CN107422992A - Journal store methods and system during a kind of SSD operations - Google Patents

Journal store methods and system during a kind of SSD operations Download PDF

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Publication number
CN107422992A
CN107422992A CN201710641083.6A CN201710641083A CN107422992A CN 107422992 A CN107422992 A CN 107422992A CN 201710641083 A CN201710641083 A CN 201710641083A CN 107422992 A CN107422992 A CN 107422992A
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China
Prior art keywords
increment
written
data
buffering areas
delta data
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CN201710641083.6A
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Chinese (zh)
Inventor
苗森
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郑州云海信息技术有限公司
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Priority to CN201710641083.6A priority Critical patent/CN107422992A/en
Publication of CN107422992A publication Critical patent/CN107422992A/en

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F3/0601Dedicated interfaces to storage systems
    • G06F3/0602Dedicated interfaces to storage systems specifically adapted to achieve a particular effect
    • G06F3/061Improving I/O performance
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F3/0601Dedicated interfaces to storage systems
    • G06F3/0602Dedicated interfaces to storage systems specifically adapted to achieve a particular effect
    • G06F3/062Securing storage systems
    • G06F3/0623Securing storage systems in relation to content
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F3/0601Dedicated interfaces to storage systems
    • G06F3/0628Dedicated interfaces to storage systems making use of a particular technique
    • G06F3/0629Configuration or reconfiguration of storage systems
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F3/0601Dedicated interfaces to storage systems
    • G06F3/0668Dedicated interfaces to storage systems adopting a particular infrastructure
    • G06F3/0671In-line storage system
    • G06F3/0673Single storage device
    • G06F3/0679Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers
    • G06F2003/0691Digital input from or digital output to record carriers, e.g. RAID, emulated record carriers, networked record carriers buffering arrangements

Abstract

This application discloses Journal store methods during a kind of SSD operations and system, including:Delta data corresponding with metadata increment are written in the increment DDR buffering areas of its corresponding default size;After increment DDR buffer area data volumes are write completely, the base data in the basic DDR buffering areas of the delta data in increment DDR buffering areas and its corresponding preset ratio are written in flash.The embodiment of the present invention is by designing delta data come identification metadata increment, delta data are written in the increment DDR buffering areas of its corresponding default size, and when increment DDR buffering areas write full, just the base data in the basic DDR buffering areas of delta data and its corresponding preset ratio are written in flash, the influence to SSD read-write efficiencies is reduced, JM data storage quantity when also reducing power down.

Description

Journal store methods and system during a kind of SSD operations

Technical field

The present invention relates to Journal store methods during a kind of technical field of data storage, more particularly to SSD operations and it is System.

Background technology

SSD will receive the order progress such as read, write from host ends and foramt related operation when running, and It can newly be produced during operation or update such as L2P tables, trim bitmap and super block info system member numbers According to, and Journal modules (JM) are exactly that can correctly be preserved during its operation and management system in the major function of SSD disks Metadata, and can when upper electric normal recovery system metadata.Can correct management system metadata, just can guarantee that host Correct operation to SSD data, so the effect of JM modules is most important, and when being related to the management of metadata, JM has again can With efficiency and the place of performance boost.

By taking a kind of L2P tables this metadata as an example, in the prior art, when the operation of each user brings l2p change, JM Module all sends to lookup manager modules and writes super page request, such way be real-time metadata more Newly, the metadata brought by unexpected lower electricity will not be brought to lose, but such real-time update can influence to write process or other processes Efficiency.

Therefore, how a kind of on the low influence of SSD readwrite performances, and Journal preservation sides during efficient SSD operations are provided Method is that those skilled in the art needs to solve the problems, such as.

The content of the invention

In view of this, it is an object of the invention to provide Journal store methods during a kind of SSD operations and system, with drop The low influence to SSD read-write efficiencies, JM data storage quantity when also reducing power down.Its concrete scheme is as follows:

Journal store methods during a kind of SSD operations, including:

Delta data corresponding with metadata increment are written to the increment DDR buffering areas of its corresponding default size In;

When the increment DDR buffer area data volumes are write it is full after, by the delta data in the increment DDR buffering areas and with Base data in the basic DDR buffering areas of its corresponding preset ratio are written in flash.

Optionally, the preset ratio be using rebuild times of metadata after system electrification, delta data volumes and The ratio that base data volumes are calculated.

Optionally, in addition to:

Using the lba being stored in Journal in lower electric process, by its corresponding base numbers of delta data patch According to.

