CN110688257A - Method, device and equipment for repairing local metadata of full flash memory array - Google Patents
Method, device and equipment for repairing local metadata of full flash memory array Download PDFInfo
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- CN110688257A CN110688257A CN201910905591.XA CN201910905591A CN110688257A CN 110688257 A CN110688257 A CN 110688257A CN 201910905591 A CN201910905591 A CN 201910905591A CN 110688257 A CN110688257 A CN 110688257A
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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
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1479—Generic software techniques for error detection or fault masking
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
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Abstract
The invention discloses a method, a device and equipment for repairing local metadata of a full flash memory array, wherein the method comprises the following steps: acquiring fault information of a local fault after the local fault occurs in a metadata area of the full flash memory array; the fault information comprises a first metadata type and a fault area; the first metadata type is forward metadata or reverse metadata; searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type; the method and the device utilize the characteristic that forward metadata and reverse metadata in the full flash memory array are mutually backed up, when one type of metadata has a local fault, the other type of metadata is utilized to repair the local fault, so that the metadata cannot be lost in a local fault scene, and the stability of the full flash memory array system is improved.
Description
Technical Field
The present invention relates to the field of storage technologies, and in particular, to a method, an apparatus, and a device for repairing local metadata of a full flash memory array.
Background
Nowadays, SSD (Solid State Drives) disks are in large commercial use. Due to the unique features of the SSD disk itself, and the differences between the conventional mechanical disks, each storage manufacturer has developed software suitable for AFA (ALL flash array) in succession: all host write requests are broken into large blocks of data, then new space writes are allocated from the hard disk, and space is reclaimed for written but invalid space through a garbage reclamation function. Based on this implementation, the data of the host write request, particularly at which location of the storage space, will not be directly available with computations, and thus a large amount of metadata is required to be saved.
Currently, the mainstream AFA software system requires at least type 2 metadata: forward metadata, which is metadata for storing the mapping from a host LUN (Logical Unit Number) to a physical space, and is used for finding a corresponding physical space when a subsequent host reads data of a specific LUN; and the reverse metadata is used for storing the metadata of the mapping from the physical space to the host LUN, has a one-to-one correspondence relationship with the forward metadata, and is used for garbage recovery and migration of data.
In order to reduce the write penalty of AFA, a single piece of metadata represents as small a block as possible, and is usually several KB, so that the amount of metadata is large, and often reaches TB level, and the large metadata needs to be saved on the SSD disk. By making the metadata more reliable, metadata preservation also needs to be protected with RAID (Redundant Array of independent Disks) as well as data. However, the better RAID level cannot guarantee 100% that the metadata is not lost, because the SSD disk has multiple failure scenarios, and when the failures of multiple disks are superimposed, the redundancy protection of the RAID is destroyed, resulting in the loss of the metadata. A bad block (bad block) is the most typical one, and usually occurs because a single bad block occurs on a single SSD disk, and the bad block is likely to occur when the SSD disk has a near-life and is not easily discovered for a long time, and if a disk fault or a bad block occurs on another subsequent SSD disk, an irreparable local fault occurs in the RAID group, which results in data loss.
Therefore, how to repair the metadata of the local fault on the full flash memory array is an urgent problem to be solved today, so as to ensure that the metadata is not lost in the scene of the local fault and improve the stability of the full flash memory array system.
Disclosure of Invention
The invention aims to provide a method, a device and equipment for repairing local metadata of a full flash memory array, which are used for repairing the metadata of local faults on the full flash memory array by utilizing the characteristic that forward metadata and reverse metadata are mutually backed up, so that the stability of a full flash memory array system is improved.
In order to solve the above technical problem, the present invention provides a method for repairing local metadata of a full flash memory array, including:
after a metadata area of a full flash memory array has a local fault, acquiring fault information of the local fault; wherein the failure information comprises a first metadata type and a failure region; the first metadata type is forward metadata or reverse metadata;
searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type.
Optionally, the searching and using the metadata corresponding to the local fault from the metadata of the second metadata type opposite to the first metadata type to repair the local fault includes:
and traversing the metadata of the second metadata type, and searching the metadata lost due to the local fault for reinsertion.
Optionally, when the first metadata type is forward metadata, the searching and using metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault further includes:
if a target access instruction sent by a host is received, returning local fault repair information to the host; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
Optionally, when the first metadata type is reverse metadata, the searching and using metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault further includes:
when garbage is recycled, the physical space corresponding to the fault area is not recycled; wherein the failure information includes the failure region.
