CN103473266A - Solid state disk and method for deleting repeating data thereof - Google Patents
Solid state disk and method for deleting repeating data thereof Download PDFInfo
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- CN103473266A CN103473266A CN2013103452985A CN201310345298A CN103473266A CN 103473266 A CN103473266 A CN 103473266A CN 2013103452985 A CN2013103452985 A CN 2013103452985A CN 201310345298 A CN201310345298 A CN 201310345298A CN 103473266 A CN103473266 A CN 103473266A
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Abstract
The invention is suitable for the technical field of storage, and discloses a method for deleting repeating data in a solid state disk. The method comprises the following steps: presetting a data fingerprint library of the solid state disk, wherein fingerprints of the solid state disk data are stored in the fingerprint library; when data are written into the solid state disk, calculating the fingerprints of the data; matching the fingerprints of the data with the fingerprint library; if matched fingerprints exist in the fingerprint library, writing the mapping relation between the logical page and physical page of the data into an FTL (Flash Translation Layer); if no matched fingerprints exist in the fingerprint library, writing the data into the solid state disk. The invention further provides a solid state disk for implementing the method. According to the solid state disk and the method, the service life of the solid state disk can be prolonged, and space utilization ratio and speed of the solid state disk can be increased greatly.
Description
Technical field
The present invention relates to technical field of memory, relate in particular to a kind of method of solid state hard disc and deleting duplicated data thereof.
Background technology
At present, it is ripe that SSD (Solid State Disk, solid state hard disc) product has been tending towards in market, its performance at a high speed, and especially random performance also is widely known by the people, but the life problems of current solid state hard disc need to improve.The factor that affects the SSD life-span has multiple, but its basic reason is its NAND Flash program/erase number of times, and more to NAND Flash program/erase number of times, loss is larger, and the life-span is shorter.
In summary, the method for existing solid state hard disc and deleting duplicated data thereof, obviously exist inconvenience and defect, in actual use so be necessary to be improved.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of method of solid state hard disc and deleting duplicated data thereof, it can extend the serviceable life of solid state hard disc, and can greatly improve space availability ratio and the speed of solid state hard disc.
To achieve these goals, the invention provides a kind of method of solid state hard disc deleting duplicated data, described method comprises:
The fingerprint base of the data of default described solid state hard disc, described fingerprint base stores the fingerprint of described solid state hard disc data;
It is fashionable that described solid state hard disc has data to write, and calculates the fingerprint of described data;
By the fingerprint of described data and described fingerprint base matching treatment;
If the fingerprint of coupling is arranged in described fingerprint base, the mapping relations of the logical page (LPAGE) of described data and Physical Page are write to the FTL layer;
If there is no the fingerprint of coupling in described fingerprint base, described data write to described solid state hard disc.
According to the method for solid state hard disc deleting duplicated data of the present invention, described solid state hard disc is processed the finger print data in described fingerprint base by lru algorithm.
According to the method for solid state hard disc deleting duplicated data of the present invention, the fingerprint base step of the data of described default described solid state hard disc comprises:
The minimum data unit of described solid state disk read-write is set;
Calculate and preserve the fingerprint of each minimum data unit.
According to the method for solid state hard disc deleting duplicated data of the present invention, it is fashionable that described solid state hard disc has data to write, and the fingerprint step of calculating described data comprises:
Data writing is divided into to some described minimum data units, calculates the fingerprint of each described minimum data unit;
The described step by the fingerprint of described data and described fingerprint base matching treatment comprises:
By the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base.
According to the method for solid state hard disc deleting duplicated data of the present invention, described minimum data unit is data page;
The fingerprint of described data calculates and obtains described minimum data unit by hash, verification or cryptographic algorithm.
