CN110427279A - A kind of method and system for the Raid parity data restoring to write band - Google Patents
A kind of method and system for the Raid parity data restoring to write band Download PDFInfo
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- CN110427279A CN110427279A CN201910655574.5A CN201910655574A CN110427279A CN 110427279 A CN110427279 A CN 110427279A CN 201910655574 A CN201910655574 A CN 201910655574A CN 110427279 A CN110427279 A CN 110427279A
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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
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1076—Parity data used in redundant arrays of independent storages, e.g. in RAID systems
- G06F11/108—Parity data distribution in semiconductor storages, e.g. in SSD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/10—Indexing scheme relating to G06F11/10
- G06F2211/1002—Indexing scheme relating to G06F11/1076
- G06F2211/1026—Different size groups, i.e. non uniform size of groups in RAID systems with parity
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Abstract
The present invention relates to a kind of method and system of Raid parity data for restoring to write band；Wherein, method, comprising: S1 receives the control instruction of SSD；S2 enters power-up initializing mode or safe shutdown mode according to control instruction.The present invention is in the case where need to only mend less data, the parity data for writing band can be quickly recovered after powering on, especially certain since low-power consumption SSD can frequent power-on and power-off, and it does not write under the scene of data, data will not additionally be write, the time of safety shutdown and power-up initializing is effectively reduced, SSD service life is extended, it being capable of preferably meet demand.
Description
Technical field
The present invention relates to solid state hard disk Raid technical fields, more specifically refer to a kind of Raid odd even for restoring to write band
Verify the method and system of data.
Background technique
Nand Flash (flash memory) by external working environment (such as: temperature, irradiation) and production technology, working principle, deposit
The drawbacks of storing up material itself etc. influences, and always generates mistake under various conditions；To improve SSD (solid state hard disk) data safety
Property, RAID can be increased in SSD firmware, generally use RAID5 or RAID6.
For supporting the SSD of RAID to fall since parity data is stored in memory dram (dynamic random access memory)
Electricity is lost, and after the power-up, needs to recover the incomplete parity data for writing band, and data could be allowed to continue in this way
The band is written；But be written since flash memory must comply with certain sequence of writing, if cannot recover this writes band
Parity data no longer allows to write then one group of block (physical block) used in the band must be added to queue to be moved
Enter；And the prior art generally requires to fill up excessive invalid data, especially SSD can frequent power down in the case where, lengthen booting
Initialization time has an effect on SSD service life；Therefore, it is impossible to meet demand.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of Raid even-odd check number for restoring to write band is provided
According to method and system.
To achieve the above object, the present invention is used in lower technical solution:
A method of restore to write the Raid parity data of band, comprising the following steps:
S1 receives the control instruction of SSD；
S2 enters power-up initializing mode or safe shutdown mode according to control instruction.
Its further technical solution are as follows: the power-up initializing mode the following steps are included:
A1, judge last time power down whether safety shutdown；If so, into A2；If it is not, then entering A4；
A2, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A3；
A3 initializes stripe information, band dummy parity flag is set to 1；
A4, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A5；
A5 locks one group of physical block where the band；
A6 terminates.
Its further technical solution are as follows: in the A3, further includes: the band distributes even-odd check buffer zone, and will be odd
Even parity check mark is initialized as 11b, other are initialized as 0.
Its further technical solution are as follows: in the A5, further includes: prevent to continue to write data to this group of physical block.
Its further technical solution are as follows: the safe shutdown mode the following steps are included:
B1, judgement write whether band is write completely；If so, into B8；If it is not, then entering B2；
Whether B2, the dummy parity flag that band is write in judgement are set to 1；If so, into B8；If it is not, then entering B3；
B3, band is write in judgement, and only whether surplus page of data page is not write；If so, into B4；If it is not, then entering B5；
B4, this is write band and filled by benefit invalid data, and enters B8；
B5, judgement write whether stripe parity mark is 11b；If so, into B7；If it is not, then entering B6；
Even-odd check mark is changed to 11b by B6；
B7 issues the order for writing parity data, this is written in the data in even-odd check buffer zone and writes band；
B8 terminates.
Its further technical solution are as follows: in the B6, using writing data but not practical write odd even by the way of physical block
Even-odd check mark in verification buffer zone is changed to 11b.
Its further technical solution are as follows: in the B7, further includes: release even-odd check buffer zone.
A kind of system for the Raid parity data restoring to write band, comprising: receiving unit, and enter unit；
The receiving unit, for receiving the control instruction of SSD；
It is described to enter unit, for entering power-up initializing mode or safe shutdown mode according to control instruction.
