CN110647476B - Method, device and equipment for writing data in solid state disk and storage medium - Google Patents
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- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0866—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches for peripheral storage systems, e.g. disk cache
- G06F12/0868—Data transfer between cache memory and other subsystems, e.g. storage devices or host systems
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- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0866—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches for peripheral storage systems, e.g. disk cache
- G06F12/0871—Allocation or management of cache space
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Abstract
The invention discloses a method, a device, equipment and a storage medium for writing data in a solid state disk, wherein the method comprises the following steps: receiving a write data request, and writing write data corresponding to the write data request into the DDR; applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful; and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk. The method and the device reduce the moving times of the LBA and improve the performance of the solid state disk.
Description
Technical Field
The present invention relates to the technical field of solid state disks, and more particularly, to a method, an apparatus, a device, and a storage medium for writing data in a solid state disk.
Background
In the process of writing data to a Solid State Disk (SSD), the performance of writing data and the correctness of the written data are important characteristics of the solid state disk, and therefore, the process of writing data is generally required to have better performance.
In a technical scheme for implementing data writing of a solid state disk, not only user data needs to be operated, but also existing internal management data of the solid state disk needs to be supported, and specifically, after a data writing request is received, a DMA controller (direct memory access controller, hereinafter, referred to as DMA) is used to move the data to a DDR memory (double data rate memory, hereinafter, referred to as DDR), corresponding reverse table data is added, and then the data in the DDR is dropped. In order to implement operations such as garbage collection, not only the L2P table but also a corresponding reverse table needs to be maintained, where L2P represents mapping of PBA (physical block address) corresponding to LBA (logical block address), and the reverse table represents mapping of LBA corresponding to PBA, so that not only data corresponding to a write data request needs to be moved to DDR, but also LBA corresponding to data needs to be moved to DDR.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a storage medium for writing data in a solid state disk, which can reduce the moving times of LBA and improve the performance of writing data in the solid state disk.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for writing data by a solid state disk comprises the following steps:
receiving a write data request, and writing write data corresponding to the write data request into the DDR;
applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful;
and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk.
Preferably, applying for a cache unit for the write data request in the local memory includes:
detecting whether an idle cache unit exists in a local memory, if so, determining that the application is successful, otherwise, determining that the application is failed; the local memory is provided with a plurality of cache units;
correspondingly, determining the applied cache unit as a destination unit includes:
if the total storage space of the idle cache units is larger than the storage space required to be occupied by the LBA corresponding to the write request, determining that the cache units with the total storage space equal to the number of the storage space required to be occupied by the LBA corresponding to the write request are the target units, and otherwise, determining that the idle cache units are all the target units.
Preferably, the determining whether the LBA in the destination unit reaches a preset transfer amount includes:
and if the LBA in any destination unit occupies the storage space of any destination unit, determining that the LBA in any destination unit reaches a preset transfer amount, otherwise, determining that the LBA in any destination unit does not reach the preset transfer amount.
Preferably, the transferring the LBA of the preset transfer amount in the destination unit to the DDR includes:
transferring the LBA with a preset transfer amount in the target unit to the DDR by using a transfer unit; the preset moving amount is equal to the maximum amount of the LBAs which can be moved by the moving unit at a time.
Preferably, before writing the write data and the corresponding LBA in the solid state disk, the method further includes:
detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in a single strip, and if so, writing the write data and the corresponding LBA into the solid state disk; otherwise, returning to the step of detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in a single strip or not until the detection result is yes.
Preferably, before writing the write data corresponding to the write data request into the DDR, the method further includes:
and applying for a write cache corresponding to the write data request in the DDR, if the application is successful, executing the step of writing the write data corresponding to the write data request into the DDR, and if the application is failed, returning to execute the step of applying for the write cache corresponding to the write data request in the DDR until the application is successful.
Preferably, the method further comprises the following steps:
and if the number of times of applying for the write cache or the cache unit reaches a preset number of times and the application result is application failure, stopping continuing application and outputting corresponding prompt information.
An apparatus for writing data on a solid state disk, comprising:
a receiving module to: receiving a write data request, and writing write data corresponding to the write data request into the DDR;
an application module to: applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful;
a moving module for: and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk.
