CN100478904C - Method and device for protecting snapshot - Google Patents

Method and device for protecting snapshot Download PDF

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CN100478904C
CN100478904C CNB2007101303637A CN200710130363A CN100478904C CN 100478904 C CN100478904 C CN 100478904C CN B2007101303637 A CNB2007101303637 A CN B2007101303637A CN 200710130363 A CN200710130363 A CN 200710130363A CN 100478904 C CN100478904 C CN 100478904C
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snapshot
copy
indication
data
mapping table
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CN101093459A (en
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周升
张鹏
张国彬
欧阳戟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2008/071345 priority patent/WO2009009979A1/en
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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
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1435—Saving, restoring, recovering or retrying at system level using file system or storage system metadata
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/84—Using snapshots, i.e. a logical point-in-time copy of the data

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  • Theoretical Computer Science (AREA)
  • Library & Information Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

A method for protecting snapshot sets up snapshot copy for snapshot and then executes operation separately on snapshot and snapshot copy. The protection device used for realizing said method is also disclosed.

Description

Snapshot guard method and device
Technical field
The present invention relates to the data protection technical field, be specifically related to a kind of snapshot guard method and device.
Background technology
Along with the widespread use of information science technology and constantly development, the data volume rapid growth, it is more and more important that data protection also becomes.For can be under the prerequisite of not interrupting host service, the data object that generates service application fast at a time between the copy of point, and take less storage space, proposed the virtual snapshot technology sometime application data in the service operation backed up.In this article, will produce volume for service application provides the volume of data storage and addressing space to be called.Behind the snapshot creation, can carry out simultaneously with the visit that production is rolled up, when the production volume wishes to return to the data of snapshot time point, can roll up the rollback of execution snapshot, ensure the reliability and the integrality of data to a certain extent production to the visit of snapshot.
The conventional method of existing virtual snapshot technology is described below:
1, when creating snapshot, generates a mapping table, the deposit position of the real data of indication snapshot.Obviously, snapshot creation is initial, and the address pointer in its mapping table all points to be produced in the volume.An example of this process as shown in Figure 1, snapshot is produced certain data A, B, C, D constantly of volume by mapping table indication, this moment, snapshot data was shared the data space of producing volume.
2, in the time will making an amendment to the production volume, will change the resource volume that partial data copies to snapshot earlier, and revise the mapping table of snapshot, make relevant position in the pointed resource volume, make an amendment producing volume then, this method is called writes preceding copy (COW:Copy-On-Write).Based on an example of this process of Fig. 1 as shown in Figure 2, when main frame need be written as " E " with the data " D " in the production volume, earlier " D " copied to the resource volume of snapshot, and then " D " that will produce in the volume is revised as " E ", and the mapping table of modification snapshot, make relevant position in the pointed resource volume corresponding with data " D ".Certainly,, then can directly carry out, no longer write preceding copy if make amendment once more to having done the part of writing preceding copy.
As seen from the above, virtual snapshot has been set up the logic copy that a creation-time point go up to be produced the volume data, snapshot data with produce the volume data shared amount of physical memory of trying one's best.When reading snapshot, according to the map information in the mapping table of snapshot, corresponding position reading of data in the resource volume of producing volume or snapshot; When writing snapshot,,, then data are covered and write relevant position in the resource volume according to pointer if the part that writes has been pointed in the resource volume of snapshot according to the map information in the mapping table; Produce in the volume if the part that writes is still pointed to, then data are write in the resource volume, and revise mapping table, make relevant position in the pointed resource volume.
In proposing process of the present invention, the present inventor finds that there is following defective at least in above-mentioned virtual snapshot technology: can't provide protection to snapshot data, in case user's modification snapshot data, produce the data that volume can't return to initial snapshot time point; And be unfavorable for satisfying the requirement of some application scenario, for example, many applied host machines are handled requirement of certain time point snapshot data etc. simultaneously.
Summary of the invention
The embodiment of the invention provides a kind of snapshot guard method that protection can be provided snapshot data, comprising: obtain the indication to the first snapshot creation snapshot copy; According to the indication of described establishment snapshot copy, create the copy of first snapshot; Obtain operation indication to the copy of first snapshot and/or first snapshot; According to described operation indication, the copy of first snapshot and/or first snapshot is carried out corresponding operation.
The embodiment of the invention also provides corresponding snapshot protective device, comprising: the protection trigger element is used to obtain the indication to the first snapshot creation snapshot copy; The copy creating unit is used for the indication according to described establishment snapshot copy, creates the copy of first snapshot; The operation trigger element is used to obtain the operation indication to the copy of first snapshot and/or first snapshot; Operation execution unit is used for according to described operation indication the copy of first snapshot and/or first snapshot being carried out corresponding operation.
The embodiment of the invention adopts snapshot creation snapshot copy, respectively to the method for snapshot and snapshot copy executable operations; Owing to adopt the snapshot copy that snapshot data is backed up, even make and revised snapshot data, also can recover the data of snapshot time point by the snapshot copy, provide effective protection to snapshot; Simultaneously,, can satisfy parallel work-flow requirement, for example, can satisfy many applied host machines and handle requirement of certain time point snapshot data etc. simultaneously same time point snapshot data based on some copies of snapshot and snapshot.
