CN102609370B - Solid-state disk and method for preventing data loss thereof - Google Patents
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Abstract
The invention provides a solid-state disk and a method for preventing data loss thereof, which are applicable to the technical field of memory. The method includes steps: writing a plurality of data of a plurality of coupling physical pages into the corresponding coupling physical pages respectively in a matrix crossing manner. The coupling physical pages which are required to be written into the solid-state disk belong to a plurality of different independent redundant disk array protecting areas respectively. By the aid of the method, data loss of the solid-state disk is prevented, and the performances of the solid-state disk are improved.
Description
Technical field
The present invention relates to technical field of memory, particularly relate to a kind of method and the solid state hard disc thereof that prevent solid state hard disc loss of data.
Background technology
The development of NAND Flash (internal memory) is just trending towards having higher density, so except except the continuous renewal of technique, each Cell also will have more bit numbers, i.e. MLC (Multi-Level Cell, multilevel-cell).But due to the inherent technology characteristic of MLC Flash, the loss of data caused because of unexpected power down, being stubborn problem the most in SSD (Solid State Disk, solid state hard disc) technical development, is also problem the most serious always.Especially, in enterprise-level product, this mistake is normally unacceptable.
Inner at MLC, each cell unit can represent multiple bit value (modal value is 2), and this multiple bit value belongs to the multiple pages in a block.Namely multiple page is real in have shared the cell unit of one group of physics.It is the coupling page in the pass of the page set sharing one group of physics cell.For two coupling pages, what sequence number was little can be called the low page, otherwise can be called the high page.
When the unexpected power down scene of system: system may carry out the operation read or write, and the former is not because cause data change to hard disk itself, so have no effect.But the latter is owing to attempting the amount of charge of change NAND a certain group of Cell to desired value.The unexpected generation of power down, causes the change of electric charge not complete.Cause its coupling content of pages value to make a mistake.Described phenomenon is powered-off fault in system end presentation, and mistake has also appearred in the low page of coupling of the high page causing system writing.Thus cause the loss of data that cannot retrieve.Nearly all solid state hard disc is due to the consideration of performance requirement, capital writes the NAND page multiple in NAND array simultaneously, this unexpected power down then can cause multiple high page normally to complete, thus causes the loss of data that the low page of multiple correspondence cannot recover.
The scene of the loss of data under non-power-failure pattern: when the high page operation of normal write makes a mistake, except just writing the mistake of the high page, its low page data that is coupled also lost simultaneously.Due in buffer memory at this moment, previous page data owing to putting far apart from current write, and correctly completes already and has been released.So this mistake also cannot be recovered.
The mistake of any one page among all pages that RAID (Redundant Array of Independent Disk, raid-array) technology can have efficient recovery to belong in RAID set.In present enterprise-level product, current techique scheme introduces the external hardware devices such as bulky capacitor mostly, guarantees to write to occur capacitances to supply power can be relied on to maintain correctly terminating of current write under power-down conditions simultaneously.The first scheme exist three large problems: first, bulky capacitor is due to its intrinsic attenuation characteristic, and after a certain period of use time, its capacitance can sharply decline, even can deficiency the initial stage 1/5.So be used as powered-off fault protection and unreliable from the method for a long time.Secondly, owing to all have employed the mode of NAND (flash memory) array parallel processing, also need to select huger value at capacitor's capacity, usually all can in farad rank.Instantly, the capacitance technology of farad rank is very unripe, if consider the problem of first more above, initial stage capacitance will be a very large problem, and even cannot reach, in addition the cost of capacitor element own, volume is also all the problem that cannot avoid.Finally, for the mistake that the second scene causes due to write error, capacitor element is helpless.
In addition also have another kind of One common solution, in normal writing process, additionally look for a backup to write again again to all pages that may be destroyed simultaneously.The data retrieving will damaged from backup when an error occurs.There is a problem equally in first scheme: although the program can solve as above all problems, and not enough place is that backup writes with original value simultaneously, directly causes write performance to be lost, and writes amplification increase, causes solid-state disk service life to shorten.
In summary, in actual use, obviously there is inconvenience and defect, so be necessary to be improved in the existing technology preventing loss of data.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of method and the solid state hard disc thereof that prevent solid state hard disc loss of data, to prevent solid state hard disc loss of data, improve the performance of solid state hard disc.
To achieve these goals, the invention provides a kind of method preventing solid state hard disc loss of data, described method comprises the steps:
Corresponding described multiple coupling physical pages are write respectively by needing the mode of the multiple data acquisition matrixes intersection write writing the multiple coupling physical pages in solid state hard disc;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively.
