CN102902628B - A kind of cold and hot data automatic separation method, system and flash memory realized based on flash memory - Google Patents
A kind of cold and hot data automatic separation method, system and flash memory realized based on flash memory Download PDFInfo
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Abstract
The present invention is applicable to flash memory technology field, providing a kind of cold and hot data automatic separation method, system and the flash memory that realize based on flash memory, the method comprises: for each record in the logical physical address mapping table of flash memory adds the temperature mark of the access frequency height representing data; When data are processed by flash memory, according to default Heat range, the temperature mark in logical physical address mapping table is upgraded, the temperature mark that different Heat ranges is corresponding different. The cold and hot degree of data is directly processed by the present invention in flash memory logical physical address mapping table, only needs amendment FTL algorithm, therefore realizes the cold and hot of data without the need to extra software and buffer memory and be separated. Thus the present invention can make data in the storage process of flash memory, automatically realize carrying out Separate Storage according to access frequency, it is not necessary to extra cold and hot data evaluation algorithm and buffer memory support.
Description
Technical field
The present invention relates to flash memory technology field, particularly relate to a kind of cold and hot data automatic separation method, system and the flash memory that realize based on flash memory.
Background technology
Data are often classified by existing computer or storage system according to access frequency, to distinguish cold data and dsc data, so that data are processed by user. Dsc data: need immediate access under the environment of high-performance, highly available, high request. Temperature data: being in nearly line or online backup environment, user needs these data of fast access, but the number of times of access is less. Cold data: need filing and the data that preserve for a long time.
The separation of cold and hot data is all needed to run through on main frame the software that certain algorithm model creates by current computer or storage system, need data temporary storage in internal memory (buffer memory) simultaneously, judge that data access frequency is detected by software by cold and hot data, thus judge the cold and hot degree of data. Its shortcoming mainly comprises:
One, data need to be temporarily stored in internal memory (buffer memory), add the risk that data are lost when system falls suddenly electricity.
Two, need on main frame, run cold and hot data and judge software, add the burden of host cpu.
Three, existing method is all created by algorithm and data model, and the accuracy of model have impact on the effect of final data separation.
In summary, existing cold and hot data separation method is in actual use, it is clear that there is inconvenience and defect, it is therefore necessary to improved.
Summary of the invention
For above-mentioned defect, it is an object of the invention to provide a kind of cold and hot data automatic separation method, system and the flash memory that realize based on flash memory, it can make data in the storage process of flash memory, automatically realize carrying out Separate Storage according to access frequency height, it is not necessary to extra cold and hot data evaluation algorithm and buffer memory support.
In order to realize above-mentioned purpose, the present invention provides a kind of cold and hot data automatic separation method realized based on flash memory, comprising:
For each record in the logical physical address mapping table of flash memory adds the temperature mark of the access frequency height representing data;
When data are processed by described flash memory, according to default Heat range, the temperature mark in described logical physical address mapping table is upgraded, the temperature mark that different Heat ranges is corresponding different.
Cold and hot data automatic separation method according to the present invention, according to default Heat range in the temperature step that upgrades of mark in described logical physical address mapping table: described Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to described access frequency.
Cold and hot data automatic separation method according to the present invention, comprises the step that the temperature mark in described logical physical address mapping table upgrades according to default Heat range:
When described flash memory writes a new data, the temperature of these data mark is set to most dsc data.
Cold and hot data automatic separation method according to the present invention, according to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades also is comprised: when write data are carried out Dynamic wear equilibrium treatment, in described logical physical address mapping table, the temperature mark of these write data is set to dsc data.
Cold and hot data automatic separation method according to the present invention, also comprises the step that the temperature mark in described logical physical address mapping table upgrades according to default Heat range:
When write data are carried out static abrasion equilibrium process, when after the set(ting)value having Physical Page or physics block to reach static abrasion equilibrium, data in this Physical Page or physics block are moved;
If the temperature of these data moved is designated time cold data or the coldest data, then by the temperature the coldest data of identification renewal of these data in described logical physical address mapping table, otherwise it is time cold data by the temperature identification renewal of these data.
Cold and hot data automatic separation method according to the present invention, also comprises the step that the temperature mark in described logical physical address mapping table upgrades according to default Heat range:
When, after the set(ting)value having Physical Page or physics block to reach refuse reclamation, data in this Physical Page or physics block being moved;
If the temperature of these data moved is designated most dsc data, secondary dsc data or dsc data, then it is cold data by the temperature identification renewal of these data in described logical physical address mapping table, otherwise the temperature mark keeping these data is constant.