Description of drawings
Fig. 1 is that existing virtual snapshot is created synoptic diagram;
Fig. 2 is a copy function synoptic diagram before existing virtual snapshot is write;
Fig. 3 is the embodiment of the invention one a snapshot guard method schematic flow sheet;
Fig. 4 creates snapshot copy synoptic diagram by copying data in the embodiment of the invention one;
Fig. 5 is the embodiment of the invention two snapshot guard method schematic flow sheets;
Fig. 6 creates snapshot copy synoptic diagram by duplicating mapping table in the embodiment of the invention two;
Fig. 7 is a copy synoptic diagram before snapshot and snapshot copy are write in the embodiment of the invention two;
Fig. 8 writes the snapshot synoptic diagram in the embodiment of the invention two;
Fig. 9 is the embodiment of the invention three snapshot guard method schematic flow sheets;
Figure 10 creates snapshot copy synoptic diagram by duplicating mapping table and resource volume in the embodiment of the invention three;
Figure 11 is the embodiment of the invention four snapshot guard method schematic flow sheets;
Figure 12 creates snapshot copy synoptic diagram by sharing mapping table in the embodiment of the invention four;
Figure 13 is a copy synoptic diagram before snapshot and snapshot copy are write in the embodiment of the invention four;
Figure 14 writes the snapshot synoptic diagram in the embodiment of the invention four;
Figure 15 is the embodiment of the invention five snapshot protective device logical organization synoptic diagram;
Figure 16 is the embodiment of the invention six snapshot protective device logical organization synoptic diagram;
Figure 17 is the embodiment of the invention seven snapshot protective device logical organization synoptic diagram;
Figure 18 is the embodiment of the invention eight snapshot protective device logical organization synoptic diagram.
Embodiment
The embodiment of the invention provides a kind of snapshot guard method, to snapshot creation snapshot copy, respectively to snapshot and snapshot copy executable operations.The embodiment of the invention also provides corresponding snapshot protective device.Below be elaborated respectively.
Embodiment one, a kind of snapshot guard method, flow process comprises as shown in Figure 3:
A1, obtain indication to the first snapshot creation snapshot copy.
First snapshot in the present embodiment has general implication, promptly carries out the data object that data are preserved with image mode.First snapshot can be directly to roll up the snapshot of creating by producing, and also can be to have carried out the snapshot behind the retouching operation; And if the snapshot copy of creating still keeps the data structure of reflection formula, promptly still can be described as " snapshot ", then first snapshot can also be the copy of another snapshot, that is to say that the copy that can indicate snapshot creates a Copy again.
But the snapshot copy is created in same snapshot one or many indication, created the indication of snapshot copy and can at the beginning of first snapshot creation or after creating, make at any time.Mode is assigned in concrete indication and can determine opportunity according to applicable cases, includes but not limited to following example:
Be the raw data of protection snapshot, can be before needs to be made amendment to snapshot, the snapshot copy is created in indication;
For protecting amended snapshot, can carry out after snapshot revises, or before carrying out snapshot restore, or before revising once more, amended snapshot copy is created in indication;
Use for snapshot being offered many applied host machines, can at the beginning of snapshot creation, promptly create the snapshot copy that is no less than number of host, or the snapshot copy is created in indication at any time as required, to increase snapshot quantity according to the number of host indication.
A2, according to the indication of described establishment snapshot copy, create the copy of first snapshot.
The copy of creating snapshot can adopt various modes that can complete preservation snapshot data information, includes but not limited to:
Mode one, the data corresponding with the mapping table of first snapshot are carried out copying data, with the content of described copying data copy as first snapshot.An example of this mode as shown in Figure 4, first snapshot has been preserved certain and has been produced data mapping A, B, C, the D of volume constantly among Fig. 4, can be respectively snapshot copy 1～n by copying data with some parts of complete copy of first snapshot.Duplicate quantity and opportunity and determine that by the indication of the establishment snapshot copy that obtains in the steps A 1 application of snapshot copy includes but not limited to following example:
For protecting first snapshot, the snapshot copy 1 of first snapshot is created in indication, when first snapshot is modified, and when producing volume and wishing to return to the data of the first snapshot time point, earlier with snapshot copy 1 complete copy to first snapshot, carry out the snapshot rollback to producing volume then;
For carrying out many host application, snapshot copy 1～n that first snapshot is created in indication shines upon to a plurality of main frames according to application demand then;
For protecting amended first snapshot, the snapshot copy of amended first snapshot was created in i.e. indication after every first snapshot was revised.
The data structure of mode two, employing reflection formula is created the copy of first snapshot, makes snapshot and snapshot copy partly share or the shared data storage space of trying one's best.Snapshot and snapshot copy can only be shared the data of producing in the volume, also can also share and write preceding copies data etc., the snapshot copy that this mode is created has identical data structure form with snapshot, can be regarded as producing the snapshot of volume equally, adopts and snapshot identical operations processing mode.
A3, obtain operation indication to the copy of first snapshot and/or first snapshot.
Alleged herein operation indication comprises operation indication that maintenance data object content is constant and the operation indication that execution is revised to the data object, wherein:
Keep the constant operation of data object content to comprise: to the read operation of snapshot or snapshot copy; Adopt at snapshot or snapshot copy under the situation of data structure of reflection formula, when data mapping takes place to revise for copy function before constant the writing of carrying out of data content that keeps snapshot or snapshot copy etc.This generic operation indication can be made the snapshot or the snapshot copy of certain appointment, also can make some snapshot or snapshot copy.For example, can indicate the snapshot of reading certain appointment; Also can indicate all snapshots of sharing production volume data and snapshot copy to carry out and write preceding copy function owing to producing the volume data modification.Certainly,, therefore when producing the volume data modification, can not impact it because it adopts independently physical store for the snapshot copy that obtains by copying data mode complete copy.
The operation that the data object carry out is revised comprises write operation to snapshot or snapshot copy, recovery operation etc., and these operations can be indicated the execution object of appointment usually, and for example the snapshot or the snapshot copy of certain appointment write in indication.
