CN107526656B - A kind of cloud recovery method and device - Google Patents

Abstract

The embodiment of the present invention discloses a cloud restoration method and device. The method includes determining whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the acquired snapshot version information to be restored; when it is determined that the snapshot version to be restored is the previous snapshot version of the current snapshot version, according to the restoration time in Obtain the target snapshot volume and the corresponding mapping relationship at the corresponding moment in the local storage system; obtain the restoration data from the local storage system according to the target snapshot volume and the mapping relationship, so as to realize the restoration of the snapshot version; wherein, the target snapshot volume is the first snapshot Volume or the second snapshot volume, the first snapshot volume and the second snapshot volume alternately read and write data, and are used to record snapshot information when the local storage system stores in the cloud. The technical solution of the present application avoids acquiring data from the cloud, greatly reducing the time for data acquisition, thereby increasing the rate of cloud restoration, and reducing the cost of cloud download.

Description

A kind of cloud recovery method and device

technical field

Embodiments of the present invention relate to the field of storage technologies, and in particular, to a cloud restoration method and apparatus.

Background technique

With the rapid development of big data and cloud technology, cloud storage technology with mass, security, low cost and high reliability has been applied and developed rapidly.

Cloud storage technology enables users to store data or access data anywhere on the Internet without the need for hardware environments such as power supply, venue, and a large amount of local storage space, saving management costs and making it possible to get what you want. Cloud storage includes cloud backup, cloud cache, cloud mirroring, cloud tiering, etc., among which, cloud backup is to back up local data in the cloud through snapshot technology, so that data can be rolled back to the local if there is an error, so that the data can be continuously available. , to ensure the stability and reliability of the entire system.

In the prior art, during cloud restoration, whether it is the earliest snapshot version or the snapshot of the next newest version, the restoration target snapshot data needs to be directly obtained from the cloud, and then copied to the local original volume. Obtaining data directly from the cloud not only limits the speed of data acquisition due to network bandwidth or cloud download speed, resulting in low recovery speed, but also increases the cost of cloud download.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a cloud restoration method and apparatus, so as to improve the speed of cloud restoration.

In order to solve the above-mentioned technical problems, the embodiments of the present invention provide the following technical solutions:

One aspect of the embodiments of the present invention provides a cloud restoration method, including:

According to the obtained snapshot version information to be restored, determine whether the snapshot version to be restored is the previous snapshot version of the current snapshot version;

When it is determined that the snapshot version to be restored is the last snapshot version of the current snapshot version, obtain the target snapshot volume and the corresponding mapping relationship at the corresponding moment in the local storage system according to the restoration time;

Acquire restoration data from the local storage system according to the target snapshot volume and the mapping relationship, so as to restore the snapshot version;

Wherein, the target snapshot volume is a first snapshot volume or a second snapshot volume, and the local storage system includes a first snapshot volume, a second snapshot volume, a first mapping and a second mapping, which are used to record the local storage system in Snapshot information when the cloud performs storage, the first snapshot volume and the second snapshot volume alternately read and write data, the first mapping is the mapping relationship between the first snapshot volume and the original volume, and the first snapshot volume is the mapping relationship between the first snapshot volume and the original volume. The second mapping is the mapping relationship between the second snapshot volume and the original volume.

Optionally, determining whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the obtained snapshot version information to be restored includes:

According to the acquired restoration time of the snapshot version to be restored and the time of the current snapshot version, it is determined whether the snapshot version to be restored is the last snapshot version of the current snapshot version.

Optionally, determining whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the obtained snapshot version information to be restored includes:

According to the acquired restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version, it is determined whether the snapshot version to be restored is the last snapshot version of the current snapshot version.

Another aspect of the embodiments of the present invention provides a cloud restoration device, including:

The judgment module is used for judging whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the obtained snapshot version information to be restored;

an obtaining module, configured to obtain the target snapshot volume and the corresponding mapping relationship at the corresponding moment in the local storage system according to the restoration time when it is determined that the snapshot version to be restored is the last snapshot version of the current snapshot version; the target snapshot volume It is the first snapshot volume or the second snapshot volume, and the local storage system includes the first snapshot volume, the second snapshot volume, the first mapping and the second mapping, which are used to record the snapshot information when the local storage system stores in the cloud , the first snapshot volume and the second snapshot volume alternately read and write data, the first mapping is the mapping relationship between the first snapshot volume and the original volume, and the second mapping is the second the mapping relationship between the snapshot volume and the original volume;

The restoration module is configured to obtain restoration data from the local storage system according to the target snapshot volume and the mapping relationship, so as to realize restoration of the snapshot version.

