Unit Number) of data center S1 needs to be migrated to LUN2 of data center S2. The specific implementation is: in the data center S1 creates LUN3 and configures the data synchronization service to synchronize all the data in LUN1 to LUN3. After the data synchronization is completed, it is necessary to disable related services and export LUN3. When importing LUN3 to data center S2, you need to configure the data synchronization service, and after synchronizing all the data in LUN3 to LUN2, you need to disable related services and export LUN3. After LUN3 is imported to data center S1, the above steps of configuring the data synchronization service will still be performed during the next data migration, and full synchronization will be performed. It can be seen that no matter whether the data of LUN1 is synchronized to LUN3 in data center S1 or the data of LUN3 is synchronized to LUN2 in data center S2, it is necessary to configure duplicate configuration and disable data synchronization in data center S1 and data center S2 business, and both data center S1 and data center S2 perform full synchronization to synchronize all data, which makes the migration process cumbersome, takes a long time, and reduces migration efficiency.

Contents of the invention

The present application provides a data migration method, system, storage medium and equipment, so as to improve the efficiency of data migration.

The technical solutions provided by this application include:

In the first aspect, the embodiment of the present application provides a data migration method, the method comprising:

When the first storage device imports a third LUN belonging to other storage devices to the first storage device, it is determined that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices Afterwards, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN, and the data synchronization service of the third LUN is initialized. the data change bitmap of the third LUN, and change the change data identifier of the third LUN to the first identifier value; according to the configured data synchronization service from the first LUN to the third LUN, change the synchronizing the data increment of the first LUN to the third LUN, changing the data change flag of the third LUN to a second flag value, and updating the data change bitmap of the third LUN; the first The LUN is designated for producing data volumes, the third LUN is designated for moving data volumes, the first identification value is used to indicate that data has not changed, and the second identification value is used to indicate that data has changed, so The above data change bitmap is used to record data changes;

When the second storage device imports the third LUN belonging to the other storage device to the second storage device, it is determined that the third LUN has a data synchronization service belonging to the second storage device and belongs to other storage devices After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization of the third LUN to the second LUN service, and according to the configured data synchronization service from the third LUN to the second LUN, change the data change identification of the third LUN to the first identification value, and initialize the data change bitmap of the third LUN ; When the third LUN is processing the write command, change the data change flag of the third LUN to the second identification value, and update the data change bitmap; the data increment of the third LUN is synchronized to the second LUN; The second LUN is designated to store the data copy of the production data volume.

In the second aspect, the embodiment of the present application provides a data migration system, the system includes at least a first storage device and a second storage device;

The first storage device is configured to, when importing a third LUN belonging to other storage devices to the first storage device, determine that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices. After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN , initialize the data change bitmap of the third LUN, and change the change data flag of the third LUN to a first flag value; according to the configured data synchronization from the first LUN to the third LUN Business, synchronizing the data increment of the first LUN to the third LUN, changing the data change identifier of the third LUN to a second identifier value, and updating the data change bitmap of the third LUN; The first LUN is designated for producing data volumes, the third LUN is designated for moving data volumes, the first identification value is used to indicate that data has not changed, and the second identification value is used to indicate that data has change, the data change bitmap is used to record data changes;

The second storage device is configured to, when importing the third LUN belonging to the other storage device to the second storage device, determine that the third LUN has a data synchronization service belonging to the second storage device and a After the data synchronization service of other storage devices, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized from the third LUN to the second LUN data synchronization service, change the data change flag of the third LUN to the first flag value, and initialize the data change bitmap of the third LUN; when the third LUN processes a write command, change the data of the third LUN The change flag is the second flag value, and the data change bitmap is updated; according to the configured data synchronization service from the third LUN to the second LUN, the incremental data of the third LUN is synchronized to the second LUN. In the LUN; the second LUN is designated to store the data copy of the production data volume.

It can be seen from the above technical solutions that in this application, the first storage device determines whether the data of the third LUN has changed through the data change identifier of the third LUN, that is, whether the third LUN has data written on other storage devices , and for the data change flag indicating that the data has changed, synchronize the data change bitmap of the third LUN to the data synchronization service from the first LUN to the third LUN, so that the first storage device can perceive that the third LUN is in other storage devices and change the data change flag of the third LUN to the first flag value, initialize the data change bitmap of the third LUN, and increase the data of the first LUN according to the configured data synchronization service The data is synchronized to the third LUN, and the data change ID and data change bitmap of the third LUN are updated; the second storage device perceives the data of the third LUN on other storage devices through the data change ID and data change bitmap of the third LUN Change, and synchronize the data change bitmap of the third LUN to the data synchronization service from the third LUN to the second LUN, change the data change identification of the third LUN to the first identification value, and initialize the data of the third LUN changing the bitmap, changing the data change flag of the third LUN to the second flag value when the third LUN is processing the write command, and updating the data change bitmap so that the third LUN is perceived when the third LUN is imported into other storage devices Data changes, and according to the configured data synchronization service, the data increment of the third LUN is synchronized to the second LUN. In this way, during the process of data migration, there is no need to repeatedly configure and disable the data synchronization service on the first storage device and the second storage device, and data incremental synchronization can be performed according to the data change bitmap and the data change identification. Applying the migration method provided by the embodiment of the present application can reduce the operation complexity in the migration process, shorten the migration time, and improve the migration efficiency.

Description of drawings

Fig. 1 is a flow chart of a data migration method provided by the present application;

FIG. 2 is a flow chart of implementing step 101 provided by the present application;

FIG. 3 is a flow chart of implementing step 102 provided by the present application;

FIG. 4 is a schematic structural diagram of a data migration system provided by the present application;

FIG. 5 is a schematic structural diagram of an electronic device provided by the present application.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also be called second information, and similarly, second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "at" or "when" or "in response to a determination."

Referring to Fig. 1, Fig. 1 is a flowchart of a data migration method provided by the present application, which method includes:

Step 101, when the first storage device imports a third LUN belonging to other storage devices to the first storage device, determine that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices. After the data synchronization service of the device, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data from the first LUN to the third LUN Synchronize the service, initialize the data change bitmap of the third LUN, and change the change data identifier of the third LUN to the first identifier value; according to the configuration of the first LUN to the third LUN Data synchronization service, synchronizing incremental data of the first LUN to the third LUN, changing the data change flag of the third LUN to a second flag value, and updating the data change bitmap of the third LUN .

