CN108710583A - Management method, device, computer equipment and the medium in SSD write buffers area - Google Patents
Management method, device, computer equipment and the medium in SSD write buffers area Download PDFInfo
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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
- G06F12/0802—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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
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Abstract
The present invention relates to the management method in SSD write buffers area, device, computer equipment and medium, this method includes obtaining standby capacitance in real time；The data volume that can be written during standby electricity is obtained according to standby capacitance；The size in write buffer area is set according to data volume；Record is when in time detection time and standby capacitance to NAND.The present invention is by obtaining standby capacitance in real time, calculating it, maximum can normal working hours after powered-off fault, the maximum amount of data of write-in is calculated according to the working time, adjust the size in write buffer area, so that NAND is written within the normal working hours of standby capacitance in data, realize dynamic adjustment writing buffer size, user data loss when avoiding the problem that being abnormal power down.
Description
Technical field
The present invention relates to solid state disks, more specifically refer to that the management method in SSD write buffers area, device, computer are set
Standby and medium.
Background technology
SSD, that is, solid state disk has been widely used in various occasions, since it is in performance, power consumption, environmental suitability etc.
The outstanding index of aspect, application scenarios also gradually move towards enterprise-level from consumer.
As shown in Figure 1, typically writing flow inside SSD and being：Host submits write order to the front-end module of SSD；The front ends SSD
Order is divided into map unit (typical such as 4KB) by module, is submitted to read-write buffer zone module；Read and write buffer management module from
(typical such as DRAM) allocation space in Memory；According to the buffer space distributed, the data transmission of front end and host is established；
After completing data transmission, submit operation requests to mapping table management module；Mapping table management module is responsible for corresponding requests distribution
Physical address, and update corresponding mapping item；Submit operation requests to rear module, rear module is initiated according to physical address
To NAND write requests；NAND operation requests are waited for complete, control operation requests return to upper layer module successively；Front-end module receives
After the control operation requests of completion, order write request is completed.
Under enterprise-level application scene, the requirement for data reliability and abnormality processing is very high.And SSD is for reality
The now data write-in of high speed, needs to retain one piece of memory cache in memory.Host side sends write order, data
It is first written in memory cache, it is the concurrency for making full use of rear end NAND to write then to be then written on NAND, is needed
To use the memory cache in DRAM, the data of caching host write-in, when the data of some order are written to
After SSD, the reply host write order is completed, under usual situation, when the data in memory cache meet rear end
When demand is written in concurrency, the write request to NAND is initiated.
As shown in Fig. 2, SSD board carries idle capacity, it can be switched to standby electricity when power down occurs and work on a period of time,
To which the data in memory cache are written to NAND.In SSD internal systems, there are a detection of power loss moulds
Block, the generation for monitoring external power down time notify modules successively after detecting legal triggering information.Front end mould
After block receives the information, disconnection is linked with host side, no longer carries out the read-write transmission of data；And mapping table management module is then hung
Internal operation is played, the write-in of user data in memory cache is only handled；Rear module abandons, hangs up non-user
The operation requests of data only handle memory cache data write request.
But when due to powered-off fault, the data in memory cache can lose, so as to cause host
The loss of data of write-in, cannot meet the application demand of enterprise-level, need to increase standby electric capacitance at this time come when ensureing powered-off fault
The write-in of user data introduces standby electric protection scheme and the data in memory cache is written to NAND to realize
On, but in whole life cycle, due to the aging of capacitance, capacitance and the charging time that can be provided are in attenuation trend,
So in existing product, the standby electric capacitance provisioned in manufacture initial stage, in SSD later stage of life, can because of not enough power supply, from
And data in memory cache cannot be completely written in powered-off fault, so as to cause user data loss.
Therefore, it is necessary to design a kind of management method, realizes dynamic adjustment writing buffer size, avoid being abnormal power down
When user data loss the problem of.