Optionally, it is described after the increment DDR buffer area data volumes write full, by the increment DDR buffering areas Base data in the basic DDR buffering areas of delta data and its corresponding preset ratio are written to the process in flash, Including:

When delta data less than the default size of the increment DDR buffering areas, then utilize in the increment DDR buffering areas Dummy data fill the remaining space in the increment DDR buffering areas, and the increment DDR buffer area data volumes are write completely, then will Base data in the basic DDR buffering areas of delta data and its corresponding preset ratio in the increment DDR buffering areas It is written in flash.

Optionally, the increasing that delta data corresponding with metadata increment are written to its corresponding default size The process in DDR buffering areas is measured, including:

Delta data are written in the local buffer of its corresponding default size;

After the local buffer data volumes are write completely, the delta data in the local buffer are written to In the increment DDR buffering areas of default size corresponding with the local buffer.

Optionally, process delta data being written in the local buffer of its corresponding default size, Including:

Delta data are written in the first local buffer of its corresponding default size;

After the first local buffer data volumes are write completely, using ping-pang forms, delta data are write Into the 2nd local buffer of its corresponding default size, so that delta data are alternately written into the first local In buffer and the 2nd local buffer.

Optionally, the increasing that delta data corresponding with metadata increment are written to its corresponding default size The process in DDR buffering areas is measured, including:

Delta data are written in the first increment DDR buffering areas of its corresponding default size;

After the first increment DDR buffer area data volumes are write completely, using ping-pang forms, delta data are write Into the second increment DDR buffering areas of its corresponding default size, so that delta data are alternately written into first increment In DDR buffering areas and the second increment DDR buffering areas.

The invention also discloses Journal during a kind of SSD operations to preserve system, including:

Cache memory module, for delta data corresponding with metadata increment to be written into its corresponding preset greatly In small increment DDR buffering areas;

Flash memory modules, for after the increment DDR buffer area data volumes write full, by the increment DDR buffering areas In delta data and its corresponding preset ratio basic DDR buffering areas in base data be written in flash.

Optionally, the cache memory module, including:

Local buffer sub-module storeds, for delta data to be written to the local of its corresponding default size In buffer;

Buffer memory submodule, for after the local buffer data volumes write full, by the local buffer In delta data be written in the increment DDR buffering areas of default size corresponding with the local buffer.

Optionally, the cache memory module, including:

First buffer memory unit, for delta data to be written to the first increment DDR of its corresponding default size In buffering area;

Second buffer memory unit, for after the first increment DDR buffer area data volumes write full, utilizing ping- Pang forms, delta data are written in the second increment DDR buffering areas of its corresponding default size, so that delta numbers According to being alternately written into the first increment DDR buffering areas and the second increment DDR buffering areas.

In the present invention, Journal store methods when SSD is run, including:Will delta data corresponding with metadata increment It is written in the increment DDR buffering areas of its corresponding default size;After increment DDR buffer area data volumes are write completely, by increment Base data in the basic DDR buffering areas of delta data and its corresponding preset ratio in DDR buffering areas are written to In flash.Delta data are written to and its phase by the embodiment of the present invention by designing delta data come identification metadata increment In the increment DDR buffering areas for the default size answered, and when increment DDR buffering areas write full, just by delta data and with its phase Base data in the basic DDR buffering areas for the preset ratio answered are written in flash, reduce the shadow to SSD read-write efficiencies Ring, JM data storage quantity when also reducing power down.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis The accompanying drawing of offer obtains other accompanying drawings.

Journal store method schematic flow sheets when Fig. 1 is a kind of SSD operations disclosed in the embodiment of the present invention;

Journal store method schematic flow sheets when Fig. 2 is another SSD operations disclosed in the embodiment of the present invention;

Journal preserves system structure diagram when Fig. 3 is a kind of SSD operations disclosed in the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.

The embodiment of the invention discloses Journal store methods during a kind of SSD operations, shown in Figure 1, this method bag Include:

Step S11:Delta data corresponding with metadata increment are written to the increment of its corresponding default size In DDR buffering areas.

Specifically, pre-establishing the corresponding relation of delta data and metadata increment, delta Data Identification member numbers are utilized According to increment, wherein, each delta data can be 8 bytes, and the default size of increment DDR buffering areas can be 4K.