The first LUN and the third LUN are located on different disks of the first storage device, that is to say, the disk storing the first LUN does not store the third LUN, and the disk storing the third LUN does not store the first LUN.

The first storage device is only named for the convenience of distinguishing it from the following devices, and is not used to limit a certain storage device.

The first storage device is used to configure a data synchronization service of the LUN, and the service may include a copy service, a mirror service, or a copy service.

LUN refers to the independent and available storage space created based on RAID (Redundant Arrays of Independent Disks, disk array), and is usually used to write the data of the front-end application server. In the embodiment of the present invention, the first LUN and the third LUN are not Specifically refers to two fixed LUNs, but may refer to any two LUNs used to store data, which will not be repeated in the following embodiments of the present invention.

In this embodiment, the first LUN is created in the first storage device and is designated for producing data volumes. When the third LUN is initially used for moving data volumes, it can be created in the first storage device and designated as Used to move data volumes.

In this embodiment, the first identification value and the second identification value do not specifically refer to certain two fixed identification values, but may refer to any two identification values on the LUN, which will not be repeated in the following embodiments of the present invention.

The first identification value is just a naming for the convenience of distinguishing it from the following identification values, and is not used to limit a certain device.

In this embodiment, a data change flag can be set on each LUN. The data change flag can include an initial flag value, a first flag value, and a second flag value. The initial flag value indicates that the flag is invalid, and there is no need to pay attention to the flag and data changes. In this case, "0" can be used for identification, the first identification value is used to indicate that the data has not changed, and "1" can be used for identification, and the second identification value is used to indicate that data has changed, and "2" can be used for identification.

The data change bitmap is used to record the data changes of the LUN. The storage space of the LUN is divided into multiple storage blocks according to the preset size. Each storage block corresponds to a bit in the data change bitmap. Based on this, if a bit value is 0, it means the storage block corresponding to the bit value The data of has not changed. If the bit value is 1, it means that the data of the storage block corresponding to the bit value has changed.

Exemplary:

When the first LUN and the third LUN are created on the first storage device, the data change flags of the first LUN and the third LUN are set to initial flag values. If the initial flag value is 0, no data change bitmap is created.

When the second LUN is created on the second storage device, the data change flag of the second LUN is set to an initial flag value, such as an initial flag value of 0, and no data change bitmap is created.

In this embodiment, when processing a write command for each LUN, if the data change flag of the LUN is the initial flag value, there is no special processing; otherwise, if the data change flag of the LUN is the first flag value, modify The data change is identified as the second identification value, and the value of the bit corresponding to the storage block corresponding to the write command in the data change bitmap is changed to 1; if the data change identification of the LUN is the second identification value, the data change bitmap is changed The value of the bit corresponding to the storage block corresponding to the write command is 1.

In this embodiment, the data synchronization service from the first LUN to the third LUN has been configured in the first storage device, and the initial data synchronization has been completed. During the initial synchronization process, since the data change identifier of the third LUN is an initial identifier value, there is no need to update the data change identifier and the data change bitmap of the third LUN.

When the first storage device imports the third LUN, that is, the third LUN has been imported to other storage devices and then returns to the first storage device, the data change status can be detected according to the data change identifier and data change bitmap of the third LUN. If the data change flag is the second flag value, then the data change situation of the third LUN can be obtained through the data change bitmap. In this step, the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN, so that the first LUN can perceive this part of the difference. Taking the copy service as an example, the first LUN is the source of the copy service LUN, the data change on the first LUN is recorded through the difference bitmap. When the data change bitmap of the third LUN is synchronized to the replication service from the first LUN to the third LUN, the data change bit of the third LUN will be The map is merged into the differential bitmap of the first LUN, so that the merged differential bitmap of the first LUN includes the data change bitmap of the third LUN.

Because the third LUN also has data synchronization services belonging to other storage devices, that is, other storage devices care about the data changes of the third LUN on the first storage device, therefore, after synchronizing the data change bitmap of the third LUN to the first After the data synchronization service from the LUN to the third LUN, it is also necessary to initialize the data change bitmap of the third LUN, and change the data change flag of the third LUN to the first flag value, so that the data change flag and data change of the third LUN can be passed The bitmap is used to mark the data changes of the third LUN on the first storage device.

When the first storage device synchronizes the incremental data of the first LUN to the third LUN based on the configured data synchronization service from the first LUN to the third LUN, on the one hand, taking the replication service as an example, when starting the first LUN When copying tasks to the third LUN, the difference data can be synchronized from the first LUN to the third LUN according to the difference bitmap of the merged first LUN, realizing incremental synchronization; on the other hand, the third LUN is processing When writing the command, modify the data change flag of the third LUN to the second flag value, and update the data change bitmap according to the write command until the third LUN is exported. The third LUN records the data change of the third LUN on the first storage device through the data change identifier and data change bitmap, so that when the third LUN is reimported to other storage devices, services on other storage devices can perceive the data change of the third LUN. Data changes of the three LUNs on the first storage device.

As an embodiment, after the first storage device determines that the third LUN has data synchronization services belonging to the first storage device and data synchronization services belonging to other storage devices, if it detects that the data change flag of the third LUN is the first One identifier value, according to the configured data synchronization service from the first LUN to the third LUN, and the difference of the data synchronization service recorded by the first LUN, the incremental data of the first LUN is synchronized to the third LUN , changing the data change flag of the third LUN to the second flag value, and updating the data change bitmap of the third LUN.

As another embodiment, after the first storage device determines that the third LUN has data synchronization services belonging to the first storage device and data synchronization services belonging to other storage devices, if it detects that the data change flag of the third LUN is For the initial identification value, create a data change bitmap for the third LUN, change the data change identification of the third LUN to the first identification value, based on the configured data synchronization service from the first LUN to the third LUN, and the first LUN Record the difference of the data synchronization service, synchronize the incremental data of the first LUN to the third LUN, change the data change flag of the third LUN to the second flag value, and update the data change bitmap of the third LUN .

