CN110196687A - Data read-write method, device, electronic equipment - Google Patents
Data read-write method, device, electronic equipment Download PDFInfo
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- CN110196687A CN110196687A CN201910419198.XA CN201910419198A CN110196687A CN 110196687 A CN110196687 A CN 110196687A CN 201910419198 A CN201910419198 A CN 201910419198A CN 110196687 A CN110196687 A CN 110196687A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/062—Securing storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0629—Configuration or reconfiguration of storage systems
- G06F3/0637—Permissions
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0656—Data buffering arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
Abstract
The application provides a kind of data read-write method, device, electronic equipment and machine readable storage medium.In this application, the read-write requests that the data of memory space are corresponded to for the storage system are received；The first RAID array is selected from several RAID arrays based on preset strategy；It is requested in response to the reading and writing data, all write requests in reading and writing data request is stored in first RAID array.Isolation and equilibrium are carried out in RAID level based on the reading and writing data request to full flash-memory storage system, write request is avoided and pre-reads the medium conflict that IO generates block (block) grade, to improve the data read-write efficiency of storage system.
Description
Technical field
This application involves technical field of memory more particularly to data read-write method, device, electronic equipment and machine readable deposit
Storage media.
Background technique
Hard disk is generally divided into solid state hard disk (Solid State Drive) and mechanical hard disk；Wherein, mechanical hard disk refers to biography
It unites common hard disc, mainly by disc, magnetic head, disc shaft and control motor, magnetic head control device, data converter, interface,
Several part compositions such as caching；It can be moved along the radial direction of disc by magnetic head, in addition disc thousands of turns of high speed per minute
Rotation, magnetic head can be located in the read-write operation that data are carried out on the designated position of disc；Data pass through from magnetic table as a result,
The close magnetic head in face is changed polarity mode by electromagnetic current and write on mechanical disk by electromagnetic current, and data can be by opposite
Mode is read.
And solid state hard disk is divided into two major classes from storage medium angle, one kind is using flash memory (Flash Memory) conduct
The solid state hard disk of storage medium, another kind of is using DRAM (Dynamic Random Access Memory, dynamic randon access
Memory) solid state hard disk as storage medium.Solid state hard disk described in usual people refers to, using flash memory as storage medium
Solid state hard disk.
Since solid state hard disk has faster speed and higher stability compared to mechanical hard disk, so solid state hard disk quilt
It is widely used in military, vehicle-mounted, industry control, video monitoring, network monitoring, the network terminal, electric power, medical treatment, aviation, navigation equipment etc.
Numerous areas.
Summary of the invention
The application provides a kind of data read-write method, and the method is applied to storage system, if the storage system includes
Dry solid-state hard disk, the storage system are preset with several RAID arrays, which comprises
The first RAID array is selected from several RAID arrays based on preset strategy；
Receive the read-write requests that the data of memory space are corresponded to for the storage system；
It is requested in response to the reading and writing data, all write requests in reading and writing data request is stored in described first
RAID array.
Optionally, the storage system further includes pre- read buffer, further includes:
Pre- read operation is executed for the 2nd RAID data for corresponding to memory space, and the data for pre-reading acquisition are stored in
In the pre- read buffer；
In response to the reading and writing data request in for the 2nd RAID correspond to memory space data read request,
Search whether that there are matched datas from the pre- read buffer；If it exists, then the matched data is returned into the read request
Corresponding application.
Optionally, the preset strategy is the RAID Selection Strategy based on poll.
Optionally, several RAID arrays are as constructed by the different subregions for being located at all solid state hard disks.
Optionally, the solid state hard disk is the solid state hard disk for supporting multithread to write.
Optionally, the storage system is full flash-memory storage system, and the storage system is supported described in NVMe consultative management
Solid state hard disk.
The application also provides a kind of data read-write equipment, and described device is applied to storage system, and the storage system includes
Several solid state hard disks, the storage system are preset with several RAID arrays, and described device includes:
Selecting module selects the first RAID array from several RAID arrays based on preset strategy；
Module is obtained, the read-write requests for corresponding to the data of memory space for the storage system are received；
Module for reading and writing is requested in response to the reading and writing data, and all write requests in reading and writing data request are saved
In first RAID array.
