CN108958974A - A kind of Snapshot Method, device, system and readable storage medium storing program for executing - Google Patents
A kind of Snapshot Method, device, system and readable storage medium storing program for executing Download PDFInfo
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- CN108958974A CN108958974A CN201810700419.6A CN201810700419A CN108958974A CN 108958974 A CN108958974 A CN 108958974A CN 201810700419 A CN201810700419 A CN 201810700419A CN 108958974 A CN108958974 A CN 108958974A
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- volume
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
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- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The invention discloses a kind of Snapshot Methods, including create snapped volume according to source book, and snapped volume includes whole initial data blocks of source book；The index relative that whenever being modified in source book there are data block, new data block is redirected to last snapped volume, and establishes new data block between the data block modified；When new snapshot point arrives, this snapped volume is determined according to last snapped volume and index relative.It can be seen that, the whole initial data blocks and new data block of source book are stored in same snapped volume by the application, both data can be restored by each snapped volume and its corresponding index relative to past time point, the occupancy to memory space can be reduced again, effectively improve space utilisation.The invention also discloses a kind of fast photographing device, system and readable storage medium storing program for executing, have such as the identical beneficial effect of above-mentioned Snapshot Method.
Description
Technical field
The present invention relates to technical field of data backup, more particularly to a kind of Snapshot Method, device, system and readable storage
Medium.
Background technique
With the arriving of big data era, the business datum of enterprise exponentially increases, due under some cases even
A small amount of loss of data may also bring huge loss, and data safety has become the problem of every profession and trade is paid much attention to.Such as silver
The industries such as row, security, information system have become the important foundation setting of country.In this context, snapping technique meet the tendency of and
It is raw.
Snapshot refers to a completely available copy of specified data acquisition system, which includes corresponding data in some time
The image of point (time point that copy starts).It, even tens seconds can in a few minutes since the snapshot initialization overhead time is very short
To complete the creation of snapshot, therefore snapping technique can shorten backup window.Meanwhile it can also not interrupted using snapping technique
Data backup is carried out in the case where business, therefore, more and more enterprises begin to use snapping technique to guarantee business data
Safety.
It generallys use mirror snapshot in the prior art to carry out data backup, sets initial data by 8 data blocks of A-H
The change of composition, data block A, G occurs after snapshot 0, and the change of B, D occur after snapshot 1, and the change of E, G0 occur
After snapshot 2, the change of H occurs after snapshot 3, the principle of mirror snapshot as shown in Figure 1, when carrying out snapshot every time, on
Modified data block has been copied in snapshot, and the data block that do not modify also has been saved, such as data
Block C and data block F do not change always, but save C and F in each snapshot, it is seen then that it is empty that mirror snapshot will lead to storage
Between largely occupied, waste memory space.
Summary of the invention
The object of the present invention is to provide a kind of Snapshot Method, device, system and readable storage medium storing program for executing, both can be by each
Snapped volume and its corresponding index relative can restore data to past time point, and can reduce and account for memory space
With effectively improving space utilisation.
In order to solve the above technical problems, the present invention provides a kind of Snapshot Methods, comprising:
Snapped volume is created according to source book, the snapped volume includes whole initial data blocks of source book；
Whenever being modified in the source book there are data block, new data block is redirected to last snapped volume, and
Establish the index relative between the new data block and the data block modified；
When new snapshot point arrives, this snapshot is determined according to the snapped volume of the last time and the index relative
Volume.
It is preferably, described that snapped volume is created according to source book, comprising:
Mirrored volume is created for source book, the capacity of the mirrored volume is greater than the capacity of the source book；
The snapped volume is obtained according to the mirrored volume, is then turned off the mirror of the mirrored volume Yu the source book.
Preferably, the capacity of the mirrored volume is not less than 2 times of the capacity of the source book.
Preferably, after establishing the index relative between the new data block and the data block modified, further includes:
The new data is covered to the data block modified in the source book.
Preferably, it after the snapped volume for determining this according to the upper primary snapped volume and the index relative, also wraps
It includes:
By all new data blocks in this snapped volume according to the group of the initial data block in its corresponding described source book
At sequentially resequencing.
In order to solve the above technical problems, the present invention also provides a kind of fast photographic systems, comprising:
Initial creation unit, for creating snapped volume according to source book, the snapped volume includes whole primary datas of source book
Block；
Unit is modified, for whenever being modified in the source book there are data block, new data block to be redirected to upper one
Secondary snapped volume, and establish the index relative between the new data block and the data block modified；
Determination unit, in new snapshot point arrival, according to the snapped volume of the last time and the index relative
Determine this snapped volume.
Preferably, the initial creation unit includes:
Mirrored volume creating unit, for creating mirrored volume for source book, the capacity of the mirrored volume is greater than the appearance of the source book
Amount；
Initial snapshot rolls up creating unit and is then turned off the mirror image for obtaining the snapped volume according to the mirrored volume
The mirror of volume and the source book.