Optionally, the judging module is a module for judging whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the obtained restoration time of the snapshot version to be restored and the time of the current snapshot version.

Optionally, the judging module is to judge whether the snapshot version to be restored is the previous snapshot version of the current snapshot version according to the obtained restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version. module.

The embodiment of the present invention provides a cloud restoration method, according to the acquired snapshot version information to be restored, it is judged whether the snapshot version to be restored is the previous snapshot version of the current snapshot version; when it is determined that the snapshot version to be restored is the previous snapshot version of the current snapshot version When the snapshot version is used, the target snapshot volume and the corresponding mapping relationship at the corresponding moment are obtained in the local storage system according to the restoration time; according to the target snapshot volume and the mapping relationship, the restoration data is obtained from the local storage system to realize the restoration of the snapshot version; , the target snapshot volume is the first snapshot volume or the second snapshot volume, and the first snapshot volume and the second snapshot volume alternately perform data reading and writing, and are used to record snapshot information when the local storage system stores in the cloud.

The advantage of the technical solution provided by the present application is that, based on the feature that two mappings and two snapshot volumes work alternately during cloud backup, since the local storage system saves two snapshot volumes, which are the latest and the next time respectively, when the to-be-restored snapshot volume is stored When the snapshot version is the next latest version, that is, the previous version of the current snapshot version, data can be copied directly from the local storage system and restored, avoiding the need to obtain data from the cloud and greatly reducing the time for data acquisition, thereby improving cloud recovery. It also reduces the cost of cloud downloads.

In addition, the embodiment of the present invention also provides a corresponding implementation device for the cloud restoration method, which further makes the method more practical, and the device has corresponding advantages.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic flowchart of a cloud restoration method according to an embodiment of the present invention;

2 is a schematic diagram of establishing a snapshot volume of a local storage system according to an embodiment of the present invention;

3 is a schematic diagram of the principle of a cloud storage snapshot method according to an embodiment of the present invention;

FIG. 4 is a structural diagram of a specific implementation manner of a cloud restoration apparatus provided by an embodiment of the present invention.

Detailed ways

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. in the description and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. . Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or elements is not limited to the listed steps or elements, but may include unlisted steps or elements.

After introducing the technical solutions of the embodiments of the present invention, various non-limiting implementations of the present application are described in detail below.

Referring first to FIG. 1, FIG. 1 is a schematic flowchart of a cloud restoration method provided by an embodiment of the present invention. The embodiment of the present invention may include the following contents:

S101: According to the acquired snapshot version information to be restored, determine whether the snapshot version to be restored is a previous snapshot version of the current snapshot version.

The snapshot version information to be restored may include the time of the snapshot version to be restored and the version number of the snapshot version to be restored. Of course, it may also include other information at the time of the snapshot, which does not affect the implementation of the present application.

According to the obtained restoration time of the snapshot version to be restored and the time of the current snapshot version, it is determined whether the snapshot version to be restored is the previous snapshot version of the current snapshot version.

According to the acquired restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version, it is determined whether the snapshot version to be restored is the previous snapshot version of the current snapshot version.

The last snapshot version volume is the previous snapshot version of the current snapshot version, and the time of the snapshot version to be restored is the time when the snapshot version is snapshotted (ie, the restoration time). For example, the original volume v is at t ₀ , t ₁ , and t respectively. ₂ , t ₃ , t ₄ have taken 4 snapshots, when the fifth snapshot is taken, its last snapshot version is the snapshot corresponding to t ₄ , that is, t ₀ is the last snapshot version of t ₁ , and t ₂ is _t3 is the last snapshot version, _t3 is the last snapshot version of t4 _.

Each snapshot version has a unique identification number. Generally, the generation of the identification number is named according to the sequence of snapshots. Therefore, the snapshot restoration time can be compared with the current version time to determine whether it is the previous version. Of course, it can also be determined by the version For example, the version number of the current snapshot version is v1.2.2, and the version number of the snapshot version to be restored can be v1.2.1, then it can be determined that the snapshot version to be restored is the previous snapshot version of the current snapshot version. This is the next new snapshot.

S102: When it is determined that the snapshot version to be restored is the previous snapshot version of the current snapshot version, obtain the target snapshot volume and the corresponding mapping relationship at the corresponding moment in the local storage system according to the restoration time.