Optionally, the obtaining of the fault information of the local fault includes:
acquiring the fault information recorded when the local fault occurs;
correspondingly, after the metadata corresponding to the local fault is searched for and utilized from the metadata of the second metadata type opposite to the first metadata type, and the local fault is repaired, the method further includes:
and after the repair is finished, deleting the recorded fault information.
The present invention also provides a device for repairing local metadata of a full flash memory array, comprising:
the acquisition module is used for acquiring the fault information of the local fault after the metadata area of the full flash memory array has the local fault; wherein the fault information comprises a first metadata type; the first metadata type is forward metadata or reverse metadata;
the repairing module is used for searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type.
Optionally, the repair module is specifically configured to traverse the metadata of the second metadata type, and search for metadata lost due to the local failure for reinsertion.
Optionally, when the first metadata type is forward metadata, the apparatus further includes:
the access module is used for returning local fault repair information to the host if a target access instruction sent by the host is received; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
Optionally, when the first metadata type is reverse metadata, the apparatus further includes:
the garbage recycling module is used for not recycling the physical space corresponding to the fault area when the garbage is recycled; wherein the failure information includes the failure region.
In addition, the present invention also provides a partial metadata repair apparatus of a full flash memory array, including:
a memory for storing a computer program;
a processor for implementing the steps of the method for partial metadata repair of a full flash array as claimed in any one of the above when executing said computer program.
According to the method for repairing the local metadata of the full flash memory array, provided by the invention, the metadata corresponding to the local fault is searched and utilized from the metadata of the second metadata type opposite to the first metadata type, the local fault is repaired, and the characteristic that the forward metadata and the reverse metadata in the full flash memory array are mutually backed up is utilized, so that when one metadata has the local fault, the other metadata is utilized to repair the local fault, the metadata cannot be lost in a local fault scene, and the stability of the full flash memory array system is improved. In addition, the invention also provides a device and equipment for repairing the local metadata of the full flash memory array, and the device and equipment also have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for repairing local metadata of a full flash memory array according to an embodiment of the present invention;
fig. 2 is a block diagram of a partial metadata repair apparatus for a full flash memory array according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but 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.
Referring to fig. 1, fig. 1 is a flowchart illustrating a partial metadata repair method for a full flash memory array according to an embodiment of the present invention, where the method includes:
step 101: acquiring fault information of a local fault after the local fault occurs in a metadata area of the full flash memory array; wherein the fault information includes a first metadata type; the first metadata type is forward metadata or reverse metadata.
Specifically, the first metadata type in this step may be a type of metadata that has a partial failure, such as forward metadata or reverse metadata.
It can be understood that, in the process of repairing a local fault, the purpose of this step may be to determine the type of metadata in which the local fault occurs, that is, the first metadata type, by obtaining fault information of the local fault, so that the characteristic that forward metadata and reverse metadata in the full flash memory array are backed up with each other may be utilized to search corresponding metadata from metadata of a second metadata type opposite to the first metadata type to repair the local fault.
Specifically, the specific manner of acquiring the fault information of the local fault after the local fault occurs in the metadata area of the full flash memory array in the step can be set by a designer according to a practical scene and user requirements, and if the local fault occurs in the metadata area, the fault information of the local fault can be directly acquired, namely, the repair of the local fault is directly started after the local fault occurs in the metadata area; or after the repair of the local fault is started, the fault information recorded when the local fault occurs may be acquired, that is, after the local fault occurs in the metadata area, the fault information of the local fault may be recorded first, and after the repair of the local fault is started, the local fault may be repaired according to the recorded fault information. The present embodiment does not set any limit to this.
Correspondingly, when the step is to acquire the fault information recorded when the local fault occurs after the local fault occurs in the metadata area of the full flash memory array, the method provided by this embodiment may further include a step of recording the fault information of the local fault when the local fault occurs in the metadata area. For example, when the number of recorded fault information reaches a preset value, a processor (such as a system background) may initiate repair of a local fault; or the processor may utilize the recorded fault information to repair the local fault at preset time intervals.
It should be noted that the failure information in this step may be information required to repair a local failure. The specific content of the fault information can be set by a designer, for example, the fault information may include not only the first metadata type but also a fault area, that is, an area where the metadata that has a local fault is located, so that the repair process of the local fault can be performed only for the fault area. The present embodiment does not set any limit to this.
Step 102: searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type.