Optionally, the storage system further includes pre- read buffer, further includes:
The selecting module is further, selects the 2nd RAID gusts from several RAID arrays based on preset strategy
Column, wherein the 2nd RAID is other RAID arrays in several RAID arrays in addition to first RAID array；
The module for reading and writing is further, executes pre- read operation for the 2nd RAID data for corresponding to memory space, and
The data for pre-reading acquisition are stored in the pre- read buffer；
The module for reading and writing is further, in response to storing in reading and writing data request for the 2nd RAID is corresponding
The read request of the data in space searches whether that there are matched datas from the pre- read buffer；If it exists, then by the coupling number
According to returning to the corresponding application of the read request.
Optionally, the preset strategy is the RAID Selection Strategy based on poll.
Optionally, several RAID arrays are as constructed by the different subregions for being located at all solid state hard disks.
Optionally, the solid state hard disk is the solid state hard disk for supporting multithread to write.
Optionally, the storage system is full flash-memory storage system, and the storage system is supported described in NVMe consultative management
Solid state hard disk.
The application also provides a kind of electronic equipment, including communication interface, processor, memory and bus, and the communication connects
Pass through bus between mouth, the processor and the memory to be connected with each other；
Machine readable instructions are stored in the memory, the processor is executed by calling the machine readable instructions
Above-mentioned method.
The application also provides a kind of machine readable storage medium, and the machine readable storage medium is stored with machine readable finger
It enables, the machine readable instructions realize the above method when being called and being executed by processor.
By above embodiments, based on the reading and writing data request to full flash-memory storage system RAID level carry out isolation and
Equilibrium avoids write request and pre-reads the medium conflict of IO generation block (block) grade, so that the data for improving storage system are read
Write efficiency.
Detailed description of the invention
Fig. 1 is a kind of architecture diagram for full flash-memory storage system that an exemplary embodiment provides；
Fig. 2 is a kind of flow chart for data read-write method that an exemplary embodiment provides；
Fig. 3 is a kind of composition schematic diagram for SSD that an exemplary embodiment provides；
Fig. 4 is a kind of subregion schematic diagram for SSD that an exemplary embodiment provides；
Fig. 5 is a kind of composition schematic diagram for RAID array that an exemplary embodiment provides；
Fig. 6 is provide a kind of LUN volumes of an exemplary embodiment and the correspondence diagram of RAID array；
Fig. 7 is the hardware structure diagram for a kind of electronic equipment that an exemplary embodiment provides；
Fig. 8 is a kind of block diagram for data read-write equipment that an exemplary embodiment provides.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the application.
It is only to be not intended to be limiting the application merely for for the purpose of describing particular embodiments in term used in this application.
It is also intended in the application and the "an" of singular used in the attached claims, " described " and "the" including majority
Form, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein refers to and wraps
It may be combined containing one or more associated any or all of project listed.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example, not departing from
In the case where the application range, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination ".
In order to make those skilled in the art more fully understand the technical solution in the embodiment of the present application, below first to this Shen
Please the relevant technologies of reading and writing data that are related to of embodiment, be briefly described.
In order to facilitate understanding, full flash-memory storage system under introduction.Referring to Figure 1, Fig. 1 is that one embodiment of the application provides
A kind of architecture diagram of full flash-memory storage system.
Full flash-memory storage system as shown in Figure 1 includes: storage control and disk cabinet；Wherein, disk cabinet is for managing muti-piece
SSD (solid state hard disk), storage control are connect by storing bus with disk cabinet, and pass through SAS (Serial Attached
SCSI, serial SCSI) (Non-Volatile Memory express, Nonvolatile memory host controller connect by agreement or NVMe
Mouthful specification) SSD in protocol access disk cabinet；
Wherein, one piece of SSD may include several flash memory particles, and a flash memory particle is usually divided into multiple block
(block)；Wherein, block is the erasable unit of SSD, is made of multiple page (page)；And page is the smallest read-write cell of SSD,
Usually 4KB.