S103: Acquire restoration data from the local storage system according to the target snapshot volume and the mapping relationship, so as to realize restoration of the snapshot version.

The target snapshot volume is the first snapshot volume or the second snapshot volume, and the local storage system includes the first snapshot volume, the second snapshot volume, the first mapping, and the second mapping, which are used to record snapshots when the local storage system stores in the cloud The first snapshot volume and the second snapshot volume alternately read and write data, the first mapping is the mapping relationship between the first snapshot volume and the original volume, and the second mapping is the mapping relationship between the second snapshot volume and the original volume.

The corresponding mapping relationship is the mapping relationship between the target snapshot volume and the original volume. For example, when the target snapshot volume is the first snapshot volume, the corresponding mapping relationship is the first mapping.

When it is detected that the original volume cloud is enabled, that is, when the original volume in the local storage system is converted into a cloud volume, the first snapshot volume, the second snapshot volume, the first mapping, and the second mapping are created in the local storage system in advance. The first mapping is the mapping relationship between the first snapshot volume and the original volume, and the second mapping is the mapping relationship between the second snapshot volume and the original volume, and the mapping can be represented by a bitmap. For example, as shown in Figure 2, the original volume V of the local storage system has four pieces of data. When v is converted into a cloud volume, the local storage system automatically generates two new self-reducing volumes, namely the first snapshot volume FCA and the second snapshot volume FCB , and the mapping fcmapA and fcmapB of the original volume corresponding to the two snapshot volumes.

When the original volume is used for cloud storage, a snapshot operation is required. The first snapshot of the original volume is a full copy, and the second and subsequent times are incremental copies. When a snapshot is taken, the first snapshot volume and the The second snapshot volume, the first mapping and the second mapping work alternately. For example, at t ₀ , the initialized volume FCA, fcmapA is 0000, fcmapB is 1111, and the cloud data at time t ₀ is a full copy of the original volume, from the volume FCA The actual data is read, which block to read from depends on the position of the 1 in fcmapB. From t ₀ to t ₁ , when there is host IO, COW is executed, fcmapA changes the COW block to 1, and the volume FCA records the COW old data. At t ₁ , the initialized volumes FCB and fcmapB are 0000, and fcmapA remains unchanged. At time t1 in the cloud, the data is incremental data from t ₀ to t _1. The data is read from the volume FCB, and which position is read is the position of 1 in fcmapA. At t ₂ , alternately come back, initialize volumes FCA and fcmapA to 0000, and fcmapB remains unchanged. The data at time t ₂ in the cloud is the incremental data from t ₁ to t _2. The data is read from the volume FCA, and which position is read is the position of 1 in fcmapB. And so on.

The two snapshot volumes included in the local storage system are the snapshot version at the latest moment and the snapshot version at the next new moment. Relational reads restore data.

For example, the data of the current snapshot version is read from the volume FCA, and the corresponding target snapshot volume of the next new version is the volume FCB, then the recovery data can be obtained according to the volume FCB and fcmapB.

In the technical solution provided by the embodiment of the present invention, based on the feature that two mappings and two snapshot volumes work alternately during cloud backup, since the local storage system saves two snapshot volumes, which are respectively the latest and the next time, when the backup is to be restored When the snapshot version is the next latest version, that is, the previous version of the current snapshot version, data can be copied directly from the local storage system and restored, avoiding the need to obtain data from the cloud, greatly reducing the time for data acquisition, thereby improving cloud The recovery rate can also reduce the cost of cloud downloads.

In order to make those skilled in the art better understand the technical solutions provided by the application, the application illustrates the technical solutions of the application with specific examples, please refer to FIG. 3 , which may specifically include:

Snapshot g ₁ is created at time t ₀ , fcmapA and FCA are initialized; snapshot g ₂ is created at time t ₁ , fcmapB and FCB are initialized; between t ₁ and t ₂ , host io writes to the first block of original volume v (black in the figure). data block), fcmapB becomes 1000, and the first block in FCB stores the old data of COW. At time _t2 , the data of the original volume v is white, white and black (the color of the data block), and the third cloud snapshot is created, which alternately triggers the initialization of fcmapA to 0000 and the FCA data to be empty. Next, start incrementally copying data to the cloud. Since fcmapB is 1000, the first piece of data needs to be copied to the first piece _of cloud g3. Since fcmapA is 0000, the data is read from the original volume v, that is, the first block of data written by the host between t ₁ and t ₂ , that is, incremental data. After copying to the cloud, g ₃ is set to 3121, indicating that the first piece of data is stored on g ₃ , the second and fourth pieces of data are stored on g ₁ , and the third piece of data is stored on g ₂ .

