CN1658168A - Method for writing data on source film in pistolgraph process - Google Patents
Method for writing data on source film in pistolgraph process Download PDFInfo
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- CN1658168A CN1658168A CN 200410004415 CN200410004415A CN1658168A CN 1658168 A CN1658168 A CN 1658168A CN 200410004415 CN200410004415 CN 200410004415 CN 200410004415 A CN200410004415 A CN 200410004415A CN 1658168 A CN1658168 A CN 1658168A
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- 238000000034 method Methods 0.000 title claims abstract description 101
- 238000012217 deletion Methods 0.000 claims description 2
- 230000037430 deletion Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
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Abstract
This invention discloses a method about writing data into the initial roll during the process of snapshot. The writing flow includes A1, Judge whether there is the initial roll's address pointing to the index of the temporary snapshot roll. If that exists, the data will be written into the address of corresponding temporary snapshot roll. If not, go to the next step. B1, Set up an index pointing to the corresponding address of temporary snapshot roll and write the data into the address of temporary snapshot roll. The rewriting flow includes A2, Judge whether the condition corresponds to the reserved the rewriting-flow-start condition. If so, go to B2. If not, return to A2. B2, judge whether the address of temporary snapshot roll corresponding to the initial roll's address bet-image designation has been copied to the snapshot roll. If so, copy the data of temporary snapshot roll to the corresponding address of initial roll, and delete the corresponding index.. Else, go to the next step. C2, read the next data on the temporary snapshot roll, and then return to Step B2. Using this invention, the response speed can be increase when writing data to the host computer during snapshot, and the it can reduce the writing d\retardation during snapshot.
Description
Technical field
The present invention relates to the data of magnetic disk array redundancy technique, be meant in a kind of snapshot processes method especially to the source book write data.
Background technology
At disk array (RAID, Redundant Access Independent Disk) in the system, backup request for data is very high, is not only required in the data backup process and can not interrupts current business, also requires to reduce as far as possible the influence that backup procedure brings for other operations of main frame.At present, use snapshot (Snapshot) technology to realize the quick backup of data usually.Snapshot is a kind of fast data backup technology, can set up a copy for current logical volume in a short period of time.Current logical volume described here is a source book, and the copy of foundation is called snapped volume.
At present, in snapshot processes, when the RAID system received the write data requests that main frame issues simultaneously, main frame was by the cooperation of source book, snapped volume and interim snapped volume, and by safeguarding that a bitmap and a pointer chained list can realize that main frame is to the write data of source book in the snapshot processes.The interim snapped volume here is used for storing ephemeral data, and whether the data that bitmap is used for identifying in the source book are updated and whether have copied to snapped volume.
In snapshot processes, main frame may cover the source volume data that does not backup to as yet in the snapped volume to the new data that source book issues, in this case, at first the former copying data with the corresponding itemize of source book (Strip) arrives interim snapped volume, and copying itemize position on the interim snapped volume to by pointer record, these former data are read to snapped volume in the itemize position of the interim snapped volume of being located from pointer when being used for snapshot.Simultaneously, for each itemize in the source book, identify by two bitmap A and B, whether a bitmap A is used for identifying during the snapshot on the source book this itemize content and was upgraded by main frame, and whether another bitmap B is used for identifying this itemize content and copies on the snapped volume.
When snapshot started, initialization bitmap at first was 0 with the whole set of bitmap A, B of each itemize of source book, starts a background copy thread then, successively with the data on the source book from the low address to the high address one by one itemize copy on the snapped volume.Every copy finishes itemize data, and just bitmap A, the B with this itemize is revised as 1.After main frame issued write data requests in the snapshot processes, referring to shown in Figure 1, main frame may further comprise the steps the write data process of source book:
Step 101: main frame receives the order of write data requests, at first checks the bitmap sign of the source book itemize that will write, if bitmap A=1 then directly writes in this itemize, finishes writing of data, finishes; If bitmap A=0 and B=0, represent that then this itemize was not upgraded, also do not copy on the snapped volume by main frame, then temporarily write data requests is hung up, distribute an itemize at interim snapped volume earlier, and in the pointer chained list, add to point to the pointer of this itemize, data with this itemize on the source book copy on the itemize of interim snapped volume then, afterwards execution in step 102 again.