As an embodiment, the above-mentioned duplication service may also be replaced by other data synchronization services, such as a mirroring service, a copying service, and the like.

Step 102, when the second storage device imports the third LUN belonging to the other storage device to the second storage device, it is determined that the third LUN has a data synchronization service belonging to the second storage device and a data synchronization service belonging to the second storage device. After the data synchronization service of other storage devices, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized from the third LUN to the second LUN data synchronization service, change the data change flag of the third LUN to the first flag value, and initialize the data change bitmap of the third LUN; when the third LUN processes a write command, change the data of the third LUN The change flag is the second flag value, and the data change bitmap is updated; according to the configured data synchronization service from the third LUN to the second LUN, the incremental data of the third LUN is synchronized to the second LUN. In the LUN.

In this embodiment, the above-mentioned second LUN is designated to store the data copy of the production data volume, and the second LUN is created in the second storage device.

Here, the second storage device is just named for convenience of description, and is not used to limit a certain device.

The second LUN is only named for convenience of description, and is not used to limit a certain LUN.

In this embodiment, the data synchronization service from the third LUN to the second LUN has been configured in the second storage device, and the initial data synchronization from the third LUN to the second LUN has been completed.

In this embodiment, after the first storage device completes incremental synchronization from the first LUN to the third LUN, the third LUN is pulled out and inserted into the second storage device. When the second storage device imports the third LUN, after determining that both the data synchronization service of the second storage device and the data synchronization service of other storage devices exist on the third LUN, it checks the data change identifier of the third LUN, if it is the first Two identifier values indicate that the third LUN has written data on other storage devices, and the data changes have been recorded through the data change bitmap. Based on this, it is necessary to synchronize the data change bitmap to the third LUN on the second storage device. The data synchronization service enables the second storage device to perceive the data changes of the third LUN on other storage devices. Taking the copy service as an example, the third LUN is used as the source LUN of the copy service, and the data changes on the third LUN are recorded through the difference bitmap, and the second LUN is used as the target LUN of the copy service, and the second LUN is recorded through the difference bitmap When synchronizing the data change bitmap of the third LUN to the copy service from the third LUN to the second LUN, the data change bitmap of the third LUN will be used as the difference bitmap of the first LUN, so that The difference bitmap of the first LUN includes the data change bitmap of the third LUN.

Because the third LUN also has data synchronization services belonging to other storage devices, that is, other storage devices are concerned about the data changes of the third LUN on the second storage device, so after synchronizing the data change bitmap of the third LUN to the third After the data synchronization service from the LUN to the second LUN, it is also necessary to initialize the data change bitmap of the third LUN, and change the data change flag of the third LUN to the first flag value; when the third LUN processes the write command, it will modify the data change bitmap Mark it as the second identification value, and change the value of the bit corresponding to the storage block corresponding to the write command in the data change bitmap to 1, that is, record the data change of the third LUN on the second storage device through the data change bitmap , so that other storage devices can mark the data change of the third LUN on the second storage device through the data change identifier and the data change bitmap of the third LUN.

When the second storage device synchronizes the incremental data of the first LUN to the third LUN according to the configured data synchronization service from the third LUN to the second LUN, taking the copy service as an example, when starting the third LUN to the second LUN When copying a LUN, merge the difference bitmap recorded on the second LUN into the difference bitmap of the third LUN, and synchronize the difference data from the third LUN to the second LUN according to the merged difference bitmap of the third LUN In , incremental synchronization is implemented.

As an embodiment, after the second storage device determines that the third LUN has data synchronization services belonging to the second storage device and data synchronization services belonging to other storage devices, if it detects that the data change flag of the third LUN is the first identification value , it means that the third LUN has not written data on other storage devices; the third LUN changes the data change flag of the third LUN to the second flag value when processing the write command, and updates the data change bitmap; according to The configured data synchronization service from the third LUN to the second LUN, and the difference of the data synchronization service recorded by the second LUN, synchronize the incremental data of the third LUN to the second LUN.

As another embodiment, after the second storage device determines that there are data synchronization services belonging to the second storage device and data synchronization services belonging to other storage devices in the third LUN, if it is detected that the data change identifier of the third LUN is the initial identification value , then create a data change bitmap for the third LUN, change the data change flag of the third LUN to the first flag value; when the third LUN processes the write command, change the data change flag of the third LUN to the second flag value , update the data change bitmap; synchronize the incremental data of the third LUN to the second LUN according to the configured data synchronization service from the third LUN to the second LUN and the difference of the data synchronization service recorded in the second LUN middle.

As an embodiment, the above-mentioned copy service may also be replaced by other data synchronization services, such as a mirroring service, a duplication service, and the like.

So far, the description shown in FIG. 1 is completed. It can be seen from the flowchart shown in FIG. 1 that in this application, the first storage device determines whether the data of the third LUN on other storage devices has changed through the data change identifier of the third LUN, that is, the third LUN is in the Whether data has been written on other storage devices, and for the data change flag indicating that the data has changed, synchronize the data change bitmap of the third LUN to the data synchronization service from the first LUN to the third LUN, such as a copy service, so that The first storage device can sense the data change of the third LUN on other storage devices, and change the data change flag of the third LUN to the first flag value, initialize the data change bitmap of the third LUN, and based on the Configured data synchronization services, such as replication services, synchronize the data of the first LUN to the third LUN, and update the data change ID and data change bitmap of the third LUN; the second storage device passes the data change ID and data of the third LUN The change bitmap senses the data change of the third LUN on other storage devices, and synchronizes the data change bitmap of the third LUN to the data synchronization service from the third LUN to the second LUN, such as a copy service, and changes the data of the third LUN. The data change flag is the first flag value, the data change bitmap of the third LUN is initialized, and when the third LUN is processing the write command, the data change flag of the third LUN is changed to the second flag value, and the data change bitmap is updated. Bitmap, so that when the third LUN is imported to other storage devices, the data changes of the third LUN are sensed, and the data increment of the third LUN is synchronized to the second LUN according to the configured data synchronization service. In this way, during the process of data migration, there is no need to repeatedly configure and disable the data synchronization service on the first storage device and the second storage device, and data incremental synchronization can be performed according to the data change bitmap and the data change identifier. Applying the migration method provided by the embodiment of the present application can reduce the operation complexity in the migration process, shorten the migration time, and improve the migration efficiency.

