CN103744796A - Caching method and system by means of uSSD - Google Patents
Caching method and system by means of uSSD Download PDFInfo
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Abstract
The invention applies to the technical field of computers and provides a caching method and system by means of uSSD. The method includes a setting step, a reading step and a write-in step, wherein the setting step includes the procedure of setting the uSSD as a buffer memory of a solid state disk, the reading step includes the procedures of receiving reading instructions, and reading data from the solid state disk or the buffer memory according to the storage condition of the data corresponding to the reading instructions, and the write-in step includes the procedures of receiving write-in instructions, and writing data corresponding to the write-in instructions in the solid state disk or the buffer memory according to the working condition of the buffer memory. Accordingly, the caching method and system improve the storage efficiency of the solid state disk.
Description
Technical field
The present invention relates to field of computer technology, relate in particular to method and system thereof that a kind of uSSD of employing realizes buffer memory.
Background technology
Current mobile computing platform has miniaturization, lightening trend.This is at notebook computer, embodies more and more obvious on super or panel computer.
The miniaturization of mobile computing platform, lightening to SSD(Solid State Disk, solid state hard disc) have higher requirement, this need to reduce the volume of SSD.SATA-IO(serial ATA international organization) proposed uSSD(embedded micro solid state hard disc, standard microSSD), is mainly used in embedded SSD, solves the demand of SSD miniaturization.USSD is by master control, DRAM(DynamicRandomAccessMemory, dynamic RAM) and FLASH be all packaged together, by BGA(Ball Grid Array, the PCB of ball grid array structure), the mode of pin directly can be welded on mainboard.
The method reduces at present volume aspect and obtains very good effect, but the capacity of uSSD is done not highly conventionally, and owing to being unfavorable for expansion capacity.Its former because: uSSD is by master control, and DRAM and FLASH are packaged together, and capacity is inevitable limited, even and if accomplish that its cost of relatively large capacity is also very high.
In summary, in actual use, obviously there is inconvenience and defect in the memory technology of existing solid state hard disc, 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 uSSD of employing to realize the method and system of buffer memory, to improve the storage efficiency of solid state hard disc.
To achieve these goals, the invention provides a kind of method that uSSD of employing realizes buffer memory, described method comprises the steps:
Setting steps: uSSD is set to the memory buffer of solid state hard disc;
Read step: receive reading order, according to the storage condition of data corresponding to described reading order, read from described solid state hard disc or described memory buffer;
Write step: receive and write order, according to described memory buffer working condition, data corresponding to said write order are write in described solid state hard disc or described memory buffer.
According to described method, after described setting steps, also comprise:
The partial data of described solid state hard disc is stored in described memory buffer;
Described read step comprises:
Receive reading order, judge whether the data that described reading order is corresponding are stored in described memory buffer;
If so, from described memory buffer, read the data that described reading order is corresponding;
If not, from described solid state hard disc, read the data that described reading order is corresponding.
According to described method, described method also comprises:
Data replacement step: the data in described memory buffer are divided into dsc data and cold data, and described dsc data is replaced to described cold data; Or
Buffer state memory determining step: receiving while writing order, judge described memory buffer work
Make state; Said write step comprises:
Receiving while writing order, and judging when described memory buffer duty is busy condition, data corresponding to said write order are being written to described solid state hard disc;
Receiving while writing order, and judging when described memory buffer duty is idle condition, data corresponding to said write order are being written to described memory buffer.
According to described method, the logical block addresses corresponding to data of storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form;
In described read step, by inquiring about reading order is corresponding described in described table lookup the data address in described memory buffer.
According to described method, described method also comprises:
Data Update step: when described memory buffer is more during new data, data corresponding on described solid state hard disc are also upgraded; When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.
In order to realize another goal of the invention of the present invention, the present invention also provides a kind of uSSD of employing to realize the system of buffer memory, comprising:
Module is set, for uSSD, is set to the memory buffer of solid state hard disc;
Read module for receiving reading order, according to the storage condition of data corresponding to described reading order, reads from described solid state hard disc or described memory buffer;
Writing module, writes order for receiving, and according to described memory buffer working condition, data corresponding to said write order is write in described solid state hard disc or described memory buffer.
According to described system, described system also comprises:
Cache module, for storing the partial data of described solid state hard disc into described memory buffer;
Described read module comprises:
Judgement submodule, for receiving reading order, judges whether the data that described reading order is corresponding are stored in described memory buffer;
Reading submodule, while existing for being judged as at described judgement submodule, reads from described memory buffer the data that described reading order is corresponding; And be judged as while not existing at described judgement submodule, from described solid state hard disc, read the data that described reading order is corresponding.