Its further technical solution are as follows: the unit that enters includes power-up initializing module and safety shutdown module；It is described
Be powered on and initialized module include the first judgment sub-unit, the second judgment sub-unit, initialize subelement, third judgment sub-unit,
Lock subelement and the first end subelement；
First judgment sub-unit, for judge last time power down whether safety shutdown；
Second judgment sub-unit is ultimately written whether band is write completely for judging；
Band dummy parity flag is set to 1 for initializing stripe information by the initialization subelement；
The third judgment sub-unit is ultimately written whether band is write completely for judging；
The latching subelement, for lockking one group of physical block where the band；
Described first terminates subelement, is used for end operation.
Its further technical solution are as follows: the safety shutdown module include the 4th judgment sub-unit, the 5th judgment sub-unit,
6th judgment sub-unit fills subelement, and the 7th judgment sub-unit modifies subelement, and subelement is written and the second end is single
Member；
4th judgment sub-unit writes whether band is write completely for judging；
5th judgment sub-unit, for judging whether the dummy parity flag for writing band is set to 1；
6th judgment sub-unit, writing band for judgement, only whether surplus page of data page is not write；
It is described to fill subelement, this is write into band for mending invalid data and is filled；
7th judgment sub-unit writes whether stripe parity mark is 11b for judging；
The modification subelement, for even-odd check mark to be changed to 11b；
Said write subelement, for issuing the order for writing parity data, by the number in even-odd check buffer zone
Band is write according to this is written；
Described second terminates subelement, is used for end operation.
Compared with the prior art, the invention has the advantages that: it, can be fast after powering in the case where need to only mend less data
Quick-recovery, which goes out, writes the parity data of band, especially it is certain due to low-power consumption SSD can frequent power-on and power-off, and do not write data
Under scene, data will not be additionally write, effectively reduce the time of safety shutdown and power-up initializing, extend SSD service life,
It being capable of preferably meet demand.
The invention will be further described in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the application schematic diagram for filling band in the prior art；
Fig. 2 is the application schematic diagram of recovery parity data after existing power on；
Fig. 3 is a kind of method flow diagram for the Raid parity data for restoring to write band of the present invention；
Fig. 4 is the flow chart that mode is powered on and initialized in the present invention；
Fig. 5 is the flow chart of safe shutdown mode in the present invention；
Fig. 6 is the application schematic diagram that rear fast quick-recovery parity data is powered in the present invention；
Fig. 7 is a kind of system block diagram for the Raid parity data for restoring to write band of the present invention.
Specific embodiment
In order to more fully understand technology contents of the invention, combined with specific embodiments below to technical solution of the present invention into
One step introduction and explanation, but not limited to this.
Such as Fig. 1 to specific embodiment shown in Fig. 7, wherein the prior art as shown in Figure 1 to Figure 2, it is assumed that use
The RAID5 of RAID SIZE (raid array size)=8 (7+1) is configured；Scheme as shown in Figure 1, meeting will not before safety shutdown
It completely writes band to fill up by way of writing invalid data completely, not have to restore even-odd check number in power-up initializing
According to can continue to write data toward one group of block (physical block) where the band, the program needs to mend in the worst case
The invalid data of RAID SIZE-2 page adds one page parity data.Due to SSD be widely used in portable and mobility compared with
In strong product, some designs for pursuing low-power consumption can allow SSD frequent power down in use, and consider OP (Over-
Provision: reserved space), readwrite performance etc., RAID SIZE cannot be too small, in this way, if continually being fallen using above scheme
Electricity will lead to the write-in of a large amount of invalid datas, influence SSD service life.Scheme as shown in Figure 2, can be before power down not to writing item
Band makees specially treated, but after the power-up reads up the incomplete data of having write for writing band page by page, carries out exclusive or
To recover parity data, need to read the data of RAID SIZE-1 page in the worst case, the program can lengthen booting just
The beginningization time.
As shown in Figures 3 to 6, the invention discloses a kind of method of Raid parity data for restoring to write band, packets
Include following steps:
S1 receives the control instruction of SSD；
S2 enters power-up initializing mode or safe shutdown mode according to control instruction.
Wherein, the power-up initializing mode the following steps are included:
A1, judge last time power down whether safety shutdown；If so, into A2；If it is not, then entering A4；
A2, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A3；
A3 initializes stripe information, band dummy parity flag (is indicated whether the band has write caching
Parity data) it is set to 1 (mark and band are bound, and current band, which is write, can completely remove the mark)；
A4, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A5；
A5 locks one group of physical block where the band；
A6 terminates.