After the process shown in FIG. 1 is completed, as an embodiment, the method further includes: the first storage device determines that the third LUN has data synchronization services belonging to the first storage device and does not exist data synchronization services belonging to other storage devices. After the data synchronization service of the device, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized from the first LUN to the third LUN data synchronization service of the third LUN, change the data change identifier of the third LUN to the initial identifier value, delete the data change bitmap of the third LUN, according to the configured data from the first LUN to the third LUN The synchronization service is to synchronize the incremental data of the first LUN to the third LUN.

This means that the third LUN has a data synchronization service belonging to the first storage device, and the first storage device cares about the data changes of the third LUN on other storage devices. Synchronize the data change bitmap of the third LUN to the data synchronization service from the first LUN to the third LUN, so that the data synchronization service from the first LUN to the third LUN can perceive the data changes of the third LUN on other storage devices ; In addition, the third LUN does not have data synchronization services belonging to other storage devices, that is, no storage device cares about the data changes of the third LUN on the first storage device. Therefore, after synchronizing the data change bitmap of the third LUN After the data synchronization service from the first LUN to the third LUN, the data change identifier of the third LUN may be changed to an initial identifier value, and the data change bitmap of the third LUN may be deleted. In some embodiments, according to the configured data synchronization service from the first LUN to the third LUN, when incrementally synchronizing the data of the first LUN to the third LUN, the difference bitmap after merging on the first LUN can be Realize incremental synchronization. During incremental synchronization, because the data change ID of the third LUN is the initial ID value, the third LUN does not update the data change ID and data change bitmap when processing write commands, improving the processing efficiency of write commands. .

In some other embodiments, after the second storage device determines that the third LUN has data synchronization services belonging to the second storage device and does not have data synchronization services belonging to other storage devices, if it is checked that the third LUN The data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the third LUN to the second LUN, and the data change flag of the third LUN is changed is the initial identification value, delete the data change bitmap of the third LUN, and synchronize the incremental data of the third LUN to the second LUN according to the configured data synchronization service from the third LUN to the second LUN. In the first LUN.

This means that the third LUN has a data synchronization service belonging to the second storage device, and the second storage device cares about the data changes of the third LUN on other storage devices. Synchronize the data change bitmap of the third LUN to the data synchronization service from the third LUN to the second LUN, so that the data synchronization service from the third LUN to the second LUN can perceive the data changes of the third LUN on other storage devices ; In addition, the third LUN does not have data synchronization services belonging to other storage devices, that is, no storage device cares about the data changes of the third LUN on the second storage device, therefore, after synchronizing the data change bitmap of the third LUN After the data synchronization service from the third LUN to the second LUN, the data change identifier of the third LUN can be changed to the initial identifier value, and the data change bitmap of the third LUN can be deleted. In this way, the third LUN is processing the write When the command is executed, the data change flag and the data change bitmap are not updated, which improves the processing efficiency of the write command. In some embodiments, according to the configured data synchronization service from the third LUN to the second LUN, when incrementally synchronizing the data of the third LUN to the second LUN, according to the merged difference bitmap on the third LUN Implement incremental synchronization.

As another embodiment, the method further includes: after the first storage device determines that there is no data synchronization service belonging to the first storage device and there is a data synchronization service belonging to other storage devices on the third LUN, changing the The data change flag of the third LUN is a first flag value, and the data change bitmap of the third LUN is initialized. This means that the third LUN does not have data synchronization services belonging to the first storage device, and the first storage device does not care about the data changes of the third LUN on other storage devices. Therefore, it is not necessary to check the data change identifier and Data change bitmap; In addition, the third LUN has data synchronization services belonging to other storage devices, and other storage devices are concerned about the data changes of the third LUN on the first storage device, so change the data change identification of the third LUN Be the first identification value, initialize the data change bitmap of the third LUN, so that when the third LUN processes the write command, change the data change identification of the third LUN to the second identification value, update the data change bitmap, In order to sense the data changes of the third LUN when it is imported to other storage devices.

As some other embodiments, the method further includes: after the second storage device determines that there is no data synchronization service belonging to the second storage device and there is a data synchronization service belonging to other storage devices on the third LUN, changing the The data change flag of the third LUN is a first flag value, and the data change bitmap of the third LUN is initialized. This means that the third LUN does not have data synchronization services belonging to the second storage device, and the second storage device does not care about the data changes of the third LUN on other storage devices. Therefore, it is not necessary to check the data change identifier and Data change bitmap; In addition, the third LUN has data synchronization services belonging to other storage devices, and other storage devices are concerned about the data change of the third LUN on the second storage device, so change the data change identification of the third LUN Be the first identification value, initialize the data change bitmap of the third LUN, so that when the third LUN processes the write command, change the data change identification of the third LUN to the second identification value, update the data change bitmap, In order to sense the data changes of the third LUN when it is imported to other storage devices.

As another embodiment, the method further includes: after the first storage device determines that there is no data synchronization service belonging to the first storage device and no data synchronization service belonging to other storage devices on the third LUN, changing The data change identifier of the third LUN is an initial identifier value, and the data change bitmap of the third LUN is deleted. This means that the third LUN does not have data synchronization services belonging to the first storage device, and the first storage device does not care about the data changes of the third LUN on other storage devices. Therefore, it is not necessary to check the data change identifier and Data change bitmap; In addition, the third LUN does not have data synchronization services belonging to other storage devices, and other storage devices do not care about the data changes of the third LUN on the first storage device, so change the data of the third LUN The change flag is the initial flag value, and the data change bitmap of the third LUN is deleted. In this way, when the third LUN processes the write command, the data change flag and the data change bitmap are not updated, thereby improving the write command processing efficiency.

