CN103744864A - Method and system for reading and writing cache data and solid state disc thereof - Google Patents
Method and system for reading and writing cache data and solid state disc thereof Download PDFInfo
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- CN103744864A CN103744864A CN201310695547.3A CN201310695547A CN103744864A CN 103744864 A CN103744864 A CN 103744864A CN 201310695547 A CN201310695547 A CN 201310695547A CN 103744864 A CN103744864 A CN 103744864A
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- hard disc
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F12/10—Address translation
- G06F12/1081—Address translation for peripheral access to main memory, e.g. direct memory access [DMA]
Abstract
The invention is applied to the technical field of storage and provides a method for reading and writing cache data and a solid state disc of the method. The method includes the following steps that the step of establishing a list is performed and a mapping relation list between a cached hard disc address and a physical address of the cache solid state disc is established; the step of reading is performed, the request for reading and writing data of cached hard disc data is received, the mapping relation list is inquired and the cached hard disc data are read and written at the physical address of the corresponding cache hard disc. Therefore, the cache data reading and writing speed is improved and memory space of a system is saved.
Description
Technical field
The present invention relates to technical field of memory, relate in particular to a kind of method, system and solid state hard disc thereof of data cached read-write.
Background technology
Solid state hard disc is widely used in various occasions as a kind of storage medium of high speed.Simultaneously because the unit cost of flash memory is higher, so solid state hard disc is used as the buffer memory of mechanical hard disk or storage array often.Traditional solid state hard disc caching system need to safeguard that when realizing one is buffered hard disk address to the mapping table between buffer memory hard disk address, when user's access is buffered hard disk, will from this mapping table, inquires about accessed address and whether be buffered in buffer memory hard disk.If inquired, be buffered, caching system is redirected to this access in disc cache.Because buffer memory hard disk is generally selected solid state hard disc, be buffered hard disk and be generally mechanical hard disk.Therefore its read or write speed is far above being buffered hard disk, so solid state hard disc caching system can significantly promote the read or write speed of whole system.Solid state hard disc is due to its special storage medium, while making host computer system access solid state hard disc, must the logic magnetic disc address translation of host computer system be become to memory address physically by the firmware program in this hard disk, flash translation layer (FTL) in solid state hard disc firmware is being safeguarded the transformational relation table of logical address to physical address, and host computer system all needs to change by this table to the access of physical medium.
In the prior art, solid state hard disc caching system can be safeguarded and be buffered the mapping relations of mechanical hard disk address to buffer memory solid state hard disc address, flash translation layer (FTL) in solid state hard disc firmware has been safeguarded the mapping relations of solid state hard disc logical address to flash array physical address simultaneously, first caching system obtains the address of buffer memory solid state hard disc when data query by being buffered mechanical hard disk address lookup table like this, it is the logical address that flash translation layer (FTL) is used, then table look-up and by the logical address of solid state hard disc, obtain the physical address of flash array, table look-up for twice and can affect the performance of caching system, simultaneously two-stage mapping is the larger calculator memory that taken also.
Referring to Fig. 1, existing solid state hard disc caching system implementation method normally safeguards that one is buffered disk address to disc cache address address mapping table, when upper layer software (applications) access is buffered the S0 address of dish, caching system can be inquired about in this mapping table, discovery is mapped to the L0 address of disc cache, the L0 address that caching system will access cache dish like this, obtains data.Owing to being buffered hard disk, it is generally mechanical hard disk, buffer memory hard disk is generally solid state hard disc at a high speed, user need to access while being buffered mechanical hard disk like this, and caching system is redirected to buffer memory mechanical hard disk by access, can improve greatly the data access speed of whole system.
Referring to Fig. 2, because the physical characteristics of the normally used flash memory of solid state hard disc (NAND Flash) (need to first be wiped afterwards and write, cannot realize local update) restriction, solid state hard disc need to be safeguarded the mapping table of a hard disk logical address to flash array physical address, thereby to user, shields the physical characteristics of flash media.In use, if user's access logic address L0, flash translation layer (FTL) obtains L0 by tabling look-up and is mapped to P0, and the data that physical address P0 is deposited return to user.
In summary, in actual use, obviously there is inconvenience and defect in existing data cached read-write technology, so be necessary to be improved.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of method, system and solid state hard disc thereof of data cached read-write, to improve data cached read-write speed, save Installed System Memory space.