According to described system, described system also comprises:
Data replacement module, for the data in described memory buffer being divided into dsc data and cold data, and replaces described cold data by described dsc data;
Buffer state memory judge module, for receiving while writing order, judges described memory buffer duty;
In described memory buffer, receive while writing order, said write module, when described buffer state memory judge module judges that described memory buffer duty is busy condition, is written to described solid state hard disc by data corresponding to said write order;
When described buffer state memory judge module judges that described memory buffer duty is idle condition, data corresponding to said write order are written to described memory buffer.
According to described system, the logical block addresses corresponding to data of storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form;
Described read module is by the address of data corresponding to reading order in described memory buffer described in the described table lookup of inquiry.
According to described system, described system also comprises:
Data update module, for when described memory buffer is more during new data, also upgrades data corresponding on described solid state hard disc; Or
When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.
The present invention is set to the memory buffer of solid state hard disc by uSSD; Receiving reading order, according to the storage condition of data corresponding to described reading order, from described solid state hard disc or described memory buffer, read; Further receive and write order, according to described memory buffer working condition, data corresponding to said write order are write in described solid state hard disc or described memory buffer.Thus, improved the storage efficiency of host computer system.Preferably, read in advance data in hard disk in advance in uSSD, and the correlation module by uSSD carries out optimal treatment to Host Command when processing host order, improve the efficiency of system storage.The algorithm of the uSSD providing in the embodiment of the present invention guarantees that the performance of hard disk can not decline, and the controllability of amount of capacity can be stronger simultaneously.In addition, so can not save the cost of space and interface because uSSD does not need SATA interface module.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram that employing uSSD that first embodiment of the invention provides realizes buffer memory;
Fig. 2 be the present invention second and third, the employing uSSD that provides of four embodiment realizes the system architecture schematic diagram of buffer memory;
Fig. 3 is the method flow schematic diagram that employing uSSD that fifth embodiment of the invention provides realizes buffer memory;
Fig. 4 is the system architecture schematic diagram that employing uSSD that one embodiment of the invention provides realizes buffer memory;
Fig. 5 be employing uSSD that one embodiment of the invention the provides system that realizes buffer memory read in advance schematic flow sheet;
Fig. 6 is the command process schematic flow sheet that uSSD that one embodiment of the invention provides realizes the system of buffer memory;
Fig. 7 A is the vertical view of the uSSD that provides of one embodiment of the invention;
Fig. 7 B is the upward view of the uSSD that provides of one embodiment of the invention;
Fig. 7 C is the front view of the uSSD that provides of one embodiment of the 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. 1, the system 100 that provides a kind of uSSD of employing to realize buffer memory in the first embodiment of the present invention, comprising:
Read module 20 for receiving reading order, according to the storage condition of data corresponding to described reading order, reads from described solid state hard disc or described memory buffer;
In this embodiment, by module 10 is set, by uSSD(, be embedded micro solid state hard disc) be set to the memory buffer of solid state hard disc, for solid state hard disc provides the buffer memory of data.When host computer system receives reading order or writes order, respectively by read module 20 according to the storage condition of data corresponding to described reading order, from described solid state hard disc or described memory buffer, read.The logical block addresses corresponding to data of preferably, storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form; Described read module 20 is the address in described memory buffer by data corresponding to reading order described in the described table lookup of inquiry.Thus, improved the speed that data read.In addition, writing module 30 is according to described memory buffer working condition, data corresponding to said write order are write in described solid state hard disc or described memory buffer, when processing host order, Host Command is carried out to optimal treatment, improve the efficiency of system storage.USSD is used as to cache(cache memory) can improve the easy of solid state hard disc, and its cost will effectively reduce.
Referring to Fig. 2, in the second embodiment of the present invention, described system 100 also comprises:
Described read module 20 comprises:
Reading submodule 22, while existing for being judged as at described judgement submodule 21, reads from described memory buffer the data that described reading order is corresponding; And be judged as while not existing at described judgement submodule 21, from described solid state hard disc, read the data that described reading order is corresponding.
In this embodiment, cache module 40, after described memory buffer arranges, stores the partial data of solid state hard disc in described memory buffer into; And receiving reading order, judge whether the data that first submodule 21 judges that described reading order is corresponding are stored in described memory buffer; 22 of reading submodule from this memory buffer reading out data, have improved the efficiency that data read when data corresponding to described reading order are stored in described memory buffer.