Step 102: recover the write data requests of main frame, new data is write the corresponding itemize of source book position, and revise bitmap sign A=1.
When the copy thread of snapshot relates to the itemize of described bitmap A=1 of step 102 and B=0, according to the described pointer chained list of step 101 with the copying data on the interim snapped volume to snapped volume, delete this pointer then, and revise the bitmap B=1 of corresponding source book itemize.
As can be seen, during snapshot, when main frame sends write data requests to source book, if the legacy data of relevant itemize does not copy snapped volume or interim snapped volume as yet in the source book, then need the temporary transient earlier write data requests that has hung main frame, the legacy data of relevant itemize on the source book is copied on the interim snapped volume, continue the write data requests of main frame afterwards, new data is write source book.Because suspension write data requests temporarily, so main frame is still bigger to the response time-delay of the write data requests that the user issues, and when causing the user to initiate write data requests, wait for that certain hour could write data.
Summary of the invention
In view of this, the method to the source book write data is provided to provide in a kind of snapshot processes fundamental purpose of the present invention, improves during the snapshot response speed to the main frame write data, the main frame write delay when shortening snapshot.
When snapshot starts with the bitmap initialization of each address correspondence of source book, successively the order of the data on the source book is copied on the snapped volume address one by one, every copy finishes an address, the bitmap of this address correspondence is carried out set, main frame receives when specifying the order of source book address write data, and this method comprises writes flow process and write-back flow process in the snapshot:
The flow process of writing in the snapshot may further comprise the steps:
A1, judge whether to exist described source book address to point to the index of interim snapped volume,, then data are write in the address of interim snapped volume pointed, otherwise carry out next step if exist;
B1, set up an index that points to interim snapped volume appropriate address, data are write in this address of interim snapped volume;
The write-back flow process may further comprise the steps:
A2, judge whether to meet predefined write-back flow startup condition, if meet, execution in step B2 then; Otherwise return steps A 2;
B2, judge the address bitmap set whether on the corresponding source book of appropriate address on the interim snapped volume, if, then with the copying data on the interim snapped volume to the source book appropriate address, and delete respective index; Otherwise execution next step;
C2, read the next data on the interim snapped volume, and return step B2.
Wherein, further comprise step: B10 between steps A 1, the B1, judge the corresponding bitmap of the source book address carry out write operation,, finish if bitmap set then writes data in this address of source book; Otherwise, execution in step B1.
Wherein, step B2 judges when the address bitmap on the corresponding source book of appropriate address does not have set on the interim snapped volume, further comprise step B21 between step B2, the C2: copy this address date on the source book to snapped volume, corresponding bitmap is carried out set, and with the copying data on the interim snapped volume to the source book appropriate address, the deletion respective index.
Wherein, steps A 2 described predefined entry conditions are: when copying the source book address date to snapped volume, detect described source book address and have index.
Wherein, steps A 2 described predefined entry conditions are: the index length that detects step B1 foundation surpasses predetermined threshold value, or arrives the value of being scheduled to for detecting the timer that sets in advance.
Wherein, steps A 2 described predefined entry conditions are: the following a snapshot process that detects this source book starts.
Wherein, this method further comprises: hang up detected a snapshot process down, when detecting the end of write-back flow process, recover described a snapshot process down.
Wherein, after a snapshot process, further comprise step: B10 between steps A 1, the B1, judge the bitmap that will write corresponding each snapshot of address in the source book under starting,, finish if all set of bitmap then writes data in this address of source book; Otherwise, execution in step B1; The address of the address bitmap set on the described source book of corresponding step B2 is meant all addresses of set of each snapshot bitmap.
