CN107577798B - Snapshot creating method and device and computer readable storage medium - Google Patents
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Abstract
The invention discloses a snapshot creating method, which obtains snapshot task information by inquiring a prestored snapshot task configuration file; and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode. Therefore, the snapshot task is automatically executed through the acquired task information of the snapshot task, so that the automatic snapshot creation is realized, a large amount of labor cost is saved, the snapshot creation efficiency and stability are high, and the automatic disaster recovery backup of the storage system is realized. In addition, the invention also discloses a snapshot creating device and a computer readable storage medium, which also have the beneficial effects.
Description
Technical Field
The present invention relates to the field of snapshot technologies, and in particular, to a snapshot creation method, an apparatus, and a computer-readable storage medium.
Background
In the cloud computing era, the importance of disaster recovery backup of mass data is also increasing. Due to the advantages of fast snapshot execution time, small disk space occupation and the like, snapshots gradually become an important means for disaster recovery backup.
Disaster recovery backup in a storage system can be implemented by snapshotting a volume. However, it is now common for users to manually create snapshots for volumes for disaster recovery backup purposes. For example, for a certain volume needing backup, in order to ensure the effect and stability of disaster recovery backup, snapshots need to be created for the volume continuously, or one snapshot needs to be created at intervals. Under the condition of manually creating the snapshot, a large amount of labor cost is required to be invested in order to ensure the backup effect, the efficiency is low, and the snapshot is unstable.
Therefore, how to reduce the disaster recovery backup cost of the storage system, improve the efficiency and ensure the stability is a problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a snapshot creating method, a snapshot creating device and a computer readable storage medium, which aim to solve the problems of higher disaster recovery backup cost, lower efficiency and lower stability of the existing storage system.
In order to solve the technical problems, the invention provides the following technical scheme:
a snapshot creating method is applied to a storage system and comprises the following steps:
inquiring a pre-stored snapshot task configuration file, and acquiring snapshot task information;
and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode.
Optionally, the querying a pre-stored snapshot task configuration file to obtain snapshot task information includes:
and inquiring the snapshot task configuration file prestored in the database every preset period to obtain the snapshot task information.
Optionally, the executing the snapshot task according to the snapshot task information and creating the snapshot by using a preset mode includes:
judging whether the snapshot task is in an open state or not according to the snapshot task information;
when the snapshot task is in the starting state, judging whether the current time is equal to the preset execution time of the snapshot task;
when the current time is equal to the preset execution time, inquiring a snapshot instance table to obtain the number of snapshot instances of a snapshot target object;
judging whether the number of snapshot instances of the snapshot target object is greater than a preset threshold value or not;
when the number of the snapshot instances is smaller than the preset threshold value, executing the snapshot task, and creating the snapshot by using the preset mode;
and when the number of the snapshot instances is greater than or equal to the preset threshold value, deleting the snapshot instances meeting the preset deletion condition, executing the snapshot task, and creating the snapshot by using the preset mode.
Optionally, the preset mode is a call command line interface command.
Optionally, after creating the snapshot by using the preset method, the method further includes:
and recording the information of the snapshot to a snapshot task table and the snapshot instance table.
A snapshot creating device applied to a storage system comprises:
the snapshot task information acquisition module is used for inquiring a pre-stored snapshot task configuration file and acquiring snapshot task information;
and the snapshot creating module is used for executing the snapshot task according to the snapshot task information and creating the snapshot by using a preset mode.
Optionally, the snapshot task information obtaining module includes:
and the periodic query obtaining sub-module is used for querying the snapshot task configuration file prestored in the database every other preset period to obtain the snapshot task information.
Optionally, the snapshot creating module includes:
the first judgment submodule is used for judging whether the snapshot task is in an open state or not according to the snapshot task information;
the second judging submodule is used for judging whether the current time is equal to the preset execution time of the snapshot task or not when the snapshot task is in the starting state;
a snapshot instance number query submodule, configured to query a snapshot instance table when the current time is equal to the preset execution time, and obtain the number of snapshot instances of a snapshot target object;
the third judgment submodule is used for judging whether the number of the snapshot instances of the snapshot target object is greater than a preset threshold value or not;
the creating submodule is used for executing the snapshot task and creating the snapshot by utilizing the preset mode when the number of the snapshot instances is smaller than the preset threshold value;
and the deletion creation sub-module is used for deleting the snapshot instances meeting the preset deletion condition when the number of the snapshot instances is greater than or equal to the preset threshold value, executing the snapshot task and creating the snapshots by utilizing the preset mode.