In order to realize foregoing invention object, the invention provides a kind of method of data cached read-write, comprising:
List establishment step: the mapping relations list of setting up the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Read step: receive the described read-write requests that is buffered hard disc data, inquire about described mapping relations list, be buffered hard disc data described in the physical address read-write of the described buffer memory hard disk of correspondence.
According to described method, the step that described list is set up comprises:
According to the described logical address mapping relations that are buffered hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, described mapping relations list set up.
According to described method, after described list establishment step, also comprise:
Storing step: by described mapping relations list storage in the flash translation layer (FTL) of described buffer memory solid state hard disc or be stored in the internal memory that is buffered the system of hard disc data described in read-write.
According to described method, described in to be buffered hard disk be solid state hard disc or mechanical hard disk.
According to described method, described, when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk.
In order to realize another goal of the invention of the present invention, the present invention also provides a kind of system of data cached read-write, comprising:
Module is set up in list, for setting up the mapping relations list of the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Module for reading and writing, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
According to described system, described list set up module according to described in be buffered the logical address mapping relations of hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, set up described mapping relations list;
Described system also comprises:
Memory module, for by described mapping relations list storage in the flash translation layer (FTL) of described buffer memory solid state hard disc or be stored in the internal memory that is buffered the system of hard disc data described in read-write.
According to described system, described in to be buffered hard disk be solid state hard disc or mechanical hard disk.
According to described system, described, when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk.
In order to realize another goal of the invention of the present invention, the present invention also provides a kind of solid state hard disc that comprises system described in above-mentioned any one, and described solid state hard disc comprises:
Module is set up in list, for setting up the mapping relations list of the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Read module, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
The present invention is buffered the mapping relations list of the physical address of hard disk address and buffer memory solid state hard disc by foundation; While then receiving the described read-write requests that is buffered hard disc data, inquire about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, be buffered hard disc data.Thus, the logical address that buffer memory solid state hard disc can be used at flash translation layer (FTL) is to physical address mapping table, with be buffered hard disk address and combine to the address mapping table of buffer memory solid state hard disc, when carrying out data cached read-write, can carry out fast the inquiry of respective cache physical address, improve the efficiency of the system of data cached read-write, and save a large amount of memory headrooms.
Accompanying drawing explanation
Fig. 1 is that buffer memory hard disk address mapping relation schematic diagram is arrived in the hard disk address that is buffered that in prior art, solid state hard disc caching system is used;
Fig. 2 is solid state hard disc firmware flash conversion layer address mapping relation schematic diagram in prior art;
Fig. 3 is the structural representation of the system of the data cached read-write that provides of first embodiment of the invention;
Fig. 4 is the structural representation of the system of the data cached read-write that provides of second embodiment of the invention;
Fig. 5 is the structural representation of the solid state hard disc that provides of third embodiment of the invention;
Fig. 6 is the mapping relations list schematic diagram that second embodiment of the invention provides;
Fig. 7 is the method flow diagram of the data cached read-write that provides in the fourth embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 3, a kind of system 100 of data cached read-write is provided in the first embodiment of the present invention, comprising:
Module for reading and writing 20, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
In this embodiment, first by list, set up module 10 and be merged together being buffered logical address that disk address uses to the mapping table of disc cache address and solid state hard disc flash translation layer (FTL) and the mapping table of physical address, set up the mapping relations list of the physical address that is buffered hard disk address and buffer memory solid state hard disc.This mapping relations list as shown in Figure 6.Then, when receiving the described read-write requests that is buffered hard disc data, will inquire about described mapping relations list, know fast the physical address that is buffered buffer memory hard disk corresponding to the address of hard disc data.Thus, can under this physical address, read and write fast relevant data, improve and processed the efficiency that is buffered data.The described hard disk that is buffered is solid state hard disc or mechanical hard disk.And when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk described.