Cold and hot data automatic separation method according to the present invention, also comprises the step that the temperature mark in described logical physical address mapping table upgrades according to default Heat range:
When carrying out data reading interference elimination treatment, then it is access the higher Heat range of frequency by the temperature identification renewal of these data.
A kind of cold and hot data automatic separation system realized based on flash memory of the corresponding offer of the present invention, comprising:
Temperature mark setting unit, for adding the temperature mark of the access frequency height of expression data for each record in the logical physical address mapping table of flash memory;
Temperature identification renewal unit, for when data are processed by described flash memory, the temperature mark in described logical physical address mapping table being upgraded according to default Heat range, the temperature mark that different Heat ranges is corresponding different.
Cold and hot data automatic separation system according to the present invention, described Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to described access frequency.
The present invention also provides a kind of flash memory comprising above-mentioned cold and hot data automatic separation system.
The present invention by adding the temperature mark of an expression data access frequency in the logical physical address mapping table of flash memory, when data are processed by flash memory, then according to the Heat range preset, the temperature mark in logical physical address mapping table is upgraded, the temperature mark that different Heat ranges is corresponding different. Data store after for some time in a flash memory, temperature mark in logical physical address mapping table can indicate the height of the access frequency of data, simultaneously owing to the cold and hot degree of data is directly processed by the present invention in flash memory logical physical address mapping table, only need amendment FTL algorithm, therefore realize the cold and hot of data without the need to extra software and buffer memory and be separated. Thus the present invention can make data in the storage process of flash memory, automatically realize carrying out Separate Storage according to access frequency, it is not necessary to extra cold and hot data evaluation algorithm and buffer memory support.
Accompanying drawing explanation
Fig. 1 is the theory structure schematic diagram of the cold and hot data automatic separation system of the present invention;
Fig. 2 is the schema of the cold and hot data automatic separation method that the present invention realizes based on flash memory;
Fig. 3 is the schema that in an embodiment of the present invention, data are carried out static abrasion equilibrium treating processes by flash memory;
Fig. 4 is the schema that in an embodiment of the present invention, data are carried out refuse reclamation treating processes by flash memory.
Embodiment
In order to make the object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. It is to be understood that specific embodiment described herein is only in order to explain the present invention, it is not intended to limit the present invention.
As shown in Figure 1, a kind of cold and hot data automatic separation system 100 realized based on flash memory of the present invention, can be applicable to SSD (SolidStateDisk, solid state hard disc) hard disk, it is built in the FTL (FlashTranslationLayer of flash memory, flash translation layer (FTL)) in, it mainly comprises temperature mark setting unit 10 and temperature identification renewal unit 20.
Temperature mark setting unit 10, for adding the temperature mark of the access frequency height of expression data for each record in the logical physical address mapping table of flash memory.
Temperature identification renewal unit, for data being processed when flash memory, upgrades the temperature mark in logical physical address mapping table according to default Heat range, the temperature mark that different Heat ranges is corresponding different. Namely different temperature marks represents different Heat ranges and different access frequencies. In one embodiment of the invention, Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to access frequency. In actually operating, Heat range can divide according to particular case. Data are carried out process and generally include by flash memory: write data, reading certificate, Dynamic wear equilibrium treatment, static abrasion equilibrium process, refuse reclamation process and read interference elimination treatment.
Due to the characteristic of flash memory self, it is necessary to FTL algorithm ensures the reliability that flash memory uses, extend the work-ing life of flash memory. Way the most frequently used at present safeguards a logical physical address mapping table for flash memory and realized by some aided algorithms. There is data write fashionable, write data in the free page (or block) of erasable least number of times-Dynamic wear is balanced; After the erasable number of times of page (or block) taken when data and the difference of the erasable number of times of current free page (or block) reach a certain set(ting)value, by this data-moving in the free page (or block) of erasable least number of times-static abrasion equilibrium; After the valid data in a page used (or block) are less than a certain set(ting)value, these valid data are moved in the free page (or block) of erasable least number of times-refuse reclamation; When the number of times that certain one page (or block) is read reaches certain number of times, these valid data are moved in the free page (or block) of erasable least number of times-are read interference eliminated.