Wherein, the increment DDR bufferings of its corresponding default size can be written in real time for guarantee delta data Area, establishes ping-pang increment DDR buffering areas, and specific ablation process includes step S111 and step S112;Wherein,

Step S111:Delta data are written in the first increment DDR buffering areas of its corresponding default size.

Specifically, first delta data can be written in the first increment DDR buffering areas of its corresponding 4K sizes.

Step S112:After the first increment DDR buffer area data volumes are write completely, using ping-pang forms, by delta numbers According to being written in the second increment DDR buffering areas of its corresponding default size, so that delta data are alternately written into the first increment In DDR buffering areas and the second increment DDR buffering areas.

Specifically, after the first increment DDR buffer area data volumes write full, using ping-pang forms, the second increasing is switched to DDR buffering areas are measured, delta data are written in the second increment DDR buffering areas, now the first increment DDR buffering areas are then carried out After need to operate, discharge data therein, when the second increment DDR buffer area data volumes are write it is full after, should in the first increment DDR buffering areas The no data is preserved, and therefore, delta data are continued to write into the first increment DDR buffering areas, and now the second increment DDR is buffered Qu Ze carry out after need to operate, discharge data therein, with this realize delta data be alternately written into the first increment DDR buffering areas and In second increment DDR buffering areas.

Step S12:When increment DDR buffer area data volumes are write it is full after, by the delta data in increment DDR buffering areas and with Base data in the basic DDR buffering areas of its corresponding preset ratio are written in flash.

Specifically, after delta data are write completely in increment DDR buffering areas, then the basic DDR of corresponding preset ratio is delayed The base data rushed in area, which are also together written in flash, to be preserved, wherein, preset ratio is to utilize first number after system electrification According to the ratio that is calculated of rebuild times, delta data volumes and base data volumes, metadata after system electrification The rebuild times need upper plate debugging to draw, for example, preset ratio is 1 to 3, i.e. whenever a delta data write flash In once, then also three parts of base data are write in flash, form 1 to 3 relation, every part of size of data can be 4K, certainly Preset ratio can also be adjusted according to practical application request, and then ensure the rebuild times in an OK range.

Wherein, when electric situation under generation, delta data are less than the default of increment DDR buffering areas in increment DDR buffering areas Size, write-in flash actions can not be triggered, and need the base data by delta data and corresponding preset ratio to be written to In flash, then the remaining space in dummy data filling increment DDR buffering areas can be utilized, by increment DDR buffer datas Amount is write completely, then by the basic DDR buffering areas of the delta data in increment DDR buffering areas and its corresponding preset ratio Base data are written in flash, to ensure that increment DDR buffering areas do not have delta loss of datas.

In practical application, except the normal preservation process of power-up state, lower electric process can also be included;Utilized in lower electric process The lba being stored in Journal, by its corresponding base data of delta data patch, during preservation, due to that may go out Existing base data fail to be saved in flash, but delta data corresponding thereto have been saved in flash, now, then may be used To utilize the lba being stored in Journal, delta data corresponding with the base data lost are found, and will be newest Delta data patch is to its corresponding base Data Positions, so as to ensure the integrality of base data.

It is understood that because data storage location changes, it is therefore desirable to be in advance the good lba of data distribution (Logical Block Address, logical block addresses), lba can utilize base data and the data volume of delta data Proportionate relationship can calculate the lba quantity that every kind of metadata needs in whole ssd, for example, calculating lba scopes such as with 8T disc gages Under:User's LBA range:[0,512M-1], metadata LBA range:[512M, 512M+512K-1], delta data LBA range: [512M+512K,512M+4/3*512K-1]。

It should be noted that metadata can include first numbers such as L2P tables, trim bitmap and super block info According to every kind of metadata has its corresponding delta data, and also all possessing has respective increment DDR buffering areas, Mei Zhongyuan The preservation process of data is all identical with above-mentioned preservation process.

It can be seen that delta data are written to by the embodiment of the present invention by designing delta data come identification metadata increment In the increment DDR buffering areas of its corresponding default size, and when increment DDR buffering areas write full, just by delta data and Base data in the basic DDR buffering areas of its corresponding preset ratio are written in flash, are reduced to read and write SSD and are imitated The influence of rate, JM data storage quantity when also reducing power down.

The embodiment of the invention discloses Journal store methods during a kind of specific SSD operations, implement relative to upper one Example, the present embodiment have made further instruction and optimization to technical scheme.It is shown in Figure 2, specifically:

Step S21:Delta data are written in the local buffer of its corresponding default size.