As another embodiment, the method further includes: after the second storage device determines that there is no data synchronization service belonging to the second storage device and no data synchronization service belonging to other storage devices on the third LUN, changing The data change identifier of the third LUN is an initial identifier value, and the data change bitmap of the third LUN is deleted. This means that the third LUN does not have data synchronization services belonging to the second storage device, and the second storage device does not care about the data changes of the third LUN on other storage devices. Therefore, it is not necessary to check the data change identifier and Data change bitmap; In addition, the third LUN does not have data synchronization services belonging to other storage devices, and other storage devices do not care about the data changes of the third LUN on the second storage device, so change the data of the third LUN The change flag is the initial flag value, and the data change bitmap of the third LUN is deleted. In this way, when the third LUN processes the write command, the data change flag and the data change bitmap are not updated, thereby improving the write command processing efficiency.

In some embodiments, as shown in FIG. 2, it is determined in the above step 101 that the third LUN has data synchronization services belonging to the first storage device and data synchronization services belonging to other storage devices, including the following steps 201-step 206:

Step 201, the first storage device checks whether there is a device identifier belonging to the first storage device in the data synchronization service configuration recorded by the third LUN, if yes, execute step 202, if not, execute step 203

In this embodiment, the third LUN carries a device identifier used to represent the unique identity of the first storage device.

Step 202, determining that the third LUN has a data synchronization service belonging to the first storage device.

Step 203, determining that no data synchronization service belonging to the first storage device exists on the third LUN.

Step 204, check whether there is a device identifier not belonging to the first storage device in the data synchronization service configuration recorded by the third LUN, if yes, perform step 205, otherwise, perform step 206.

In this step, as long as it is determined that the third LUN carries the device identifier of the first storage device, it means that the third LUN has a data synchronization service belonging to the first storage device, and it is found that the third LUN also carries devices other than the first storage device ID, it means that the third LUN still has data synchronization services belonging to other storage devices.

It should be noted that step 201 and step 204 are performed in no sequence, and step 201 or step 204 may be performed first, which is not limited in this embodiment.

Step 205, determining that the third LUN has data synchronization services belonging to other storage devices.

Step 206, determining that the third LUN does not have data synchronization services belonging to other storage devices.

Based on the above embodiment, as shown in FIG. 3 , the second storage device in step 102 determines that the third LUN has data synchronization services belonging to the second storage device and does not have data synchronization services belonging to other storage devices. , including steps 301 to 306:

Step 301, the second storage device checks whether there is a device identifier belonging to the second storage device in the data synchronization service configuration recorded by the third LUN, if yes, execute step 302, and if not, execute step 303.

In this embodiment, the third LUN carries a device identifier used to represent the unique identity of the second storage device.

Step 302, determining that the third LUN has a data synchronization service belonging to the second storage device.

Step 303, determining that no data synchronization service belonging to the second storage device exists in the third LUN.

Step 304 , check whether there is a device identifier not belonging to the second storage device in the data synchronization service configuration of the third LUN record, if yes, execute step 305 , otherwise, execute step 306 .

In this step, as long as it is determined that the third LUN carries the device ID of the second storage device, it means that the third LUN has a data synchronization service belonging to the second storage device, and it is found that the third LUN also carries the device ID of the second storage device , it means that the third LUN still has data synchronization services belonging to other storage devices.

It should be noted that step 301 and step 304 are not executed sequentially, and step 301 or step 304 may be executed first, which is not limited in this embodiment.

Step 305, determining that the third LUN has data synchronization services belonging to other storage devices.

Step 306, determining that the third LUN does not have data synchronization services belonging to other storage devices.

It can be seen that applying the method provided by the embodiment of the present application can quickly and accurately determine whether the third LUN has a data synchronization service belonging to the storage device corresponding to the device ID and whether there is data belonging to other storage devices other than the device ID through the device ID. Synchronize business.

As an embodiment, the above-mentioned device identifier is a UUID (Universally Unique Identifier, Universally Unique Identifier) or a device serial number.

If the actual usage requirements of the business change, for example, when the third LUN is used for a long time on the first storage device or the second storage device and is no longer used for moving data volumes, the data synchronization service belonging to other storage devices on the third LUN is no longer It needs to be reserved. Based on this, the data synchronization service belonging to other storage devices can be manually deleted. As an embodiment, the method further includes: after the first storage device deletes the data synchronization service belonging to other storage devices on the third LUN, changing the data change identifier of the third LUN to an initial identifier value, At the same time, the data change bitmap of the third LUN is deleted. In this way, when the third LUN on the first storage device no longer has data synchronization services belonging to other storage devices, it means that other storage devices do not care about the data changes of the third LUN on the first storage device. Therefore, Change the data change flag of the third LUN to the initial flag value, and delete the data change bitmap of the third LUN, so that the third LUN does not update the data change flag and the data change bitmap when processing the write command, thereby improving Write command processing efficiency. As another embodiment, after the second storage device deletes the data synchronization service belonging to other storage devices on the third LUN, it changes the data change identifier of the third LUN to an initial identifier value, and deletes the Data change bitmap of the third LUN. In this way, when the third LUN on the second storage device no longer has services belonging to other storage devices, it means that other storage devices do not care about the data changes of the third LUN on the second storage device. The data change flag of the third LUN is the initial flag value, and the data change bitmap of the third LUN is deleted. In this way, when the third LUN processes the write command, the data change flag and the data change bitmap are not updated, and the write command is improved. Processing efficiency.

So far, the description of the above embodiment is completed.

Referring to FIG. 4 , FIG. 4 is a system structure diagram of data migration 400 provided in this embodiment. The system includes at least a first storage device 401 and a second storage device 402;

The first storage device 401 is configured to, when importing a third LUN belonging to other storage devices to the first storage device, determine that the third LUN has a data synchronization service belonging to the first storage device and belongs to other storage devices After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization of the first LUN to the third LUN Service, initialize the data change bitmap of the third LUN, and change the change data identifier of the third LUN to the first identifier value; according to the configured data from the first LUN to the third LUN Synchronization service, synchronizing the data increment of the first LUN to the third LUN, changing the data change identifier of the third LUN to a second identifier value, and updating the data change bitmap of the third LUN; The first LUN is designated for producing data volumes, the third LUN is designated for moving data volumes, the first identification value is used to indicate that the data has not changed, and the second identification value is used to indicate that the data change, the data change bitmap is used to record the data change;

The second storage device 402 is configured to, when importing the third LUN belonging to the other storage device to the second storage device, determine that the third LUN has a data synchronization service belonging to the second storage device and After the data synchronization service belonging to other storage devices, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the third LUN to the second The data synchronization service of the LUN changes the data change flag of the third LUN to the first flag value, and initializes the data change bitmap of the third LUN; when the third LUN processes a write command, changes the data change flag of the third LUN The data change is identified as the second identification value, and the data change bitmap is updated; according to the configured data synchronization service from the third LUN to the second LUN, the data increment of the third LUN is synchronized to the second LUN. In the second LUN; the second LUN is designated to store the data copy of the production data volume.