In addition, for better controlling the operability of snapshot and snapshot copy, can comprise that also the special state of a class is provided with indication in the operation indication, this indication is made the snapshot or the snapshot copy of appointment usually.Be set to availablely or unavailable by the state of specifying snapshot or snapshot copy, better carry out data protection, avoid maloperation.For example, can stipulate to be set to when unavailable, can not carry out this snapshot and revise generic operation when snapshot state, constant to guarantee this snapshot data content; A kind of application scenarios of this example is, by after producing volume and creating, some copies of creating this snapshot offer to be used or test is used at certain snapshot, and that this snapshot is set to is unavailable, guarantee the complete of raw data with accurately.
A4, according to described operation indication, the copy of first snapshot and/or first snapshot is carried out corresponding operation.
The concrete operations content can be carried out according to the operation indication, and snapshot and snapshot copy all can be used as independently operand.Need to prove, establishment mode based on the snapshot copy, might in the process of execution in step A2 establishment snapshot copy, need to carry out duplicating of data content, if still imperfect tense in steps A 2, be that the snapshot copy is not created when finishing as yet, get access to the operation indication of steps A 3, and should operation indicate and relate to the snapshot copy of creating, can be in the following way:
If the operation indication is to have duplicated content partly at the snapshot copy, then carry out getting final product as indicated; If what the operation pointer was right is the content that the snapshot copy does not duplicate part, then can waits for after this part is duplicated and carry out corresponding operation again.
Present embodiment adopts snapshot creation snapshot copy, respectively to the method for snapshot and snapshot copy executable operations; Owing to adopt the snapshot copy that snapshot data is backed up, even make and revised snapshot data, also can recover the data of snapshot time point by the snapshot copy, provide effective protection to snapshot; Simultaneously, based on some copies of snapshot and snapshot, can satisfy parallel work-flow requirement to same time point snapshot data.
Based on embodiment one the some kinds of methods that adopt the protection snapshot of the mode of creating the snapshot copy are proposed below.
Embodiment two, a kind of snapshot guard method are compared with the mode of passing through copying data establishment snapshot copy that provides among the embodiment one, and the difference part is to adopt the mode of duplicating mapping table to create the snapshot copy, and flow process comprises as shown in Figure 5:
B1, obtain indication to the first snapshot creation snapshot copy.
But the steps A 1 in this step reference example one.
B2, according to the indication of described establishment snapshot copy, duplicate the mapping table of first snapshot and create second snapshot, with the mapping table of the described mapping table that duplicates, with the copy of second snapshot as first snapshot as second snapshot.
An example of this copy creating mode as shown in Figure 6, first snapshot has been preserved certain and has been produced data mapping A, B, C, the D of volume constantly among Fig. 6, generate the copy of second snapshot by the mapping table that duplicates first snapshot as first snapshot, in like manner, the mapping table that can also duplicate first snapshot once more generates the 3rd snapshot as another part of copy of first snapshot (certainly, the 3rd snapshot also can be the copy that duplicates second snapshot that the mapping table of second snapshot obtains).
Have identical data structure form by the snapshot copy that duplicates the mapping table generation with former snapshot, can be considered the snapshot of producing volume equally, can treat as common snapshot and carry out operations such as revising, create a Copy.
B3, obtain the operation of first snapshot and/or second snapshot indication.But the steps A 3 in this step reference example one, example is as follows:
B31, producing curly hair when giving birth to data modification, obtaining copy indication before the writing of each snapshot;
B32, obtain specifying the modification indication of snapshot.
B4, according to described operation indication, first snapshot and/or second snapshot are carried out corresponding operation.
For example, for the operation indication that step B31 obtains, execution in step is as follows:
B411, the production volume copying data that will need to revise are rolled up to the snapshot shared resource;
B412, with in the mapping table of the mapping table of first snapshot and second snapshot with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume.
Based on Fig. 6, the synoptic diagram of above-mentioned steps B411 and B412 as shown in Figure 7, when main frame need be written as " E " with the data " D " in the production volume, earlier " D " copied to the shared resource volume of snapshot, and then " D " that will produce in the volume is revised as " E ", and revise the mapping table of each snapshot, make relevant position in the pointed snapshot shared resource volume corresponding with data " D ".Because the 3rd snapshot is shared equally and is produced the volume data among Fig. 7, therefore also needs to revise the mapping table of the 3rd snapshot.Certainly, if host modifications is the production volume data of the part of copy before having carried out writing, then directly making amendment gets final product, and need not write preceding copy function again.
Owing to when creating second snapshot, need duplicate the mapping table of first snapshot, do not write preceding copy indication as if duplicating as yet at mapping table to get access to when finishing, can judge then whether the right map information of this pointer is replicated, if be replicated, then carry out this indication by said process and get final product, if be not replicated as yet, promptly the content that second snapshot is relevant with this indication is not created as yet, can think that copying indication before this is write only makes first snapshot, therefore needn't carry out this indication to second snapshot in creating.
For the operation indication that step B32 obtains, execution in step is as follows:
Whether B421, the data of judge to need revising have copied in the privately owned resource volume of specifying snapshot, if, execution in step B424 then; If not, execution in step B422 then;
B422, the copying data that will need to revise are rolled up to the privately owned resource of specifying snapshot;
B423, will specify in the mapping table of snapshot and this data corresponding address, be revised as the address of these data in specifying the privately owned resource volume of snapshot;
The data of appropriate address in the privately owned resource volume of B424, modification appointment snapshot.