Referring to Fig. 4, in the second embodiment of the present invention, list set up module 10 according to described in be buffered the logical address mapping relations of hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, set up described mapping relations list;
In this embodiment, in the mapping relations list shown in Fig. 6 by two mapping table relations of Fig. 1 and Fig. 2 are merged.Directly safeguard that one is buffered mechanical hard disk address to flash array physical address, just can improve address lookup speed, also significantly reduce the demand to calculator memory.Thus, when user's access is buffered hard disk address S0, the system 100 of data cached read-write is inquired about a mapping relations list just can be redirected to this access flash array address P0, has reduced the time of tabling look-up, and also greatly reduces the demand of mapping table to host memory.Avoided being buffered in the read-write process of hard disc data in tradition, there are two mapping tables, when user's access is buffered disk address S0, by searching mapping table, this access is redirected to disc cache address L0, the flash translation layer (FTL) of buffer memory hard disk is redirected to this access the situation of flash array address P0 again by searching mapping table, improve the efficiency of the system 100 of data cached read-write, and save a large amount of memory headrooms.
In addition, the system 100 of data cached read-write also comprises:
By memory module 30 by described mapping relations list storage in the flash translation layer (FTL) of described buffer memory solid state hard disc, thus can be by the reading efficiency of described buffer memory solid state hard disc at a high speed, this mapping relations list of fast query.Certainly, preferably by described mapping relations list storage in the internal memory of the described system 100 that is buffered hard disc data, can improve thus the work efficiency of the system 100 of data cached read-write.
Referring to Fig. 5, in the third embodiment of the present invention, also provide the solid state hard disc 200 that comprises above-mentioned any system, solid state hard disc 200 comprises:
Read module 20, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
In above-mentioned multiple embodiment, the concrete structure of the system 100 to data cached read-write is described, and therefore, the concrete structure at this for the solid state hard disc 200 that comprises this system repeats no more.Solid state hard disc 200 can be used as described buffer memory solid state hard disc.
Referring to Fig. 7, in the fourth embodiment of the present invention, provide a kind of method of data cached read-write, comprising:
In step S701, the mapping relations list that module 10 is set up the physical address that is buffered hard disk address and buffer memory solid state hard disc is set up in list; This step is list establishment step.
In step S702, module for reading and writing 20 receives the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.This step is read-write step.
In this embodiment, the system 100 of data cached read-write is the system as the read-write cache of low-speed machinery hard disk by high speed solid hard disk.List in the system 100 of first data cached read-write is set up module 10 and is united two into one to physical address mapping table being buffered the logical address of using to mapping table and the solid state hard disc of disc cache address hard disk address.Hard disk in the computer system of moving in the system 100 of this data cached read-write adopts solid state hard disc, and solid state hard disc is preserved the hot spot data that is buffered hard disk, improves the performance of whole system by the high-speed read-write characteristic of solid state hard disc.Due to, the address that is buffered hard disk of using is to mapping table between the address of buffer memory solid state hard disc, the logical address of using with the flash translation layer (FTL) of solid state hard disc combines to physical address mapping table, when can reduce in data buffer storage process table lookup operation, reduce the demand of these two mapping tables to calculator memory.When module for reading and writing 20 receives the described read-write requests that is buffered hard disc data, module for reading and writing 20 is inquired about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.In this embodiment, described in, being buffered hard disk is solid state hard disc or mechanical hard disk.Described when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk.
In the fifth embodiment of the present invention, described step S701 comprises:
List set up module 10 according to described in be buffered the logical address mapping relations of hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, set up described mapping relations list.And, after the step S701 of institute, also comprise:
In sum, the present invention is buffered the mapping relations list of the physical address of hard disk address and buffer memory solid state hard disc by foundation; While then receiving the described read-write requests that is buffered hard disc data, inquire about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, be buffered hard disc data.Thus, the logical address that buffer memory solid state hard disc can be used at flash translation layer (FTL) is to physical address mapping table, with be buffered hard disk address and combine to the address mapping table of buffer memory solid state hard disc, when carrying out data cached read-write, can carry out fast the inquiry of respective cache physical address, improve the efficiency of the system of data cached read-write, and save a large amount of memory headrooms.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. a method for data cached read-write, is characterized in that, comprising:
List establishment step: the mapping relations list of setting up the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Read step: receive the described read-write requests that is buffered hard disc data, inquire about described mapping relations list, be buffered hard disc data described in the physical address read-write of the described buffer memory hard disk of correspondence.
2. method according to claim 1, is characterized in that, the step that described list is set up comprises:
According to the described logical address mapping relations that are buffered hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, described mapping relations list set up.