Optionally, the method further comprises:
and the snapshot information recording module is used for recording the information of the snapshot to a snapshot task table and the snapshot instance table.
A computer-readable storage medium having stored thereon a snapshot creation program which, when executed by a processor, implements the steps of the snapshot creation method as in any one of the above.
According to the snapshot creating method, the snapshot creating device and the computer readable storage medium, the snapshot task information is obtained by inquiring the pre-stored snapshot task configuration file; and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode. Therefore, the snapshot task is automatically executed through the acquired task information of the snapshot task, so that the automatic snapshot creation is realized, a large amount of labor cost is saved, the snapshot creation efficiency and stability are high, and the automatic disaster recovery backup of the storage system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of a specific implementation manner of a snapshot creation method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another specific implementation of a snapshot creation method according to an embodiment of the present invention;
fig. 3 is a block diagram schematically illustrating a structure of a snapshot creating apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a specific implementation manner of a snapshot creating method according to an embodiment of the present invention. The method can be particularly applied to a storage system and comprises the following steps:
step 101: and inquiring a pre-stored snapshot task configuration file to obtain snapshot task information.
It should be noted that the snapshot task configuration file may be a pre-configured and persistent file, which may be embodied as a snapshot task table. The snapshot task table may be stored in a database, and by querying the snapshot task table, the relevant information of the snapshot task may be obtained.
The snapshot task configuration file can be generated according to a configuration instruction, the configuration instruction can be generated according to configuration operation of a user, and snapshot task information of a plurality of sets of storage devices can be stored in each snapshot task configuration file. For example, the snapshot software interacts with the storage system end through the SSH protocol to access multiple sets of storage devices, and a user can configure mutually independent snapshot tasks for each set of storage device through a human-computer interaction interface provided by the snapshot software. Of course, the configuration instructions may also be automatically generated by the system.
The snapshot task information may include, but is not limited to, a snapshot execution time, a snapshot type, a snapshot target object, a snapshot state, and the like, which may be characterized as which volume is to be snapshot, when to be snapshot, which type of snapshot is to be taken, and the like.
Step 102: and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode.
It should be noted that the preset manner may specifically be a Command Line Interface (CLI) call, that is, creating the snapshot by calling a CLI Command. Of course, other ways of creating snapshots may also be utilized and are not limited herein.
According to the snapshot task information, which volume snapshot is, which type of snapshot is created can be directly determined, and then the snapshot task is directly executed, and the snapshot is created, and the executed snapshot task can be a timing snapshot task, at this time, the snapshot task information should include an interval period configured in advance by a user or a system, that is, the timing snapshot task is in a snapshot task table; the snapshot task may be performed occasionally, and at this time, the snapshot may be created without interruption in order to ensure the continuity of the snapshot.
Furthermore, in order to better improve the performance, the process of executing the snapshot task may include the judgment of the state of the snapshot task, the judgment of the execution time, the judgment of whether the number of snapshot instances is greater than the preset threshold value, and the like, according to the snapshot task information.
The snapshot task state may be specifically an open state, a pause state, and the like, and by determining whether the snapshot task state is an open state, if so, the snapshot task may be executed, and if not, the snapshot task may not be executed. In this way, the suspension and the recovery of the snapshot task can be realized, and specifically, the execution of the snapshot task currently being executed can be stopped by setting the state of the snapshot in the open state as suspension; the snapshot task whose execution has been stopped may be re-executed by setting the state of the snapshot in the suspended state to on.
The judgment of the snapshot execution time refers to judging whether the preset execution time of the periodical snapshot task is equal to the current time, that is, the execution time of the snapshot task can be set, and when the execution time is reached and other conditions are met, the snapshot task is executed.
