CN114564148A - Method, device, equipment and storage medium for writing data to source volume in snapshot process - Google Patents

Abstract

The present application relates to a method, apparatus, device and storage medium for writing data to a source volume during a snapshot process. The method includes: receiving an instruction to create a snapshot volume at the target moment of the target source volume; redirecting the target source volume to a new source volume; allocating a new write address to each data block of the new source volume; When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume to the target data in the new source volume according to the new write address piece. In the present application, by redirecting the target source volume to a new source volume, a new write address is allocated to each data block of the new source volume, and when a data write operation is performed on the target source volume, data can be written into the new source volume. In the write address, the write operation to the target source data can be completed with one write, which improves the write performance compared to the traditional technology that requires one read and two write operations when the source volume data is changed for the first time.

Description

Method, device, device and storage medium for writing data to source volume during snapshot

technical field

The present application relates to the technical field of data storage, and in particular, to a method, apparatus, device and storage medium for writing data to a source volume during a snapshot process.

Background technique

A snapshot is a fully available copy of a specified set of data that includes an image of the corresponding data at a point in time (the point in time when the copy started). A snapshot can be a copy of the data it represents, or a replica of the data. Currently, storage snapshot technologies can be roughly divided into two categories: full snapshots and incremental snapshots. The main implementation technology of full snapshots is mirror separation, the creation of snapshots is slow, the snapshot space is the same as the size of the source volume, and there is no dependency on the source volume after the snapshot is created. Incremental snapshot implementation technologies mainly include COW (copy-on-write) and ROW (redirect-on-write). Compared with full snapshots, incremental snapshots are faster to create and take up less space. Only when the source volume data changes, will it actually take up space. The COW snapshot volume depends on the source volume data. When the source volume data is changed for the first time, one read and two write operations are required, which affects the write performance of the source data volume.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a method, apparatus, device and storage medium for writing data to the source volume during the snapshot process, aiming at the above technical problems.

A method for writing data to a source volume during a snapshot, the method comprising:

Receive an instruction to create a snapshot volume at the target moment of the target source volume;

redirect the target source volume to the new source volume;

Allocate new write addresses for each data block of the new source volume;

When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume into the target data block in the new source volume according to the new write address.

In one embodiment, the above-mentioned method further includes:

Preload the read address and write address of each data block of the new source volume at the target time in the target cache, and the read address of each data block of the new source volume at the target time is the read address of each data block of the target source volume at the target time, The write address of each data block of the new source volume is the new write address;

Receive the read data instruction of the new source volume, and read the corresponding data from the read address of the new source volume in the target cache.

In one embodiment, the above-mentioned method further includes:

After the data to be written is written into the target data block, the read address of the target data block of the new source volume is asynchronously updated to the new write address in the target cache.

In one embodiment, the above-mentioned method includes:

redirect the snapshot volume to the target source volume;

Receive the read data command of the snapshot volume;

Read the data corresponding to the target moment from the read address of the target source volume according to the read data command of the snapshot volume;

Receive the write data command of the snapshot volume;

Write the data to be written in the data write command of the snapshot volume to the write address of the target source volume.

In one embodiment, the above-mentioned method further includes:

When receiving an instruction to create snapshot volumes corresponding to multiple times for the target source volume, create snapshot volumes corresponding to multiple times for the target source volume;

Assign corresponding identification information, read address and write address to each snapshot volume according to the target source volume;

When receiving a data read command for any snapshot volume among the snapshot volumes, read the corresponding read address from the corresponding read address of the snapshot volume according to the target identifier in the read data command for any snapshot volume among the snapshot volumes The data;

When receiving a data write command to any one of the snapshot volumes, write the corresponding data to the corresponding write address of the corresponding snapshot volume according to the target identifier in the data write command to any one of the snapshot volumes.

In one embodiment, the above-mentioned method further includes:

Asynchronously update the updated read address of the target data block to the new source volume.