Invention content
It is an object of the invention to overcome the deficiencies of existing technologies, the management method in SSD write buffers area, device, meter are provided
Calculate machine equipment and medium.
To achieve the above object, the present invention uses following technical scheme：The management method in SSD write buffers area, the method
Including：
Obtain standby capacitance in real time；
The data volume that can be written during standby electricity is obtained according to standby capacitance；
The size in write buffer area is set according to data volume；
Record is when in time detection time and standby capacitance to NAND.
Its further technical solution is：Record after step in time detection time and standby capacitance to NAND, and also
Including：
Respond host write order；
Obtain the time interval of current time and last detection time；
Judge whether time interval is more than threshold value；
If so, returning to the step of obtaining standby capacitance in real time；
If it is not, the step of then returning to the time interval for obtaining current time and last detection time.
Its further technical solution is：The step of obtaining the data volume that can be written during standby electricity according to standby capacitance, packet
Include step in detail below：
Last time detection time and electricity are loaded from NAND；
According to electricity and SSD maximum power dissipations, the time that can be supported when standby electricity work is calculated；
Write performance under the time that can be supported when according to standby electricity work, SSD steady state situations, calculates corresponding data
Amount, as the data volume that can be written during standby electricity.
Its further technical solution is：In the step of size in write buffer area is arranged according to data volume, specifically setting is slow
The size for depositing area is not more than data volume.
The present invention also provides the managing device in SSD write buffers area, including capacity acquisition unit, data volume acquiring unit,
Size setting unit and recording unit；
The capacity acquisition unit, for obtaining standby capacitance in real time；
The data volume acquiring unit, for obtaining the data volume that can be written during standby electricity according to standby capacitance；
The size setting unit, the size for write buffer area to be arranged according to data volume；
The recording unit, for recording when in time detection time and standby capacitance to NAND.
Its further technical solution is：Further include response unit, time interval acquiring unit and judging unit；
The response unit, for responding host write order；
The time interval acquiring unit, the time interval for obtaining current time and last detection time；
The judging unit, for judging whether time interval is more than threshold value.
Its further technical solution is：The data volume acquiring unit include data obtaining module, time computing module with
And data volume computing module；
Described information acquisition module, for loading last time detection time and electricity from NAND；
The time computing module can support when for according to electricity and SSD maximum power dissipations, calculating for electricity work
Time；
The data volume computing module, writing under the time that can be supported when for according to standby electricity work, SSD steady state situations
Enter performance, calculate corresponding data volume, as the data volume that can be written during standby electricity.
The present invention also provides a kind of computer equipment, including memory, processor and it is stored on the memory simultaneously
The computer program that can be run on the processor, the processor realize above-mentioned SSD when executing the computer program
The management method in write buffer area.
The present invention also provides a kind of medium, it includes journey that the media storage, which has computer program, the computer program,
Sequence instructs, and described program instructs the manager for making the processor execute above-mentioned SSD write buffers area when being executed by a processor
Method.
Compared with the prior art, the invention has the advantages that：The management method in the SSD write buffers area of the present invention, by obtaining
Take standby capacitance in real time, calculate its after powered-off fault maximum can normal working hours, write-in is calculated according to the working time
Maximum amount of data, the size in adjustment write buffer area so that NAND is written within the normal working hours of standby capacitance in data, realizes
Dynamic adjustment writing buffer size, user data loss when avoiding the problem that being abnormal power down.
The invention will be further described in the following with reference to the drawings and specific embodiments.
Description of the drawings
Fig. 1 is that the flow chart of data is written in the SSD of the prior art；
The flow chart of data protection when Fig. 2 is the enterprise-level powered-off fault of the prior art；
Fig. 3 is the schematic flow diagram one of the management method in the SSD write buffers area that a specific embodiment of the invention provides；
Fig. 4 is the schematic flow diagram two of the management method in the SSD write buffers area that a specific embodiment of the invention provides；
Fig. 5 is the schematic flow diagram for the sub-step that Fig. 3 specific embodiments provide；
Fig. 6 is the schematic block diagram of the managing device in the SSD write buffers area that a specific embodiment of the invention provides；
Fig. 7 is the schematic block diagram for the data volume acquiring unit that Fig. 6 specific embodiments provide；
Fig. 8 is a kind of schematic block diagram for computer equipment that one embodiment of the application provides.