According to described method, describedly will multiple data acquisition matrixes of the multiple coupling physical pages write in solid state hard disc be needed to intersect writing mode, comprise before writing the step of corresponding described multiple coupling physical pages respectively:
According to the order of the described solid state hard disc data of write, judge the attribute needing the coupling physical page of the described solid state hard disc writing described data;
Describedly will multiple data acquisition matrixes of the multiple coupling physical pages write in solid state hard disc be needed to intersect writing mode, the step writing corresponding described multiple coupling physical pages respectively comprises:
Determine that described data write the path of described coupling physical page according to the attribute of described coupling physical page;
According to described path, described data are write described coupling physical page;
The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data.
According to described method, described data write the path of the high page of described coupling for write the high page of described coupling in the horizontal direction;
The path that described data write the low page of described coupling is that the path path direction at an angle writing the described high page that is coupled with described data writes the low page of described coupling;
And when described data are written to the coupling physical page in the lower right corner of the matrix of multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
According to described method, the described order according to the described solid state hard disc data of write, judges to need the step of the attribute of the coupling physical page of the described solid state hard disc writing described data to comprise:
Receive the coupling physical page instruction described data being write described solid state hard disc;
Described coupling physical page is searched according to described instruction;
Judge the attribute of described coupling physical page;
Described write the step of described solid state hard disc data according to described path after comprise:
When the described error in data of write occurs the described coupling low page, the multiple coupling pages finding the described error in data of the described coupling of impact low page generation write carry out raid-array error correction.
According to described method, between described multiple different raid-array protection zone, only include an intersection point.
In order to realize another goal of the invention of the present invention, present invention also offers a kind of solid state hard disc, comprising:
Writing module, for will the data acquisition matrix of the multiple coupling physical pages write in described solid state hard disc be needed to intersect writing mode, writes corresponding described multiple coupling physical pages respectively;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively.
According to described solid state hard disc, described solid state hard disc also comprises:
Judge module, for the order according to the described solid state hard disc data of write, judges the attribute of the coupling physical page of the described solid state hard disc needing write;
Said write module comprises:
Submodule is determined in path, for determining that described data write the path of described coupling physical page according to the attribute of described coupling physical page;
Described data, for according to described path, are write described coupling physical page by write submodule;
The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data.
According to described solid state hard disc, described data write the path of the high page of described coupling for write the high page of described coupling in the horizontal direction;
The path that described data write the low page of described coupling is that the path writing the described high page that is coupled with described data writes the low page of described coupling at an angle;
And when described data are written to the coupling physical page in the lower right corner of the matrix of multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
According to described solid state hard disc, described judge module comprises:
Receive submodule, for receiving the coupling physical page instruction described data being write described solid state hard disc;
Search submodule, for searching described coupling physical page according to described instruction;
Judge submodule, for judging the attribute of described coupling physical page;
Described solid state hard disc also comprises:
Correction module, for when the described error in data of write occurs the described coupling low page, the multiple coupling pages finding the described error in data of the described coupling of impact low page generation write carry out raid-array error correction.
According to described solid state hard disc, between described multiple different raid-array protection zone, only include an intersection point.
The present invention, by the data acquisition matrix of the multiple coupling physical pages needed in write solid state hard disc being intersected writing mode, writes corresponding described multiple coupling physical pages respectively; Adopt matrix form to intersect to write, ensure that the coupling page of all pages in every bar raid-array protection set district is all in respective different redundant array of inexpensive disk protection collection area all the time.The coupling page of all pages in the set of each raid-array protection zone is gathered with the described all raid-array protection zones be coupled belonging to the page and is only had an intersection point at the most.Can realize losing the low page data of the common multiple couplings caused due to powered-off fault of solid state hard disc; Or the mistake that the low page data of multiple couplings caused due to normal multiple page write error is lost is carried out free correction and is recovered; Without extra by risk, without the need to carrying out backup protection in advance, and adopting full tunnel maximum effective bandwidth when can accomplish write solid state hard disc, improve the efficiency of write data, and preventing solid state hard disc loss of data, improve the performance of solid state hard disc.
Accompanying drawing explanation
Fig. 1 be first embodiment of the invention provide the structural representation of solid state hard disc;
Fig. 2 is the structural representation of the solid state hard disc that second embodiment of the invention provides;
Fig. 3 is the data write path schematic diagram of the solid state hard disc in one embodiment of the invention;
Fig. 4 is the structural representation of the solid state hard disc that third embodiment of the invention provides;
Fig. 5 is the method flow diagram preventing solid state hard disc loss of data that fourth embodiment of the invention provides;
Fig. 6 is the method flow diagram carrying out raid-array error correction that one embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
See Fig. 1, provide a kind of solid state hard disc 100 in the first embodiment of the present invention, comprising:
Writing module 10, for the data acquisition matrix of the multiple coupling physical pages needed in write solid state hard disc 100 being intersected writing mode, writes corresponding described multiple coupling physical pages respectively;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively.