Participate in Fig. 2, in the third embodiment of the present invention, described system 100 also comprises:
Buffer state memory judge module 60, for receiving while writing order, judges described memory buffer duty;
In described memory buffer, receive while writing order, said write module 30, when the described memory buffer duty of described buffer state memory judge module 60 judgement is busy condition, is written to described solid state hard disc by data corresponding to said write order;
When the described memory buffer duty of described buffer state memory judge module 60 judgement is idle condition, data corresponding to said write order are written to described memory buffer.
In this embodiment, data replacement module 50 can judge according to certain algorithm the cold and hot degree of data, and what in assurance uSSD, preserve is relatively hot data, the efficiency reading to improve data.General, this algorithm is statistic algorithm, this statistic algorithm is added up the access times of unit, thereby judges the cold and hot degree of data.In addition, buffer state memory judge module 60.USSD when processing reading order, the data that first can judge this reading order by buffer state memory judge module 60 whether in uSSD, if; directly from uSSD, would read, if do not existed, from hard disk, read.
Referring to Fig. 2, in the fourth embodiment of the present invention, described system 100 also comprises:
When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.
In this embodiment, when uSSD is more during new data, the data on corresponding hard disk also will be upgraded; When the data of hard disk are updated, the data that are buffered in uSSD also will be upgraded; Be that both synchronously upgrade.In addition, whether data update module 70 can directly send to corresponding hard disk according to the order of the Determines main frame of uSSD, when Host Command is during directly from hardware accessing data sampling, need the data of buffer memory in corresponding mechanism uSSD and the data in hard disk to be consistent.During from solid state hard disc the inside reading out data, if these data do not have in uSSD the inside, operation can be simultaneously this Data Update to uSSD the inside.Now uSSD is as being buffered in work.
In above-mentioned a plurality of embodiment, a plurality of modules of described system 100 can be software units, hardware cell or software and hardware combining unit.A plurality of modules can be arranged in uSSD.
Referring to Fig. 3, in the fifth embodiment of the present invention, a kind of uSSD of employing realizes the method for buffer memory, and described method comprises the steps:
Step S301, uSSD is set to the memory buffer of solid state hard disc; This step is setting steps, by module 10 is set, realizes.
Step S302, receives reading order, according to the storage condition of data corresponding to described reading order, from described solid state hard disc or described memory buffer, reads; This step is read step, by read module 20, is realized;
Step S303, receives and writes order, according to described memory buffer working condition, data corresponding to said write order is write in described solid state hard disc or described memory buffer.This step is write step, by writing module 30, is realized.
In this embodiment, adopt uSSD as cache(cache memory), preferred by the data buffer storage of solid state hard disc in described memory buffer, improve the access rate of system data, reduce the volume of solid state hard disc, and strengthen the extensibility of power system capacity.The logical block addresses corresponding to data of preferably, storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form; In described read step, by inquiring about reading order is corresponding described in described table lookup the data address in described memory buffer.
In the sixth embodiment of the present invention, after step S301, also comprise:
The partial data of described solid state hard disc is stored in described memory buffer; This step is realized by cache module 40.
Described step S302 comprises:
Receive reading order, judge whether the data that described reading order is corresponding are stored in described memory buffer; This step is by judging submodule 21 realizations;
If so, from described memory buffer, read the data that described reading order is corresponding; This step is realized by reading submodule 22;
If not, from described solid state hard disc, read the data that described reading order is corresponding; This step is realized by reading submodule 22.
In the seventh embodiment of the present invention, described method also comprises:
Data replacement step: the data in described memory buffer are divided into dsc data and cold data, and described dsc data is replaced to described cold data; This step is realized by data replacement module 50; Or
Buffer state memory determining step: receiving while writing order, judge described memory buffer work state; This step is realized by buffer state memory judge module 60.
Described step S303 comprises:
Receiving while writing order, and judging when described memory buffer duty is busy condition, data corresponding to said write order are being written to described solid state hard disc; This step is realized by buffer state memory judge module 60 and writing module.
Receiving while writing order, and judging when described memory buffer duty is idle condition, data corresponding to said write order are being written to described memory buffer; This step is realized by buffer state memory judge module 60 and writing module.
Preferably, described method also comprises:
Data Update step: when described memory buffer is more during new data, data corresponding on described solid state hard disc are also upgraded; When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.This step is realized by data update module 70.