In one embodiment, the above-mentioned redirecting the target source volume to the new source volume includes:

Modify the volume name of the target source volume to the volume name of the new source volume to redirect the target source volume to the new source volume.

A device for writing data to a source volume during a snapshot process, the device comprising:

a receiving module, used for receiving an instruction to create a snapshot volume at the target moment of the target source volume;

The redirection module is used to redirect the target source volume to the new source volume;

an allocation module for allocating a new write address for each data block of the new source volume;

The writing module is used to write the data to be written in the data writing instruction of the target source volume into the target data block in the new source volume according to the new writing address when receiving the writing data instruction of the new source volume.

A computer device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor implements the following steps when executing the computer program:

Receive an instruction to create a snapshot volume at the target moment of the target source volume;

redirect the target source volume to the new source volume;

Allocate new write addresses for each data block of the new source volume;

When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume into the target data block in the new source volume according to the new write address.

A computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

Receive an instruction to create a snapshot volume at the target moment of the target source volume;

redirect the target source volume to the new source volume;

Allocate new write addresses for each data block of the new source volume;

When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume into the target data block in the new source volume according to the new write address.

The method, device, device and storage medium for writing data to the source volume in the above snapshot process, by receiving an instruction to create a snapshot volume at the target moment of the target source volume; redirecting the target source volume to a new source volume; Each data block of the volume is assigned a new write address; when receiving the write data command of the new source volume, the data to be written in the write data command of the target source volume is written to the new source volume according to the new write address. target data block. In the present application, by redirecting the target source volume to the new source volume, a new write address is allocated to each data block of the new source volume, and the data can be written to the new write address when the data write operation is performed on the target source volume Compared with the COW method in the traditional technology, which requires one read and two write operations when the source volume data is changed for the first time, the write performance is improved. .

Description of drawings

1 is an application environment diagram of a method for writing data to a source volume in a snapshot process in one embodiment;

2 is a schematic flowchart of a method for writing data to a source volume in a snapshot process in one embodiment;

3 is a state diagram of a target source volume V at time T in one embodiment;

4 is a state diagram of the snapshot volume S1 and the target source volume after the snapshot volume S1 is created to the target source volume in another embodiment;

5 is a state diagram of the snapshot volume S1 and the target source volume after the snapshot volume S1 is created to the target source volume in another embodiment;

6 is a schematic flowchart of reading and writing data to a snapshot volume in one embodiment;

7 is a schematic flowchart of creating a plurality of snapshot volumes in one embodiment;

FIG. 8 is a structural block diagram of an apparatus for writing data to a source volume during a snapshot process in one embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

The method for writing data to a source volume during a snapshot process provided by the present application can be applied to a computer device. The computer device can be a terminal, and its internal structure diagram can be as shown in FIG. 1 . The computer equipment includes a processor, memory, a network interface, a display screen, and an input device connected by a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium, an internal memory. The nonvolatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the execution of the operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements a method of writing data to a source volume during a snapshot. The display screen of the computer equipment may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment may be a touch layer covered on the display screen, or a button, a trackball or a touchpad set on the shell of the computer equipment , or an external keyboard, trackpad, or mouse. Among them, the terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices

In one embodiment, as shown in FIG. 2 , a method for writing data to a source volume in a snapshot process is provided, and the method is applied to the terminal in FIG. 1 as an example to illustrate, including the following steps:

S11. Receive an instruction to create a snapshot volume at the target moment of the target source volume.

In this application, the above-mentioned target source volume is the volume to be snapshotted. The above snapshot volume is a fully available copy of the target source volume at a certain time. The copy includes an image of the target source volume at a point in time (the point in time when the copy started). A snapshot volume can be a copy of the data it represents, or a replica of the data.

The above-mentioned instruction for creating the snapshot volume of the target source volume may be an instruction triggered by the user operating the storage device. This command is used to create a corresponding snapshot volume for the target source volume.