The present invention utilizes these basic algorithms of FTL just, and carries out some amendments, makes data automatically realize the separation of cold and hot data in the storage process of flash memory. A kind of specific embodiment is as follows:
Each record in the logical physical address mapping table of flash memory increases a temperature mark, for representing the height of the access frequency of data, such as temperature mark is divided into 6 grades from high to low according to access frequency: most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data. When flash memory writes a new data, the temperature of these data mark is set to most dsc data.
The treating processes that write data carry out Dynamic wear equilibrium is same as the prior art, just when revising logical physical address mapping table, the temperature of these write data mark is set to dsc data.
Data are carried out static abrasion equilibrium when processing, when after the set(ting)value having Physical Page (or physics block) to reach static abrasion equilibrium, by data-moving in the maximum free page (or free time block) of erasable number of times; If the temperature of these data is designated time cold data or the coldest data, be the coldest data by temperature identification renewal in logical physical address mapping table, otherwise, this temperature mark is revised as secondary cold data.
When data are carried out refuse reclamation, when after the set(ting)value having Physical Page (or physics block) to reach refuse reclamation, by data-moving in the medium free page (or idle block) of erasable number of times; If the temperature of these data is designated various dsc data grade, logical physical address mapping table is revised as cold data, otherwise temperature mark is remained unchanged.
Carry out data reading interference elimination treatment, some valve values are preset to the reading number of times of data, when the number of times of reading certificate often reaches a valve value, the temperature mark of these data will be changed a grade by logical physical address mapping table toward dsc data direction, namely it will be then access the higher Heat range of frequency by the temperature identification renewal of these data.
By way above, data store after for some time in a flash memory, and the temperature mark in logical physical address mapping table can indicate the height of the access frequency of data. The present invention by adding the temperature mark of an expression data access frequency in the logical physical address mapping table of flash memory, when data are processed by flash memory, then according to the Heat range preset, the temperature mark in logical physical address mapping table is upgraded, the temperature mark that different Heat ranges is corresponding different. Simultaneously owing to the cold and hot degree of data is directly processed in flash memory logical physical address mapping table by the present invention, only need amendment FTL algorithm, therefore realize the cold and hot of data without the need to extra software and buffer memory and be separated. Thus the present invention it can carry out Separate Storage to stored in the data in flash memory according to access frequency, it is not necessary to extra cold and hot data evaluation algorithm and buffer memory support. The present invention, by specific FTL algorithm principle, makes data in the storage process of flash memory, automatically realizes the separation of cold and hot data.
As shown in Figure 2, the present invention also provides a kind of cold and hot data automatic separation method realized based on flash memory, and it is realized by system 100 as shown in Figure 1, and the method comprises:
Step S201, for each record in the logical physical address mapping table of flash memory adds the temperature mark of the access frequency height representing data. This step identifies setting unit 10 by temperature and realizes. In logical physical address mapping table, each record refers to the corresponding relation of each logical address and physical address, and in each record in logical physical address mapping table, reserved certain space stores this temperature mark, and this temperature mark is relevant to logic page.
Step S202, when data are processed by flash memory, upgrades the temperature mark in logical physical address mapping table according to default Heat range, the temperature mark that different Heat ranges is corresponding different. This step is realized by temperature identification renewal unit 20. Namely different temperature marks represents different Heat ranges and different access frequencies. In one embodiment of the invention, Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to access frequency. In actually operating, Heat range can divide according to particular case. Data are carried out process and generally include by flash memory: write data, reading certificate, Dynamic wear equilibrium treatment, static abrasion equilibrium process, refuse reclamation process and read interference elimination treatment.
Preferably, step S202 also comprises: when flash memory writes a new data, and the temperature of these data mark is set to most dsc data. Preferably, step S202 also comprises: when write data are carried out Dynamic wear equilibrium treatment, in described logical physical address mapping table, the temperature mark of these write data is set to dsc data. Preferably, step S202 also comprises: when carrying out data reading interference elimination treatment, then be access the higher Heat range of frequency by the temperature identification renewal of these data.
Fig. 3 is the schema that data are carried out static abrasion equilibrium treating processes by flash memory, and this flow process comprises:
Data in this Physical Page or physics block, when write data are carried out static abrasion equilibrium process, when after the set(ting)value having Physical Page or physics block to reach static abrasion equilibrium, are moved by step S301.
The temperature identification renewal of these data if the temperature of these data moved is designated time cold data or the coldest data, then by the temperature the coldest data of identification renewal of these data in logical physical address mapping table, otherwise is time cold data by step S302.