Specific implementation mode
In order to more fully understand the present invention technology contents, with reference to specific embodiment to technical scheme of the present invention into
One step introduction and explanation, but not limited to this.
It should be appreciated that ought use in this specification and in the appended claims, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, element, component and/or its presence or addition gathered.
It is also understood that the term used in this present specification is merely for the sake of the mesh for describing specific embodiment
And be not intended to limit the application.As present specification and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singulative, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combinations and all possible combinations of one or more of associated item listed, and includes these combinations.
The specific embodiment as shown in Fig. 3~8, the management method in SSD write buffers provided in this embodiment area, device, meter
Machine equipment and medium are calculated, various solid state disks can be used in during carrying out power down abnormal data protection, realizes dynamic
Adjust writing buffer size, user data loss when avoiding the problem that being abnormal power down.
Referring to Fig. 3, Fig. 3 is the schematic flow diagram of the management method in SSD write buffers provided in this embodiment area, such as Fig. 3
Shown, the management method in SD write buffers area includes step S101~S107：
S101, standby capacitance in real time is obtained.
In the present embodiment, by the way of periodically detecting standby capacitance, standby capacitance is obtained in real time, at this time standby electricity
The electricity for holding capacity is most true, adjusts buffer capacity according to real-time standby capacitance, can solve enterprise-level SSD life
Because capacitance decline causes standby electricity insufficient in period, and then when leading to powered-off fault the problem of user data loss.
S102, the data volume that can be written during standby electricity is obtained according to standby capacitance.
Specifically, according to the real-time standby capacitance detected, standby electric institute energy is calculated in power consumption when working in conjunction with SSD
Working time calculates the standby electric phase according to the performance (being also lowest performance) of standby electric institute's up time and SSD steady operations
Between the data volume that can be written, which is then that can completely write data in memory cache in powered-off fault
The data volume entered stores data according to the data volume, will not lead to user data loss.
S103, the size that write buffer area is set according to data volume.
In the present embodiment, the size of specifically setting buffer area is not more than data volume, according to the writing calculated, adjusts
Whole writing buffer size makes it be not more than the threshold value, it can be ensured that data in memory cache can completely be written, keep away
Exempt from user data loss.
S104, record are when in time detection time and standby capacitance to NAND.
Record is in time detection time and standby capacitance to NAND, for restoring after power down, after each powered-off fault,
When restoring data, the size for combining detection time and standby capacitance adjustment write buffer area is needed, to completely write data
Enter, while ensureing that user data is not lost.
It is periodically detected standby capacitance, and Cache sizes are write in dynamic adjustment accordingly, so can ensure in entire Life Cycle
The integrality of user data when interim powered-off fault.
S105, response host write order.
Upon power-up of the system, the write buffer area of SSD needs to respond the write order of host, carries out the write-in and storage of data,
During responding host write order, the size for periodically adjusting buffer area is needed.
S106, the time interval for obtaining current time and last detection time.
After system electrification, before the non-volatile region of power down (such as NOR/NAND, the present embodiment in by taking NAND as an example) load
Secondary detection information：Detection time (T_Last_Check) and electricity (Cap_Last_Check).About the time, for having reality
The SSD of clock (RTC) module can use the true time；And can have equivalent effect for the SSD without real-time clock (RTC) module
The relative time of fruit, i.e. Data writing time stamp power on number and work as the sum of time power-on time as current time；By current
Time interval of the phase difference of time and the last detection time being recorded in NAND as the two.
S107, judge whether time interval is more than threshold value.