Specifically, in order to further improve delta writing speeds, first delta data are written to corresponding to its Default size local buffer in, wherein, local buffer can also be ping-pang local buffer, tool Body elta data write-in local buffer process includes step S211 and step S212:

Step S211:Delta data are written in the first local buffer of its corresponding default size.

Step S212:After the first local buffer data volumes are write completely, using ping-pang forms, by delta data It is written in the 2nd local buffer of its corresponding default size, so that delta data are alternately written into the first local In buffer and the 2nd local buffer.

Wherein, local buffer default size can be 256 bytes, naturally it is also possible to be entered according to practical application request The regulation of row size.

Step S22:After local buffer data volumes are write completely, the delta data in local buffer are written to In the increment DDR buffering areas of default size corresponding with local buffer.

It is understood that by the way that first delta data are written in local buffer, then by local buffer Delta data be written to speed in corresponding increment DDR buffering areas, be faster than and delta data be directly written to increment DDR The speed of buffering area, the further speed for improving delta data write-in flash, Journal preserves effect when improving SSD operations Rate.

Step S23:When increment DDR buffer area data volumes are write it is full after, by the delta data in increment DDR buffering areas and with Base data in the basic DDR buffering areas of its corresponding preset ratio are written in flash.

Accordingly, the embodiment of the invention also discloses Journal during a kind of SSD operations to preserve system, shown in Figure 3, The system includes:

Cache memory module 11, for delta data corresponding with metadata increment to be written into its corresponding preset In the increment DDR buffering areas of size;

Flash memory modules 12, for after increment DDR buffer area data volumes write full, by increment DDR buffering areas Base data in the basic DDR buffering areas of delta data and its corresponding preset ratio are written in flash.

Wherein, preset ratio is to utilize the rebuild times of metadata, delta data volumes and base numbers after system electrification The ratio being calculated according to amount.

It can be seen that delta data are written to by the embodiment of the present invention by designing delta data come identification metadata increment In the increment DDR buffering areas of its corresponding default size, and when increment DDR buffering areas write full, just by delta data and Base data in the basic DDR buffering areas of its corresponding preset ratio are written in flash, are reduced to read and write SSD and are imitated The influence of rate, JM data storage quantity when also reducing power down.

In the embodiment of the present invention, above-mentioned cache memory module 11, local buffer sub-module storeds, caching can be included Sub-module stored, the first buffer memory unit and the second buffer memory unit;Wherein,

Local buffer sub-module storeds, for delta data to be written to the local of its corresponding default size In buffer;

Buffer memory submodule, for after local buffer data volumes write full, by the delta in local buffer Data are written in the increment DDR buffering areas of default size corresponding with local buffer.

First buffer memory unit, for delta data to be written to the first increment DDR of its corresponding default size In buffering area;

Second buffer memory unit, for after the first increment DDR buffer area data volumes write full, utilizing ping-pang shapes Formula, delta data are written in the second increment DDR buffering areas of its corresponding default size, so that delta data replace Write in the first increment DDR buffering areas and the second increment DDR buffering areas.

Specifically, above-mentioned local buffer sub-module storeds, can include the first local buffer memory cell and First local buffer memory cell;Wherein,

First local buffer memory cell, for delta data to be written into the of its corresponding default size In one local buffer;

2nd local buffer memory cell, for after the first local buffer data volumes write full, utilizing ping- Pang forms, delta data are written in the 2nd local buffer of its corresponding default size, so that delta numbers According to being alternately written into the first local buffer and the 2nd local buffer.

Above-mentioned flash memory modules 12, it can include supplying memory cell;Wherein

Supply memory cell, for when in increment DDR buffering areas delta data be less than the default big of increment DDR buffering areas It is small, then the remaining space in increment DDR buffering areas is filled using dummy data, increment DDR buffer area data volumes are write completely, then Base data in the basic DDR buffering areas of delta data in increment DDR buffering areas and its corresponding preset ratio are write Enter into flash.

The embodiment of the present invention can also include lower electric module;Wherein,

Lower electric module, in lower electric process using the lba being stored in Journal, by delta data patch and its Corresponding base data.

Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged Except other identical element in the process including the key element, method, article or equipment being also present.

Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty Technical staff can realize described function using distinct methods to each specific application, but this realization should not Think beyond the scope of this invention.