In one embodiment of the invention, when uSSD is configured to cache first, the partial data of solid state hard disc is read in uSSD in advance, read module 20 also can first read the content reading in advance in uSSD at the pre-reading order of receiving main frame.Cold and hot degree according to data in follow-up use procedure is different, and uSSD can become dsc data by cold data replacement; The order that writing module 30 receives from main frame, carries out corresponding processing according to current situation.As sent reading order to uSSD when main frame, and during the data that in uSSD, this reading order of buffer memory is not corresponding, should directly this order be sent to corresponding hard disk to read; When main frame sends while writing order, according to the current situation of uSSD, this is write to order and carries out corresponding processing, if uSSD in idle condition or busy condition not relatively, first data can be written in uSSD, at uSSD during in busy state, the data solid state hard disc that can write direct.
Referring to Fig. 4, the system that provides in one embodiment of the invention a kind of uSSD of employing to realize cache, is applied in the host computer system based on hard disk, and the system that realizes cache by this employing uSSD realizes data processing method and comprises:
First uSSD and solid state hard disc are all connected on host data bus.Read in advance processing mode as shown in Figure 5, comprising:
Step (1): uSSD is configured to cache, and uSSD reads in uSSD by the partial data in hard disk in advance;
Step (2): host computer system is sent pre-reading order, uSSD reads from hard disk the data that read in advance uSSD;
Step (3): meanwhile, uSSD divides data inside, according to specific algorithm, data is divided into cold data and dsc data, becomes dsc data by the cold data replacement in uSSD dynamically;
The command process flow process of uSSD as shown in Figure 6, comprising:
Step (4): uSSD receives Host Command, directly processes and returns, this situation is applicable to main frame reading out data and the data situation in uSSD, as shown in Fig. 6 solid arrow;
Step (5): main frame is given an order needs uSSD and hard disk to process, as shown in Fig. 6 dotted arrow simultaneously.This situation be applicable to main frame reading out data and data not in uSSD or main frame need to change etc. the data in hard disk and need to upgrade the situations such as data in uSSD and hard disk simultaneously;
Step (6): main frame is given an order and now uSSD is in busy state, and in the time of can not responding Host Command in time, as shown in Fig. 6 dash-dot arrows, this order can be skipped uSSD and directly hard disk be operated.
In one embodiment of the invention, after uSSD has configured first, uSSD can read some data in advance in hard disk in uSSD; Main frame, when sending pre-reading order, first reads the data that read in advance in uSSD; In the routine use process of host computer system, uSSD internal algorithm is divided into cold and hot data by data, and uSSD preserves relatively hot data; Host computer system is in the order sending hard disk operation, and uSSD can first receive Host Command, and uSSD internal algorithm can be processed Host Command, and according to different situations, corresponding Host Command carries out different command process flow processs.In addition, corresponding processing is carried out in the order that uSSD can send main frame according to the current state of self, uSSD can learn that whether self is in busy state, whether during in busy state according to specific algorithm dynamic calculation out, according to uSSD, whether in busy state, can affect the processing to Host Command, when uSSD is during in busy state, now host write command can first not write uSSD by data, can be relatively slow because now write uSSD speed.USSD can will leave corresponding LBA (the Logical Block Address of the data in uSSD in, logical block addresses) with the form of showing, leave in the inner DRAM of uSSD easy-to-look-up, the reading order that main frame sends comprises the LBA reading, only this LBA need be searched in corresponding table, speed is very fast.
As shown in Figure 7, the uSSD providing in one embodiment of the invention has advantages of that volume is little and integrated level is high, can be incorporated into very easily above computer main board etc., serial hardware driver interface without extra SATA(Serial Advanced Technology Attachment(based on industry standard) interface module, without extra supply module, and BGA interface has the advantages such as signal quality is better when connecting.Its practical implementation of the Host Command that uSSD receives and traditional hard disk are also different.
In sum, the present invention is set to the memory buffer of solid state hard disc by uSSD; Receiving reading order, according to the storage condition of data corresponding to described reading order, from described solid state hard disc or described memory buffer, read; Further receive and write order, according to described memory buffer working condition, data corresponding to said write order are write in described solid state hard disc or described memory buffer.Thus, improved the storage efficiency of host computer system.Preferably, read in advance data in hard disk in advance in uSSD, and the correlation module by uSSD carries out optimal treatment to Host Command when processing host order, improve the efficiency of system storage.The algorithm of the uSSD providing in the embodiment of the present invention guarantees that the performance of hard disk can not decline, and the controllability of amount of capacity can be stronger simultaneously.In addition, so can not save the cost of space and interface because uSSD does not need SATA interface module.