If so, the step of returning to S101；
If it is not, then returning to S106 steps.
When time interval reaches threshold value, then starts the flow for updating write buffer area size according to standby capacitance, adjust in real time
Whole write buffer area size avoids occurring power down suddenly and write buffer area size is more than the data volume that can be written and causes number of users
The phenomenon that according to losing.
Specifically, it is (theoretical worst according to SSD power consumptions (manufacture measured value), stable state write performance when time interval is more than threshold value
Write performance) etc. factors, calculate the data writing that can be done during standby electricity, according to when the standby electric capacitance of time detection, adjust again
Whole writing buffer size, record is when time detection information：Detection time, capacitance electricity etc..
Dynamic detection calculates it standby for capacitance, and according to the write performance under the stable state of the disk, power consumption at runtime
During electricity work, the maximum write-in data volume that can be supported, according to the ultrahigh speed at this maximum write-in data volume constrained operation moment
Buffer system size, that is, write buffer area size make the data volume of its any time caching be no more than revaluate, can ensure
Enterprise-level SSD will not lead to loss of data in whole life cycle because of powered-off fault.
Referring to Fig. 5, Fig. 5 is the schematic flow diagram for the sub-step that Fig. 3 specific embodiments provide, as shown in figure 5, S103,
The step of data volume that can be written during standby electricity being obtained according to standby capacitance, including step in detail below：
S1031, last time detection time and electricity are loaded from NAND；
S1032, the time that can be supported when working according to electricity and SSD maximum power dissipations, calculating standby electricity；
S1033, according to standby electricity work when can support time, the write performance under SSD steady state situations, calculating is corresponding
Data volume, as the data volume that can be written during standby electricity.
Electricity when what above-mentioned standby capacitance referred to is standby electricity.
It is divided by according to electricity and SSD maximum power dissipations, the time that can be supported when standby electricity work is obtained, according to SSD stable state feelings
Write performance under shape, that is, the speed that is written can obtain the data that can be written during standby electricity according to time and speed
Amount, such as：SSD maximum power dissipations are 4mw, electricity 0.12mwh, then the time 30ms that can be supported when standby electricity work, SSD stable states
Write performance under situation is 200MB/s, then the data volume being written at this time is 6MB, and the size in setting write buffer area is 6MB.
The management method in above-mentioned SSD write buffers area calculates it after powered-off fault by obtaining standby capacitance in real time
Maximum can adjust the size in write buffer area normal working hours according to the maximum amount of data of working time calculating write-in so that number
NAND is written according within the normal working hours of standby capacitance, realizes dynamic adjustment writing buffer size, avoids being abnormal
When electric the problem of user data loss.
Referring to Fig. 6, Fig. 6 is the schematic block diagram of the managing device in SSD write buffers provided in this embodiment area, such as Fig. 6
It is shown, the managing device in SSD write buffers area include capacity acquisition unit 1, data volume acquiring unit 2, size setting unit 3 and
Recording unit 4.
Capacity acquisition unit 1, for obtaining standby capacitance in real time.
Data volume acquiring unit 2, for obtaining the data volume that can be written during standby electricity according to standby capacitance.
Size setting unit 3, the size for write buffer area to be arranged according to data volume.
Recording unit 4, for recording when in time detection time and standby capacitance to NAND.
Preferably, above-mentioned device further includes response unit 5, time interval acquiring unit 6 and judging unit 7.
Response unit 5, for responding host write order.
Time interval acquiring unit 6, the time interval for obtaining current time and last detection time.
Judging unit 7, for judging whether time interval is more than threshold value.
Referring to Fig. 7, Fig. 7 is the schematic block diagram of data volume acquiring unit 2 provided in this embodiment, as shown in fig. 7, data
It includes data obtaining module 21, time computing module 22 and data volume computing module 23 to measure acquiring unit 2.
Data obtaining module 21, for loading last time detection time and electricity from NAND.
