CN110729014A - Method and device for backing up erase count table in SSD (solid State disk) storage, computer equipment and storage medium - Google Patents
Method and device for backing up erase count table in SSD (solid State disk) storage, computer equipment and storage medium Download PDFInfo
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- CN110729014A CN110729014A CN201910990162.7A CN201910990162A CN110729014A CN 110729014 A CN110729014 A CN 110729014A CN 201910990162 A CN201910990162 A CN 201910990162A CN 110729014 A CN110729014 A CN 110729014A
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- erase count
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
- G11C16/14—Circuits for erasing electrically, e.g. erase voltage switching circuits
Abstract
The invention relates to a method and a device for storing an erase count table backup in an SSD, a computer device and a storage medium; the method comprises the following steps: judging whether the erasure count table is damaged or not; if so, recovering the corresponding erase count value from the first physical page of each super block; and splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table. The invention dispersedly stores each erase count value of the erase count table into the corresponding standby area of the super block which can be read and written in parallel, and can restore the backup of the erase count table by traversing all the super blocks under the condition that the erase count table is damaged so as to maintain the consistency of data.
Description
Technical Field
The invention relates to the technical field of solid state storage backup, in particular to a method and a device for backing up an SSD storage erase count table, computer equipment and a storage medium.
Background
The Nand flash memory takes a block (physical block) as an erasing unit, and when the erasing frequency (erase count) of the block exceeds a certain value, the service life of the block is up and the block can not be used any more; therefore, there is a table in SSD (solid state disk) that records the number of times each block is erased, which is called ec (erase count) table; during the running period of the SSD, the block is continuously erased, the EC value of the block is increased every time the block is erased, the EC table is updated, and the EC table is written into the Nand flash memory after being updated, so that the loss of the EC table caused by power failure can be prevented; if the EC table on the Nand flash memory is damaged due to abnormal power failure or other reasons, the SSD firmware cannot know the erasing times of each block, the current life state of the Nand flash memory cannot be judged, and finally the data consistency may be influenced; therefore, the demand cannot be satisfied.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a device for backing up an SSD storage erase count table, computer equipment and a storage medium.
In order to achieve the purpose, the invention adopts the following technical scheme:
the SSD storage erase count table backup method comprises the following steps:
judging whether the erasure count table is damaged or not;
if yes, recovering corresponding erase count values from the first physical page of each super block;
and splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table.
The further technical scheme is as follows: the super block is a group of physical blocks which can be read and written in parallel in the SSD.
The further technical scheme is as follows: in the SSD, all physical blocks are divided into a plurality of super blocks, each super block is written and erased together, each super block records an erase count value, and the erase count values of all the super blocks form an erase count table.
The further technical scheme is as follows: writing the erase count value corresponding to each super block into the spare area of the first physical page at the same time when writing the first physical page by each super block; if the erase count table on the Nand flash memory is damaged, the superblocks can acquire the erase count values of the superblocks from the standby area, the erase count values of all superblocks are completely collected together to form a new erase count table again, and the whole erase count table is backed up.
The SSD stores the device that the count table of erasing was backed up, including: the device comprises a judging unit, a recovering unit and a splicing unit;
the judging unit is used for judging whether the erasure counting table is damaged or not;
the recovery unit is used for recovering the corresponding erase count value from the first physical page of each super block;
and the splicing unit is used for splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table.
The further technical scheme is as follows: the super block is a group of physical blocks which can be read and written in parallel in the SSD.
The further technical scheme is as follows: in the SSD, all physical blocks are divided into a plurality of super blocks, each super block is written and erased together, each super block records an erase count value, and the erase count values of all the super blocks form an erase count table.
The further technical scheme is as follows: writing the erase count value corresponding to each super block into the spare area of the first physical page at the same time when writing the first physical page by each super block; if the erase count table on the Nand flash memory is damaged, the superblocks can acquire the erase count values of the superblocks from the standby area, the erase count values of all superblocks are completely collected together to form a new erase count table again, and the whole erase count table is backed up.
A computer device comprising a memory having stored thereon a computer program and a processor that, when executing the computer program, implements a method of SSD storage erase count table backup as described above.
A storage medium storing a computer program comprising program instructions which when executed by a processor may implement a method of SSD storage erase count table backup as described above.