Specifically, the second metadata type in this step may be a type of metadata that needs to be used for performing partial failure recovery, that is, a type of metadata that backs up metadata of the first metadata type, that is, a metadata type opposite to the first metadata type. If the first metadata type is forward metadata, the second metadata type may be reverse metadata; when the first metadata type is reverse metadata, the second metadata type may be forward metadata.
It can be understood that, in this step, the metadata corresponding to the local failure may be metadata found in the metadata of the second metadata type and required to repair the local failure, such as content of metadata of the first metadata type that is backed up in the metadata of the second metadata type and lost due to the local failure. The purpose of this step may be to repair the local failure according to metadata of a second metadata type opposite to metadata of a first metadata type in which the local failure occurs, by using a characteristic that forward metadata and reverse metadata are backed up with each other in the full flash memory array.
Specifically, the specific manner of searching for and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type in the step to repair the local fault can be set by a designer, for example, the step may traverse the metadata of the second metadata type, search for metadata lost due to the local fault for reinsertion, that is, traverse the metadata of the second metadata type, find out the metadata lost in the fault area of the local fault in the metadata of the first metadata type for reinsertion, and achieve the purpose of repairing the metadata of the local fault; for example, when the forward metadata has a local failure, the metadata with the type of reverse metadata can be traversed, and the metadata lost due to the local failure in the forward metadata can be found and reinserted into the corresponding position in the forward metadata. In this step, metadata lost due to a local failure may be found and reinserted in other search manners instead of traversing metadata of the second metadata type. The present embodiment does not set any limit to this.
It should be noted that, because the amount of metadata is large, the repair process of a local fault may be long, and in order to ensure the continuity of host services in the repair process, if a local fault occurs in the forward metadata area, because the forward metadata directly maps data that the host wants to access, if the host just needs to access the fault area, local fault repair information such as a medium error or a suspended access may be returned to the host, and the access may be recovered after the metadata repair of a subsequent local fault is completed; and the host service can still be normally accessed in most other areas without local faults. Namely, the present embodiment may include: when the first metadata type is forward metadata, if a target access instruction sent by the host is received, returning local fault repair information to the host; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
If the reverse metadata area has local faults, the IO access of the host is not influenced because the reverse metadata only plays a role in garbage collection. Physical space blocks with local faults can be marked, garbage recovery is not carried out on the physical space blocks, and the marks are eliminated after metadata repair of subsequent local faults is completed; and the garbage can be normally recycled in most other areas without local faults. Namely, the present embodiment may include: if the first metadata type is reverse metadata, not recycling the physical space corresponding to the fault area during garbage recycling; wherein the fault information includes a fault region.
Correspondingly, after the local fault is repaired in this step, if the fault information of the local fault is recorded, this embodiment may further include a step of deleting the recorded fault information of the local fault, so as to recover the original host service and garbage collection processing logic.
In this embodiment, the embodiment of the present invention searches for and uses metadata corresponding to a local failure from metadata of a second metadata type opposite to the first metadata type to repair the local failure, and uses the characteristic that forward metadata and reverse metadata in a full flash memory array are backed up with each other, when a metadata of one type has a local failure, the other type of metadata is used to repair the local failure, so as to ensure that the metadata is not lost in a local failure scenario, and improve the stability of the full flash memory array system.
Referring to fig. 2, fig. 2 is a block diagram of a partial metadata repair apparatus for a full flash memory array according to an embodiment of the present invention, where the apparatus may include:
the acquiring module 10 is used for acquiring fault information of a local fault after the metadata area of the full flash memory array has the local fault; wherein the fault information includes a first metadata type; the first metadata type is forward metadata or reverse metadata;
a repairing module 20, configured to search and repair a local failure by using metadata corresponding to the local failure from metadata of a second metadata type opposite to the first metadata type; wherein the first metadata type is different from the second metadata type.
Optionally, the repair module 20 may be specifically configured to traverse the metadata of the second metadata type, and find the metadata lost due to the local failure for reinsertion.
Optionally, when the first metadata type is forward metadata, the apparatus may further include:
the access module is used for returning local fault repair information to the host if a target access instruction sent by the host is received; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
Optionally, when the first metadata type is reverse metadata, the apparatus may further include:
the garbage recycling module is used for not recycling the physical space corresponding to the fault area when the garbage is recycled; wherein the fault information includes a fault region.
Optionally, the obtaining module 10 may be specifically configured to obtain fault information recorded when a local fault occurs;
correspondingly, the device can further comprise:
and the deleting module is used for deleting the recorded fault information after the repairing is finished.