The latest snapshot data (ie g ₃ ) points to the FCA, and the next new snapshot data (ie g ₂ ) points to the FCB. To restore to g ₂ , FCB and fcmapB can be read locally. Since fcmapB is 1000, the first block of data is read and copied from the FCB to the original volume v, and the other blocks are on the original volume v and do not need to be restored. After restoration, the data of the original volume v is white and white, which is consistent with the data at time t ₁ when g ₂ was created.

This application proposes a fast cloud recovery method based on the alternate working characteristics of two fcmaps and two snapshot volumes in cloud backup. Since two snapshot volumes are stored locally, they are the latest and the next time respectively. If the restoration target snapshot is the second time If it is new, the data is obtained directly from the local for copy and restoration, rather than from the cloud. Improved recovery speed and reduced cloud download costs.

The embodiment of the present invention also provides a corresponding implementation device for the cloud restoration method, which further makes the method more practical. The following describes the cloud restoration apparatus provided by the embodiments of the present invention, and the cloud restoration method apparatus described below and the cloud restoration method described above may refer to each other correspondingly.

Referring to FIG. 4, FIG. 4 is a structural diagram of a cloud restoration apparatus provided in an embodiment of the present invention under a specific implementation manner, and the apparatus may include:

The judgment module 401 is configured to judge whether the snapshot version to be restored is the last snapshot version of the current snapshot version according to the obtained snapshot version information to be restored.

The obtaining module 402 is used to obtain the target snapshot volume and the corresponding mapping relationship at the corresponding moment in the local storage system according to the restoration time when it is determined that the snapshot version to be restored is the previous snapshot version of the current snapshot version; the target snapshot volume is the first A snapshot volume or a second snapshot volume. The local storage system includes a first snapshot volume, a second snapshot volume, a first map, and a second map, which are used to record snapshot information when the local storage system stores in the cloud. The first snapshot volume . The second snapshot volume alternately reads and writes data, the first mapping is the mapping relationship between the first snapshot volume and the original volume, and the second mapping is the mapping relationship between the second snapshot volume and the original volume.

The restoration module 403 is configured to obtain restoration data from the local storage system according to the target snapshot volume and the mapping relationship, so as to realize restoration of the snapshot version.

Optionally, in some implementations of this embodiment, the judging module 401 may determine whether the snapshot version to be restored is an upper version of the current snapshot version according to the obtained restoration time of the snapshot version to be restored and the time of the current snapshot version. A snapshot version of the module.

In some other implementations, the judging module 401 may further determine whether the snapshot version to be restored is the previous snapshot of the current snapshot version according to the obtained restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version version of the module.

The functions of each functional module of the cloud restoration device according to the embodiment of the present invention may be specifically implemented according to the methods in the foregoing method embodiments, and the specific implementation process may refer to the relevant descriptions of the foregoing method embodiments, which will not be repeated here.

As can be seen from the above, the embodiment of the present invention is based on the characteristics of two mappings and two snapshot volumes working alternately during cloud backup. Since the local storage system saves two snapshot volumes, which are the latest and the next latest time respectively, when the snapshot version to be restored is restored. When it is the next version, that is, the previous version of the current snapshot version, data can be copied directly from the local storage system and restored, avoiding the need to obtain data from the cloud, greatly reducing the time for data acquisition, thereby improving the speed of cloud restoration. , but also reduces the cost of cloud downloads.

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

Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. The software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.

The cloud restoration method and device provided by the present invention are described above in detail. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (6)

1. A cloud restoration method, comprising:

judging whether the snapshot version to be restored is the previous snapshot version of the current snapshot version or not according to the acquired snapshot version information to be restored;

when the snapshot version to be restored is judged to be the last snapshot version of the current snapshot version, acquiring a target snapshot volume and a corresponding mapping relation at the corresponding moment in a local storage system according to the restoration time;

according to the mapping relation between the target snapshot volume and the target snapshot volume, recovery data is obtained from the local storage system, so that recovery of a snapshot version is achieved;