Wherein, after starting described a snapshot process down, comprise further between steps A 1, the B1 that step: B10, each snapshot process write down the copy progress of snapshot separately, copy progress according to record judges whether the data in the address that will write in the source book are copied to snapped volume separately by each snapshot process, if, then these data are write in this address of source book, finish; Otherwise, execution in step B1; The address of the address bitmap set on the described source book of corresponding step B2 is meant all addresses of set of each snapshot bitmap.
By said method as can be seen, the present invention is in snapshot processes, the data of main frame are write at first write on the interim snapped volume, the problem of having avoided waiting legacy data to be copied and having hung up the main frame write data requests occurs, with the copying data of source book behind snapped volume, again the data on the interim snapped volume are returned on the source book.Main frame has reduced the write delay that snapshot processes is brought to the user to user written data request responding speed during having improved snapshot on the whole.
Description of drawings
Fig. 1 is the write operation process flow diagram in the snapshot processes under the prior art.
Fig. 2 is the write operation process flow diagram in the snapshot processes of the present invention.
Fig. 3 carries out second part of snapshot process flow diagram in first part of snapshot processes.
Embodiment
The invention provides in a kind of snapshot processes main frame to the method for source book write data.In snapshot processes, when main frame sends write data requests to source book, its new data is all write on the interim snapped volume, and set up by the itemize that index writes data with corresponding itemize of source book and interim snapped volume and to get in touch, when carrying out snapshot from source book successively with each itemize copying data to snapped volume, again the data on the interim snapped volume are returned on the source book afterwards, be implemented in the write data of main frame in the snapshot processes.Use this method, main frame need not be hung up write data requests in snapshot processes, therefore needn't the user wait for, has improved the response speed of write data requests order in the snapshot processes.
The present invention relates to concordance list and a bitmap C, wherein concordance list is used for the source book itemize that will will write and sets up corresponding relation with the itemize of the interim snapped volume that is write, and is identical with the function of the described pointer chained list of background technology; Whether the data that bitmap C wherein is used for identifying the corresponding itemize of source book copy snapped volume to.
When snapshot starts, the bitmap C of each itemize correspondence of source book all is initialized as 0, represents that the data of these itemizes do not copy on the snapped volume.Start a background copy thread then, successively with the data on the source book from the low address to the high address one by one itemize copy on the snapped volume, every copy finishes itemize data, just this itemize bitmap C is changed to 1, represents that the data of this itemize copy on the snapped volume.
Fig. 2 is the write operation process flow diagram in the snapshot processes of the present invention.The present invention realizes in the snapshot processes to the process of source book write data, comprises writing flow process and write-back flow process in the snapshot, and as shown in Figure 2, the flow process of writing in the snapshot comprises step 201-202, and the write-back flow process comprises step 203-204.Wherein, can when index length reaches threshold value, trigger the write-back flow process by preestablishing the index length threshold.Below by specific embodiment with reference to accompanying drawing 2, the present invention is described in more detail.
Step 201: during the snapshot, after main frame receives the user written data request command, main frame is at first according to the index that whether has corresponding itemize in the concordance list, judge in the interim corresponding itemize of snapped volume and whether have data, if there is the index of this itemize in the concordance list, represent that the corresponding itemize of interim snapped volume has data, then data are write in this itemize of interim snapped volume, that is, the data in the interim snapped volume are upgraded; If there is not the index of this itemize, then execution in step 202.
Step 202: main frame detects the bitmap C of this itemize in the source book, if C=1, the expression snapshot process with this itemize copying data on the source book to snapped volume, then these data are write in this itemize of source book, finish data writing to source book; If C=0, the expression snapshot process is not also then upgraded this itemize copying data on the source book to snapped volume to source book, and sets up the itemize of an interim snapped volume correspondence of index point, and the data that main frame is issued write in this itemize of interim snapped volume.For the purpose of convenient, the position of data storage on interim snapped volume can be corresponding one by one with the position on the source book, for example, if can't write data at the itemize of source book logical address 5-10 correspondence, then main frame is directly write new data on the itemize position of the identical logical address 5-10 of interim snapped volume.