The present invention also provides a kind of solid state hard disc, comprising:
Fingerprint base arranges module, and for the fingerprint base of the data of default described solid state hard disc, described fingerprint base stores the fingerprint of described solid state hard disc data;
The fingerprint computing module, have data to write for described solid state hard disc fashionable, calculates the fingerprint of described data;
The fingerprint matching module, for the fingerprint by described data and described fingerprint base matching treatment;
Data processing module, while for described fingerprint base, the fingerprint of coupling being arranged, write the FTL layer by the mapping relations of the logical page (LPAGE) of described data and Physical Page; And/or for described fingerprint base do not have the coupling fingerprint the time, described data are write to described solid state hard disc.
According to solid state hard disc of the present invention, described solid state hard disc also comprises algorithm processing module, for process the fingerprint of described fingerprint base by lru algorithm.
According to solid state hard disc of the present invention, described fingerprint base arranges module and comprises:
Submodule is set, for the minimum data unit of described solid state disk read-write is set;
Calculating sub module, for calculating and preserve the fingerprint of each minimum data unit.
According to solid state hard disc of the present invention, described fingerprint computing module is further used for data writing is divided into to some described minimum data units, and calculates the fingerprint of each described minimum data unit;
Described fingerprint matching module is further used for the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base.
According to solid state hard disc of the present invention, described minimum data unit is data page;
The fingerprint of described data calculates and obtains described minimum data unit by hash, verification or cryptographic algorithm.
The present invention is by the fingerprint base of the data of default described solid state hard disc, this fingerprint base stores the fingerprint of solid state hard disc data, when solid state hard disc, to have data to write fashionable, calculate the fingerprint of described data, and judge in described fingerprint base the fingerprint whether had with described Data Matching, if the fingerprint of coupling is arranged in described fingerprint base, the mapping relations of the logical page (LPAGE) of described data and Physical Page are write to the FTL layer; If there is no the fingerprint of coupling in described fingerprint base, described data write to described solid state hard disc.Whereby, the present invention can extend the serviceable life of solid state hard disc, and can greatly improve space availability ratio and the speed of solid state hard disc.
The accompanying drawing explanation
Fig. 1 is the structural representation of the solid state hard disc of one embodiment of the invention;
Fig. 2 is the structural representation of the solid state hard disc of another embodiment of the present invention;
Fig. 3 is the method for the solid state hard disc deleting duplicated data of one embodiment of the invention;
Fig. 4 is the method for the solid state hard disc deleting duplicated data of another embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, the invention provides a kind of solid state hard disc, this solid state hard disc 100 comprises that fingerprint base arranges module 10, fingerprint computing module 20, fingerprint matching module 30 and data processing module 40, wherein:
Fingerprint base arranges module 10, and for the fingerprint base of the data of default described solid state hard disc 100, this fingerprint base stores the fingerprint of described solid state hard disc 100 data.Store the data of its application in the NAND Flash of solid state hard disc 100, each data are stored with the unit preset, and are stored as unit such as take page, or take piece and stored as unit.Fingerprint base arranges module 10 can carry out fingerprint calculating to these unit datas, the fingerprint that different unit datas is corresponding different.Described fingerprint base can be kept in the fixedly retaining space of solid state hard disc 100, and space size is calculated and obtained by the amount of capacity of fingerprint algorithm and solid state hard disc 100, and by firmware predistribution, invisible to the user.
Referring to Fig. 2, the solid state hard disc that another embodiment of the present invention provides, in this embodiment, solid state hard disc 100 also is provided with algorithm processing module 50, for process the fingerprint of described fingerprint base by lru algorithm.
In the actual use of solid state hard disc, the fingerprint in fingerprint base can increase gradually, also will bring the fingerprint base space hold more, and the slack-off drawback of fingerprint matching process.For this problem, the principle of dividing in conjunction with repeating data in application sixteen, only there are 20% data to have the probability of repetition, the present invention replaces processing by the fingerprint in 50 pairs of fingerprint bases of algorithm processing module, by the easiest repeating data, corresponding fingerprint is stayed in fingerprint base, replace out fingerprint base to being not easy fingerprint corresponding to repeating data, and guarantee only to take a small amount of SSD retaining space.