An apparatus for writing data by a solid state disk, comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the method for writing data in the solid state disk as described in any one of the above items when the computer program is executed.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a method of writing data by a solid state disk as described in any one of the above.
The invention provides a method, a device, equipment and a storage medium for writing data in a solid state disk, wherein the method comprises the following steps: receiving a write data request, and writing write data corresponding to the write data request into the DDR; applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful; and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk. In the technical features disclosed in the present application, when transferring the LBA, that is, the reverse table data to the DDR, a corresponding cache unit is first applied for the LBA in the memory, so that the LBA is cached in the cache unit first, and when the LBA in the cache unit reaches a certain transfer amount, the LBA of the certain transfer amount is transferred to the DDR at one time, so that the LBA is transferred in a concentrated manner, which is different from the case where only one LBA is transferred in the prior art, thereby reducing the transfer frequency of the LBA, and improving the performance of the solid state disk.
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 writing data in a solid state disk according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for writing data in a solid state disk according to 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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, a flowchart of a method for writing data in a solid state disk according to an embodiment of the present invention is shown, where the method includes:
s11: and receiving a write data request, and writing write data corresponding to the write data request into the DDR.
The execution main body of the method for writing data in the solid state disk provided by the embodiment of the invention can be a corresponding device, and the device can be arranged in the processor, so that the execution main body of the method can be the processor. Specifically, the write data request is a request for writing corresponding data into the solid state disk, and after the write data request is received, the data corresponding to the write data request may be determined to be write data, and then the write data is stored in the DDR.
S12: applying for a cache unit for the write data request in the local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; and if the application fails, mounting the write data request into the list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful.
The local buffer of the reverse table may be set in the local memory in advance, or may be referred to as a cache unit, where the cache unit is used to store the LBA, and then the LBA stored in the cache unit is located. Specifically, if the cache unit is successfully applied, the LBA corresponding to the write data request may be written into the cache unit applied, otherwise, the write data request may be mounted in a preset pending list (pending list), and the step of mounting the write data request in the pending list is directly executed or executed after a preset time interval set according to actual needs is returned, and the step of applying the cache unit for the write data request is executed in return, so as to ensure that the cache unit for storing the LBA can be applied in a normal condition in this way.
S13: when the LBA in the destination unit reaches the preset transfer amount, the LBA of the preset transfer amount in the destination unit is transferred to the DDR, and the write data and the corresponding LBA are written into the solid state disk.
It should be noted that, unlike the prior art, when the LBA is moved to the DDR, if the LBA is moved to a data block of write data in the DDR, the corresponding LBA is moved to the DDR; in this embodiment, a preset moving amount needs to be set according to actual needs, where the preset moving amount is greater than the LBA corresponding to a single data block, that is, in this embodiment, after the LBAs in the destination unit reach a certain number, the certain number of LBAs are moved to the DDR at one time, so that the moving times of the LBAs are reduced, and the performance of the solid state disk is improved.
In the technical features disclosed in the present application, when transferring the LBA, that is, the reverse table data to the DDR, a corresponding cache unit is first applied for the LBA in the memory, so that the LBA is cached in the cache unit first, and when the LBA in the cache unit reaches a certain transfer amount, the LBA of the certain transfer amount is transferred to the DDR at one time, so that the LBA is transferred in a concentrated manner, which is different from the case where only one LBA is transferred in the prior art, thereby reducing the transfer frequency of the LBA, and improving the performance of the solid state disk.
The method for writing data in a solid state disk provided in the embodiments of the present invention applies for a cache unit for a data writing request in a local memory, and may include:
detecting whether an idle cache unit exists in a local memory, if so, determining that the application is successful, otherwise, determining that the application is failed; the local memory is provided with a plurality of cache units;
correspondingly, determining the applied cache unit as a destination unit may include:
if the total storage space of the idle cache units is larger than the storage space occupied by the LBA corresponding to the write request, determining that the cache units with the total storage space equal to the number of the storage space occupied by the LBA corresponding to the write request are the target units, and otherwise, determining that the idle cache units are all the target units.