In general, the read-write of SSD can be carried out based on the different unit capacitys of the flash media included by SSD
Read-write, such as: can be based respectively on unit capacity by page, by block (block), by particle, by disk, SSD is written and read.?
It when being written and read to SSD, is written and read to the flash media for the flash memory particle for constituting SSD.Usual flash memory particle is supported
Three kinds of operations, comprising: read, program (namely writing) and wipe.
Covering is supported to write with mechanical hard disk, the characteristic for not needing erasing is different, must before flash media executes write operation
Erasing operation need be executed to it.And the minimum unit for flash media read-write is page, but the minimum unit wiped is
Block (i.e. multiple page).
Since flash media does not support covering to write, in some scenes, need the target page institute in block to be erased
It saves legacy data and copies to other places, then wiping the block, target page write newly so as to continue to execute
Data.Additional " write-in is amplified " phenomenon will be will lead to as a result, namely being actually written into the physical data amount of flash media is plan
More times of data volume are written.
Based on the above scene as it can be seen that concurrent read-write requests may be fallen when being written and read simultaneously to a SSD
It onto the same flash memory particle of SSD, and then falls on the same block, will affect the place of read request so as to cause write request
Reason, causes the delay of read request to increase.Such as: under normal circumstances, the response delay for SSD read request is general all relatively more flat
Surely, the fuctuation within a narrow range such as above or below 0.5ms, but the delay that will appear several read requests once in a while is risen violently to 2ms or even 5ms, it is above
Situation is exactly read-write requests caused by the same block access conflict.
Based on the framework of full flash-memory storage system as shown in Figure 1, the application is directed to one kind, is based on full flash memory storage system
The RAID level of system accesses the reading and writing data technical solution of isolation.
When realizing, the storage system includes several solid state hard disks, and the storage system is preset with several RAID arrays,
The first RAID array is selected from several RAID arrays based on preset strategy；It receives and is deposited for storage system correspondence
Store up the read-write requests of the data in space；It is requested in response to the reading and writing data, all write in reading and writing data request is asked
It asks and is stored in first RAID array.
In above scheme, based on to full flash-memory storage system reading and writing data request RAID level carry out isolation and
Weighing apparatus avoids write request and pre-reads the medium conflict that IO generates block (block) grade, to improve the reading and writing data of storage system
Efficiency.
The application is described below by specific embodiment and in conjunction with specific application scenarios.
Referring to FIG. 2, Fig. 2 is a kind of flow chart for data read-write method that one embodiment of the application provides, the method
Applied to storage system, the storage system includes several solid state hard disks, and the storage system is preset with several RAID arrays, on
It states method and executes following steps:
Step 202 selects the first RAID array from several RAID arrays based on preset strategy.
Step 204 receives the read-write requests that the data of memory space are corresponded to for the storage system.
Step 206 is requested in response to the reading and writing data, and all write requests in reading and writing data request are stored in
First RAID array.
Below by way of specific embodiment, and " RAID creation ", " reading and writing data " are combined, to the technology of the application being related to
Scheme is described in detail:
1) RAID is created
In the present specification, above-mentioned storage system refers to the storage system by containing several solid state hard disks.
When realizing, above-mentioned storage system can also be able to include SAS disk or SATA disk in addition to including solid state hard disk.
In a kind of embodiment shown, above-mentioned storage system is, for example, full flash-memory storage system shown in FIG. 1；Its
In, the hard disk of above-mentioned system management memory is all solid state hard disk, and above-mentioned storage system is supported in NVMe agreement or SAS protocol management
State solid state hard disk.
In the present specification, above-mentioned solid state hard disk may include any solid state hard disk that storage medium is flash memory.It is subsequent
For convenience of description, solid state hard disk is referred to as SSD.
Fig. 3 is referred to, Fig. 3 is a kind of composition schematic diagram for SSD that one embodiment of the application provides.