S12. Redirect the target source volume to a new source volume.

In this application, the above-mentioned redirection refers to redirection, specifically by modifying the volume metadata of the target source volume, changing the volume name of the target source volume, and subsequently finding a new source volume when searching for a volume based on the name. The volume metadata is data that stores volume description information. Such as volume name, size and data addressing address of the volume.

S13. Allocate a new write address to each data block of the new source volume.

In the present application, after the snapshot volume is created, the target source volume needs to be redirected to obtain a new source volume, and a read address and a write address are further allocated to the new source volume. When assigning a read address to a new source volume, assign the read address of the target source volume to the new source volume, and when assigning a write address to the new source volume, obtain a new write address and assign it to the new source volume. Wherein, the new write address may be a continuous address. For example, assuming that the new source volume includes 4 data blocks, the new write addresses can be obtained as 5, 6, 7, and 8.

S14. When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume into the target data block in the new source volume according to the new write address.

In this application, the above-mentioned write data instruction is used to instruct to write data to the target source volume. The data write instruction may specifically carry the data to be written and the identification information of the target source volume. The identification information of the target source volume may be the volume name of the target source volume. In this application, since the target source volume is redirected to the new source volume, when writing data to the target source volume, it should be written to the write address corresponding to the new source volume.

Specifically, in this application, both the target source volume and the new source volume include a plurality of corresponding data blocks, and each data block has a corresponding read address and a write address. The above-mentioned write data instruction may specifically include a corresponding write address, and the write address is any one of the above-mentioned new write addresses. When writing the data to be written into the target source volume, the write address will be The input data is written into the corresponding target data block.

In one embodiment, the above-mentioned method may further include:

Preload the read address and write address of each data block of the new source volume at the target time in the target cache, and the read address of each data block of the new source volume at the target time is the read address of each data block of the target source volume at the target time, The write address of each data block of the new source volume is the new write address;

Receive the read data instruction of the new source volume, and read the corresponding data from the read address of the new source volume in the target cache.

In this application, the volume metadata of the target source volume needs to be preloaded in the target cache before the volume read/write to the target source volume. Since the target source volume is redirected to the new source volume after the snapshot volume is created, so , the volume metadata of the new source volume needs to be preloaded into the target cache, and the read and write addresses in the volume metadata are obtained from the target cache when the volume of the new source volume is subsequently read and written for volume read and write. The volume metadata of the new source volume may include the volume name of the new source volume, the size of the volume, the read address and the write address of the data of the volume, and the like.

Specifically, in this application, the read address of the above-mentioned new source volume is assigned as the read address of the target source volume, and the write address of the new source volume is assigned as a new write address. When the read address and the write address of the new source volume are preloaded, the read address of the target source volume and the above-mentioned new write address are loaded into the target cache.

Further, when a data read instruction from the target source volume is received, since the target source volume has been redirected, when data is read from the target source volume, it can be read from the read address of the new source volume. Specifically, the above-mentioned read data instruction of the target source volume may carry the read address to be read, and the terminal obtains the data stored in the read address to be read from the read address of the new source volume in the target cache.

In one embodiment, the above-mentioned method may further include:

After the data to be written is written into the target data block, the read address of the target data block of the new source volume is asynchronously updated to the new write address in the target cache.

In the present application, at the target time, the read address of the new source volume stored in the target cache is the read address of the original target source volume, and the write address is allocated as a new write address. After the target time, if the new source volume has data update, that is, new data is written, it will be written to the data block corresponding to the new address. At this time, the new source volume stored in the cache needs to be The read address is updated to the new write address, and when data is read from the new source volume later, it is not necessary to read from the snapshot volume directly from the new address. When reading data from the new source volume later, the updated read address can be read directly according to the updated read address (ie, the new write address) in the cache. The read address that has not been updated still needs to be read from the target source volume. Read the data at the target time in the read address.