Time computing module 22, for according to electricity and SSD maximum power dissipations, calculate can be supported when standby electricity work when
Between.
Data volume computing module 23, the write-in under the time that can be supported when for according to standby electricity work, SSD steady state situations
Performance calculates corresponding data volume, as the data volume that can be written during standby electricity.
It is apparent to those skilled in the art that for convenience of description and succinctly, the SSD of foregoing description
The managing device in write buffer area and the specific work process of unit, can refer to corresponding processes in the foregoing method embodiment,
This is repeated no more.
The managing device in above-mentioned SSD write buffers area can be implemented as a kind of form of computer program, and computer program can
To be run on computer equipment as shown in Figure 8.
Referring to Fig. 8, Fig. 8 is a kind of schematic block diagram of computer equipment provided by the embodiments of the present application.The computer
700 equipment of equipment can be terminal or server.
With reference to Fig. 8, which includes processor 720, memory and the net connected by system bus 710
Network interface 750, wherein memory may include non-volatile memory medium 730 and built-in storage 740.
The non-volatile memory medium 730 can storage program area 731 and computer program 732.The computer program 732
It is performed, processor 720 may make to execute the management method in any one SSD write buffers area.
The processor 720 supports the operation of entire computer equipment 700 for providing calculating and control ability.
The built-in storage 740 provides environment for the operation of the computer program 732 in non-volatile memory medium 730, should
When computer program 732 is executed by processor 720, processor 720 may make to execute the manager in any one SSD write buffers area
Method.
The network interface 750 such as sends the task dispatching of distribution for carrying out network communication.Those skilled in the art can manage
It solves, structure is not constituted only with the block diagram of the relevant part-structure of application scheme to the application side shown in Fig. 8
The restriction for the computer equipment 700 that case is applied thereon, specific computer equipment 700 may include more than as shown in the figure
Or less component, it either combines certain components or is arranged with different components.Wherein, the processor 720 is for transporting
Row program code stored in memory, to realize following steps：
Obtain standby capacitance in real time；
The data volume that can be written during standby electricity is obtained according to standby capacitance；
The size in write buffer area is set according to data volume；
Record is when in time detection time and standby capacitance to NAND.
In one embodiment, the processor 720 is realized described for running program code stored in memory
Record also realizes following steps after in time detection time and standby capacitance to NAND：
Respond host write order；
Obtain the time interval of current time and last detection time；
Judge whether time interval is more than threshold value；
Standby capacitance in real time is obtained if so, returning；
If it is not, then returning to the time interval for obtaining current time and last detection time.
In one embodiment, wherein what the processor 720 was used to be written during obtaining standby electricity according to standby capacitance
In data volume, including：Last time detection time and electricity are loaded from NAND；According to electricity and SSD maximum power dissipations, calculate
The time that can be supported when standby electricity work；And the time that can be supported when according to standby electricity work, the write-in under SSD steady state situations
Performance calculates corresponding data volume, as the data volume that can be written during standby electricity.
Wherein, the processor 720 is used to be arranged in the size in write buffer area according to data volume, and buffer area is specifically arranged
Size be not more than data volume.
It should be appreciated that in the embodiment of the present application, processor 720 can be central processing unit (Central
Processing Unit, CPU), which can also be other general processors, digital signal processor (Digital
Signal Processor, DSP), application-specific integrated circuit (Application Specific Integrated Circuit,
ASIC), ready-made programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic
Device, discrete gate or transistor logic, discrete hardware components etc..Wherein, general processor can be microprocessor or
Person's processor can also be any conventional processor etc..
It will be understood by those skilled in the art that 700 structure of computer equipment shown in Fig. 8 is not constituted and is set to computer
Standby 700 restriction may include either combining certain components or different component cloth than illustrating more or fewer components
It sets.
In addition, the present embodiment additionally provides a kind of medium, media storage has the computer program, the computer program to include
Program instruction, described program instruct the management for making the processor execute above-mentioned SSD write buffers area when being executed by a processor
Method.