Further, in the A3, further includes: the band distributes even-odd check buffer zone, and by even-odd check mark
It is initialized as 11b, other are initialized as 0.
Further, in the A5, further includes: prevent to continue to write data to this group of physical block.
Wherein, the safe shutdown mode the following steps are included:
B1, judgement write whether band is write completely；If so, into B8；If it is not, then entering B2；
Whether B2, the dummy parity flag that band is write in judgement are set to 1；If so, into B8；If it is not, then entering B3；
B3, band is write in judgement, and only whether surplus page of data page is not write；If so, into B4；If it is not, then entering B5；
B4, this is write band and filled by benefit invalid data, and enters B8；
B5, judgement write whether stripe parity mark is 11b；If so, into B7；If it is not, then entering B6；
Even-odd check mark is changed to 11b by B6；
B7 issues the order for writing parity data, this is written in the data in even-odd check buffer zone and writes band；
B8 terminates.
Wherein, in the B6, using writing data but not practical write will be in even-odd check buffer zone by the way of physical block
Even-odd check mark be changed to 11b.
Further, in the B7, further includes: release even-odd check buffer zone.
Wherein, in this example, it is assumed that using the RAID5 of RAID SIZE=8 (7+1) to configure, one is write band
There are the user data of page 7 to add one page parity data, as shown in fig. 6, thering is a band only to write two page datas before safety shutdown, not
It writes full；Since the temporary parity data of the page 0 and page 1 write are temporarily stored into dram, can be lost after power down, so after powering on
To continue to write data to the band, then parity data must be first recovered；Wherein, as shown in fig. 6, by even-odd check number
Page (page) 3 is written according to (parity data), 0xor pages 1 of=page of the parity data (parity data) of this before writing,
The parity data (parity data) of the band=(0xor pages 1 of page) xor (0xor pages 1 of page)=(0xor pages 0 of page) after writing
Xor (1xor pages 1 of page)=0xor 0=0
Wherein, even-odd check mark (parity flag) is whether label current page stored data is odd in above-mentioned process
Even parity check data (parity data) are used for firmware internal logic, Dummy parity flag, the flag label write-in point
Whether the data for the last page of band write are former pages of the parity datas (parity data) write, that is,
This is marked to power on the incomplete data of writing band whether crossed later toward last time safe power down process.
The present invention generates the even-odd check number of an expected full 0 by way of writing low volume data before safety shutdown
According to extending SSD service life, reduce SSD and be powered on and initialized the time.
As shown in fig. 7, the invention discloses a kind of systems of Raid parity data for restoring to write band, comprising: connect
Unit 10 is received, and enters unit 20；
The receiving unit 10, for receiving the control instruction of SSD；
It is described to enter unit 20, for entering power-up initializing mode or safe shutdown mode according to control instruction.
Wherein, the unit 20 that enters includes power-up initializing module 21 and safety shutdown module 22；It is described to power on initially
Changing module 21 includes the first judgment sub-unit 211, and the second judgment sub-unit 212 initializes subelement 213, and third judgement is single
Member 214 locks subelement 215 and the first end subelement 216；
First judgment sub-unit 211, for judge last time power down whether safety shutdown；
Second judgment sub-unit 212 is ultimately written whether band is write completely for judging；
Band dummy parity flag is set to by the initialization subelement 213 for initializing stripe information
1；
The third judgment sub-unit 214 is ultimately written whether band is write completely for judging；
The latching subelement 215, for lockking one group of physical block where the band；
Described first terminates subelement 216, is used for end operation.
Wherein, the safety shutdown module 22 includes the 4th judgment sub-unit 221, and the 5th judgment sub-unit 222, the 6th sentences
Disconnected subelement 223 fills subelement 224, and the 7th judgment sub-unit 225 modifies subelement 226, and subelement 227 and the is written
Two terminate subelement 228；
4th judgment sub-unit 221 writes whether band is write completely for judging；
5th judgment sub-unit 222, for judging whether the dummy parity flag for writing band is set to 1；
6th judgment sub-unit 223, writing band for judgement, only whether surplus page of data page is not write；
It is described to fill subelement 224, this is write into band for mending invalid data and is filled；
7th judgment sub-unit 225 writes whether stripe parity mark is 11b for judging；
The modification subelement 226, for even-odd check mark to be changed to 11b；
Said write subelement 227 will be in even-odd check buffer zone for issuing the order for writing parity data
Data are written this and write band；
Described second terminates subelement 228, is used for end operation.