In this application, the asynchronous update method is adopted, which has the advantage of non-blocking in parallel, that is, it returns directly after data is written, and the background updates the write address through a new thread. If the asynchronous update method is not used, the data needs to wait for the update write It only returns after the address, which takes a long time.

Please refer to FIG. 3 , which is a state diagram of the target source volume V at time T in an embodiment. As shown in FIG. 3 , the state diagram of the target source volume V at time T includes a write address 31 , a read address 32 , a target source volume 33 (ie, the target source volume V) and each data block 34 in the target source volume V. The read addresses of the target source volume V at time T include 1, 2, 3, and 4, and the write addresses include 1, 2, 3, and 4. A, B, C, and D are stored at addresses 1, 2, 3, and 4, respectively. At this time, the read and write addresses in the volume metadata of the target source volume V correspond to 1, 2, 3, and 4. At this time, a snapshot volume S1 is created for the target source volume V.

In one embodiment, after the snapshot volume S1 is created for the target source volume, the state diagram of the snapshot volume S1 and the target source volume is shown in FIG. 4 (the target source volume is the new source volume V1 at this time). As shown in FIG. 4, after the snapshot volume S1 is created for the target source volume, the state diagram of the snapshot volume S1 and the target source volume includes a snapshot volume 43 and a new source volume 47, wherein the snapshot volume 43 is the above-mentioned snapshot volume S1 , the new source volume 47 is the aforementioned V1. The snapshot volume S1 includes a write address 41 , a read address 42 and each data block 44 . The write address 41 includes 1, 2, 3, and 4, and the read address 42 also includes 1, 2, 3, and 4. The new source volume 47 includes a write address 45 and a read address 46, wherein the write address 45 is assigned as new addresses 5, 6, 7, and 8. Read address 46 includes 1, 2, 3, and 4. It can be seen from FIG. 4 that the reading of the new source volume still reads data from addresses 1, 2, 3 and 4 of the snapshot volume S1. In this application, when the snapshot volume S1 is created, the target source volume V is redirected to the new source volume V1, and the read addresses of the new source volume V1 are the read addresses 1, 2, 3, and 4 of the original target source volume V. The write addresses of the source volume V1 are updated to the new write addresses 5, 6, 7 and 8. The snapshot volume S1 points to the original target source volume V, and the read and write addresses of the snapshot volume are all read and write addresses 1, 2, 3, and 4 of the original target source volume.

Further, after the snapshot volume S1 is created, the reading of the target source volume V becomes the reading of the new source volume V1, which will be read from the snapshot volume S1 according to the read addresses 1, 2, 3 and 4; The writing of volume V becomes the writing to the new source volume V1, which will directly write to the new addresses 5, 6, 7 and 8 according to the new write address, and at the same time update the read address of the corresponding data block in the target cache.

Specifically, it is assumed that when A1 is written to the first data block of the new source volume V1, the status of the snapshot volume S1 and the new source volume is shown in FIG. 5 . As shown in Figure 5, when A1 is written to the first data block of the new source volume V1, the snapshot volume S1 and the new source volume state diagram include the snapshot volume 53 and the new source volume 57, wherein the snapshot volume 53 Corresponding to the snapshot volume S1, the new source volume 47 corresponds to the new source volume V1. The snapshot volume S1 includes a write address 51 , a read address 52 and each data block 54 . The write address 51 includes 1, 2, 3, and 4, and the read address 52 also includes 1, 2, 3, and 4. The new source volume V1 includes a write address 55 , a read address 56 and each data block 58 , wherein the write address 55 is assigned as new addresses 5 , 6 , 7 and 8 . Read address 56 includes 5, 2, 3, and 4, where read address 5 is the updated address. It can be seen from FIG. 4 that when data needs to be read from the unupdated read addresses 2, 3 and 4 in the new source volume, the data is still read from the addresses 2, 3 and 4 of the snapshot volume S1.