The judgment of whether the number of snapshot instances is greater than the preset threshold mainly considers that snapshot data has an upper number limit, that is, the number of snapshot instances created by each volume cannot exceed the upper number limit or the preset number threshold (the preset number threshold should also be less than or equal to the upper number limit), if not, a snapshot can be created, and if so, one or more snapshot instances can be selected to be deleted, so as to ensure the stability of the system. Generally, the upper limit of the number is 255, that is, the number of snapshots corresponding to each volume or snapshot target object cannot exceed 255, and if the number of snapshots exceeds 255, a bug occurs, which affects the normal operation of the system. Therefore, by judging whether the number of the snapshot instances is larger than the preset threshold or the upper limit of the number of the snapshots, the system can be prevented from bugs.
According to the snapshot task information, when the snapshot task is executed, the above judgments are executed, so that the performance of creating the snapshot can be further improved. However, it is understood that the object of the embodiment of the present invention can be achieved by directly executing the snapshot task without performing several determinations described above.
In this embodiment, snapshot task information is obtained by querying a pre-stored snapshot task configuration file; and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode. Therefore, the snapshot task is automatically executed through the acquired task information of the snapshot task, so that the automatic snapshot creation is realized, a large amount of labor cost is saved, the snapshot creation efficiency and stability are high, and the automatic disaster recovery backup of the storage system is realized.
In order to further improve the efficiency and effect of creating the snapshot and better implement the automatic disaster recovery backup, preferably, the effect of the automatic disaster recovery backup can be further improved by configuring the timed snapshot task, executing the snapshot task at a fixed time, judging the state of the snapshot task, judging whether the execution time is the current time, and judging the number of the snapshot instances.
Referring to fig. 2, a flow diagram of another embodiment of a snapshot creation method is shown, which may include the following steps:
step 201: and inquiring a snapshot task configuration file prestored in a database every preset period to obtain snapshot task information.
It is understood that the preset period may be set according to actual requirements, application scenarios, and the like, for example, half an hour, a day, and the like. Specifically, the execution of the timed snapshot task may be triggered by a timer, and at this time, the set preset period should be smaller than the minimum trigger unit of the timer, and generally, the minimum trigger unit of the timer is half an hour, and the preset period should be greater than or equal to half an hour.
When the snapshot task configuration file is specifically a snapshot task table, the information of the relevant snapshot task can be acquired by regularly querying the snapshot task table.
Step 202: and judging whether the snapshot task is in an open state or not according to the snapshot task information.
Specifically, a record of a query snapshot task table may be obtained to determine the state of the snapshot task. When the state of the snapshot task needs to be changed, namely the snapshot task needs to be started or suspended, a user or a system can input a corresponding change instruction through human-computer interaction, and after the change is carried out according to the change instruction, the state of the snapshot task can be recorded in a snapshot task table, so that whether the snapshot task is in the starting state or not can be known by inquiring the snapshot task table.
When the snapshot task is in the open state, it indicates that the snapshot task can be executed, and since the snapshot task is a timing snapshot task, it is further necessary to determine whether the execution time of the snapshot task is equal to the current time.
When the snapshot task is not in the open state, the method returns to step 201 to continue querying other snapshot tasks in the snapshot task table.
Step 203: and when the snapshot task is in an open state, judging whether the current time is equal to the preset execution time of the snapshot task.
When the preset execution time is equal to the current time, further judging the number of snapshot instances of the snapshot target object; and when the preset execution time is not equal to the current time, returning to the step 201, and continuously querying other snapshot tasks in the snapshot task table.
Step 204: and if the current time is equal to the preset execution time, inquiring the snapshot instance table to obtain the number of the snapshot instances of the snapshot target object.
It is to be understood that the snapshot target object refers to a target object corresponding to the snapshot task. For example, volume a needs to be snapshot, and volume a is the snapshot target object. The number of snapshot instances of the snapshot target object refers to the number of snapshots that have been created by the target object, for example, if the number of snapshots that have been created before volume a is 100, the number of snapshot instances of volume a is 100.