Preferably, further includes:
Sequencing unit, for all new data blocks in the snapped volume by this according to first in its corresponding described source book
The composition sequence of beginning data block is resequenced.
In order to solve the above technical problems, the present invention also provides a kind of fast photographing devices, comprising:
Memory, for storing computer program；
Processor, the step of Snapshot Method as described above is realized when for executing the computer program.
In order to solve the above technical problems, the present invention also provides a kind of readable storage medium storing program for executing, on the readable storage medium storing program for executing
It is stored with computer program, the step of computer program realizes Snapshot Method as described above when being executed by processor.
The present invention provides a kind of Snapshot Methods, including create snapped volume according to source book, and snapped volume includes the whole of source book
Initial data block；Whenever being modified in source book there are data block, new data block is redirected to last snapped volume, and build
Index relative between vertical new data block and the data block modified；When new snapshot point arrives, according to last snapshot
Volume and index relative determine this snapped volume.As it can be seen that the application deposits the whole initial data blocks and new data block of source book
It is placed in same snapped volume, data can both be restored to past by each snapped volume and its corresponding index relative
Time point, and the occupancy to memory space can be reduced, effectively improve space utilisation.
The present invention also provides a kind of fast photographing device, system and readable storage medium storing program for executing, have as above-mentioned Snapshot Method is identical
Beneficial effect.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of schematic diagram of mirror snapshot in the prior art；
Fig. 2 is a kind of flow chart of the process of Snapshot Method provided by the invention；
Fig. 3 is a kind of schematic diagram of snapshot provided by the invention；
Fig. 4 is a kind of structural schematic diagram of fast photographic system provided by the invention.
Specific embodiment
Core of the invention is to provide a kind of Snapshot Method, device, system and readable storage medium storing program for executing, both can be by each
Snapped volume and its corresponding index relative can restore data to past time point, and can reduce and account for memory space
With effectively improving space utilisation.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to figure 2., Fig. 2 is a kind of flow chart of the process of Snapshot Method provided by the invention, this method comprises:
S11: snapped volume is created according to source book, snapped volume includes whole initial data blocks of source book；
New data block: whenever being modified in source book there are data block, being redirected to last snapped volume by S12, and
The index relative that new data block is established between the data block modified；
S13: when new snapshot point arrives, this snapped volume is determined according to last snapped volume and index relative.
In the application, needing to initially set up a snapped volume identical with the data block contents of source book (be can be understood as just
Beginning snapped volume), namely save the complete backup of source book.A snapped volume is created with specific reference to source book, includes source in the snapped volume
Volume whole initial data blocks (whole initial data blocks here in addition to refer to data block content itself, also refer to each data block it
Between sequence).The process only needs to establish once, and there are only new data block need to be written just when data block modification in subsequent source book
After the legacy data block of beginning snapped volume.In addition, it should also be noted that, system can be snapped volume before creating snapped volume
Reserved storage space.
On the basis of including the snapped volume of whole initial data blocks of source book, whenever there are data blocks to be modified in source book
When, new data block is just redirected to last snapped volume, storing due to the data of snapped volume is sequential storage, weight here
Orientation, here substantially can be with it can be appreciated that by behind the legacy data block of the last snapped volume of new data block write-in
It is interpreted as the update to last snapped volume.Assuming that this eight data blocks of original A, B, C ... H in snapped volume, using the application
In redirection mode, when to some data block, for example A data block is modified, then new data block A0 can be sequentially stored in
After H namely snapped volume is updated to A, B, C ... H, A0.In addition it is also necessary to establish new data block between the data block modified
Index relative, such as just need to establish the index relative of A and A0 in above-mentioned example.
Between last snapshot point and new snapshot point, the data block in source book may be modified, in this process, fastly
According to volume can constantly update namely snapped volume in data block identical with the data block in source book behind can be stored in new number
According to block.When new snapshot point arrives, just can according to data block information pointed by last snapshot and index information
It determines data block pointed by this snapshot, and data block pointed by this snapshot is recorded.For example, following example
In, the index according to the index relative between data block information A, B, C ... H and A and A0 pointed by snapshot 0, between G and G0
Relationship can determine that data block information pointed by snapshot 1 is A, B, C ... H, A0, G0.