Wherein, in the case where need to only mend less data, the parity data for writing band can be quickly recovered after powering on,
Especially it is certain due to low-power consumption SSD can frequent power-on and power-off, and do not write under the scene of data, will not additionally write data, effectively subtract
The time for having lacked safety shutdown and power-up initializing extends SSD service life, being capable of preferably meet demand.
It is above-mentioned that technology contents of the invention are only further illustrated with embodiment, in order to which reader is easier to understand, but not
It represents embodiments of the present invention and is only limitted to this, any technology done according to the present invention extends or recreation, by of the invention
Protection.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of method for the Raid parity data for restoring to write band, which comprises the following steps:
S1 receives the control instruction of SSD；
S2 enters power-up initializing mode or safe shutdown mode according to control instruction.
2. a kind of method of Raid parity data for restoring to write band according to claim 1, which is characterized in that institute
State power-up initializing mode the following steps are included:
A1, judge last time power down whether safety shutdown；If so, into A2；If it is not, then entering A4；
A2, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A3；
A3 initializes stripe information, band dummy parity flag is set to 1；
A4, judgement are ultimately written whether band is write completely；If so, into A6；If it is not, then entering A5；
A5 locks one group of physical block where the band；
A6 terminates.
3. a kind of method of Raid parity data for restoring to write band according to claim 2, which is characterized in that institute
It states in A3, further includes: the band distributes even-odd check buffer zone, and even-odd check mark is initialized as 11b, other are initial
Turn to 0.
4. a kind of method of Raid parity data for restoring to write band according to claim 2, which is characterized in that institute
It states in A5, further includes: prevent to continue to write data to this group of physical block.
5. a kind of method of Raid parity data for restoring to write band according to claim 1, which is characterized in that institute
State safe shutdown mode the following steps are included:
B1, judgement write whether band is write completely；If so, into B8；If it is not, then entering B2；
Whether B2, the dummy parity flag that band is write in judgement are set to 1；If so, into B8；If it is not, then entering B3；
B3, band is write in judgement, and only whether surplus page of data page is not write；If so, into B4；If it is not, then entering B5；
B4, this is write band and filled by benefit invalid data, and enters B8；
B5, judgement write whether stripe parity mark is 11b；If so, into B7；If it is not, then entering B6；
Even-odd check mark is changed to 11b by B6；
B7 issues the order for writing parity data, this is written in the data in even-odd check buffer zone and writes band；
B8 terminates.
6. a kind of method of Raid parity data for restoring to write band according to claim 5, which is characterized in that institute
It states in B6, using writing data but not practical write changes the even-odd check mark in even-odd check buffer zone by the way of physical block
For 11b.
7. a kind of method of Raid parity data for restoring to write band according to claim 5, which is characterized in that institute
It states in B7, further includes: release even-odd check buffer zone.
8. a kind of system for the Raid parity data for restoring to write band characterized by comprising receiving unit, and enter
Unit；
The receiving unit, for receiving the control instruction of SSD；
It is described to enter unit, for entering power-up initializing mode or safe shutdown mode according to control instruction.
9. a kind of system of Raid parity data for restoring to write band according to claim 8, which is characterized in that institute
It states and enters unit including being powered on and initialized module and safety shutdown module；The power-up initializing module includes that the first judgement is single
Member, the second judgment sub-unit initialize subelement, and third judgment sub-unit locks subelement and the first end subelement；
First judgment sub-unit, for judge last time power down whether safety shutdown；
Second judgment sub-unit is ultimately written whether band is write completely for judging；
Band dummy parity flag is set to 1 for initializing stripe information by the initialization subelement；
The third judgment sub-unit is ultimately written whether band is write completely for judging；
The latching subelement, for lockking one group of physical block where the band；
Described first terminates subelement, is used for end operation.
10. a kind of system of Raid parity data for restoring to write band according to claim 9, which is characterized in that
The safety shutdown module includes the 4th judgment sub-unit, the 5th judgment sub-unit, and the 6th judgment sub-unit fills subelement,
7th judgment sub-unit modifies subelement, and subelement and the second end subelement is written；
4th judgment sub-unit writes whether band is write completely for judging；
5th judgment sub-unit, for judging whether the dummy parity flag for writing band is set to 1；
6th judgment sub-unit, writing band for judgement, only whether surplus page of data page is not write；
It is described to fill subelement, this is write into band for mending invalid data and is filled；
7th judgment sub-unit writes whether stripe parity mark is 11b for judging；
The modification subelement, for even-odd check mark to be changed to 11b；
Said write subelement writes the data in even-odd check buffer zone for issuing the order for writing parity data
Enter this and writes band；
Described second terminates subelement, is used for end operation.
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