In this example, solid state hard disc 100 has based on the distinctive protection mechanism of RAID, by means of only doing specific matrix form arrangement to write sequence, namely reaches available protecting coupling physical page data, maintains that solid state hard disc 100 is the highest effectively writes bandwidth.Wherein the data acquisition matrix of multiple coupling physical page intersects writing mode, the matrix form that claimed risk zones adopts (x*x) to write.And described multiple coupling physical page belongs to multiple different raid-array protection zone respectively.Further, an intersection point is only included at most between multiple different raid-array protection zone.Like this; when the height page such as intercoupled belongs to different protected locations; when the data of the low page make a mistake if be coupled, the recovery of data can be realized by the coupling page of the correspondence of other raid-array protection zones, prevent the loss of data of solid state hard disc 100.
See Fig. 2, in the second embodiment of the present invention, solid state hard disc 100 also comprises:
Judge module 20, for the order according to write solid state hard disc 100 data, judges the attribute needing the coupling physical page of the solid state hard disc 100 writing described data;
Writing module 10 comprises:
Submodule 11 is determined in path, for determining that described data write the path of described coupling physical page according to the attribute of described coupling physical page;
Described data, for according to described path, are write described coupling physical page by write submodule 12;
The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data.
In this embodiment, judged by the attribute of judge module 20 to the coupling physical page that will write data, when next step write data, can write according to different predefined paths according to different attributes.Such as, the data write path of the be coupled high page and the low page of coupling is matrix cross-like, and concrete path arranges and can set with the value volume and range of product of the low page of coupling by the high page according to different couplings.Can comprise a lot of the high pages of coupling and the low page of coupling in solid state hard disc 100, the write of these page datas can according to the matrix writing mode of multiple lines and multiple rows.
See Fig. 3, in this embodiment, comprise X data block, there is X data write passage.The Dark grey page is the high page of coupling; The light grey page is the low page of coupling.Described data write the path of the high page of described coupling for write the high page of described coupling in the horizontal direction; The path that described data write the low page of described coupling is that the path writing the described high page that is coupled with described data writes the low page of described coupling at an angle; Described certain angle can be 45 degree, and the matrix specifically set by the total amount of the be coupled high page and the low page of coupling is determined.When described data are written to the coupling physical page in the lower right corner of the matrix of multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
Be coupled the path of the high page for write the high page of described coupling in the horizontal direction, and the path that data write the low page of described coupling is that the path writing the described high page that is coupled with described data writes the low page of described coupling at an angle; Then both can belong to different raid-array protection zones.The low page of coupling can be made due to after unexpected generation loss of data, and data can be recovered.
See Fig. 4, in the third embodiment of the present invention, judge module 20 comprises:
Receive submodule 21, for receiving the coupling physical page instruction of described data write solid state hard disc 100;
Search submodule 22, for searching described coupling physical page according to described instruction;
Judge submodule 23, for judging the attribute of described coupling physical page.
In this embodiment, receive the coupling physical page instruction of described data write solid state hard disc 100 by receiving submodule 21, then search submodule 22 and search the described coupling physical needing to write data according to this instruction, judge that submodule 23 judges the attribute of described coupling physical page, as belonged to the high page of coupling or the low page that is coupled.
Solid state hard disc 100 also comprises:
Correction module 30, for when the described error in data of write occurs the described coupling low page, the multiple coupling pages finding the described error in data of the described coupling of impact low page generation write carry out raid-array error correction.When the described error in data of write occurs the low page that is coupled, correction module 30 carries out date restoring by RAID technique, ensure that the completing property of data, improves the performance that solid state hard disc 100 writes data.
See Fig. 5, the fourth embodiment of the present invention provides a kind of method preventing solid state hard disc loss of data, and described method comprises the steps:
In step S501, writing module 10 writes corresponding described multiple coupling physical pages respectively by needing the mode of the multiple data acquisition matrixes intersection write writing the multiple coupling physical pages in solid state hard disc 100;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively.