In this application, the new source volume writes the data A1 into the first data block according to the write address 5, and at the same time updates the read address of the first data block to 5 in the cache. Further, the updated write address 5 is synchronized to the corresponding data block read address in an asynchronous manner.

This process ensures that writing to the source volume involves only one data write and one update of the read address of the volume metadata in the cache, reducing the write performance loss of the source volume. At the same time, as the data of the source volume is continuously updated and written, the data of the source volume will not have the discrete situation caused when the data of the source volume is written in the ROW snapshot implementation, and thus the problem of reduced read performance will not occur. That is to say, for the new source volume, each time new data is written, the read address of the corresponding data block of the new source volume will be updated, and then the data will be read from the new source volume, and the data will be read from the new source volume itself. It is necessary to read from the snapshot volume, so data is gradually read from the new source volume itself, and there is gradually no discrete situation in which part of the data is read from the new source volume and part of the data is read from the snapshot volume.

In one embodiment, as shown in FIG. 6 , the above method may further include:

S61. Redirect the snapshot volume to the target source volume;

S62. Receive a data read command from the snapshot volume;

S63, read the data corresponding to the target moment from the read address of the target source volume according to the read data instruction of the snapshot volume;

S64. Receive a data write instruction of the snapshot volume;

S65: Write the data to be written in the data write instruction of the snapshot volume into the write address of the target source volume.

In the present application, when a snapshot volume is created, the snapshot volume is redirected to the target source volume. Specifically, the volume name of the snapshot volume is set as the volume name of the target source volume, so that when the candidate searches for the snapshot volume according to the volume name , the target source volume will be found. Further, the read address of the snapshot volume is assigned as the read address of the target source volume, and the write address of the snapshot volume is assigned as the write address of the target source volume.

When receiving a data read command and a write address command to the snapshot volume, data will be read according to the read address of the target source volume and data will be written according to the write address of the target source volume.

In this application, redirection is performed from the perspective of the entire volume, and the volume is used as the redirection unit. Compared with the traditional technology of performing copy-on-write or write-once redirection with a data block as a unit, the number of writes is reduced and the number of writes is improved. write performance.

In one embodiment, as shown in FIG. 7 , the above method may further include:

S71, when receiving the instruction to create snapshot volumes corresponding to multiple moments to the target source volume, create snapshot volumes corresponding to multiple moments for the target source volume;

S72, allocate corresponding identification information, read address and write address to each snapshot volume according to the target source volume;

S73, when receiving a data read instruction to any one of the snapshot volumes, read from the corresponding read address of the corresponding snapshot volume according to the target identifier in the read data instruction to any one of the snapshot volumes Get the corresponding data;

S74. When receiving a data write instruction to any snapshot volume in each snapshot volume, write the corresponding write address to the corresponding write address of the corresponding snapshot volume according to the target identifier in the data write instruction to any snapshot volume in each snapshot volume. data.

In this application, when snapshot volumes corresponding to multiple times need to be created for the target source volume, identification information is allocated to each snapshot volume. The identification information of the snapshot volume and the read address and write address of each snapshot volume. When receiving a data read command of any snapshot volume, extract the identification information of the snapshot volume or the corresponding creation time in the read data command of any snapshot volume, according to the snapshot volume in the read data command of any snapshot volume Find the corresponding snapshot volume according to the identification information or the corresponding creation time, further read the read address of the data as needed, and read the corresponding data from the found snapshot volume.

When receiving a data write command for any snapshot volume, extract the identification information of the snapshot volume or the corresponding creation time in the data write command for any snapshot volume, and extract the snapshot volume in the data write command for any snapshot volume according to the snapshot volume. Find the corresponding snapshot volume according to the identification information or the corresponding creation time, and further write the write address of the data according to the need, and write the corresponding data from the found snapshot volume.