Further, described fingerprint base arranges module 10 and comprises:
Submodule 11 is set, for the minimum data unit of described solid state hard disc 100 read-writes is set.Submodule 11 is set, and by data, with certain granularity division, (this example be take NAND Flash page as unit, as 4K), that supposes that application layer writes all take page as unit, as non-page in the reality application is unit, data can be take to page as the unit fractionation, a data page is the minimum data unit.
Calculating sub module 12, for calculating and preserve the fingerprint of each minimum data unit, the fingerprint of described data calculates and obtains its data page by hash, verification or cryptographic algorithm.
Preferably, described fingerprint computing module 20 is further used for data writing is divided into to some described minimum data units, and to have data to write fashionable for solid state hard disc 100, writes by page, and calculate the fingerprint of each described minimum data unit.
Described fingerprint matching module 30 is further used for the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base.
In a specific embodiment of the present invention, to data writing D1, calculating its fingerprint is F1, now in fingerprint base without fingerprint, it fails to match, notice FTL layer is processed in normal IO mode, after FTL completes and writes, its fingerprint F1 and corresponding Physical Page PP1 are write to fingerprint base.When data writing D2, calculating its fingerprint is f1, the query fingerprints storehouse, and the match is successful, and the mapping relations of notifying FTL only to write this logical page (LPAGE) and Physical Page PP1 get final product, and can save storage area whereby, reduce the erasing times of its Flash, improve its serviceable life.
Referring to Fig. 3, the invention provides a kind of method of solid state hard disc deleting duplicated data, they can be by solid state hard disc 100 realizations as shown in Figure 1, and the method comprises:
Step S301, the fingerprint base of the data of default described solid state hard disc 100, this fingerprint base stores the fingerprint of described solid state hard disc 100 data.Store the data of its application in the NAND Flash of solid state hard disc 100, each data are stored with the unit preset, and are stored as unit such as take page, or take piece and stored as unit.Fingerprint base arranges module 10 can carry out fingerprint calculating to these unit datas, the fingerprint that different unit datas is corresponding different.Described fingerprint base can be kept in the fixedly retaining space of solid state hard disc 100, and space size is calculated and obtained by the amount of capacity of fingerprint algorithm and solid state hard disc 100, and by firmware predistribution, invisible to the user.
Step S302, it is fashionable that described solid state hard disc 100 has data to write, and calculates the fingerprint of described data.Fingerprint of the present invention is to adopt specific fingerprint algorithm, such as Hash, encryption and check scheduling algorithm calculate and obtain data unit, and the completing before solid state hard disc 100 is transferred to the FTL layer by data of this calculating.
Step S303, by the fingerprint of described data and described fingerprint base matching treatment.Data, before transferring to the processing of FTL layer, are searched the fingerprint in fingerprint base, and whether the fingerprint identical with described data is arranged, if fingerprint is identical, illustrates in solid state hard disc 100 and store the data identical with the data that write, and transfer to data processing module 40 and process.
Step S304, when the fingerprint of coupling is arranged in described fingerprint base, the mapping relations of the logical page (LPAGE) of described data and Physical Page are write to the FTL layer,, only need that the mapping relations of these data are write to the FTL layer and preserved, in actual applications, if use this data, directly by these mapping relations, call related data, and need not distribute new physical region to store this data.
Step S305, while there is no the fingerprint of coupling in described fingerprint base, data processing module 40 writes described solid state hard disc 100 by data, according to the mode of normal IO, consigning to the FTL layer is processed, comprise the operations such as mapping that distribute Physical Page, record logical page (LPAGE) and address page, and the fingerprint of data is write to described fingerprint base.