Fig. 4 is that data are carried out the schema of refuse reclamation treating processes by flash memory, and this flow process comprises:
Step S401, when, after the set(ting)value having Physical Page or physics block to reach refuse reclamation, data in this Physical Page or physics block being moved.
The temperature identification renewal of these data if the temperature of these data moved is designated most dsc data, secondary dsc data or dsc data, is then cold data, otherwise the temperature mark keeping these data is constant by step S402 in logical physical address mapping table.
In sum, the present invention by adding the temperature mark of an expression data access frequency in the logical physical address mapping table of flash memory, when data are processed by flash memory, then according to the Heat range preset, the temperature mark in logical physical address mapping table is upgraded, the temperature mark that different Heat ranges is corresponding different. Data store after for some time in a flash memory, temperature mark in logical physical address mapping table can indicate the height of the access frequency of data, simultaneously owing to the cold and hot degree of data is directly processed by the present invention in flash memory logical physical address mapping table, only need amendment FTL algorithm, therefore realize the cold and hot of data without the need to extra software and buffer memory and be separated. Thus the present invention can make data in the storage process of flash memory, automatically realize carrying out Separate Storage according to access frequency, it is not necessary to extra cold and hot data evaluation algorithm and buffer memory support.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (7)
1. the cold and hot data automatic separation method realized based on flash memory, it is characterised in that, comprising:
For each record in the logical physical address mapping table of flash memory adds the temperature mark of the access frequency height representing data;
When data are processed by described flash memory, the temperature mark in described logical physical address mapping table is upgraded by the Heat range preset corresponding according to described process, the temperature mark that different Heat ranges is corresponding different;
According to default Heat range in the temperature step that upgrades of mark in described logical physical address mapping table: described Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to described access frequency;
According to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades also is comprised:
When carrying out data reading interference elimination treatment, then it is access the higher Heat range of frequency by the temperature identification renewal of these data.
2. cold and hot data automatic separation method according to claim 1, it is characterised in that, according to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades is comprised:
When described flash memory writes a new data, the temperature of these data mark is set to most dsc data.
3. cold and hot data automatic separation method according to claim 1, it is characterized in that, according to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades also is comprised: when write data are carried out Dynamic wear equilibrium treatment, in described logical physical address mapping table, the temperature mark of these write data is set to dsc data.
4. cold and hot data automatic separation method according to claim 1, it is characterised in that, according to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades also is comprised:
When write data are carried out static abrasion equilibrium process, when after the set(ting)value having Physical Page or physics block to reach static abrasion equilibrium, data in this Physical Page or physics block are moved;
If the temperature of these data moved is designated time cold data or the coldest data, then by the temperature the coldest data of identification renewal of these data in described logical physical address mapping table, otherwise it is time cold data by the temperature identification renewal of these data.
5. cold and hot data automatic separation method according to claim 1, it is characterised in that, according to default Heat range, the step that the temperature mark in described logical physical address mapping table upgrades also is comprised:
When, after the set(ting)value having Physical Page or physics block to reach refuse reclamation, data in this Physical Page or physics block being moved;
If the temperature of these data moved is designated most dsc data, secondary dsc data or dsc data, then it is cold data by the temperature identification renewal of these data in described logical physical address mapping table, otherwise the temperature mark keeping these data is constant.
6. the cold and hot data automatic separation system realized based on flash memory, it is characterised in that, comprising:
Temperature mark setting unit, for adding the temperature mark of the access frequency height of expression data for each record in the logical physical address mapping table of flash memory;
Temperature identification renewal unit, for when data are processed by described flash memory, temperature mark in described logical physical address mapping table is upgraded by the Heat range preset corresponding according to described process, the temperature mark that different Heat ranges is corresponding different;
Described Heat range is divided into most dsc data, secondary dsc data, dsc data, cold data, secondary cold data and the coldest data from high to low according to described access frequency;
The temperature identification renewal of these data also for when carrying out data reading interference elimination treatment, is then the access higher Heat range of frequency by described temperature identification renewal unit.
7. one kind comprises the flash memory of system as claimed in claim 6.
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| 一种结合热数据识别的FTL算法;阳佶宏;《中国优秀硕士学位论文全文数据库信息科技辑》;20120115(第01期);摘要，第14-47页，图6.4 * |
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| Publication number | Publication date |
|---|---|
| CN102902628A (en) | 2013-01-30 |
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