Based on Fig. 7, the synoptic diagram of above-mentioned steps B421～B424 as shown in Figure 8, when main frame need be revised as " F " with the data in first snapshot " C ", earlier " C " copied to the privately owned resource volume of first snapshot, " C " original address information is revised as new address information in the privately owned resource volume of first snapshot in the mapping table with first snapshot then, again " C " in the privately owned resource volume of first snapshot is revised as " F ".Certainly, if follow-up main frame also needs to write first snapshot, if the data that need to revise have copied in the privately owned resource volume of snapshot, privately owned resource volume then can write direct.In addition, when carrying out above-mentioned steps, also can omit step B422, directly the data that will write are write in the privately owned resource volume of snapshot, and the respective pointer of revising the snapshot mapping table is then pointed to these data that write and got final product.
Adopt the mode of duplicating mapping table to create the copy of snapshot in the present embodiment, the copy of snapshot and snapshot is not only shared production volume data and is also had the shared resource volume, only will partly deposit its privately owned resource volume to the modification of specifying snapshot in, make snapshot and copy thereof share common data as far as possible, save storage space.The snapshot copy has the user property identical with snapshot simultaneously, remains the snapshot of producing volume, can equally with snapshot operate and handle.
Embodiment three, a kind of snapshot guard method are compared with the mode of passing through copying data establishment snapshot copy that provides among the embodiment one, and the difference part is to adopt the mode of duplicating mapping table and resource volume to create the snapshot copy, and flow process comprises as shown in Figure 9:
C1, obtain indication to the first snapshot creation snapshot copy.
But the steps A 1 in this step reference example one.
C2, according to the indication of described establishment snapshot copy, mapping table by duplicating first snapshot and resource are rolled up and are created second snapshot, with the copy of second snapshot as first snapshot; Concrete steps comprise:
C21, duplicate the map information in the mapping table of first snapshot;
C22, judge whether the address in the map information duplicated points to the resource volume of first snapshot, if execution in step C23 then; If not, then continue execution in step C21, duplicate another map information in the mapping table of first snapshot;
C23, the data of address correspondence described in the resource of first snapshot volume are copied in the resource volume of second snapshot, and the map information that makes this part in the mapping table of second snapshot points to the appropriate address in the resource volume of second snapshot, continue execution in step C21 then, duplicate another map information in the mapping table of first snapshot;
The mapping table of C24, first snapshot duplicates to be finished.
An example of this copy creating mode as shown in figure 10, first snapshot has been preserved certain and has been produced data mapping A, B, C, the D of volume constantly among Figure 10, wherein data A, B, C point to and produce volume, data D points to the resource volume of first snapshot.Generate the mapping table of second snapshot by the mapping table that duplicates first snapshot, for data A, B, C, only duplicate its map information, when the map information of copy data D, because these data are pointed to the resource volume of first snapshot, therefore need the resource volume of copy data D, then the map information of data D in the mapping table of second snapshot is pointed to the appropriate address in the resource volume of second snapshot to second snapshot.In like manner, mapping table and the resource that can also duplicate first snapshot once more rolled up the another part copy (certainly, three snapshot also can be duplicate the mapping table of second snapshot and the copy of second snapshot that resource volume obtain) of generation the 3rd snapshot as first snapshot.
Identical by the snapshot copy and the existing snapshot character of duplicating the generation of mapping table and resource volume, therefore can operate on it according to existing mode fully.
C3, obtain the operation of first snapshot and/or second snapshot indication.But the steps A 3 in this step reference example one, example is as follows:
C31, producing curly hair when giving birth to data modification, obtaining copy indication before the writing of each snapshot;
C4, according to described operation indication, first snapshot and/or second snapshot are carried out corresponding operation.
For example, for the operation indication that step C31 obtains, execution in step is as follows:
C411, the production volume copying data that will need to revise are rolled up to the resource of each snapshot;
C412, with in the mapping table of each snapshot with this data corresponding address, be revised as the address of these data in the resource of the snapshot of correspondence volume.
Because snapshot is all identical with existing snapshot character with the snapshot copy in the present embodiment, the processing mode of copy before the mode of copy function can adopt existing snapshot to write before therefore its execution being write.Certainly, with similar among the embodiment two, if carry out when writing preceding the copy, the mapping table of second snapshot does not duplicate as yet and finishes, and can judge then whether the right map information of this pointer is replicated, if be replicated, then carry out this indication by said process and get final product, if be not replicated as yet, promptly the content that second snapshot is relevant with this indication is not created as yet, can think that copying indication before this is write only makes first snapshot, therefore needn't carry out this indication to second snapshot in creating.
If what obtain among the step C3 is to specifying the modification indication of snapshot, for example to the modification indication of first snapshot or second snapshot, can carry out according to the existing mode of writing snapshot equally, repeating no more.
Adopt the mode of duplicating mapping table and resource volume to create the copy of snapshot in the present embodiment, snapshot copy and the existing snapshot character created are identical, therefore the processing mode to the snapshot copy can not increase the complexity of system handles with existing just the same to the processing mode of snapshot.
Embodiment four, a kind of snapshot guard method are compared with the mode of passing through copying data establishment snapshot copy that provides among the embodiment one, and the difference part is to adopt the mode of sharing mapping table to create the snapshot copy, and flow process comprises as shown in figure 11:
D1, obtain indication to the first snapshot creation snapshot copy.
But the steps A 1 in this step reference example one.
D2, according to the indication of described establishment snapshot copy, create second snapshot, with the mapping table of first snapshot shared mapping table, with the copy of second snapshot as first snapshot as first snapshot and second snapshot.