It should be noted that, in this embodiment, multiple cache units may be set, and each cache unit may be multiplexed, specifically, applying for a cache unit in the local memory is to detect whether there is an idle cache unit in the local memory (the idle cache unit is a blank cache unit that does not store any data), if there is an idle cache unit, the idle cache unit may be directly used to implement LBA storage, otherwise, the cache unit needs to wait until there is an idle cache unit to implement LBA storage by using the idle cache unit. Therefore, the cache of the LBAs corresponding to the multiple write data requests can be realized conveniently through the setting and multiplexing of the multiple cache units. In addition, in consideration of limited memory capacity of the processor, in this embodiment, 4 cache units may be provided, each cache unit may hold 64 LBAs, and a single stripe (super page) includes 384 LBAs, so that the 4 cache units may store all LBAs corresponding to the single stripe and may be multiplexed if necessary.
It should be noted that, when determining the destination unit, the storage space that the LBA corresponding to the write request needs to occupy needs to be considered, if the sum of the storage spaces of the idle cache units is not greater than the storage space that the LBA corresponding to the write request needs to occupy, it is indicated that all the idle cache units need to be used for performing the cache of the LBA, at this time, it is determined that all the idle cache units are the destination unit, otherwise, it is indicated that the cache unit has redundant storage space, at this time, it is only necessary to determine, as the destination unit, the cache units whose sum of the storage spaces is equal to the number of the storage spaces that the write request needs to occupy, so that a surge in space caused after applying for the redundant cache units is avoided. If the storage space of the idle cache units is less than the storage space occupied by the LBAs corresponding to the write requests, all the idle cache units can be used for caching the LBAs corresponding to the write requests, and the LBAs corresponding to the remaining write requests wait for the new idle cache units and then are cached by the new idle cache units, so that the multiplexing of the cache units is realized, and meanwhile, the smooth caching of all the LBAs corresponding to the write requests is ensured.
In addition, under the condition that a plurality of cache units exist, after the cache unit application for the write data request in the local memory fails and the write data request is mounted in the to-be-processed list, whether a free cache unit exists can be detected in real time, so that the write data request in the to-be-processed list is processed after the free cache unit is detected, that is, the free cache unit is allocated to the LBA corresponding to the write data request cache.
The method for writing data in a solid state disk according to the embodiment of the present invention determines whether the LBA in the destination unit reaches the preset migration amount, and may include:
and if the LBA in any destination unit occupies the storage space of any destination unit, determining that the LBA in any destination unit reaches the preset transfer amount, otherwise, determining that the LBA in any destination unit does not reach the preset transfer amount.
It should be noted that, in this embodiment, the storage space of each cache unit may be set to be equal to the preset transfer amount, so that as long as the destination unit is occupied, it is determined that the LBA in the destination unit reaches the preset transfer amount, and then the LBA in the destination unit is transferred by data, which facilitates quick implementation of the step of whether the LBA in the cache unit can be transferred. Moreover, after a cache unit is full, the stored LBA is immediately moved to the DDR, and the next idle cache unit can be used in the moving process, so that the waiting time is covered, and the LBA moving efficiency is further improved.
The method for writing data in a solid state disk according to the embodiment of the present invention is to transfer an LBA with a preset transfer amount in a destination unit to a DDR, and may include:
transferring the LBA with the preset transfer amount in the target unit to the DDR by using the transfer unit; the preset moving amount is equal to the maximum amount of LBAs which can be moved by the moving unit at a time.
It should be noted that, in this embodiment, the preset transfer amount may be set to the maximum amount of the LBAs that the transfer unit can transfer, so that the transfer unit can transfer the largest LBAs each time, thereby implementing full utilization of the transfer unit during LBA transfer, and facilitating improvement of performance of writing data in the solid state disk.
Before writing the write data and the corresponding LBA in the solid state disk, the method for writing data in the solid state disk according to the embodiment of the present invention may further include:
detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in a single strip, and if so, writing the write data and the corresponding LBA into the solid state disk; otherwise, returning to the step of detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in the single stripe or not until the detection result is yes.
The strip is a storage unit in the solid state disk, and when the data volume of the write data stored in the DDR is detected to reach the data volume of the data required to be stored in a single strip, the write data and the corresponding LBA are written into the solid state disk, so that the data writing of the whole strip can be realized during the data writing, the method is different from the multiple writing of the same strip, and the data writing efficiency is greatly improved. Further, after receiving the write data request, the DDR allocates a corresponding address to the write data request, and the write data and the corresponding LBA may be written to the allocated address.