As an embodiment, the first storage device 401 is further configured to determine that the third LUN has a data synchronization service belonging to the first storage device and does not have a data synchronization service belonging to other storage devices, if it is checked that the If the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN, and the third LUN is changed. The data change identifier of the first LUN is the initial identifier value, the data change bitmap of the third LUN is deleted, and the data of the first LUN is transferred to the third LUN according to the configured data synchronization service from the first LUN to the third LUN. Incremental synchronization to the third LUN; or/and

The second storage device 402 is further configured to determine that the third LUN has a data synchronization service belonging to the second storage device and does not have a data synchronization service belonging to other storage devices, if the third LUN is detected If the data change flag is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the third LUN to the second LUN, and the data change flag of the third LUN is changed to the initial flag value, delete the data change bitmap of the third LUN, and synchronize the incremental data of the third LUN to the second LUN according to the configured data synchronization service from the third LUN to the second LUN. In a LUN.

As an embodiment, the first storage device 401 is further configured to change the third LUN after determining that there is no data synchronization service belonging to the first storage device and there is a data synchronization service belonging to other storage devices in the third LUN. The data change flag of the third LUN is the first flag value, and the data change bitmap of the third LUN is initialized; or/and

The second storage device is further configured to change the data change identifier of the third LUN after determining that the third LUN does not have a data synchronization service belonging to the second storage device and that there is a data synchronization service belonging to other storage devices For the first identification value, initialize the data change bitmap of the third LUN.

As an embodiment, the first storage device 401 is further configured to change the third LUN after determining that there is no data synchronization service belonging to the first storage device and no data synchronization service belonging to other storage devices. The data change identifier of the third LUN is an initial identifier value, and the data change bitmap of the third LUN is deleted; or/and

The second storage device 402 is further configured to change the data of the third LUN after determining that there is no data synchronization service belonging to the second storage device and no data synchronization service belonging to other storage devices in the third LUN. The change identifier is the initial identifier value, and the data change bitmap of the third LUN is deleted.

As an embodiment, the first storage device 401 determines that the third LUN has data synchronization services belonging to the first storage device and data synchronization services belonging to other storage devices, specifically for:

Find whether there is a device identifier belonging to the first storage device in the data synchronization service configuration recorded by the third LUN, if yes, determine that the third LUN has a data synchronization service belonging to the first storage device, if not , then determine that the third LUN does not have a data synchronization service belonging to the first storage device; check whether there is a device identifier that does not belong to the first storage device in the data synchronization service configuration recorded by the third LUN, if , then determine that the third LUN has a data synchronization service belonging to other storage devices, if not, then determine that the third LUN does not have a data synchronization service belonging to the other storage device;

The second storage device 402 determines that the third LUN has data synchronization services belonging to the second storage device and data synchronization services belonging to other storage devices, specifically for:

Find whether there is a device identifier of the second storage device in the data synchronization service configuration recorded by the third LUN, and if so, determine that the third LUN is stored in the data synchronization service belonging to the second storage device, if No, then determine that the third LUN does not have a data synchronization service belonging to the second storage device; check whether there is a device identifier that does not belong to the second storage device in the data synchronization service configuration recorded by the third LUN If yes, determine that the third LUN has data synchronization services belonging to other storage devices, and if not, determine that the third LUN does not have data synchronization services belonging to other storage devices.

As an embodiment, the first storage device 401 is further configured to change the data change identifier of the third LUN to an initial identifier value after deleting the data synchronization service belonging to other storage devices on the third LUN, and at the same time delete the data change bitmap of the third LUN; or/and

The second storage device 402 is further configured to change the data change identifier of the third LUN to an initial identifier value after deleting the data synchronization service belonging to other storage devices on the third LUN, and delete the third LUN at the same time. The data change bitmap of the LUN.

So far, the description shown in FIG. 4 is completed.

It can be seen from the flow chart shown in FIG. 4 that in this application, the first storage device determines whether the data of the third LUN has changed through the data change identifier of the third LUN, that is, whether the third LUN is on another storage device. The data is written, and for the data change flag indicating that the data has changed, the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN, so that the first storage device can perceive the third LUN The data change of the LUN on other storage devices, and change the data change identification of the third LUN to the first identification value, initialize the data change bitmap of the third LUN, and change the data change bitmap of the third LUN according to the configured data synchronization service. The incremental data of one LUN is synchronized to the third LUN, and the data change identifier and data change bitmap of the third LUN are updated; the second storage device perceives that the third LUN is in other The data on the storage device changes, and the data change bitmap of the third LUN is synchronized to the data synchronization service from the third LUN to the second LUN, the data change identifier of the third LUN is changed to the first identifier value, and the The data change bitmap of the third LUN, when the third LUN is processing the write command, change the data change flag of the third LUN to the second flag value, update the data change bitmap, so that the third LUN is imported into other storage The device is aware of its data changes, and according to the configured data synchronization service, the data increment of the third LUN is synchronized to the second LUN. In this way, during the process of data migration, there is no need to repeatedly configure and disable the data synchronization service on the first storage device and the second storage device, and data incremental synchronization can be performed according to the data change bitmap and the data change identification. Applying the migration method provided by the embodiment of the present application can reduce the operation complexity in the migration process, shorten the migration time, and improve the migration efficiency.

For the implementation process of the functions and functions of each unit in the above system, please refer to the implementation process of the corresponding steps in the above method for details, and will not be repeated here.

As for the system embodiment, since it basically corresponds to the method embodiment, for related parts, please refer to the part description of the method embodiment. The system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this application. It can be understood and implemented by those skilled in the art without creative effort.

So far, the description of the device shown in FIG. 4 is completed.