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. adopt uSSD to realize a method for buffer memory, it is characterized in that, described method comprises the steps:
Setting steps: uSSD is set to the memory buffer of solid state hard disc;
Read step: receive reading order, according to the storage condition of data corresponding to described reading order, read from described solid state hard disc or described memory buffer;
Write step: receive and write order, according to described memory buffer working condition, data corresponding to said write order are write in described solid state hard disc or described memory buffer.
2. method according to claim 1, is characterized in that, after described setting steps, also comprises:
The partial data of described solid state hard disc is stored in described memory buffer;
Described read step comprises:
Receive reading order, judge whether the data that described reading order is corresponding are stored in described memory buffer;
If so, from described memory buffer, read the data that described reading order is corresponding;
If not, from described solid state hard disc, read the data that described reading order is corresponding.
3. method according to claim 1, is characterized in that, described method also comprises:
Data replacement step: the data in described memory buffer are divided into dsc data and cold data, and described dsc data is replaced to described cold data; Or
Buffer state memory determining step: receiving while writing order, judge described memory buffer work
Make state; Said write step comprises:
Receiving while writing order, and judging when described memory buffer duty is busy condition, data corresponding to said write order are being written to described solid state hard disc;
Receiving while writing order, and judging when described memory buffer duty is idle condition, data corresponding to said write order are being written to described memory buffer.
4. method according to claim 1, is characterized in that, the logical block addresses corresponding to data of storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form;
In described read step, by inquiring about reading order is corresponding described in described table lookup the data address in described memory buffer.
5. method according to claim 1, is characterized in that, described method also comprises:
Data Update step: when described memory buffer is more during new data, data corresponding on described solid state hard disc are also upgraded; When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.
6. adopt uSSD to realize a system for buffer memory, it is characterized in that, comprising:
Module is set, for uSSD, is set to the memory buffer of solid state hard disc;
Read module for receiving reading order, according to the storage condition of data corresponding to described reading order, reads from described solid state hard disc or described memory buffer;
Writing module, writes order for receiving, and according to described memory buffer working condition, data corresponding to said write order is write in described solid state hard disc or described memory buffer.
7. system according to claim 6, is characterized in that, described system also comprises:
Cache module, for storing the partial data of described solid state hard disc into described memory buffer;
Described read module comprises:
Judgement submodule, for receiving reading order, judges whether the data that described reading order is corresponding are stored in described memory buffer;
Reading submodule, while existing for being judged as at described judgement submodule, reads from described memory buffer the data that described reading order is corresponding; And be judged as while not existing at described judgement submodule, from described solid state hard disc, read the data that described reading order is corresponding.
8. system according to claim 6, is characterized in that, described system also comprises:
Data replacement module, for the data in described memory buffer being divided into dsc data and cold data, and replaces described cold data by described dsc data;
Buffer state memory judge module, for receiving while writing order, judges described memory buffer duty;
In described memory buffer, receive while writing order, said write module, when described buffer state memory judge module judges that described memory buffer duty is busy condition, is written to described solid state hard disc by data corresponding to said write order;
When described buffer state memory judge module judges that described memory buffer duty is idle condition, data corresponding to said write order are written to described memory buffer.
9. system according to claim 6, is characterized in that, the logical block addresses corresponding to data of storing in described memory buffer leaves in the dynamic RAM of described memory buffer with form;
Described read module is by the address of data corresponding to reading order in described memory buffer described in the described table lookup of inquiry.
10. system according to claim 6, is characterized in that, described system also comprises:
Data update module, for when described memory buffer is more during new data, also upgrades data corresponding on described solid state hard disc; Or
When the data of described solid state hard disc are updated, the data that are buffered in described memory buffer are also upgraded.
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| CN108874309A (en) * | 2018-05-25 | 2018-11-23 | 新华三技术有限公司 | The method and apparatus of physical block in a kind of management solid state hard disk |
| CN108874309B (en) * | 2018-05-25 | 2021-07-23 | 新华三技术有限公司 | Method and device for managing physical blocks in solid state disk |
| CN109558386A (en) * | 2018-11-26 | 2019-04-02 | 北京微播视界科技有限公司 | A kind of caching method of client data, device, equipment and medium |
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