The method for writing data in the solid state disk provided in the embodiment of the present invention may further include, before writing the write data corresponding to the write data request into the DDR:
and applying for a corresponding write cache for the write data request in the DDR, if the application is successful, executing the step of writing the write data corresponding to the write data request into the DDR, and if the application is failed, returning to execute the step of applying for the corresponding write cache for the write data request in the DDR until the application is successful.
If the write cache has enough free storage space for storing the write data, the application is successful, otherwise, partial data in the write data needs to be cached in the DDR firstly, and the rest data in the write data is cached in the released storage space after the released storage space exists, so that all the write data is cached in the DDR through multiple cycles, and the write data can be stored in the DDR at the highest speed. In addition, in order to avoid the situation of data confusion, in this embodiment, when there is no sufficient free storage space for storing write data in the write cache, the write data may be cached in the DDR after waiting until there is sufficient free storage space for storing write data.
The method for writing data in the solid state disk provided by the embodiment of the invention can further comprise the following steps:
and if the number of times of applying for writing the cache or applying for the cache unit reaches the preset number of times and the application result is application failure, stopping continuously applying and outputting corresponding prompt information.
The preset times can be set according to actual needs, and when the times of applying for writing the cache or applying for the cache unit reach the preset times but the application is not successful, other abnormal conditions may exist, and at this time, the corresponding application step is not executed again, but prompt information is output to inform a worker of the abnormal conditions and the abnormal conditions are processed by the worker.
According to the technical characteristics disclosed by the application, a double-cache mechanism is adopted, a write cache is arranged in a DDR to realize the cache of write data corresponding to a write data request, a cache unit is arranged in a local memory to realize the cache of LBAs corresponding to the write data request, and the LBAs in the cache unit are moved when the number of the LBAs reaches a preset moving amount, which is different from the single moving of the LBAs in the prior art, so that the times and frequency of LBA moving are greatly reduced.
An embodiment of the present invention further provides a device for writing data in a solid state disk, as shown in fig. 2, the device may include:
a receiving module 11, configured to: receiving a write data request, and writing write data corresponding to the write data request into the DDR;
an application module 12 for: applying for a cache unit for the write data request in the local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful;
a moving module 13 for: when the LBA in the destination unit reaches the preset transfer amount, the LBA of the preset transfer amount in the destination unit is transferred to the DDR, and the write data and the corresponding LBA are written into the solid state disk.
In an apparatus for writing data in a solid state disk provided in an embodiment of the present invention, an application module may include:
a detection unit to: detecting whether an idle cache unit exists in a local memory, if so, determining that the application is successful, otherwise, determining that the application is failed; the local memory is provided with a plurality of cache units;
a determination unit configured to: if the total storage space of the idle cache units is larger than the storage space occupied by the LBA corresponding to the write request, determining that the cache units with the total storage space equal to the number of the storage space occupied by the LBA corresponding to the write request are the target units, and otherwise, determining that the idle cache units are all the target units.
In the apparatus for writing data in a solid state disk provided in an embodiment of the present invention, the moving module may include:
a determination unit configured to: and if the LBA in any destination unit occupies the storage space of any destination unit, determining that the LBA in any destination unit reaches the preset transfer amount, otherwise, determining that the LBA in any destination unit does not reach the preset transfer amount.
In the apparatus for writing data in a solid state disk provided in an embodiment of the present invention, the moving module may include:
a moving unit for: transferring the LBA with the preset transfer amount in the target unit to the DDR by using the transfer unit; the preset moving amount is equal to the maximum amount of LBAs which can be moved by the moving unit at a time.
The apparatus for writing data in a solid state disk provided in the embodiments of the present invention may further include:
a detection module to: before writing the write data and the corresponding LBA into the solid state disk, detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data required to be stored in a single strip, if so, writing the write data and the corresponding LBA into the solid state disk; otherwise, returning to the step of detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in the single stripe or not until the detection result is yes.
The apparatus for writing data in a solid state disk provided in the embodiments of the present invention may further include:
a data caching module to: before writing the write data corresponding to the write data request into the DDR, applying for a corresponding write cache for the write data request in the DDR, if the application is successful, executing the step of writing the write data corresponding to the write data request into the DDR, and if the application is failed, returning to execute the step of applying for the write cache corresponding to the write data request in the DDR until the application is successful.