When index length surpasses predefined length threshold, start the write-back flow process, that is, and with the data of interim each itemize of snapped volume one by one itemize move on the itemize of source book correspondence.Wherein, the method for described startup write-back flow process also can adopt timer regularly to start except the control by index length starts, and starts when perhaps being begun by following a snapshot process.Described write-back process may further comprise the steps:
Step 203: read a record of interim snapped volume, judge the bitmap C of the source book itemize that this record is corresponding, if C=1, then with the copying data in the interim snapped volume of correspondence in this itemize of source book, and delete this index, execution in step 204 then; If C=0, the expression snapshot process also not with this itemize copying data on the source book to snapped volume, then this itemize suspension is not dealt with execution in step 204.
Step 204: read next data in the interim snapped volume, and return step 203, the data full recovery of each itemize is to the itemize of source book correspondence in interim snapped volume.
Wherein step 204 also can be: this itemize copying data in the source book to snapped volume, and is put C=1, then with the copying data in the interim snapped volume of correspondence in this itemize of source book, and delete this index.Read next data in the interim snapped volume afterwards, and return step 203, the data full recovery of each itemize is to the itemize of source book correspondence in interim snapped volume.
Wherein, above-mentioned write-back flow process also can realize in the following manner.In snapshot processes, source book itemize copying data is behind snapped volume, C is changed to 1 with this itemize bitmap, detect this itemize then and whether have index, if being illustrated in the interim snapped volume corresponding itemize has new data to exist, with this itemize copying data in the interim snapped volume to this itemize of source book, and delete this index, continue snapshot process then; Otherwise proceed snapshot, copy next data to snapped volume.
In addition, for a source book, may there be a plurality of snapshots in synchronization, describes shown in accompanying drawing 3.When in first part of snapshot processes, second part of snapshot process then at first hung up in the order of receiving second part of snapshot, and starts the write-back flow process, with the data full recovery of each itemize in the interim snapped volume to the corresponding itemize of source book.After the write-back flow process finishes, create the bitmap of second part of snapshot, begin second part of snapshot.By starting the write-back flow process, guarantee to start constantly at second part of snapshot, the Data Update on the current source book is the latest data in the moment for this reason, also is this latest data constantly with regard to the content that has guaranteed second part of snapshot, guarantees the accuracy of snapshot contents.
The bitmap of twice snapshot is respectively snapshot process service separately, and second part of snapshot initialization bitmap can't be influential to ongoing first part of snapshot process, that is to say that second part of snapshot can not cause with first part of snapshot to conflict.When this how soon according to situation under, when main frame issues write data requests, analyze the bitmap C of a plurality of snapshots of the corresponding itemize of source book at first earlier, if being 1 covering writes source book, be 0 if there is the corresponding bitmap C of snapshot, then write interim snapped volume and set up index.Like this, realized all having finished copy for this itemize when each snapshot, then data write source book, when for the slowest snapshot progress, also do not have the former copying data of this itemize then to write interim snapped volume to snapped volume.
Certainly, because snapshot is a linear copies data from the low address to the high address, also can write down the copy progress of snapshot separately by each snapshot process, copy progress according to record judges whether the former data of current itemize are all copied by each snapshot process, if, then new data is write in this itemize of source book, finish write operation; Otherwise, write interim snapped volume and set up index.