When the snapshot instance table is queried to obtain the number of snapshot instances, it may be determined whether each snapshot exists first, and the record of the nonexistent snapshot instance is deleted, so that the recorded information is consistent with the snapshot that actually exists. After judging whether the snapshot instances exist, the size of the number of the snapshot instances can be further judged.
Step 205: and judging whether the number of snapshot instances of the snapshot target object is greater than a preset threshold value. And when the number of the snapshot instances is smaller than the preset threshold, entering step 206, otherwise, entering step 207.
It is to be understood that the preset threshold may be set according to the requirement, but the preset threshold should be less than or equal to the upper limit of the number of snapshot instances. Generally, the upper limit of the number of snapshots is 255.
Step 206: and executing a snapshot task, and creating a snapshot by using a preset mode.
If less than the preset threshold or number upper limit, the snapshot may be created directly by invoking the CLI command.
Step 207: and deleting the snapshot instance meeting the preset deletion condition, executing the snapshot task, and creating the snapshot by using a preset mode.
And if the current value is equal to or greater than the preset threshold value, deleting the snapshot instance meeting the preset deleting condition. The preset deletion condition may be embodied as a longest snapshot or a snapshot created before a certain time, for example, a snapshot instance with the longest snapshot time may be deleted, or all snapshots before 3 days may be deleted.
After the snapshot is deleted, the number of the snapshot instances is smaller than a preset threshold or an upper limit of the number, and the bug cannot appear when the snapshot is created. At this point, a snapshot task may be performed, creating a snapshot.
After the snapshot is created, the created snapshot information may be recorded for facilitating subsequent queries.
Step 208: and recording the information of the snapshot into a snapshot task table and a snapshot instance table.
Specifically, relevant information such as the execution time of the snapshot task in the timing snapshot task table is updated, and a corresponding record is added to the snapshot instance table.
In this embodiment, the snapshot is periodically created by executing the timing snapshot task, so as to better implement automatic disaster recovery backup. And when the snapshot task is executed, the state of the snapshot task is set, and the functions of suspending and recovering the snapshot task are realized. And judging whether the number of the snapshot instances is greater than the maximum preset threshold value or not, so that the stable operation of the system can be ensured.
In the following, the snapshot creating apparatus provided in the embodiment of the present invention is introduced, and the snapshot creating apparatus described below and the snapshot creating method described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a schematic block diagram of a structure of a snapshot creating apparatus according to an embodiment of the present invention, where the apparatus may specifically apply to a storage system, and the apparatus may include the following modules:
a snapshot task information obtaining module 31, configured to query a pre-stored snapshot task configuration file, and obtain snapshot task information;
and the snapshot creating module 32 is configured to execute a snapshot task according to the snapshot task information, and create a snapshot in a preset manner.
In some embodiments, the snapshot task information obtaining module may include:
and the regular query acquisition submodule is used for querying the snapshot task configuration file prestored in the database every other preset period to acquire snapshot task information.
In some embodiments, the snapshot creation module may include:
the first judgment submodule is used for judging whether the snapshot task is in an open state or not according to the snapshot task information;
the second judging submodule is used for judging whether the current time is equal to the preset execution time of the snapshot task or not when the snapshot task is in an open state;
the snapshot instance number query submodule is used for querying the snapshot instance table when the current time is equal to the preset execution time, and obtaining the snapshot instance number of the snapshot target object;
the third judgment submodule is used for judging whether the number of the snapshot instances of the snapshot target object is greater than a preset threshold value or not;
the creating submodule is used for executing a snapshot task and creating a snapshot by using a preset mode when the number of snapshot instances is smaller than a preset threshold value;
and the deletion creating submodule is used for deleting the snapshot instances meeting the preset deletion condition when the number of the snapshot instances is greater than or equal to the preset threshold value, executing the snapshot task and creating the snapshot by using a preset mode.
In some embodiments, the apparatus may further comprise:
and the snapshot information recording module is used for recording the information of the snapshot to the snapshot task table and the snapshot instance table.