In this embodiment, in the embodiment of the present invention, the repair module 20 searches for and uses metadata corresponding to a local failure from metadata of a second metadata type opposite to the first metadata type to repair the local failure, and uses the characteristic that forward metadata and reverse metadata in the full flash memory array are backed up with each other, when a metadata has a local failure, the other metadata is used to repair the local failure, so as to ensure that the metadata is not lost in a local failure scene, and improve the stability of the full flash memory array system.
An embodiment of the present invention further provides a device for repairing local metadata of a full flash memory array, including:
a memory for storing a computer program;
a processor, configured to implement the steps of the method for partial metadata repair of a full flash memory array as provided in the above embodiments when executing a computer program.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for repairing local metadata of a full flash memory array provided in the above embodiment are implemented.
Wherein the computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed in the embodiments correspond to the method disclosed in the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, the device and the equipment for repairing the local metadata of the full flash memory array provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for repairing local metadata of a full flash memory array, comprising:
after a metadata area of a full flash memory array has a local fault, acquiring fault information of the local fault; wherein the fault information comprises a first metadata type; the first metadata type is forward metadata or reverse metadata;
searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type.
2. The method of claim 1, wherein the searching for and using the metadata corresponding to the local failure from the metadata of the second metadata type opposite to the first metadata type to repair the local failure comprises:
and traversing the metadata of the second metadata type, and searching the metadata lost due to the local fault for reinsertion.
3. The method of claim 1, wherein when the first metadata type is forward metadata, the method searches for and repairs the local failure using metadata corresponding to the local failure from metadata of a second metadata type opposite to the first metadata type, and further comprises:
if a target access instruction sent by a host is received, returning local fault repair information to the host; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
4. The method of claim 1, wherein when the first metadata type is reverse metadata, the retrieving and using metadata corresponding to the local failure from metadata of a second metadata type opposite to the first metadata type to repair the local failure further comprises:
when garbage is recycled, the physical space corresponding to the fault area is not recycled; wherein the failure information includes the failure region.
5. The method of claim 1, wherein the obtaining the failure information of the local failure comprises:
acquiring the fault information recorded when the local fault occurs;
correspondingly, after the metadata corresponding to the local fault is searched for and utilized from the metadata of the second metadata type opposite to the first metadata type, and the local fault is repaired, the method further includes:
and after the repair is finished, deleting the recorded fault information.
6. A partial metadata repair apparatus for a full flash memory array, comprising:
the acquisition module is used for acquiring the fault information of the local fault after the metadata area of the full flash memory array has the local fault; wherein the fault information comprises a first metadata type; the first metadata type is forward metadata or reverse metadata;
the repairing module is used for searching and utilizing metadata corresponding to the local fault from metadata of a second metadata type opposite to the first metadata type to repair the local fault; wherein the first metadata type is different from the second metadata type.
7. The apparatus according to claim 6, wherein the repair module is specifically configured to traverse the metadata of the second metadata type, and find the metadata lost due to the local failure for reinsertion.
8. The apparatus of claim 6, wherein when the first metadata type is forward metadata, further comprising:
the access module is used for returning local fault repair information to the host if a target access instruction sent by the host is received; the target access instruction is an instruction for accessing a fault area, and the fault information comprises the fault area.
9. The apparatus of claim 6, wherein when the first metadata type is reverse metadata, further comprising:
the garbage recycling module is used for not recycling the physical space corresponding to the fault area when the garbage is recycled; wherein the failure information includes the failure region.
10. A partial metadata repair device for a full flash array, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method of partial metadata repair of a full flash array as claimed in any one of claims 1 to 5 when executing said computer program.
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| CN201910905591.XA CN110688257A (en) | 2019-09-20 | 2019-09-20 | Method, device and equipment for repairing local metadata of full flash memory array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111813603A (en) * | 2020-07-16 | 2020-10-23 | 济南浪潮数据技术有限公司 | Method, device and equipment for backing up metadata of thin volume and readable storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111813603A (en) * | 2020-07-16 | 2020-10-23 | 济南浪潮数据技术有限公司 | Method, device and equipment for backing up metadata of thin volume and readable storage medium |
| CN111813603B (en) * | 2020-07-16 | 2022-06-10 | 济南浪潮数据技术有限公司 | Method, device and equipment for backing up metadata of thin volume and readable storage medium |
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