For convenience of further understanding to this programme, example is set forth below to be illustrated:
Referring to figure 3., Fig. 3 is a kind of schematic diagram of snapshot provided by the invention, here it will again be assumed that original A in snapped volume,
B, this eight data blocks of C ... H, initial snapshot volume is snapshot 0, and application program has modified A and G data block after snapshot 0, in snapshot
It has modified B and D data block after 1, E and G data block is had modified after snapshot 2, H is had modified after snapshot 3, then:
After having modified A and G data block after snapshot 0, new data block A0 and G0 are redirected to last snapped volume by system
(initial snapshot volume), then snapped volume is updated to A, B, C ... H, A0, G0；In addition, establishing the index relative between A and A0, G is established
Index relative between G0；
After having modified B and D data block after snapshot 1, new data block B1 and D1 are redirected to last snapped volume by system,
Then snapped volume is updated to A, B, C ... H, A0, G0, B1, D1；In addition, establishing the index relative between B and B1, establish between D and D1
Index relative；
After having modified E and G data block after snapshot 2, new data block E2 and G2 are redirected to last snapped volume by system,
Then modified snapped volume becomes A, B, C ..., and H, A0, G0, B1, D1, E2, G2 are established in addition, establishing the index relative of E and E2
Index relative between G0 and G2；
After having modified H data block after snapshot 3, new data block H3 is redirected to last snapped volume by system, then is modified
Snapped volume afterwards becomes A, B, C ... H, A0, G0, B1, D1, E2, G2, H3, in addition, establishing the index relative of H and H3.
Shown in sum up, the whole initial data blocks and new data block of source book are stored in same snapped volume in the application
In, multiple snapshot shares the data block in snapped volume, it is not necessary to a snapped volume is all created in creation snapshot every time, it only need to be by source
The data changed in volume are stored into the respective data blocks of snapped volume, and the utilization rate of memory space is improved.In addition, this Shen
Please in save source book in the complete backup put in those years, initial snapshot can also be passed through in the case where source book damage
Volume and index relative restore data to over the state at some time point.
On the basis of the above embodiments:
As a kind of preferred embodiment, snapped volume is created according to source book, comprising:
Mirrored volume is created for source book, the capacity of mirrored volume is greater than the capacity of source book；
The snapped volume is obtained according to mirrored volume, is then turned off the mirror of mirrored volume and source book.
Specifically, the complete backup of source book in order to obtain is first source book creation one before the arrival of first time snapshot point
A mirrored volume carries out data and synchronizes, to save the primary data of source book.In addition, the size of mirrored volume needs to need people according to current
For setting, mirrored volume is bigger, and the snapshot that can be created is more.Require the capacity of mirrored volume to be greater than the capacity of source book here.
After mirrored volume creation, system is that (purpose is to save source book at this to source book creation snapped volume by mirrored volume
The complete backup at moment), then stop mirror image operation, disconnect the mirror between mirrored volume and source book, mirrored volume no longer with
Source book synchronize dynamic change.On this basis, the snapped volume that above-described embodiment is mentioned is actually namely mirrored volume.
It certainly, can also be to establish by other means in addition to establishing snapped volume by the way of in the present embodiment,
The application does not limit particularly herein.
As a kind of preferred embodiment, the capacity of mirrored volume is not less than 2 times of the capacity of source book.
Mentioned above, the capacity of mirrored volume is bigger, can more store more snapshots, in order to guarantee that the data of source book can
It is backed up well, the present embodiment requires the capacity of mirrored volume not less than 2 times of the capacity of source book.Certainly, in order to as far as possible
Ground avoids the waste of memory space, and the capacity of mirrored volume can not be infinitely great, in the capacity for meeting mirrored volume not less than source book
On the basis of 2 times of capacity, the application does not limit the size of the capacity of mirrored volume particularly, comes according to the actual situation
It is fixed.
As a kind of preferred embodiment, after the index relative for establishing new data block between the data block modified, also
Include:
New data is covered to the data block modified in source book.
After index relative between the data block for establishing new data block and being modified, it is also necessary to update new data block
To in the data block modified, complete the modification of the data block of source book, specifically, referring to figure 3. shown in, carrying out 4 times
After data modification, namely after experienced snapshot 4, the final data block of source book becomes A0, B1, C, D1, E2, F, G2, H3.
As a kind of preferred embodiment, in the snapped volume for determining this according to upper primary snapped volume and index relative
Afterwards, further includes:
All new data blocks in this snapped volume are suitable according to the composition of the initial data block in its corresponding source book
Sequence is resequenced.
Specifically, the present embodiment, will also after the snapped volume for determining this according to upper primary snapped volume and index relative
All new data blocks in this snapped volume carry out again according to the composition sequence of the initial data block in its corresponding source book
Sequence.It does so mainly in view of there are ordering relation, bases between the data block in source book and in initial snapshot volume
In this, using new data block is ranked up in the present embodiment facilitate it is subsequent new data is inserted into mirrored volume every time when establish it is new
Index relative between data block and the data block modified.For example, data block A, G is modified after snapshot 0, then obtaining
To after snapshot 1, due in source book data block A before data block G, new data block A0 can be also placed on to new number in snapshot 1
Before block G0.