the target snapshot volume is a first snapshot volume or a second snapshot volume, the local storage system comprises a first snapshot volume, a second snapshot volume, a first mapping and a second mapping, and is used for recording snapshot information of the local storage system during storage in a cloud, the first snapshot volume and the second snapshot volume alternately read and write data, the first mapping is a mapping relation between the first snapshot volume and an original volume, and the second mapping is a mapping relation between the second snapshot volume and the original volume; the first snapshot volume and the second snapshot volume are respectively a snapshot version at the latest moment and a snapshot version at the next latest moment; the alternating reading and writing of data by the first snapshot volume and the second snapshot volume comprises:

the primary volume carries out the first snapshot and is a full copy, and each time from the second snapshot to the later is an incremental copy; the mapping of two snapshot volumes corresponding to the original volume is fcmapA and fcmapB, and the mapping is expressed by a bitmap;

at t0, initializing volumes FCA, fcmapA to 0000, fcmapB to 1111, and reading actual data from the volumes FCA, wherein the data at the cloud time t0 is full copy of the original volumes; executing COW when a host IO exists between t0 and t1, wherein the fcapa changes a COW block into 1, and the volume FCA records old COW data; at t1, initializing a volume FCB, wherein fcmapB is 0000, fcmapA is unchanged, data at the cloud time t1 is incremental data from t0 to t1, and the data is read from the volume FCB; at t2, the process alternates back to initialize the volume FCA, the fcmapA is 0000, and the fcmapB is unchanged.

2. The cloud restoration method according to claim 1, wherein the determining, according to the obtained to-be-restored snapshot version information, whether the to-be-restored snapshot version is a previous snapshot version of the current snapshot version includes:

and judging whether the snapshot version to be restored is the previous snapshot version of the current snapshot version or not according to the restoration time of the acquired snapshot version to be restored and the time of the current snapshot version.

3. The cloud restoration method according to claim 1, wherein the determining, according to the obtained to-be-restored snapshot version information, whether the to-be-restored snapshot version is a previous snapshot version of the current snapshot version includes:

and judging whether the snapshot version to be restored is the last snapshot version of the current snapshot version or not according to the acquired restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version.

4. A cloud restoration device, comprising:

the judging module is used for judging whether the snapshot version to be restored is the previous snapshot version of the current snapshot version or not according to the acquired snapshot version to be restored information;

the acquisition module is used for acquiring a target snapshot volume and a corresponding mapping relation at a corresponding moment in the local storage system according to the restoration time when the snapshot version to be restored is judged to be the previous snapshot version of the current snapshot version; the target snapshot volume is a first snapshot volume or a second snapshot volume, the local storage system comprises a first snapshot volume, a second snapshot volume, a first mapping and a second mapping, and is used for recording snapshot information when the local storage system stores in a cloud, the first snapshot volume and the second snapshot volume alternately read and write data, the first mapping is a mapping relation between the first snapshot volume and an original volume, and the second mapping is a mapping relation between the second snapshot volume and the original volume; the first snapshot volume and the second snapshot volume are respectively a snapshot version at the latest moment and a snapshot version at the next latest moment; the alternating reading and writing of data by the first snapshot volume and the second snapshot volume comprises:

the primary volume carries out the first snapshot and is a full copy, and each time from the second snapshot to the later is an incremental copy; the mapping of two snapshot volumes corresponding to the original volume is fcmapA and fcmapB, and the mapping is expressed by a bitmap;

at t0, initializing volumes FCA, fcmapA to 0000, fcmapB to 1111, and reading actual data from the volumes FCA, wherein the data at the cloud time t0 is full copy of the original volumes; executing COW when a host IO exists between t0 and t1, wherein the fcapa changes a COW block into 1, and the volume FCA records old COW data; at t1, initializing a volume FCB, wherein fcmapB is 0000, fcmapA is unchanged, data at the cloud time t1 is incremental data from t0 to t1, and the data is read from the volume FCB; t2, alternately returning, initializing the volume FCA, the fcmapA to 0000, and the fcmapB to be unchanged;

and the restoration module is used for acquiring restoration data from the local storage system according to the mapping relation between the target snapshot volume and the target snapshot volume so as to realize restoration of the snapshot version.

5. The cloud restoration device according to claim 4, wherein the determining module is a module that determines whether the snapshot version to be restored is a previous snapshot version of the current snapshot version according to the acquired restoration time of the snapshot version to be restored and the time of the current snapshot version.

6. The cloud restoration device according to claim 4, wherein the determining module is a module that determines whether the snapshot version to be restored is a previous snapshot version of the current snapshot version according to the acquired restoration version identification number of the snapshot version to be restored and the version identification number of the current snapshot version.

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