Again referring to Fig. 4, another embodiment of the present invention, it can realize by solid state hard disc 100 as shown in Figure 2, the method comprises:
Step S401, arrange the minimum data unit of described solid state disk read-write.By data, with certain granularity division, (this example be take NAND Flash page as unit in the present invention, as 4K), that supposes that application layer writes all take page as unit, as non-page in the reality application is unit, data can be take to page as the unit fractionation, a data page is the minimum data unit.
Step S402, calculate and preserve the fingerprint of each minimum data unit.The fingerprint of described data calculates and obtains its data page by hash, verification or cryptographic algorithm.
Step S403, be divided into some described minimum data units by data writing, calculates the fingerprint of each described minimum data unit.
Step S404, by the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base, if there is the fingerprint of coupling to perform step S405, otherwise execution step S406.
Step S405, write the FTL layer by the mapping relations of the logical page (LPAGE) of described data and Physical Page.In actual applications, if use this data, directly by these mapping relations, call related data, and need not distribute new physical region to store this data.
Step S406, write described solid state hard disc by described data.If there is no the fingerprint of coupling in described fingerprint base, data processing module 40 writes described solid state hard disc by data, according to the mode of normal IO, consigning to the FTL layer is processed, comprise the operations such as mapping that distribute Physical Page, record logical page (LPAGE) and address page, and the fingerprint of described data is write to fingerprint base.
Step S407, process the finger print data in described fingerprint base by lru algorithm.This step can keep the capacity of fingerprint base, makes it can not take very large space.
In sum, the present invention is by the fingerprint base of the data of default described solid state hard disc, this fingerprint base stores the fingerprint of solid state hard disc data, when solid state hard disc, to have data to write fashionable, calculate the fingerprint of described data, and judge in described fingerprint base the fingerprint whether had with described Data Matching, if the fingerprint of coupling is arranged in described fingerprint base, the mapping relations of the logical page (LPAGE) of described data and Physical Page are write to the FTL layer; If there is no the fingerprint of coupling in described fingerprint base, described data write to described solid state hard disc.Whereby, the present invention can extend the serviceable life of solid state hard disc, and can greatly improve space availability ratio and the speed of solid state hard disc.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. the method for a solid state hard disc deleting duplicated data, is characterized in that, described method comprises:
The fingerprint base of the data of default described solid state hard disc, described fingerprint base stores the fingerprint of described solid state hard disc data;
It is fashionable that described solid state hard disc has data to write, and calculates the fingerprint of described data;
By the fingerprint of described data and described fingerprint base matching treatment;
If the fingerprint of coupling is arranged in described fingerprint base, the mapping relations of the logical page (LPAGE) of described data and Physical Page are write to the FTL layer;
If there is no the fingerprint of coupling in described fingerprint base, described data write to described solid state hard disc, and the fingerprint of described data is write to described fingerprint base.
2. the method for solid state hard disc deleting duplicated data according to claim 1, is characterized in that, described solid state hard disc is processed the finger print data in described fingerprint base by lru algorithm.
3. the method for solid state hard disc deleting duplicated data according to claim 1, is characterized in that, the fingerprint base step of the data of described default described solid state hard disc comprises:
The minimum data unit of described solid state disk read-write is set;
Calculate and preserve the fingerprint of each minimum data unit.
4. the method for solid state hard disc deleting duplicated data according to claim 3, is characterized in that, it is fashionable that described solid state hard disc has data to write, and the fingerprint step of calculating described data comprises:
Data writing is divided into to some described minimum data units, calculates the fingerprint of each described minimum data unit;
The described step by the fingerprint of described data and described fingerprint base matching treatment comprises:
By the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base.
5. according to the method for the described solid state hard disc deleting duplicated data of claim 3 or 4, it is characterized in that, described minimum data unit is data page;
The fingerprint of described data calculates and obtains described minimum data unit by hash, verification or cryptographic algorithm.