SSD as shown in Figure 3 includes: control unit, Memory, flash memory particle；Wherein, flash memory particle is deposited for data
Storage is the physical medium for saving data, can be persistently stored data, and one piece of SSD has multiple flash memory particles, and by these particle groups
It knits, better read or write speed is provided；Control unit is the control centre of SSD, is responsible for carrying out at agreement with the access end of SSD
Reason realizes the I/O requests such as read-write to realize the Mapping and Converting of flash media included by external logic address to flash memory particle；
Memory is the caching of SSD, writes IO and map metadata for caching, usually with the ability of power down protection.
In a kind of embodiment shown, further, above-mentioned solid state hard disk can also be the solid-state for supporting multithread to write
Hard disk.In order to facilitate understanding, concept is write in lower multithread described herein.Multithread is write, and refers to and data are divided into according to different update frequency
Multiple data flows, and when write SSD, the controller of SSD identifies these data flows, so that the data flow of same characteristic features is write on
(continuous block in SSD) together.
In the present specification, above-mentioned storage system supports SAS protocol to manage above-mentioned solid state hard disk.
In the another embodiment shown, above-mentioned storage system supports the above-mentioned solid state hard disk of NVMe consultative management.
In the present specification, above-mentioned storage system is based on several above-mentioned solid state hard disks, can create several RAID arrays.
In order to facilitate understanding, lower RAID relating basic concepts are first introduced.RAID technique is by multiple independent physical disks
It combines in different ways, forms a virtual disk.By using RAID technique, concurrent reading and concurrent writing number may be implemented
According to, the access rate of data is improved, meanwhile, RAID technique has used the technologies such as mirror image, even-odd check to carry out redundancy to data
Protection, greatly improves the reliability of data.
One RAID array may include multiple member disks, and the Method of Data Organization in RAID array includes stick and item
Band.Wherein, stick be RAID array management memory space minimum unit, when creating RAID array, including member
The memory space of disk is divided into block equal in magnitude, that address is adjacent by default block size, these are equal in magnitude, address is adjacent
Block be known as stick；Band is the set of the relevant stick in position in multiple member disks of RAID array, according to RAID level
Difference, RAID implementation is different, and the number of member disk is different in RAID array, and member disk state is different and RAID is calculated
Method is different, and the RAID redundancy of data is also different in stick.
In RAID technique, RAID array to the processing of read/write command is handled according to band, works as RAID array
After receiving the read/write command that upper layer software (applications) issues, band to be operated is determined based on the address carried in the read/write command,
Later based on factors such as RAID level, RAID algorithm, member disk states, which is split as in the band
Read/write command after fractionation is issued corresponding member disk by the read/write command of the correspondence stick of one or more member disks
It executes.Subsequent, member disk executes the read/write command received, and implementing result is back to RAID array.
In the present specification, above-mentioned storage system can create RAID array with the whole disk space of multiple solid state hard disks.
In a kind of preferred embodiment shown, above-mentioned storage system can carry out subregion to all solid state hard disks.
Fig. 4 is referred to, Fig. 4 is a kind of subregion schematic diagram for SSD that one embodiment of the application provides.
Fig. 4 is identical as SSD composition shown in Fig. 3, and difference is flash memory particle shown in Fig. 4 (6 squares in respective dashed
Shape lattice) it is divided into 3 subregions (p1, p2, p3 in corresponding diagram 4).
For example, above-mentioned storage system, can execute all solid state hard disks included by above-mentioned storage system as shown in Figure 4
Subregion.
In a kind of embodiment shown, subregion is executed to included all solid state hard disks in above-mentioned storage system
Afterwards, further, above-mentioned storage system can construct RAID array with the different subregions of all solid state hard disks.It should be noted that
Different subregions based on all solid state hard disks construct RAID array, relative to based in existing scheme based on the whole disk of solid state hard disk
RAID array creation is executed, can provide relative scale higher memory space for each RAID array, and can provide faster
Read or write speed.