The apparatus for writing data in a solid state disk provided in the embodiments of the present invention may further include:
a prompt module to: and if the number of times of applying for writing the cache or applying for the cache unit reaches the preset number of times and the application result is application failure, stopping continuously applying and outputting corresponding prompt information.
An embodiment of the present invention further provides a device for writing data in a solid state disk, where the device may include:
a memory for storing a computer program;
and the processor is used for realizing the steps of the method for writing data in the solid state disk as described in any one of the above when executing the computer program.
The embodiment of the invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for writing data in the solid state disk as described above are implemented.
It should be noted that for descriptions of relevant parts in the apparatus, the device, and the storage medium for writing data in the solid state disk provided in the embodiment of the present invention, reference is made to detailed descriptions of corresponding parts in the method for writing data in the solid state disk provided in the embodiment of the present invention, and details are not described herein again. In addition, parts of the technical solutions provided in the embodiments of the present invention that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for writing data in a solid state disk is characterized by comprising the following steps:
receiving a write data request, and writing write data corresponding to the write data request into the DDR;
applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful;
and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk.
2. The method of claim 1, wherein applying for a cache unit in a local memory for the write data request comprises:
detecting whether an idle cache unit exists in a local memory, if so, determining that the application is successful, otherwise, determining that the application is failed; the local memory is provided with a plurality of cache units;
correspondingly, determining the applied cache unit as a destination unit includes:
if the total storage space of the idle cache units is larger than the storage space required to be occupied by the LBA corresponding to the write data request, determining that the cache units with the total storage space equal to the number of the storage space required to be occupied by the LBA corresponding to the write data request are the target units, and otherwise, determining that the idle cache units are all the target units.
3. The method of claim 2, wherein determining whether the LBA in the destination unit reaches a predetermined shift amount comprises:
and if the LBA in any destination unit occupies the storage space of any destination unit, determining that the LBA in any destination unit reaches a preset transfer amount, otherwise, determining that the LBA in any destination unit does not reach the preset transfer amount.
4. The method according to claim 3, wherein transferring the LBA of the predetermined transfer amount in the destination unit to the DDR comprises:
transferring the LBA with a preset transfer amount in the target unit to the DDR by using a transfer unit; the preset moving amount is equal to the maximum amount of the LBAs which can be moved by the moving unit at a time.
5. The method of claim 4, wherein before writing the write data and the corresponding LBAs to the solid state disk, the method further comprises:
detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in a single strip, and if so, writing the write data and the corresponding LBA into the solid state disk; otherwise, returning to the step of detecting whether the data volume of the write data stored in the DDR reaches the data volume of the data to be stored in a single strip or not until the detection result is yes.
6. The method of claim 5, wherein before writing write data corresponding to the write data request into the DDR, the method further comprises:
and applying for a write cache corresponding to the write data request in the DDR, if the application is successful, executing the step of writing the write data corresponding to the write data request into the DDR, and if the application is failed, returning to execute the step of applying for the write cache corresponding to the write data request in the DDR until the application is successful.
7. The method of claim 6, further comprising:
and if the number of times of applying for the write cache or the cache unit reaches a preset number of times and the application result is application failure, stopping continuing application and outputting corresponding prompt information.
8. An apparatus for writing data on a solid state disk, comprising:
a receiving module to: receiving a write data request, and writing write data corresponding to the write data request into the DDR;
an application module to: applying for a cache unit for the write data request in a local memory, if the application is successful, determining the applied cache unit as a target unit, and writing the LBA corresponding to the write data request into the target unit; if the application fails, mounting the write data request into a list to be processed, and returning to execute the step of applying for the cache unit for the write data request until the application is successful;
a moving module for: and when the LBA in the target unit reaches a preset moving amount, moving the LBA of the preset moving amount in the target unit to the DDR, and writing the write data and the corresponding LBA into a solid state disk.
9. An apparatus for writing data on a solid state disk, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for writing data on the solid state disk according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, having a computer program stored thereon, which, when being executed by a processor, implements the steps of the method for writing data by a solid state disk according to any one of claims 1 to 7.
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