6. a solid state hard disc, is characterized in that, comprising:
Fingerprint base arranges module, and for the fingerprint base of the data of default described solid state hard disc, described fingerprint base stores the fingerprint of described solid state hard disc data;
The fingerprint computing module, have data to write for described solid state hard disc fashionable, calculates the fingerprint of described data;
The fingerprint matching module, for the fingerprint by described data and described fingerprint base matching treatment;
Data processing module, while for described fingerprint base, the fingerprint of coupling being arranged, write the FTL layer by the mapping relations of the logical page (LPAGE) of described data and Physical Page; And/or for described fingerprint base do not have the coupling fingerprint the time, described data are write to described solid state hard disc, and the fingerprint of described data are write to described fingerprint base.
7. solid state hard disc according to claim 6, is characterized in that, described solid state hard disc also comprises algorithm processing module, for process the fingerprint of described fingerprint base by lru algorithm.
8. solid state hard disc according to claim 6, is characterized in that, described fingerprint base arranges module and comprises:
Submodule is set, for the minimum data unit of described solid state disk read-write is set;
Calculating sub module, for calculating and preserve the fingerprint of each minimum data unit.
9. solid state hard disc according to claim 8, is characterized in that, described fingerprint computing module is further used for data writing is divided into to some described minimum data units, and calculate the fingerprint of each described minimum data unit;
Described fingerprint matching module is further used for the minimum data unit's matching treatment in the fingerprint of the minimum data unit of described data and described fingerprint base.
10. solid state hard disc according to claim 8 or claim 9, is characterized in that, described minimum data unit is data page;
The fingerprint of described data calculates and obtains described minimum data unit by hash, verification or cryptographic algorithm.
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| CN105260133A (en) * | 2015-09-22 | 2016-01-20 | Tcl移动通信科技（宁波）有限公司 | Data writing method and system for EMMC (Embedded Multi Media Card) of mobile terminal |
| CN105824576A (en) * | 2015-01-23 | 2016-08-03 | 国际商业机器公司 | Deduplication tracking method and system for accurate lifespan prediction |
| CN107391391A (en) * | 2017-07-19 | 2017-11-24 | 深圳大普微电子科技有限公司 | The method, system and solid state hard disc of data copy are realized in the FTL of solid state hard disc |
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| CN109388332A (en) * | 2017-08-04 | 2019-02-26 | 群联电子股份有限公司 | Date storage method, memorizer control circuit unit and memory storage apparatus |
| CN109446117A (en) * | 2018-09-06 | 2019-03-08 | 杭州电子科技大学 | A kind of solid state hard disk page grade flash translation layer (FTL) design method |
| CN110659472A (en) * | 2019-09-29 | 2020-01-07 | 苏州浪潮智能科技有限公司 | Password card and data storage system |
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| CN105260133A (en) * | 2015-09-22 | 2016-01-20 | Tcl移动通信科技（宁波）有限公司 | Data writing method and system for EMMC (Embedded Multi Media Card) of mobile terminal |
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| CN107391391A (en) * | 2017-07-19 | 2017-11-24 | 深圳大普微电子科技有限公司 | The method, system and solid state hard disc of data copy are realized in the FTL of solid state hard disc |
| CN109388332A (en) * | 2017-08-04 | 2019-02-26 | 群联电子股份有限公司 | Date storage method, memorizer control circuit unit and memory storage apparatus |
| CN108427538A (en) * | 2018-03-15 | 2018-08-21 | 深信服科技股份有限公司 | Storage data compression method, device and the readable storage medium storing program for executing of full flash array |
| CN109446117A (en) * | 2018-09-06 | 2019-03-08 | 杭州电子科技大学 | A kind of solid state hard disk page grade flash translation layer (FTL) design method |
| CN109446117B (en) * | 2018-09-06 | 2023-02-28 | 杭州电子科技大学 | Design method for page-level flash translation layer of solid state disk |
| CN110659472A (en) * | 2019-09-29 | 2020-01-07 | 苏州浪潮智能科技有限公司 | Password card and data storage system |
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