For the electronic device provided in the embodiment of the present application, from a hardware level, a schematic diagram of a hardware architecture may be shown in FIG. 5 . It includes: a machine-readable storage medium and a processor, wherein: the machine-readable storage medium stores machine-executable instructions that can be executed by the processor; the processor is configured to execute the machine-executable instructions, so as to realize the above examples Publicly applied to data migration operations.

In the machine-readable storage medium provided by the embodiment of the present application, the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the The processor implements the data migration operations disclosed in the above examples.

Here, a machine-readable storage medium may be any electronic, magnetic, optical, or other physical storage device that may contain or store information, such as executable instructions, data, and the like. For example, the machine-readable storage medium can be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), solid-state hard disk, any type of storage disk ( such as CD, DVD, etc.), or similar storage media, or a combination thereof.

The systems, devices, modules, or units described in the above embodiments can be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementing device is a computer, which may take the form of a personal computer, laptop computer, cellular phone, camera phone, smart phone, personal digital assistant, media player, navigation device, e-mail device, game control device, etc. desktops, tablets, wearables, or any combination of these.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

Moreover, these computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, The instruction means implements the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable equipment to produce computer-implemented processing, so that the information executed on the computer or other programmable equipment The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

As for the device embodiment, since it basically corresponds to the method embodiment, for related parts, please refer to the part description of the method embodiment. The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of the present application. It can be understood and implemented by those skilled in the art without creative effort.

The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application should be included in the application. within the scope of protection.

Claims (14)