This application supports the creation of multiple snapshot volumes. When multiple snapshot volumes are created, data in the snapshot volumes corresponding to different moments can also be found, which improves the flexibility and application scope of the solution.

In one embodiment, the above-mentioned method may further include:

Asynchronously update the updated read address of the target data block to the new source volume.

In this application, the above-mentioned target source volume and new source volume can be understood as the disk of the computer, and the read and write of the target source volume and the new source volume can be understood as the read and write of the disk. In the present application, after asynchronously updating the read address of the target data block to a new write address in the target cache, the updated read address is also asynchronously updated to the disk after the target source volume is redirected, that is, the above-mentioned new source volume for subsequent reads from the redirected disk.

In one embodiment, the above-mentioned redirecting the target source volume to the new source volume may include:

Modify the volume name of the target source volume to the volume name of the new source volume to redirect the target source volume to the new source volume.

In this application, when creating a snapshot volume, the target source volume is redirected to a new volume to generate a new source volume, the snapshot volume is pointed to the original target source volume, and the volume metadata is updated and loaded when the volume is read and written. When the source volume is read and written, the source volume metadata (including the read address and write address is loaded. When the data is written, it is directly written to the new write address, and the data read address is updated to the new write address to improve the data write performance. The snapshot volume points to the target The read and write addresses of the source volume and the snapshot volume are the read and write addresses of the target source volume.

Specifically, the redirection in this application refers to redirection. The volume name is changed by modifying the volume metadata. When the volume is searched according to the volume name, a new source volume will be found, and the original target source volume has also been redirected and modified. The volume name has become a snapshot volume. Taking the book analogy as an example, it can be understood that the redirection only changes the name of the book (ie, the volume name), but the content of the book (the content of the volume) does not change.

Through this embodiment, the present application can redirect the entire volume as the granularity, which is different from the traditional redirection method by the data block as the granularity. Volume write performance has improved.

In one embodiment, as shown in FIG. 8 , an apparatus for writing data to a source volume during a snapshot process is provided, including: a receiving module 11, a redirecting module 12, an allocating module 13 and a writing module 14, wherein:

A receiving module 11, for receiving an instruction to create a snapshot volume at the target moment of the target source volume;

A redirection module 12, for redirecting the target source volume to a new source volume;

an allocation module 13 for allocating a new write address for each data block of the new source volume;

The writing module 14 is configured to write the data to be written in the write data instruction of the target source volume into the target data block in the new source volume according to the new write address when receiving the write data instruction of the new source volume .

In one of the embodiments, the above-mentioned apparatus further includes a first reading module (not shown in the figure), and the first reading module can preload in the target cache the read addresses of each data block of the new source volume at the target moment and Write address, the read address of each data block of the new source volume at the target time is the read address of each data block of the target source volume at the target time, the write address of each data block of the new source volume is the new write address, receive a new source The read data command of the volume reads the corresponding data from the read address of the new source volume in the target cache.

In one embodiment, the above-mentioned apparatus further includes a first update module (not shown in the figure), and the first update module can update the new source volume in the target cache after the data to be written is written into the target data block. The read address of the target data block is asynchronously updated to the new write address.

In one embodiment, the above-mentioned apparatus further includes a second reading module (not shown in the figure), the second reading module can redirect the snapshot volume to the target source volume, receive a data read instruction of the snapshot volume, and according to the snapshot The read data command of the volume reads the data corresponding to the target time from the read address of the target source volume, receives the write data command of the snapshot volume, and writes the data to be written in the write data command of the snapshot volume to the write address of the target source volume middle.

In one embodiment, the above-mentioned apparatus further includes a creation module (not shown in the figure), and the creation module can create multiple snapshot volumes for the target source volume when receiving an instruction to create snapshot volumes corresponding to multiple times for the target source volume For the snapshot volume corresponding to the time, assign the corresponding identification information, read address and write address to each snapshot volume according to the target source volume. The target identifier in the read data instruction of any snapshot volume reads the corresponding data from the corresponding read address of the corresponding snapshot volume. The target identifier in the data write instruction of any snapshot volume in the snapshot volume writes corresponding data to the corresponding write address of the corresponding snapshot volume.