In this embodiment, RAID technique is utilized to be the basis preventing solid state hard disc 100 loss of data, only change mode during data write, one or more coupling physical page can be solved well, as be coupled the high page because of unexpected power down or write error one or more coupling physical page of causing, as the problem that the low page data that is coupled is lost.Compared with existing scheme, neither increase hardware cost and complicated power management module thereof, do not need again to sacrifice write bandwidth, risk area data are additionally backed up, increases and write amplification.Take into account and reduced costs, reduced design complexities, maintained most high write performance, extension device life-span and the defect efficiently solved as stated in the Background Art.
Comprise before step S501: judge module 20, according to the order of write solid state hard disc 100 data, judges the attribute needing the coupling physical page of the solid state hard disc 100 writing described data;
Step S501 comprises: path determines according to the attribute of described coupling physical page, submodule 11 determines that described data write the path of described coupling physical page; The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; And
Described data, according to described path, are write described coupling physical page by write submodule 12; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data.
In one embodiment of the invention, write submodule 12 writes described data and writes the path of the high page of described coupling for write the high page of described coupling in the horizontal direction; The path that described data write the low page of described coupling is that the path path direction at an angle writing the described high page that is coupled with described data writes the low page of described coupling; And when described data are written to the coupling physical page in the lower right corner of the matrix of multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
See Fig. 3, a kind of page number that is coupled shown in this figure is the example of 2, and the Dark grey page and the light grey page are coupled the page each other.During normal write: the Dark grey page presses horizontal direction as its RAID protected location.The light grey page carries out RAID protection by 45 degree of oblique line directions.So run into matrix limit to be then returned to passage 1 and to continue along 45 degree downwards.Only need according to faulty page when making a mistake, all pages finding it to affect, implement RAID error correction, then can recover data.
In the order of judge module 20 according to write solid state hard disc 100 data, judge to need the step of the attribute of the coupling physical page of the solid state hard disc 100 writing described data to comprise:
Receiving submodule 21 receives the coupling physical page instruction of described data write solid state hard disc 100;
Search submodule 22 and search described coupling physical page according to described instruction;
Judge that submodule 23 judges the attribute of described coupling physical page.
Comprise after write submodule 12 is according to the step of described path write solid state hard disc 100 data:
Correction module 30 is when there is the described error in data of write in the low page of described coupling, and the multiple coupling pages finding the described error in data of the described coupling of impact low page generation write carry out raid-array error correction.
In this embodiment, adopt based on any one NAND in RAID method realization protection solid state hard disc 100.Already become main trend at current solid state hard disc, and become the prerequisite function of enterprise-level product with the propelling of NAND technique.When arbitrary NAND particle is damaged, the data on solid state hard disc 100 still can completely be resumed as before.
See Fig. 6, for one provided by the invention is mistaken at discovery data write error, carry out the embodiment of raid-array error correction, in this embodiment, have two pages be coupled each other, if wherein in step S601, the low page that is coupled makes a mistake; In step S602, forward the coupling page 1 of the low page that is coupled to; In step S603, carry out the RAID error correction of coupling page 1; In step S604, forward the coupling page 2 of the low page that is coupled to; In step S605, carry out the RAID error correction of coupling page 2.
In sum, the present invention, by the data acquisition matrix of the multiple coupling physical pages needed in write solid state hard disc being intersected writing mode, writes corresponding described multiple coupling physical pages respectively; Adopt matrix form to intersect to write, ensure that the coupling page of all pages in every bar raid-array protection set district is all in respective different redundant array of inexpensive disk protection collection area all the time.The coupling page of all pages in the set of each raid-array protection zone is gathered with the described all raid-array protection zones be coupled belonging to the page and is only had an intersection point at the most.Can realize losing the low page data of the common multiple couplings caused due to powered-off fault of solid state hard disc; Or the mistake that the low page data of multiple couplings caused due to normal multiple page write error is lost is carried out free correction and is recovered; Without extra by risk, without the need to carrying out backup protection in advance, and adopting full tunnel maximum effective bandwidth when can accomplish write solid state hard disc, improve the efficiency of write data, and preventing solid state hard disc loss of data, improve the performance of solid state hard disc.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (6)
1. prevent a method for solid state hard disc loss of data, it is characterized in that, described method comprises the steps:
Corresponding described multiple coupling physical pages are write respectively by needing the mode of the multiple data acquisition matrixes intersection write writing the multiple coupling physical pages in solid state hard disc;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively;
Describedly will multiple data acquisition matrixes of the multiple coupling physical pages write in solid state hard disc be needed to intersect writing mode, comprise before writing the step of corresponding described multiple coupling physical pages respectively:
According to the order of the described solid state hard disc data of write, judge the attribute needing the coupling physical page of the described solid state hard disc writing described data;
Describedly will multiple data acquisition matrixes of the multiple coupling physical pages write in solid state hard disc be needed to intersect writing mode, the step writing corresponding described multiple coupling physical pages respectively comprises:
Determine that described data write the path of described coupling physical page according to the attribute of described coupling physical page;
According to described path, described data are write described coupling physical page;
The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data;
The path that described data write the high page of described coupling is that the horizontal direction of the matrix formed along multiple data block writes the high page of described coupling;
The path that described data write the low page of described coupling is that the path path direction at an angle writing the described high page that is coupled with described data writes the low page of described coupling, and the matrix of described angle set by the total amount of the high page of described coupling and the low page of described coupling is determined;
And when described data are written to the coupling physical page in the lower right corner of the described matrix of described multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
2. method according to claim 1, is characterized in that, the described order according to the described solid state hard disc data of write, judges to need the step of the attribute of the coupling physical page of the described solid state hard disc writing described data to comprise:
Receive the coupling physical page instruction described data being write described solid state hard disc;
Described coupling physical page is searched according to described instruction;
Judge the attribute of described coupling physical page;
Described write the step of described solid state hard disc data according to described path after comprise:
When the described error in data of write occurs the described coupling low page, find multiple coupling pages that the described error in data of write occurs the described coupling of the impact low page, raid-array error correction is carried out to described multiple coupling page.