It is apparent to those skilled in the art that for convenience of description and succinctly, Jie of foregoing description
The specific work process of matter, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
It is above-mentioned only with embodiment come the technology contents that further illustrate the present invention, in order to which reader is easier to understand, but not
It represents embodiments of the present invention and is only limitted to this, any technology done according to the present invention extends or recreation, by the present invention's
Protection.Protection scope of the present invention is subject to claims.
Claims (9)
- The management method in 1.SSD write buffers area, which is characterized in that the method includes：Obtain standby capacitance in real time；The data volume that can be written during standby electricity is obtained according to standby capacitance；The size in write buffer area is set according to data volume；Record is when in time detection time and standby capacitance to NAND.
- 2. the management method in SSD write buffers according to claim 1 area, which is characterized in that record when time detection time with And after the step in standby capacitance to NAND, further include：Respond host write order；Obtain the time interval of current time and last detection time；Judge whether time interval is more than threshold value；If so, returning to the step of obtaining standby capacitance in real time；If it is not, the step of then returning to the time interval for obtaining current time and last detection time.
- 3. the management method in SSD write buffers according to claim 1 or 2 area, which is characterized in that obtained according to standby capacitance The step of data volume that can be written during standby electricity, including step in detail below：Last time detection time and electricity are loaded from NAND；According to electricity and SSD maximum power dissipations, the time that can be supported when standby electricity work is calculated；Write performance under the time that can be supported when according to standby electricity work, SSD steady state situations, calculates corresponding data volume, work For the data volume that can be written during standby electricity.
- 4. the management method in SSD write buffers according to claim 3 area, which is characterized in that write according to data volume setting slow In the step of depositing the size in area, the size that buffer area is specifically arranged is not more than data volume.
- The managing device in 5.SSD write buffers area, which is characterized in that set including capacity acquisition unit, data volume acquiring unit, size Set unit and recording unit；The capacity acquisition unit, for obtaining standby capacitance in real time；The data volume acquiring unit, for obtaining the data volume that can be written during standby electricity according to standby capacitance；The size setting unit, the size for write buffer area to be arranged according to data volume；The recording unit, for recording when in time detection time and standby capacitance to NAND.
- 6. the managing device in SSD write buffers according to claim 5 area, which is characterized in that further include response unit, time Interval acquiring unit and judging unit；The response unit, for responding host write order；The time interval acquiring unit, the time interval for obtaining current time and last detection time；The judging unit, for judging whether time interval is more than threshold value.
- 7. the managing device in SSD write buffers according to claim 6 area, which is characterized in that the data volume acquiring unit Including data obtaining module, time computing module and data volume computing module；Described information acquisition module, for loading last time detection time and electricity from NAND；The time computing module, for according to electricity and SSD maximum power dissipations, calculate can be supported when standby electricity work when Between；The data volume computing module, the write-in under the time that can be supported when for according to standby electricity work, SSD steady state situations Can, corresponding data volume is calculated, as the data volume that can be written during standby electricity.
- 8. a kind of computer equipment, which is characterized in that including memory, processor and be stored on the memory and can be in institute The computer program run on processor is stated, the processor is realized when executing the computer program as in Claims 1-4 The management method in the SSD write buffers area described in any one.
- 9. a kind of medium, which is characterized in that it includes that program refers to that the media storage, which has computer program, the computer program, It enables, described program instruction makes the processor execute as described in Claims 1-4 any one when being executed by a processor The management method in SSD write buffers area.
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| CN110427289A (en) * | 2019-07-31 | 2019-11-08 | 东莞记忆存储科技有限公司 | The method and device that automatic test SSD power down influences data consistency |
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| CN113760074A (en) * | 2021-08-24 | 2021-12-07 | 深圳大普微电子科技有限公司 | Standby power system and solid state disk |
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