In one embodiment, the above-mentioned apparatus further includes a second update module (not shown in the figure), the second update module can asynchronously update the updated read address of the target data block to the new source volume.

In one embodiment, the redirection module 12 may modify the volume name of the target source volume to the volume name of the new source volume, so as to redirect the target source volume to the new source volume.

In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the computer program to implement the following steps: receiving a response to a target source volume The instruction to create a snapshot volume at the target moment; redirect the target source volume to the new source volume; assign a new write address to each data block of the new source volume;

When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume into the target data block in the new source volume according to the new write address.

In one embodiment, the processor further implements the following steps when executing the computer program:

Preload the read address and write address of each data block of the new source volume at the target time in the target cache, and the read address of each data block of the new source volume at the target time is the read address of each data block of the target source volume at the target time, The write address of each data block of the new source volume is the new write address;

Receive the read data instruction of the new source volume, and read the corresponding data from the read address of the new source volume in the target cache.

In one embodiment, the processor further implements the following steps when executing the computer program:

After the data to be written is written into the target data block, the read address of the target data block of the new source volume is asynchronously updated to the new write address in the target cache.

In one embodiment, the processor further implements the following steps when executing the computer program:

redirect the snapshot volume to the target source volume;

Receive the read data command of the snapshot volume;

Read the data corresponding to the target moment from the read address of the target source volume according to the read data command of the snapshot volume;

Receive the write data command of the snapshot volume;

Write the data to be written in the data write command of the snapshot volume to the write address of the target source volume.

In one embodiment, the processor further implements the following steps when executing the computer program:

When receiving an instruction to create snapshot volumes corresponding to multiple times for the target source volume, create snapshot volumes corresponding to multiple times for the target source volume;

Assign corresponding identification information, read address and write address to each snapshot volume according to the target source volume;

When receiving a data read command for any snapshot volume among the snapshot volumes, read the corresponding read address from the corresponding read address of the snapshot volume according to the target identifier in the read data command for any snapshot volume among the snapshot volumes The data;

When receiving a data write command to any one of the snapshot volumes, write the corresponding data to the corresponding write address of the corresponding snapshot volume according to the target identifier in the data write command to any one of the snapshot volumes.

In one embodiment, the processor further implements the following steps when executing the computer program:

Asynchronously update the updated read address of the target data block to the new source volume.

In one embodiment, when the processor executes the computer program to implement the above-mentioned steps of redirecting the target source volume to the new source volume, the following steps are specifically implemented:

Modify the volume name of the target source volume to the volume name of the new source volume to redirect the target source volume to the new source volume.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: receiving an instruction to create a snapshot volume at a target moment of a target source volume; The source volume is redirected to the new source volume; a new write address is allocated to each data block of the new source volume; when the write data command of the new source volume is received, the write data of the target source volume is written according to the new write address. The data to be written in the instruction is written to the target data block in the new source volume.

In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

Preload the read address and write address of each data block of the new source volume at the target time in the target cache, and the read address of each data block of the new source volume at the target time is the read address of each data block of the target source volume at the target time, The write address of each data block of the new source volume is the new write address;

Receive the read data instruction of the new source volume, and read the corresponding data from the read address of the new source volume in the target cache.

In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

After the data to be written is written into the target data block, the read address of the target data block of the new source volume is asynchronously updated to the new write address in the target cache.

In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

redirect the snapshot volume to the target source volume;

Receive the read data command of the snapshot volume;

Read the data corresponding to the target moment from the read address of the target source volume according to the read data command of the snapshot volume;

Receive the write data command of the snapshot volume;

Write the data to be written in the data write command of the snapshot volume to the write address of the target source volume.