Compared with the prior art, the invention has the beneficial effects that: by dispersedly storing each erase count value of the erase count table into the corresponding standby area of the super blocks which can be read and written in parallel, under the condition that the erase count table is damaged, the backup of the erase count table can be recovered by traversing all the super blocks, so that the consistency of data is maintained, and the requirement can be better met.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for SSD storage to store an erase count table backup according to an embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of erase count table backup according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of an apparatus for SSD storing an erase count table backup according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a computer device provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to the embodiments shown in fig. 1 to 4, wherein, referring to fig. 1 to 2, the invention discloses a method for SSD storing erase count table backup, comprising the following steps:
s1, judging whether the erasure count table is damaged; if not, ending;
s2, if yes, recovering the corresponding erase count value from the first physical page of each super block;
and S3, splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table.
The Nand flash memory is composed of a plurality of physical blocks (blocks), each physical block comprises a plurality of physical pages (pages), each physical page comprises two areas, namely a spare area and a main area, the main area is used for storing user data, and the spare area is used for storing system management data of the SSD generally.
The super block is a group of physical blocks which can be read and written in the SSD in parallel.
In the SSD, all physical blocks are divided into a plurality of super blocks, each super block is written in and erased together, the whole super block is erased together, so each super block can record an erase count value, the erase count values of all the super blocks form an erase count table, the erase count table can be written into a Nand flash memory, and if the erase count table on the Nand flash memory is damaged, the erase count value of each super block is lost.
Writing the erase count value corresponding to each super block into a spare area of a first physical page at the same time when the first physical page is written in each super block; therefore, the erase count values of all the superblocks have two backups, one of the erase count values is stored in the spare area of the superblock in the original erase count table, if the erase count table on the Nand flash memory is damaged due to abnormal power failure or other reasons, the superblocks can obtain the erase count values of the superblocks from the spare area of the superblocks, the erase count values of all the superblocks are all integrated together to form a new erase count table again, in the process of recovering the erase count table by the SSD, the erase count values of the superblocks are read out from the first physical page of the first physical block of each superblock by traversing all the superblocks, then the erase count values of all the superblocks are spliced to form a complete erase count table, and the whole erase count table can be backed up in the mode.
As shown in fig. 2, the erase count value in each entry in the erase count table is stored in the spare area of the first physical page of the corresponding super block; when writing of any superblock is started, the corresponding erase count value is written to the spare area on the first physical page of the first physical block of this superblock, and in FIG. 2, SB0_ EC is stored in the spare area on the first physical page of the first physical block of superblock0, and so on.
According to the invention, each erase count value of the erase count table is dispersedly stored in the corresponding standby area of the super block which can be read and written in parallel, and under the condition that the erase count table is damaged, the backup of the erase count table can be recovered by traversing all the super blocks, so that the consistency of data is maintained, and the requirement can be better met.
Referring to fig. 3, the present invention also discloses a device for storing and backing up an erase count table in an SSD, including: a judging unit 10, a restoring unit 20, and a splicing unit 30;
the judging unit 10 is configured to judge whether the erase count table is damaged;
the recovery unit 20 is configured to recover the corresponding erase count value from the first physical page of each super block;
the splicing unit 30 is configured to splice the erase count values of all the superblocks into a complete erase count table, so as to complete the backup of the erase count table.
The super block is a group of physical blocks which can be read and written in the SSD in parallel.
In the SSD, all physical blocks are divided into a plurality of super blocks, each super block is written and erased together, each super block records an erase count value, and the erase count values of all the super blocks form an erase count table.
Writing the erase count value corresponding to each super block into a spare area of a first physical page at the same time when the first physical page is written in each super block; if the erase count table on the Nand flash memory is damaged, the superblocks can acquire the erase count values of the superblocks from the standby area, the erase count values of all superblocks are completely collected together to form a new erase count table again, and the whole erase count table is backed up.
It should be noted that, as can be clearly understood by those skilled in the art, the above-mentioned SSD storage erase count table backup apparatus and the specific implementation process of each unit may refer to the corresponding description in the foregoing method embodiment, and for convenience and brevity of description, no further description is provided here.