Referring to figure 4., Fig. 4 is a kind of structural schematic diagram of fast photographic system provided by the invention, which includes:
Initial creation unit 1, for creating snapped volume according to source book, snapped volume includes whole initial data blocks of source book；
Unit 2 is modified, for whenever being modified in source book there are data block, new data block to be redirected to the last time
Snapped volume, and the index relative for establishing new data block between the data block modified；
Determination unit 3, for determining this according to last snapped volume and index relative in new snapshot point arrival
Snapped volume.
As a kind of preferred embodiment, initial creation unit 1 includes:
Mirrored volume creating unit, for creating mirrored volume for source book, the capacity of mirrored volume is greater than the capacity of source book；
Initial snapshot rolls up creating unit and is then turned off mirrored volume and source book for obtaining the snapped volume according to mirrored volume
Mirror.
As a kind of preferred embodiment, further includes:
Sequencing unit, for all new data blocks in the snapped volume by this according to the initial number in its corresponding source book
It resequences according to the composition sequence of block.
Above method embodiment is please referred to for a kind of introduction of fast photographic system provided by the invention, the application does not make herein
It is special to limit.
The present invention also provides a kind of fast photographing devices, comprising:
Memory, for storing computer program；
Processor is realized when for executing computer program such as the step of above-mentioned Snapshot Method.
Above method embodiment is please referred to for a kind of introduction of fast photographing device provided by the invention, the application does not make herein
It is special to limit.
The present invention also provides a kind of readable storage medium storing program for executing, computer program, computer are stored on readable storage medium storing program for executing
It realizes when program is executed by processor such as the step of above-mentioned Snapshot Method.
Above method embodiment is please referred to for a kind of introduction of readable storage medium storing program for executing provided by the invention, the application is herein
It does not limit particularly.
It should be noted that in the present specification, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In the storage medium of any other forms well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of Snapshot Method characterized by comprising
Snapped volume is created according to source book, the snapped volume includes whole initial data blocks of source book；
Whenever being modified in the source book there are data block, new data block is redirected to last snapped volume, and establish
Index relative between the new data block and the data block modified；
When new snapshot point arrives, this snapped volume is determined according to the snapped volume of the last time and the index relative.
2. Snapshot Method as described in claim 1, which is characterized in that described to create snapped volume according to source book, comprising:
Mirrored volume is created for source book, the capacity of the mirrored volume is greater than the capacity of the source book；
The snapped volume is obtained according to the mirrored volume, is then turned off the mirror of the mirrored volume Yu the source book.
3. Snapshot Method as claimed in claim 2, which is characterized in that the capacity of the mirrored volume is not less than the appearance of the source book
2 times of amount.
4. Snapshot Method as described in claim 1, which is characterized in that establish the new data block and the data block modified it
Between index relative after, further includes:
The new data is covered to the data block modified in the source book.
5. Snapshot Method according to any one of claims 1-4, which is characterized in that according to the upper primary snapped volume and
After the index relative determines this snapped volume, further includes:
All new data blocks in this snapped volume are suitable according to the composition of the initial data block in its corresponding described source book
Sequence is resequenced.
6. a kind of fast photographic system characterized by comprising
Initial creation unit, for creating snapped volume according to source book, the snapped volume includes whole initial data blocks of source book；
Unit is modified, for whenever being modified in the source book there are data block, new data block to be redirected to the last time
Snapped volume, and establish the index relative between the new data block and the data block modified；
Determination unit, for being determined according to the snapped volume of the last time and the index relative in new snapshot point arrival
This snapped volume.
7. fast photographic system as claimed in claim 6, which is characterized in that the initial creation unit includes:
Mirrored volume creating unit, for creating mirrored volume for source book, the capacity of the mirrored volume is greater than the capacity of the source book；
Initial snapshot rolls up creating unit, for obtaining the snapped volume according to the mirrored volume, be then turned off the mirrored volume with
The mirror of the source book.
8. fast photographic system as claimed in claims 6 or 7, which is characterized in that further include:
Sequencing unit, for all new data blocks in the snapped volume by this according to the initial number in its corresponding described source book
It resequences according to the composition sequence of block.
9. a kind of fast photographing device characterized by comprising
Memory, for storing computer program；
Processor realizes the step of the Snapshot Method as described in any one of claim 1 to 5 when for executing the computer program
Suddenly.
10. a kind of readable storage medium storing program for executing, which is characterized in that be stored with computer program, the meter on the readable storage medium storing program for executing
It is realized when calculation machine program is executed by processor as described in any one of claim 1 to 5 the step of Snapshot Method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112416860A (en) * | 2020-11-16 | 2021-02-26 | 平安科技（深圳）有限公司 | Data rollback updating method and device, computer equipment and storage medium |
| CN112416860B (en) * | 2020-11-16 | 2024-04-26 | 平安科技（深圳）有限公司 | Data rollback updating method, device, computer equipment and storage medium |
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