1. A data migration method, characterized in that the method comprises: When the first storage device imports a third LUN belonging to other storage devices to the first storage device, it is determined that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices Afterwards, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN, and the data synchronization service of the third LUN is initialized. the data change bitmap of the third LUN, and change the change data identifier of the third LUN to the first identifier value; according to the configured data synchronization service from the first LUN to the third LUN, change the Synchronize the data increment of the first LUN to the third LUN, change the data change flag of the third LUN to a second flag value, and update the data change bitmap of the third LUN; the first The LUN is designated for producing data volumes, the third LUN is designated for moving data volumes, the first identification value is used to indicate that data has not changed, and the second identification value is used to indicate that data has changed, so The above data change bitmap is used to record data changes; When the second storage device imports the third LUN belonging to the other storage device to the second storage device, it is determined that the third LUN has a data synchronization service belonging to the second storage device and belongs to other storage devices After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization of the third LUN to the second LUN business, change the data change identifier of the third LUN to the first identifier value, initialize the data change bitmap of the third LUN; when the third LUN processes the write command, change the data change identifier of the third LUN to The second identification value is to update the data change bitmap; according to the configured data synchronization service from the third LUN to the second LUN, synchronize the data increment of the third LUN to the second LUN; The second LUN is designated to store the data copy of the production data volume. 2. The method according to claim 1, characterized in that the method further comprises: After the first storage device determines that the third LUN has a data synchronization service belonging to the first storage device and does not have a data synchronization service belonging to other storage devices, if it is detected that the data change flag of the third LUN is The second identification value, synchronizing the data change bitmap of the third LUN to the data synchronization service from the first LUN to the third LUN, changing the data change identification of the third LUN to the initial identification value, Delete the data change bitmap of the third LUN, and synchronize the incremental data of the first LUN to the third LUN according to the configured data synchronization service from the first LUN to the third LUN in; or/and After the second storage device determines that the third LUN has a data synchronization service belonging to the second storage device and there is no data synchronization service belonging to other storage devices, if it is detected that the data change flag of the third LUN is The second identification value, then synchronize the data change bitmap of the third LUN to the data synchronization service from the third LUN to the second LUN, change the data change identification of the third LUN to the initial identification value, and delete all According to the data change bitmap of the third LUN, the incremental data of the third LUN is synchronized to the first LUN according to the configured data synchronization service from the third LUN to the second LUN. 3. The method according to claim 1, characterized in that the method further comprises: After the first storage device determines that the third LUN does not have a data synchronization service belonging to the first storage device and that there is a data synchronization service belonging to other storage devices, it changes the data change identifier of the third LUN to the first An identification value, to initialize the data change bitmap of the third LUN; or/and After the second storage device determines that the third LUN does not have a data synchronization service belonging to the second storage device and that there is a data synchronization service belonging to other storage devices, it changes the data change identifier of the third LUN to the first The identifier value is used to initialize the data change bitmap of the third LUN. 4. The method according to claim 1, characterized in that the method further comprises: After the first storage device determines that there is no data synchronization service belonging to the first storage device and no data synchronization service belonging to other storage devices on the third LUN, change the data change flag of the third LUN to initial Identification value, delete the data change bitmap of the third LUN; or/and After the second storage device determines that there is no data synchronization service belonging to the second storage device and no data synchronization service belonging to other storage devices on the third LUN, change the data change flag of the third LUN to initial The identifier value is used to delete the data change bitmap of the third LUN. 5. The method according to any one of claims 1-4, wherein the first storage device determines that the third LUN has data synchronization services belonging to the first storage device and other storage devices data synchronization services, including: The first storage device searches whether there is a device identifier belonging to the first storage device in the data synchronization service configuration recorded by the third LUN, and if so, determines that the third LUN has a device identifier belonging to the first storage device. Data synchronization service, if not, then determine that the third LUN does not have a data synchronization service belonging to the first storage device; check whether there is a data synchronization service configuration in the third LUN record that does not belong to the first storage device The device identifier of the device, if yes, then determine that the third LUN has a data synchronization service belonging to other storage devices, if not, then determine that the third LUN does not have a data synchronization service belonging to the other storage device; The second storage device determines that the third LUN has data synchronization services belonging to the second storage device and data synchronization services belonging to other storage devices, including: The second storage device searches for the data synchronization service configuration recorded by the third LUN to see if there is a device identifier of the second storage device, and if so, determines that the third LUN has a device identifier belonging to the second storage device. Data synchronization service, if not, then determine that the third LUN does not have a data synchronization service belonging to the second storage device; check whether there is a data synchronization service configuration recorded in the third LUN that does not belong to the second storage device The device identifier of the storage device, if yes, determine that the third LUN has data synchronization services belonging to other storage devices, and if not, determine that the third LUN does not have data synchronization services belonging to the other storage devices. 6. The method according to any one of claims 1 to 4, characterized in that the method further comprises: After the first storage device deletes the data synchronization service belonging to other storage devices on the third LUN, it changes the data change identifier of the third LUN to an initial identifier value, and deletes the data change of the third LUN at the same time. bitmap; or/and After the second storage device deletes the data synchronization service belonging to other storage devices on the third LUN, it changes the data change identifier of the third LUN to an initial identifier value, and deletes the data change of the third LUN at the same time. bitmap. 7. A data migration system, characterized in that the system includes at least a first storage device and a second storage device; The first storage device is configured to, when importing a third LUN belonging to other storage devices to the first storage device, determine that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices. After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data synchronization service from the first LUN to the third LUN , initialize the data change bitmap of the third LUN, and change the change data flag of the third LUN to a first flag value; according to the configured data synchronization from the first LUN to the third LUN Business, synchronizing the data increment of the first LUN to the third LUN, changing the data change identifier of the third LUN to a second identifier value, and updating the data change bitmap of the third LUN; The first LUN is designated for producing data volumes, the third LUN is designated for moving data volumes, the first identification value is used to indicate that data has not changed, and the second identification value is used to indicate that data has change, the data change bitmap is used to record the data change; The second storage device is configured to, when importing the third LUN belonging to the other storage device to the second storage device, determine that the third LUN has a data synchronization service belonging to the second storage device and a After the data synchronization service of other storage devices, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized from the third LUN to the second LUN data synchronization service, change the data change flag of the third LUN to the first flag value, and initialize the data change bitmap of the third LUN; when the third LUN processes a write command, change the data of the third LUN The change flag is the second flag value, and the data change bitmap is updated; according to the configured data synchronization service from the third LUN to the second LUN, the incremental data of the third LUN is synchronized to the second LUN. In the LUN; the second LUN is designated to store the data copy of the production data volume. 8. The system according to claim 7, wherein the first storage device is further configured to determine that the third LUN has a data synchronization service belonging to the first storage device and there is no data synchronization service belonging to other storage devices. After the data synchronization service, if it is checked that the data change flag of the third LUN is the second flag value, then the data change bitmap of the third LUN is synchronized to the data from the first LUN to the third LUN Synchronization service, change the data change identification of the third LUN to the initial identification value, delete the data change bitmap of the third LUN, and synchronize the data from the first LUN to the third LUN according to the configuration , synchronizing incremental data of the first LUN to the third LUN; or/and the second storage device is further configured to determine that the third LUN has a data synchronization service belonging to the second storage device and after there is no data synchronization service belonging to other storage devices, if it is checked that the data change flag of the third LUN is the second flag value, then synchronizing the data change bitmap of the third LUN to the third LUN For the data synchronization service to the second LUN, change the data change identifier of the third LUN to the initial identifier value, delete the data change bitmap of the third LUN, and transfer the data to the third LUN according to the configuration of the third LUN. The data synchronization service of the second LUN is to synchronize the incremental data of the third LUN to the first LUN. 9. The system according to claim 7, wherein the first storage device is further configured to determine that the third LUN does not have a data synchronization service belonging to the first storage device and that there is a data synchronization service belonging to other storage devices. After the data synchronization service, change the data change identification of the third LUN to the first identification value, and initialize the data change bitmap of the third LUN; or/and The second storage device is further configured to change the data change identifier of the third LUN after determining that the third LUN does not have a data synchronization service belonging to the second storage device and that there is a data synchronization service belonging to other storage devices For the first identification value, initialize the data change bitmap of the third LUN. 10. The system according to claim 7, wherein the first storage device is further configured to determine that the third LUN does not have a data synchronization service belonging to the first storage device and does not have a data synchronization service belonging to other storage devices After the data synchronization service, change the data change identification of the third LUN to the initial identification value, and delete the data change bitmap of the third LUN; or/and The second storage device is further configured to change the data change of the third LUN after determining that there is no data synchronization service belonging to the second storage device and no data synchronization service belonging to other storage devices on the third LUN. The identification is an initial identification value, and the data change bitmap of the third LUN is deleted. 11. The system according to any one of claims 7-10, wherein it is determined in the first storage device that the third LUN has a data synchronization service belonging to the first storage device and a data synchronization service belonging to other storage devices. Device data synchronization service, specifically used for: Find whether there is a device identifier belonging to the first storage device in the data synchronization service configuration recorded by the third LUN, if yes, determine that the third LUN has a data synchronization service belonging to the first storage device, if not , then determine that the third LUN does not have a data synchronization service belonging to the first storage device; check whether there is a device identifier that does not belong to the first storage device in the data synchronization service configuration recorded by the third LUN, if , then determine that the third LUN has a data synchronization service belonging to other storage devices, if not, then determine that the third LUN does not have a data synchronization service belonging to the other storage device; It is determined in the second storage device that the third LUN has data synchronization services belonging to the second storage device and data synchronization services belonging to other storage devices, specifically for: Find whether there is a device identifier of the second storage device in the data synchronization service configuration recorded by the third LUN, and if so, determine that the third LUN is stored in the data synchronization service belonging to the second storage device, if No, then determine that the third LUN does not have a data synchronization service belonging to the second storage device; check whether there is a device identifier that does not belong to the second storage device in the data synchronization service configuration recorded by the third LUN If yes, determine that the third LUN has data synchronization services belonging to other storage devices, and if not, determine that the third LUN does not have data synchronization services belonging to other storage devices. 12. The system according to any one of claims 7-10, wherein the first storage device is further configured to, after deleting the data synchronization service belonging to other storage devices on the third LUN, save the The data change flag of the third LUN is changed to the initial flag value, and the data change bitmap of the third LUN is deleted at the same time; or/and The second storage device is further configured to, after deleting the data synchronization service belonging to other storage devices on the third LUN, change the data change identifier of the third LUN to an initial identifier value, and delete the third LUN at the same time The data change bitmap for . 13. An electronic device, characterized in that it includes a processor and a machine-readable storage medium, the machine-readable storage medium storing machine-executable instructions that can be executed by the processor; the processor is used to execute machine Executable instructions to implement the method steps described in any one of claims 1-6. 14. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any step of the method according to claims 1-6 is implemented.

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