In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

When receiving an instruction to create snapshot volumes corresponding to multiple times for the target source volume, create snapshot volumes corresponding to multiple times for the target source volume;

Assign corresponding identification information, read address and write address to each snapshot volume according to the target source volume;

When receiving a data read command for any snapshot volume among the snapshot volumes, read the corresponding read address from the corresponding read address of the snapshot volume according to the target identifier in the read data command for any snapshot volume among the snapshot volumes The data;

When receiving a data write command to any one of the snapshot volumes, write the corresponding data to the corresponding write address of the corresponding snapshot volume according to the target identifier in the data write command to any one of the snapshot volumes.

In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

Asynchronously update the updated read address of the target data block to the new source volume.

In one embodiment, when the computer program is executed by the processor to implement the above-mentioned steps of redirecting the target source volume to the new source volume, the following steps are specifically implemented:

Modify the volume name of the target source volume to the volume name of the new source volume to redirect the target source volume to the new source volume.

Those skilled in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium , when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other medium used in the various embodiments provided in this application may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Road (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

The above examples only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

1. A method for writing data to a source volume in a snapshot process, the method comprising: Receive an instruction to create a snapshot volume at the target moment of the target source volume; redirecting the target source volume to a new source volume; allocating a new write address for each data block of the new source volume; When receiving the data write command of the new source volume, write the data to be written in the data write command of the target source volume to the target data in the new source volume according to the new write address piece. 2. The method according to claim 1, wherein the method further comprises: The read address and write address of each data block of the new source volume at the target time are preloaded in the target cache, and the read address of each data block of the new source volume at the target time is the target source volume The read address of each data block at the target moment, the write address of each data block of the new source volume is the new write address; A read data instruction of the new source volume is received, and corresponding data is read from the read address of the new source volume in the target cache. 3. The method according to claim 2, wherein the method further comprises: After the data to be written is written into the target data block, the read address of the target data block of the new source volume is asynchronously updated to the new write address in the target cache. 4. The method of claim 1, wherein the method comprises: redirecting the snapshot volume to the target source volume; receiving a data read instruction of the snapshot volume; Read the data corresponding to the target moment from the read address of the target source volume according to the read data instruction of the snapshot volume; receiving a data write instruction of the snapshot volume; Write the data to be written in the data write instruction of the snapshot volume into the write address of the target source volume. 5. The method according to claim 1, wherein the method further comprises: When receiving an instruction to create snapshot volumes corresponding to multiple moments for the target source volume, create snapshot volumes corresponding to multiple moments for the target source volume; Allocate corresponding identification information, read address and write address to each snapshot volume according to the target source volume; When receiving a data read command for any snapshot volume among the snapshot volumes, read from the corresponding read address of the corresponding snapshot volume according to the target identifier in the read data command for any snapshot volume among the snapshot volumes Get the corresponding data; When receiving a data write instruction to any one of the snapshot volumes, write the corresponding write address to the corresponding write address of the corresponding snapshot volume according to the target identifier in the write instruction to any one of the snapshot volumes. data. 6. The method according to claim 3, wherein the method further comprises: The updated read address of the target data block is asynchronously updated to the new source volume. 7. The method according to claim 1, wherein the redirecting the target source volume to a new source volume comprises: Modifying the volume name of the target source volume to the volume name of the new source volume to redirect the target source volume to the new source volume. 8. An apparatus for writing data to a source volume in a snapshot process, the apparatus comprising: a receiving module, used for receiving an instruction to create a snapshot volume at the target moment of the target source volume; a redirection module for redirecting the target source volume to a new source volume; an allocation module for allocating a new write address for each data block of the new source volume; A writing module, configured to write the data to be written in the write data command of the target source volume into the new source volume according to the new write address when receiving the data write command of the new source volume The target data block in the source volume. 9. A computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any of claims 1 to 7 when the processor executes the computer program. A step of the method. 10. A computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images