3. method according to claim 1; it is characterized in that, the coupling page of all pages in the set of described each raid-array protection zone is gathered with the described all raid-array protection zones be coupled belonging to the page and is only had an intersection point at the most.
4. a solid state hard disc, is characterized in that, comprising:
Writing module, for will the data acquisition matrix of the multiple coupling physical pages write in described solid state hard disc be needed to intersect writing mode, writes corresponding described multiple coupling physical pages respectively;
Described multiple coupling physical page belongs to multiple different raid-array protection zone respectively;
Described solid state hard disc also comprises:
Judge module, for the order according to the described solid state hard disc data of write, judges the attribute of the coupling physical page of the described solid state hard disc needing write;
Said write module comprises:
Submodule is determined in path, for determining that described data write the path of described coupling physical page according to the attribute of described coupling physical page;
Described data, for according to described path, are write described coupling physical page by write submodule;
The attribute of described coupling physical page is the high page of coupling or the low page that is coupled; It is matrix cross-like that the path that described data write the high page of described coupling writes the described path being coupled the low page with described data;
The path that described data write the high page of described coupling is that the horizontal direction of the matrix formed along multiple data block writes the high page of described coupling;
The path that described data write the low page of described coupling is that the path writing the described high page that is coupled with described data writes the low page of described coupling at an angle, and the matrix of described angle set by the total amount of the high page of described coupling and the low page of described coupling is determined;
And when described data are written to the coupling physical page in the lower right corner of the described matrix of described multiple data block compositions at multiple described coupling physical page place, the coupling physical page returning to the upper left corner of described matrix continues the described data of write.
5. solid state hard disc according to claim 4, is characterized in that, described judge module comprises:
Receive submodule, for receiving the coupling physical page instruction described data being write described solid state hard disc;
Search submodule, for searching described coupling physical page according to described instruction;
Judge submodule, for judging the attribute of described coupling physical page;
Described solid state hard disc also comprises:
Correction module, for when the described error in data of write occurs the described coupling low page, finds multiple coupling pages that the described error in data of write occurs the described coupling of the impact low page, carries out raid-array error correction to described multiple coupling page.
6. solid state hard disc according to claim 4; it is characterized in that, the coupling page of all pages in the set of described each raid-array protection zone is gathered with the described all raid-array protection zones be coupled belonging to the page and is only had an intersection point at the most.
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| CN109460192A (en) * | 2018-11-15 | 2019-03-12 | 苏州韦科韬信息技术有限公司 | A method of preventing solid state hard disk loss of data |
| CN112764683B (en) * | 2021-01-22 | 2023-01-10 | 苏州浪潮智能科技有限公司 | Storage block management information synchronous recording method, system, terminal and storage medium |
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| CN101976576A (en) * | 2007-10-29 | 2011-02-16 | 群联电子股份有限公司 | Writing-in method of non-volatile memory and controlling using method |
| CN101681311A (en) * | 2008-02-28 | 2010-03-24 | 株式会社东芝 | Memory system |
| CN101625897A (en) * | 2008-07-11 | 2010-01-13 | 群联电子股份有限公司 | Data write-in method, storage system and controller used for quick flash memory |
| US20110228601A1 (en) * | 2010-03-17 | 2011-09-22 | Olbrich Aaron K | Mlc self-raid flash data protection scheme |
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