Journal store methods and system are described in detail when being run above to a kind of SSD provided by the present invention, Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is simply used Understand the method and its core concept of the present invention in help;Meanwhile for those of ordinary skill in the art, according to the present invention's Thought, there will be changes in specific embodiments and applications, in summary, this specification content should not be construed as Limitation of the present invention.

Claims (10)

  1. A kind of 1. Journal store methods during SSD operations, it is characterised in that including:
    Delta data corresponding with metadata increment are written in the increment DDR buffering areas of its corresponding default size;
    When the increment DDR buffer area data volumes are write it is full after, by the delta data in the increment DDR buffering areas and with its phase Base data in the basic DDR buffering areas for the preset ratio answered are written in flash.
  2. 2. Journal store methods during SSD operations according to claim 1, it is characterised in that the preset ratio is profit With the ratio that the rebuild times of metadata, delta data volumes and base data volumes are calculated after system electrification.
  3. 3. Journal store methods during SSD operations according to claim 1, it is characterised in that also include:
    Using the lba being stored in Journal in lower electric process, by its corresponding base data of delta data patch.
  4. 4. Journal store methods during SSD operations according to claim 1, it is characterised in that described to work as the increment DDR buffer area data volumes write it is full after, by the delta data in the increment DDR buffering areas and its corresponding preset ratio Base data in basic DDR buffering areas are written to the process in flash, including:
    When delta data less than the default size of the increment DDR buffering areas, then utilize dummy in the increment DDR buffering areas Data fill the remaining space in the increment DDR buffering areas, and the increment DDR buffer area data volumes are write completely, then by described in Base data write-in in the basic DDR buffering areas of delta data and its corresponding preset ratio in increment DDR buffering areas Into flash.
  5. 5. Journal store methods during SSD operations according to claim 1, it is characterised in that described to increase with metadata The process that corresponding delta data are written in the increment DDR buffering areas of its corresponding default size is measured, including:
    Delta data are written in the local buffer of its corresponding default size;
    When the local buffer data volumes are write it is full after, the delta data in the local buffer are written to and institute Local buffer are stated to preset in the increment DDR buffering areas of size accordingly.
  6. 6. Journal store methods during SSD operations according to claim 5, it is characterised in that described by delta data The process being written in the local buffer of its corresponding default size, including:
    Delta data are written in the first local buffer of its corresponding default size;
    When the first local buffer data volumes are write it is full after, using ping-pang forms, by delta data be written to In 2nd local buffer of its corresponding default size, so that delta data are alternately written into the first local In buffer and the 2nd local buffer.
  7. Journal store methods when 7. the SSD according to any one of claim 1 to 6 is run, it is characterised in that described to incite somebody to action Delta data corresponding with metadata increment are written to the process in the increment DDR buffering areas of its corresponding default size, bag Include:
    Delta data are written in the first increment DDR buffering areas of its corresponding default size;
    When the first increment DDR buffer area data volumes are write it is full after, using ping-pang forms, by delta data be written to In second increment DDR buffering areas of its corresponding default size, so that delta data are alternately written into the first increment DDR and delayed Rush in area and the second increment DDR buffering areas.
  8. 8. Journal preserves system during a kind of SSD operations, it is characterised in that including:
    Cache memory module, for delta data corresponding with metadata increment to be written into its corresponding default size In increment DDR buffering areas;
    Flash memory modules, for after the increment DDR buffer area data volumes write full, by the increment DDR buffering areas Base data in the basic DDR buffering areas of delta data and its corresponding preset ratio are written in flash.
  9. Journal preserves system when 9. SSD is run according to claim 8, it is characterised in that the cache memory module, Including:
    Local buffer sub-module storeds, for delta data to be written to the local of its corresponding default size In buffer;
    Buffer memory submodule, for after the local buffer data volumes write full, by the local buffer Delta data are written in the increment DDR buffering areas of default size corresponding with the local buffer.
  10. Journal preserves system when 10. SSD is run according to claim 8 or claim 9, it is characterised in that the buffer memory mould Block, including:
    First buffer memory unit, the first increment DDR for delta data to be written to its corresponding default size are buffered Qu Zhong;
    Second buffer memory unit, for after the first increment DDR buffer area data volumes write full, utilizing ping-pang shapes Formula, delta data are written in the second increment DDR buffering areas of its corresponding default size, so that delta data replace Write in the first increment DDR buffering areas and the second increment DDR buffering areas.
CN201710641083.6A 2017-07-31 2017-07-31 Journal store methods and system during a kind of SSD operations CN107422992A (en)

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