An example of this copy creating mode as shown in figure 12, first snapshot has been preserved certain and has been produced data mapping A, B, C, the D of volume constantly among Figure 12, by the mapping table of first snapshot is created the copy of second snapshot as first snapshot as the shared mapping table of first snapshot and second snapshot, in like manner, can also create the another part of copy (certainly, the 3rd snapshot also can be considered the copy of second snapshot) of first snapshot as the mapping table of the 3rd snapshot with sharing mapping table.
Have identical data structure form by the snapshot copy of sharing the mapping table generation with former snapshot, can be considered the snapshot of producing volume equally, can treat as common snapshot and carry out operations such as revising, create a Copy.
D3, obtain the operation of first snapshot and/or second snapshot indication.But the steps A 3 in this step reference example one, example is as follows:
D31, producing curly hair when giving birth to data modification, obtaining copy indication before the writing of each snapshot;
D32, obtain specifying the modification indication of snapshot.
D4, according to described operation indication, first snapshot and/or second snapshot are carried out corresponding operation.
For example, for the operation indication that step D31 obtains, execution in step is as follows:
D411, the production volume copying data that will need to revise are rolled up to the snapshot shared resource;
D412, with in the described shared mapping table with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume.
Based on Figure 12, the synoptic diagram of above-mentioned steps D411 and D412 as shown in figure 13, when main frame need be written as " E " with the data " D " in the production volume, earlier " D " copied to the shared resource volume of snapshot, and then " D " that will produce in the volume is revised as " E ", and the shared mapping table of modification snapshot, make relevant position in the pointed snapshot shared resource volume corresponding with data " D ".Because snapshot and copy thereof use same shared mapping table, therefore only need once revise getting final product.
For the operation indication that step D32 obtains, execution in step is as follows:
Whether D421, the data of judge to need revising have copied in the privately owned resource volume of specifying snapshot, if, execution in step D424 then; If not, execution in step D422 then;
D422, the copying data that will need to revise are rolled up to the privately owned resource of specifying snapshot;
D423, the address of these data in specifying the privately owned resource volume of snapshot write in the privately owned mapping table of specifying snapshot, the priority of described privately owned mapping table is higher than described shared mapping table;
The data of appropriate address in the privately owned resource volume of D424, modification appointment snapshot.
Based on Figure 13, the synoptic diagram of above-mentioned steps D421～D424 as shown in figure 14, when main frame need be revised as " F " with the data in first snapshot " C ", earlier " C " copied to the privately owned resource volume of first snapshot, create a privately owned mapping table then, preserve the data address of pointing in the privately owned resource volume, again " C " in the privately owned resource volume is revised as " F ".At this moment, for first snapshot, same data have just been preserved two addresses, because the priority of privately owned mapping table is higher, the first fast note thinks that the address in the privately owned mapping table is a true address.Certainly, if follow-up main frame also needs to write first snapshot, if the data that need to revise have copied in the privately owned resource volume of snapshot, privately owned resource volume then can write direct.In addition, when carrying out above-mentioned steps, also can omit step D422, directly the data that will write are write in the privately owned resource volume of snapshot, and the privately owned mapping table preserved into snapshot of the address of the data that this is write gets final product then.
Adopt the mode of sharing mapping table to create the copy of snapshot in the present embodiment, the copy of snapshot and snapshot is not only shared common data as far as possible, also shares mapping table information as far as possible, has farthest saved storage space.
Should be appreciated that the software of realizing snapshot guard method of the present invention can be stored in the computer-readable medium.This software when carrying out, comprise the steps: to obtain indication to the first snapshot creation snapshot copy;
According to the indication of described establishment snapshot copy, create the copy of first snapshot; Obtain operation indication to the copy of first snapshot and/or first snapshot; According to described operation indication, the copy of first snapshot and/or first snapshot is carried out corresponding operation.Described computer-readable recording medium, as: ROM/RAM, magnetic disc, CD etc.
Snapshot protective device to the embodiment of the invention is elaborated below.
Embodiment five, a kind of snapshot protective device 10 as shown in figure 15, comprising:
Protection trigger element 11 is used to obtain the indication to the first snapshot creation snapshot copy.
Copy creating unit 12 is used for the indication according to the establishment snapshot copy of protecting trigger element 11 to obtain, creates the copy of first snapshot.
Operation trigger element 13 is used to obtain the operation indication to the copy of first snapshot and/or first snapshot.
Operation execution unit 14 is used for the operation indication of obtaining according to operation trigger element 13, and the copy of first snapshot that first snapshot and/or copy creating unit 12 are created is carried out corresponding operation.
For better controlling the operability of snapshot and snapshot copy, can comprise in the operation indication that operation trigger element 13 obtains, the state of specifying snapshot is provided with indication; Can comprise status unit 141 in the corresponding operation execution unit 14, be used for getting access to when the state of specifying snapshot is provided with indication, specify the state of snapshot to be set to available or unavailable at operation trigger element 13.
Present embodiment snapshot protective device can be carried out corresponding snapshot guard method with reference to embodiment one.When copy creating unit 12 adopts the copying data mode that provides among the embodiment one to carry out the snapshot copy creating, copy creating unit 12 can be served as by the copying data unit, be used for the data corresponding with the mapping table of first snapshot are carried out copying data, with the content of described copying data copy as first snapshot.
Embodiment six, a kind of snapshot protective device 20 as shown in figure 16, comprising:
Protection trigger element 21 is used to obtain the indication to the first snapshot creation snapshot copy.
The table copied cells 22 that serves as the copy creating unit; be used for indication according to the establishment snapshot copy of protecting trigger element 21 to obtain; duplicate the mapping table of first snapshot and create second snapshot; with the mapping table of the described mapping table that duplicates, with the copy of second snapshot as first snapshot as second snapshot.