3. method according to claim 2, is characterized in that, after described list establishment step, also comprises:
Storing step: by described mapping relations list storage in the flash translation layer (FTL) of described buffer memory solid state hard disc or be stored in the internal memory that is buffered the system of hard disc data described in read-write.
4. method according to claim 1, is characterized in that, described in to be buffered hard disk be solid state hard disc or mechanical hard disk.
5. method according to claim 4, is characterized in that, described, when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk.
6. a system for data cached read-write, is characterized in that, comprising:
Module is set up in list, for setting up the mapping relations list of the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Module for reading and writing, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
7. system according to claim 6, it is characterized in that, described list set up module according to described in be buffered the logical address mapping relations of hard disk address and described buffer memory solid state hard disc, and the mapping relations of the physical address of the logical address of described buffer memory solid state hard disc and described buffer memory solid state hard disc, set up described mapping relations list;
Described system also comprises:
Memory module, for by described mapping relations list storage in the flash translation layer (FTL) of described buffer memory solid state hard disc or be stored in the internal memory that is buffered the system of hard disc data described in read-write.
8. system according to claim 6, is characterized in that, described in to be buffered hard disk be solid state hard disc or mechanical hard disk.
9. system according to claim 8, is characterized in that, described, when being buffered hard disk and being solid state hard disc, the read-write speed of described buffer memory solid state hard disc is higher than the described read-write speed that is buffered hard disk.
10. a solid state hard disc that comprises system described in claim 6～9 any one, is characterized in that, described solid state hard disc comprises:
Module is set up in list, for setting up the mapping relations list of the physical address that is buffered hard disk address and buffer memory solid state hard disc;
Read module, for receiving the read-write requests that is buffered hard disc data to described, inquires about described mapping relations list, described in the physical address read-write of the described buffer memory hard disk of correspondence, is buffered hard disc data.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980469A (en) * | 2017-03-07 | 2017-07-25 | 记忆科技(深圳)有限公司 | A kind of method for improving solid state hard disc sequential write buffer efficiency |
| CN110442533A (en) * | 2019-07-18 | 2019-11-12 | 合肥杰发科技有限公司 | A kind of method, equipment and storage medium improving access performance |
| CN110781107A (en) * | 2019-09-16 | 2020-02-11 | 北京领芯迅飞科技有限公司 | Low-delay fusion IO control method and device based on DRAM interface |
| CN111694764A (en) * | 2020-05-29 | 2020-09-22 | 四川效率源信息安全技术股份有限公司 | Data reading method of failed solid state disk |
| CN116010298A (en) * | 2023-03-24 | 2023-04-25 | 温州市特种设备检测科学研究院(温州市特种设备应急处置中心) | NAND type flash memory address mapping method and device, electronic equipment and storage medium |
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2013
- 2013-12-17 CN CN201310695547.3A patent/CN103744864A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980469A (en) * | 2017-03-07 | 2017-07-25 | 记忆科技(深圳)有限公司 | A kind of method for improving solid state hard disc sequential write buffer efficiency |
| CN110442533A (en) * | 2019-07-18 | 2019-11-12 | 合肥杰发科技有限公司 | A kind of method, equipment and storage medium improving access performance |
| CN110781107A (en) * | 2019-09-16 | 2020-02-11 | 北京领芯迅飞科技有限公司 | Low-delay fusion IO control method and device based on DRAM interface |
| CN111694764A (en) * | 2020-05-29 | 2020-09-22 | 四川效率源信息安全技术股份有限公司 | Data reading method of failed solid state disk |
| CN111694764B (en) * | 2020-05-29 | 2023-03-14 | 四川效率源信息安全技术股份有限公司 | Data reading method of failed solid state disk |
| CN116010298A (en) * | 2023-03-24 | 2023-04-25 | 温州市特种设备检测科学研究院(温州市特种设备应急处置中心) | NAND type flash memory address mapping method and device, electronic equipment and storage medium |
| CN116010298B (en) * | 2023-03-24 | 2023-09-22 | 温州市特种设备检测科学研究院(温州市特种设备应急处置中心) | NAND type flash memory address mapping method and device, electronic equipment and storage medium |
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Application publication date: 20140423 |