In this embodiment, snapshot task information is obtained by querying a pre-stored snapshot task configuration file; and executing the snapshot task according to the snapshot task information, and creating the snapshot by using a preset mode. Therefore, the snapshot task is automatically executed through the acquired task information of the snapshot task, so that the automatic snapshot creation is realized, a large amount of labor cost is saved, the snapshot creation efficiency and stability are high, and the automatic disaster recovery backup of the storage system is realized.
The present embodiment provides a computer-readable storage medium, which stores a snapshot creating program, and when the snapshot creating program is executed by a processor, the snapshot creating program implements the steps of the snapshot creating method according to any one of the above. The similarities between this embodiment and the above embodiments can be referred to each other, and are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The snapshot creating method, the snapshot creating device and the computer-readable storage medium provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A snapshot creating method is applied to a storage system and is characterized by comprising the following steps:
inquiring a pre-stored snapshot task configuration file, and acquiring snapshot task information;
executing a snapshot task according to the snapshot task information, and creating a snapshot by using a preset mode;
the executing the snapshot task according to the snapshot task information and creating the snapshot by using a preset mode comprises the following steps:
judging whether the snapshot task is in an open state or not according to the snapshot task information;
when the snapshot task is in the starting state, judging whether the current time is equal to the preset execution time of the snapshot task;
when the current time is equal to the preset execution time, inquiring a snapshot instance table to obtain the number of snapshot instances of a snapshot target object;
judging whether the number of snapshot instances of the snapshot target object is greater than a preset threshold value or not;
when the number of the snapshot instances is smaller than the preset threshold value, executing the snapshot task, and creating the snapshot by using the preset mode;
and when the number of the snapshot instances is greater than or equal to the preset threshold value, deleting the snapshot instances meeting the preset deletion condition, executing the snapshot task, and creating the snapshot by using the preset mode.
2. The method of claim 1, wherein the querying a pre-stored snapshot task configuration file to obtain snapshot task information comprises:
and inquiring the snapshot task configuration file prestored in the database every preset period to obtain the snapshot task information.
3. The method of claim 1, wherein the predetermined manner is to invoke a command line interface command.
4. The method of claim 1, wherein after creating the snapshot using the predetermined manner, further comprising:
and recording the information of the snapshot to a snapshot task table and the snapshot instance table.
5. A snapshot creation apparatus applied to a storage system, comprising:
the snapshot task information acquisition module is used for inquiring a pre-stored snapshot task configuration file and acquiring snapshot task information;
the snapshot creating module is used for executing a snapshot task according to the snapshot task information and creating a snapshot by using a preset mode;
the snapshot creation module comprises:
the first judgment submodule is used for judging whether the snapshot task is in an open state or not according to the snapshot task information;
the second judging submodule is used for judging whether the current time is equal to the preset execution time of the snapshot task or not when the snapshot task is in the starting state;
a snapshot instance number query submodule, configured to query a snapshot instance table when the current time is equal to the preset execution time, and obtain the number of snapshot instances of a snapshot target object;
the third judgment submodule is used for judging whether the number of the snapshot instances of the snapshot target object is greater than a preset threshold value or not;
the creating submodule is used for executing the snapshot task and creating the snapshot by utilizing the preset mode when the number of the snapshot instances is smaller than the preset threshold value;
and the deletion creation sub-module is used for deleting the snapshot instances meeting the preset deletion condition when the number of the snapshot instances is greater than or equal to the preset threshold value, executing the snapshot task and creating the snapshots by utilizing the preset mode.
6. The apparatus of claim 5, wherein the snapshot task information obtaining module comprises:
and the periodic query obtaining sub-module is used for querying the snapshot task configuration file prestored in the database every other preset period to obtain the snapshot task information.
7. The apparatus of claim 5, further comprising:
and the snapshot information recording module is used for recording the information of the snapshot to a snapshot task table and the snapshot instance table.
8. A computer-readable storage medium, characterized in that a snapshot creation program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the snapshot creation method according to any one of claims 1 to 4.
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| EP3036636A4 (en) * | 2013-08-19 | 2017-06-21 | Microsoft Technology Licensing, LLC | Snapshotting executing code with a modifiable snapshot definition |
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