Operation trigger element 23 is used to obtain the operation indication to the copy of first snapshot and/or first snapshot.The operation of being obtained indication comprises, produce curly hair when giving birth to data modification to copy indication before the writing of each snapshot, to the modification indication of specifying snapshot, the state of specifying snapshot is provided with indication etc.
Operation execution unit 24 is used for the operation indication of obtaining according to operation trigger element 23, and the copy of first snapshot that first snapshot and/or copy creating unit 22 are created is carried out corresponding operation, specifically can comprise:
Status unit 241 is used for getting access to when the state of specifying snapshot is provided with indication at operation trigger element 23, specifies the state of snapshot to be set to available or unavailable;
Copy cell 242 before writing is used for getting access to before the writing of each snapshot during the copy indication at operation trigger element 23, and the production that needs are revised is rolled up copying data and rolled up to the snapshot shared resource; With in the mapping table of the mapping table of first snapshot and second snapshot with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume;
Data modification unit 243, be used for getting access to when specifying the modification indication of snapshot at operation trigger element 23, whether the data of judge to need revising have copied in the privately owned resource volume of specifying snapshot, if, then directly revise the privately owned resource of specifying snapshot roll up in the data of appropriate address; If not, the copying data that then will need to revise is to the privately owned resource volume of specifying snapshot, with specifying in the mapping table of snapshot and this data corresponding address, be revised as the address of these data in specifying the privately owned resource volume of snapshot, revise the data of appropriate address in the privately owned resource volume of specifying snapshot.
Present embodiment snapshot protective device can be carried out corresponding snapshot guard method with reference to embodiment two.
Embodiment seven, a kind of snapshot protective device 30 as shown in figure 17, comprising:
Protection trigger element 31 is used to obtain the indication to the first snapshot creation snapshot copy.
Copy creating unit 32 comprises:
Table replicon unit 321 is used for the indication according to the establishment snapshot copy of protecting trigger element 31 to obtain, creates second snapshot and duplicates the mapping table of the mapping table of first snapshot as second snapshot, with the copy of second snapshot as first snapshot;
Volume replicon unit 322, when being used for duplicating the mapping table of first snapshot in table replicon unit 321, judge whether the map information of the part of duplicating points to the resource volume of first snapshot, if, then the data with appropriate address in the resource of first snapshot volume copy in the resource volume of second snapshot, and make the map information of this part in the mapping table of second snapshot point to appropriate address in the resource volume of second snapshot.
Operation trigger element 33 is used to obtain the operation indication to the copy of first snapshot and/or first snapshot.The operation indication of being obtained comprises, when production curly hair is given birth to data modification the preceding copy of writing of each snapshot is indicated, the state of specifying snapshot is provided with indication etc.;
Operation execution unit 34 is used for the operation indication of obtaining according to operation trigger element 33, and the copy of first snapshot that first snapshot and/or copy creating unit 32 are created is carried out corresponding operation, specifically can comprise:
Status unit 341 is used for getting access to when the state of specifying snapshot is provided with indication at operation trigger element 33, specifies the state of snapshot to be set to available or unavailable;
Copy cell 342 before writing is used for getting access to before the writing of each snapshot during the copy indication at operation trigger element 33, and the production volume copying data that needs are revised is rolled up to the resource of each snapshot; With in the mapping table of each snapshot with this data corresponding address, be revised as the address of these data in the resource of the snapshot of correspondence volume.
Present embodiment snapshot protective device can be carried out corresponding snapshot guard method with reference to embodiment two.
Embodiment eight, a kind of snapshot protective device 40 as shown in figure 18, comprising:
Protection trigger element 41 is used to obtain the indication to the first snapshot creation snapshot copy.
The table shared cell 42 that serves as the copy creating unit; be used for indication according to the establishment snapshot copy of protecting trigger element 41 to obtain; create second snapshot, with the mapping table of first snapshot shared mapping table, with the copy of second snapshot as first snapshot as first snapshot and second snapshot.
Operation trigger element 43 is used to obtain the operation indication to the copy of first snapshot and/or first snapshot.The operation of being obtained indication comprises, produce curly hair when giving birth to data modification to copy indication before the writing of each snapshot, to the modification indication of specifying snapshot, the state of specifying snapshot is provided with indication etc.
Operation execution unit 44 is used for the operation indication of obtaining according to operation trigger element 43, and the copy of first snapshot that first snapshot and/or copy creating unit 42 are created is carried out corresponding operation, specifically can comprise:
Status unit 441 is used for getting access to when the state of specifying snapshot is provided with indication at operation trigger element 43, specifies the state of snapshot to be set to available or unavailable;
Copy cell 442 before writing is used for getting access to before the writing of each snapshot during the copy indication at operation trigger element 43, and the production that needs are revised is rolled up copying data and rolled up to the snapshot shared resource; With in the described shared mapping table with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume.
Data modification unit 443, be used for getting access to when specifying the modification indication of snapshot at operation trigger element 43, whether the data of judge to need revising have copied in the privately owned resource volume of specifying snapshot, if, then directly revise the privately owned resource of specifying snapshot roll up in the data of appropriate address; If not, the copying data that then will need to revise is to the privately owned resource volume of specifying snapshot, the address of these data in specifying the privately owned resource volume of snapshot write in the privately owned mapping table of specifying snapshot, the priority of described privately owned mapping table is higher than described shared mapping table, revises the data of appropriate address in the privately owned resource volume of specifying snapshot.