The above-mentioned means for SSD storing an erase count table backup may be implemented in the form of a computer program which may be run on a computer device as shown in fig. 4.
Referring to fig. 4, fig. 4 is a schematic block diagram of a computer device according to an embodiment of the present application; the computer device 500 may be a terminal or a server, where the terminal may be an electronic device with a communication function, such as a smart phone, a tablet computer, a notebook computer, a desktop computer, a personal digital assistant, and a wearable device. The server may be an independent server or a server cluster composed of a plurality of servers.
Referring to fig. 4, the computer device 500 includes a processor 502, memory, and a network interface 505 connected by a system bus 501, where the memory may include a non-volatile storage medium 503 and an internal memory 504.
The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer programs 5032 include program instructions that, when executed, cause the processor 502 to perform a method of SSD storage erase count table backup.
The processor 502 is used to provide computing and control capabilities to support the operation of the overall computer device 500.
The memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 may be enabled to perform a method for the SSD storage erase count table backup.
The network interface 505 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 4 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation of the computer device 500 to which the present application may be applied, and that a particular computer device 500 may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
It should be understood that, in the embodiment of the present Application, the Processor 502 may be a Central Processing Unit (CPU), and the Processor 502 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program includes program instructions, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program comprises program instructions that, when executed by a processor, implement the above-described method of SSD storage erase count table backup.
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
- A method for SSD storage erase count table backup, comprising the steps of:judging whether the erasure count table is damaged or not;if yes, recovering corresponding erase count values from the first physical page of each super block;and splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table.
- 2. The method of claim 1, wherein the superblock is a set of physical blocks in the SSD that can be read and written in parallel.
- 3. The method of claim 2 wherein the SSD stores an erase count table backup in which all physical blocks are divided into super blocks, each super block being written and erased together, and each super block recording an erase count value, the erase count values of all super blocks forming an erase count table.
- 4. The method of claim 3 wherein each superblock writes its corresponding erase count value to the spare area of the first physical page at the same time as the first physical page; if the erase count table on the Nand flash memory is damaged, the superblocks can acquire the erase count values of the superblocks from the standby area, the erase count values of all superblocks are completely collected together to form a new erase count table again, and the whole erase count table is backed up.
- An apparatus for SSD storage erase count table backup, comprising: the device comprises a judging unit, a recovering unit and a splicing unit;the judging unit is used for judging whether the erasure counting table is damaged or not;the recovery unit is used for recovering the corresponding erase count value from the first physical page of each super block;and the splicing unit is used for splicing the erase count values of all the superblocks to form a complete erase count table so as to complete the backup of the erase count table.
- 6. The apparatus of claim 5, wherein the super block is a set of physical blocks in the SSD that can be read and written in parallel.
- 7. The apparatus of claim 6 wherein the SSD stores an erase count table backup, wherein all physical blocks in the SSD are divided into a plurality of superblocks, each superblock being write-in-one, erase-in-one, and each superblock recording an erase count value, the erase count values of all superblocks forming the erase count table.
- 8. The apparatus of claim 7, wherein each superblock writes its corresponding erase count value to the spare area of the first physical page at the same time as the first physical page; if the erase count table on the Nand flash memory is damaged, the superblocks can acquire the erase count values of the superblocks from the standby area, the erase count values of all superblocks are completely collected together to form a new erase count table again, and the whole erase count table is backed up.
- 9. A computer device comprising a memory having stored thereon a computer program and a processor that, when executing the computer program, implements a method of SSD storage erase count table backup as claimed in any of claims 1-4.
- 10. A storage medium storing a computer program comprising program instructions which, when executed by a processor, implement the method of SSD storage erase count table backup of any of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910990162.7A CN110729014A (en) | 2019-10-17 | 2019-10-17 | Method and device for backing up erase count table in SSD (solid State disk) storage, computer equipment and storage medium |
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| CN201910990162.7A CN110729014A (en) | 2019-10-17 | 2019-10-17 | Method and device for backing up erase count table in SSD (solid State disk) storage, computer equipment and storage medium |
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| WO2023070842A1 (en) * | 2021-10-29 | 2023-05-04 | 锐凌无线有限责任公司 | Flash memory, flash memory erase/write counting method, electronic device, and computer storage medium |
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