The present invention is that unit describes with the itemize, and obviously, when described unit was magnetic track, piece (Block) or other storage cells, this invention stood good.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, in a kind of snapshot processes to the method for source book write data, when snapshot starts with the bitmap initialization of each address correspondence of source book, successively the order of the data on the source book is copied on the snapped volume address one by one, every copy finishes an address, the bitmap of this address correspondence is carried out set, main frame receives when specifying the order of source book address write data, it is characterized in that, this method comprises writes flow process and write-back flow process in the snapshot:
The flow process of writing in the snapshot may further comprise the steps:
A1, judge whether to exist described source book address to point to the index of interim snapped volume,, then data are write in the address of interim snapped volume pointed, otherwise carry out next step if exist;
B1, set up an index that points to interim snapped volume appropriate address, data are write in this address of interim snapped volume;
The write-back flow process may further comprise the steps:
A2, judge whether to meet predefined write-back flow startup condition, if meet, execution in step B2 then; Otherwise return steps A 2;
B2, judge the address bitmap set whether on the corresponding source book of appropriate address on the interim snapped volume, if, then with the copying data on the interim snapped volume to the source book appropriate address, and delete respective index; Otherwise execution next step;
C2, read the next data on the interim snapped volume, and return step B2.
2, method according to claim 1 is characterized in that, further comprises step between steps A 1, the B1:
The corresponding bitmap of the source book address of write operation is carried out in B10, judgement, if bitmap set then writes data in this address of source book, finishes; Otherwise, execution in step B1.
3, method according to claim 1, it is characterized in that, step B2 judges when the address bitmap on the corresponding source book of appropriate address does not have set on the interim snapped volume, further comprise step B21 between step B2, the C2: copy this address date on the source book to snapped volume, corresponding bitmap is carried out set, and with the copying data on the interim snapped volume to the source book appropriate address, the deletion respective index.
4, method according to claim 1 is characterized in that, steps A 2 described predefined entry conditions are: when copying the source book address date to snapped volume, detect described source book address and have index.
5, method according to claim 1 is characterized in that, steps A 2 described predefined entry conditions are: the index length that detects step B1 foundation surpasses predetermined threshold value, or arrives the value of being scheduled to for detecting the timer that sets in advance.
6, method according to claim 1 is characterized in that, steps A 2 described predefined entry conditions are: the following a snapshot process that detects this source book starts.
7, method according to claim 6 is characterized in that, this method further comprises: hang up detected a snapshot process down, when detecting the end of write-back flow process, recover described a snapshot process down.
8, method according to claim 7 is characterized in that, after a snapshot process, further comprises step between steps A 1, the B1 under starting:
To write the bitmap of corresponding each snapshot of address in B10, the judgement source book,, finish if all set of bitmap then writes data in this address of source book; Otherwise, execution in step B1;
The address of the address bitmap set on the described source book of corresponding step B2 is meant all addresses of set of each snapshot bitmap.
9, method according to claim 7 is characterized in that, start described down a snapshot process after, further comprise step between steps A 1, the B1:
B10, each snapshot process write down the copy progress of snapshot separately, copy progress according to record judges whether the data in the address that will write in the source book are copied to snapped volume separately by each snapshot process, if, then these data are write in this address of source book, finish; Otherwise, execution in step B1;
The address of the address bitmap set on the described source book of corresponding step B2 is meant all addresses of set of each snapshot bitmap.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100044152A CN100349139C (en) | 2004-02-19 | 2004-02-19 | Method for writing data on source film in pistolgraph process |
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| CNB2004100044152A CN100349139C (en) | 2004-02-19 | 2004-02-19 | Method for writing data on source film in pistolgraph process |
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| CN1658168A true CN1658168A (en) | 2005-08-24 |
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| CN112269531B (en) * | 2020-10-10 | 2023-01-10 | 苏州浪潮智能科技有限公司 | Source roll capacity reduction method, device, equipment and medium |
| CN113868023A (en) * | 2021-09-24 | 2021-12-31 | 苏州浪潮智能科技有限公司 | Snapshot method and device of storage system, electronic equipment and readable storage medium |
| CN113868023B (en) * | 2021-09-24 | 2023-11-14 | 苏州浪潮智能科技有限公司 | Snapshot method and device of storage system, electronic equipment and readable storage medium |
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| CN100349139C (en) | 2007-11-14 |
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