Present embodiment snapshot protective device can be carried out corresponding snapshot guard method with reference to embodiment four.
Should be understood that; the copy creating unit of embodiment of the invention snapshot protective device can comprise copying data unit, table copied cells, table replicon unit, volume replicon unit, the table shared cell in the foregoing description five～eight simultaneously; make the snapshot protective device that different copy creating modes can be provided simultaneously; when needs are created the snapshot copy, can select the mode of actual employing or determine the actual mode that adopts by system by the user according to certain rule.Certainly, if determine to adopt certain mode in the aforesaid way to create the snapshot copy, then follow-up operation to this snapshot copy should be carried out according to the mode of correspondence.
By the foregoing description as can be seen, the embodiment of the invention adopts snapshot creation snapshot copy, respectively to the method for snapshot and snapshot copy executable operations; Owing to adopt the snapshot copy that snapshot data is backed up, even make and revised snapshot data, also can recover the data of snapshot time point by the snapshot copy, provide effective protection to snapshot; Simultaneously, based on some copies of snapshot and snapshot, can satisfy parallel work-flow requirement to same time point snapshot data.In addition, also provide the method that makes snapshot copy and snapshot share common data even shared mapping table in embodiments of the present invention, can effectively save storage resources.
More than snapshot guard method and device that the embodiment of the invention provided are described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (15)

1, a kind of snapshot guard method is characterized in that, comprising:
Obtain indication to the first snapshot creation snapshot copy;
According to the indication of described establishment snapshot copy, duplicate the mapping table of first snapshot and create second snapshot, with the mapping table of the described mapping table that duplicates, with the copy of second snapshot as first snapshot as second snapshot;
Obtain to produce and perm when giving birth to data modification, to the preceding copy indication of writing of each snapshot; The production volume copying data that needs are revised is rolled up to the snapshot shared resource; With in the mapping table of the mapping table of first snapshot and second snapshot with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume;
Obtain specifying the modification indication of snapshot; Whether the data of judge to need revising have copied in the privately owned resource volume of specifying snapshot, if, then directly revise the privately owned resource of specifying snapshot roll up in the data of appropriate address; If not, then
The copying data that needs are revised is rolled up to the privately owned resource of specifying snapshot,
With specifying in the mapping table of snapshot and this data corresponding address, be revised as the address of these data in specifying the privately owned resource volume of snapshot,
Revise the data of appropriate address in the privately owned resource volume of specifying snapshot.
2, snapshot guard method according to claim 1 is characterized in that, described first snapshot is the copy of another snapshot.
3, snapshot guard method according to claim 1 and 2 is characterized in that, also comprises: the state that obtains specifying snapshot is provided with indication; Specify the state of snapshot to be set to available or unavailable.
4, a kind of snapshot guard method is characterized in that, comprising:
Obtain indication to the first snapshot creation snapshot copy;
According to the indication of described establishment snapshot copy, create second snapshot and duplicate the mapping table of the mapping table of first snapshot, with the copy of second snapshot as first snapshot as second snapshot;
When duplicating the mapping table of first snapshot, judge whether the map information of the part of duplicating points to the resource volume of first snapshot, if, then the data with appropriate address in the resource of first snapshot volume copy in the resource volume of second snapshot, and make the map information of this part in the mapping table of second snapshot point to appropriate address in the resource volume of second snapshot;
Obtain to produce and perm when giving birth to data modification, to the preceding copy indication of writing of each snapshot; The production volume copying data that needs are revised is rolled up to the resource of each snapshot; With in the mapping table of each snapshot with this data corresponding address, be revised as the address of these data in the resource of the snapshot of correspondence volume.
5, snapshot guard method according to claim 4 is characterized in that, described first snapshot is the copy of another snapshot.
6, according to claim 4 or 5 described snapshot guard methods, it is characterized in that, also comprise: the state that obtains specifying snapshot is provided with indication; Specify the state of snapshot to be set to available or unavailable.
7, a kind of snapshot guard method is characterized in that, comprising:
Obtain indication to the first snapshot creation snapshot copy;
According to the indication of described establishment snapshot copy, create second snapshot, with the mapping table of first snapshot shared mapping table, with the copy of second snapshot as first snapshot as first snapshot and second snapshot.
Obtain to produce and perm when giving birth to data modification, to the preceding copy indication of writing of each snapshot; The production volume copying data that needs are revised is rolled up to the snapshot shared resource; With in the described shared mapping table with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume.
Obtain specifying the modification indication of snapshot, judge the data that need to revise whether to copy in the privately owned resource volume of specifying snapshot, if, then directly revise the privately owned resource of specifying snapshot roll up in the data of appropriate address; If not, then
The copying data that needs are revised is rolled up to the privately owned resource of specifying snapshot,
The address of these data in specifying the privately owned resource volume of snapshot write in the privately owned mapping table of specifying snapshot, and the priority of described privately owned mapping table is higher than described shared mapping table,
Revise the data of appropriate address in the privately owned resource volume of specifying snapshot.
8, snapshot guard method according to claim 7 is characterized in that, described first snapshot is the copy of another snapshot.
9, according to claim 7 or 8 described snapshot guard methods, it is characterized in that, also comprise: the state that obtains specifying snapshot is provided with indication; Specify the state of snapshot to be set to available or unavailable.
10, a kind of snapshot protective device is characterized in that, comprising:
The protection trigger element is used to obtain the indication to the first snapshot creation snapshot copy;
The copy creating unit is used for the indication according to described establishment snapshot copy, creates the copy of first snapshot;
The operation trigger element is used to obtain the operation indication to the copy of first snapshot and/or first snapshot;
Operation execution unit is used for according to described operation indication the copy of first snapshot and/or first snapshot being carried out corresponding operation;
Described copy creating unit comprises the table copied cells, is used to duplicate the mapping table of first snapshot and creates second snapshot, with the mapping table of the described mapping table that duplicates as second snapshot, with the copy of second snapshot as first snapshot;
Operation that described operation trigger element obtains indication comprises, produce curly hair when giving birth to data modification to copy indication before the writing of each snapshot, to specifying the modification indication of snapshot;
Described operation execution unit comprises writes preceding copy cell, is used for getting access to before the writing of each snapshot during the copy indication at described operation trigger element, and the production volume copying data that needs are revised is rolled up to the snapshot shared resource; With in the mapping table of the mapping table of first snapshot and second snapshot with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume;
Described operation execution unit also comprises the data modification unit, be used for getting access to when specifying the modification indication of snapshot at described operation trigger element, judge whether the data that need to revise have copied in the privately owned resource volume of specifying snapshot, if, the data of appropriate address during then directly the privately owned resource of modification appointment snapshot is rolled up; If not, the copying data that then will need to revise is to the privately owned resource volume of specifying snapshot, with specifying in the mapping table of snapshot and this data corresponding address, be revised as the address of these data in specifying the privately owned resource volume of snapshot, revise the data of appropriate address in the privately owned resource volume of specifying snapshot.
11, snapshot protective device according to claim 10 is characterized in that, the operation indication that described operation trigger element obtains also comprises, the state of specifying snapshot is provided with indication;
Described operation execution unit also comprises status unit, is used for getting access to when the state of specifying snapshot is provided with indication at described operation trigger element, specifies the state of snapshot to be set to available or unavailable.
12, a kind of snapshot protective device is characterized in that, comprising:
The protection trigger element is used to obtain the indication to the first snapshot creation snapshot copy;
The copy creating unit is used for the indication according to described establishment snapshot copy, creates the copy of first snapshot;
The operation trigger element is used to obtain the operation indication to the copy of first snapshot and/or first snapshot;
Operation execution unit is used for according to described operation indication the copy of first snapshot and/or first snapshot being carried out corresponding operation;
Described copy creating unit comprises:
Table replicon unit is used to the mapping table creating second snapshot and duplicate first snapshot mapping table as second snapshot, with the copy of second snapshot as first snapshot,
Volume replicon unit, when being used for duplicating the mapping table of first snapshot in described table replicon unit, judge whether the map information of the part of duplicating points to the resource volume of first snapshot, if, then the data with appropriate address in the resource of first snapshot volume copy in the resource volume of second snapshot, and make the map information of this part in the mapping table of second snapshot point to appropriate address in the resource volume of second snapshot;
The operation indication that described operation trigger element obtains comprises, produces and perms when giving birth to data modification to the preceding copy indication of writing of each snapshot;
Described operation execution unit comprises writes preceding copy cell, is used for getting access to before the writing of each snapshot during the copy indication at described operation trigger element, and the production volume copying data that needs are revised is to the resource volume of each snapshot; With in the mapping table of each snapshot with this data corresponding address, be revised as the address of these data in the resource of the snapshot of correspondence volume.
13, snapshot protective device according to claim 12 is characterized in that, the operation indication that described operation trigger element obtains also comprises, the state of specifying snapshot is provided with indication;
Described operation execution unit also comprises status unit, is used for getting access to when the state of specifying snapshot is provided with indication at described operation trigger element, specifies the state of snapshot to be set to available or unavailable.
14, a kind of snapshot protective device is characterized in that, comprising:
The protection trigger element is used to obtain the indication to the first snapshot creation snapshot copy;
The copy creating unit is used for the indication according to described establishment snapshot copy, creates the copy of first snapshot;
The operation trigger element is used to obtain the operation indication to the copy of first snapshot and/or first snapshot;
Operation execution unit is used for according to described operation indication the copy of first snapshot and/or first snapshot being carried out corresponding operation;
Described copy creating unit comprises the table shared cell, is used to create second snapshot, with the mapping table of the first snapshot shared mapping table as first snapshot and second snapshot, with the copy of second snapshot as first snapshot;
Operation that described operation trigger element obtains indication comprises, produce curly hair when giving birth to data modification to copy indication before the writing of each snapshot, to specifying the modification indication of snapshot;
Described operation execution unit comprises writes preceding copy cell, is used for getting access to before the writing of each snapshot during the copy indication at described operation trigger element, and the production volume copying data that needs are revised is rolled up to the snapshot shared resource; With in the described shared mapping table with this data corresponding address, be revised as the address of these data in described snapshot shared resource volume;
Described operation execution unit comprises the data modification unit, be used for getting access to when specifying the modification indication of snapshot at described operation trigger element, judge whether the data that need to revise have copied in the privately owned resource volume of specifying snapshot, if, the data of appropriate address during then directly the privately owned resource of modification appointment snapshot is rolled up; If not, the copying data that then will need to revise is to the privately owned resource volume of specifying snapshot, the address of these data in specifying the privately owned resource volume of snapshot write in the privately owned mapping table of specifying snapshot, the priority of described privately owned mapping table is higher than described shared mapping table, revises the data of appropriate address in the privately owned resource volume of specifying snapshot.
15, snapshot protective device according to claim 14 is characterized in that, the operation indication that described operation trigger element obtains also comprises, the state of specifying snapshot is provided with indication;
Described operation execution unit also comprises status unit, is used for getting access to when the state of specifying snapshot is provided with indication at described operation trigger element, specifies the state of snapshot to be set to available or unavailable.
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