In order to facilitate understanding, existing RAID array creates scheme under described herein.Such as: above-mentioned storage system has 18 pieces
SSD, existing RAID array creation scheme include: that above-mentioned 6 algorithm of storage system RAID creates 3 RAID arrays, then each RAID
It is made of 6 pieces of SSD.Due to the RAID array created based on RAID6 algorithm, need 2 parts of verification data that redundancy is kept (specifically to ask
Referring to RAID6 algorithmic descriptions), so the RAID array of 6 pieces of SSD composition can only provide the capacity of 4 pieces of SSD, in 6 pieces of SSD
The capacity of other 2 pieces of SSD is used to calculate verification data.Scheme is created based on the above existing RAID array, it is seen that above-mentioned 3 RAID
The data capacity that can finally provide is equal to the capacity of 12 pieces of SSD；Meanwhile the read or write speed of each RAID, do not exceed 6 pieces of SSD
Summation.
Fig. 5 is referred to, Fig. 5 is a kind of composition schematic diagram for RAID array that one embodiment of the application provides.As shown in Figure 5
RAID array composition schematic diagram, (respectively correspond 4 solid line squares at the top of Fig. 5 including multiple 4 SSD similar to Figure 4
Shape frame)；Wherein, each SSD is carried out subregion similar to Figure 4 (wherein, each SSD includes 3 subregions, the 1st SSD's
P1, p2, p3 in subregion corresponding diagram 5；Q1, q2, q3 in the subregion corresponding diagram 5 of 2nd SSD；The subregion of 3rd SSD is corresponding
M1, m2, m3 in Fig. 5；N1, n2, n3 in the block plan 5 of 4th SSD).
As shown in figure 5, above-mentioned storage system with the subregion of the 1st SSD, the subregion of the 2nd SSD, the 3rd SSD subregion,
The subregion of 4th SSD, as " member disk " (referring to the introduction in above " RAID concept ") of creation RAID-A, creation is such as
RAID array shown in fig. 5；Wherein, it includes: RAID-A, RAID-B, RAID- that above-mentioned storage system, which creates 3 RAID arrays,
C。
The corresponding relationship of RAID array and subregion as shown in Figure 5 refers to as shown in Figure 5 from above-mentioned 3 RAID gusts
Corresponding dotted line is arranged to embody.
Such as: shown in Figure 5, RAID-A is by above-mentioned storage system with the subregion p1 of the 1st SSD, the 2nd SSD
The subregion m1 composition of subregion q1, the subregion m1 of the 3rd SSD, the 4th SSD；RAID-B is by above-mentioned storage system with the 1st SSD's
The subregion n2 composition of subregion p2, the subregion q2 of the 2nd SSD, the subregion m2 of the 3rd SSD, the 4th SSD.RAID-C is deposited by above-mentioned
Storage system is with the subregion n3 group of the subregion p3 of the 1st SSD, the subregion q3 of the 2nd SSD, the subregion m3 of the 3rd SSD, the 4th SSD
At.It should be noted that above-mentioned storage system can construct any RAID type with the different subregions of above-mentioned solid state hard disk
RAID array corresponds to RAID type to above-mentioned RAID array in the present specification and is not especially limited.
It should be noted that since the subregion that different above-mentioned RAID arrays are included is different, when concurrent reading and writing request is fallen in
When on different subregions, concurrent reading and writing request would not hit the same block, to improve above-mentioned storage system to simultaneously
It is handled while sending out read-write requests.Such as: 3 read-write requests shown in Figure 5 (respectively correspond Stream1 in Fig. 5,
Stream2, Stream3) in the flash memory particle of the 1st SSD in respectively correspond access subregion be p1, p2 as shown in Figure 5,
P3, namely the same block will not be hit.
2) reading and writing data
In the present specification, after above-mentioned storage system has created several above-mentioned RAID arrays, above-mentioned RAID can be based on
Array further creates LUN (Logical Unit Number, logical unit number) volume, provides storage service for user；Wherein,
LUN volumes, refer within the storage system, for the application program that user uses, the object for data storage provided；That is, LUN
Volume is the accessible object that user's (application program) that storage system is storage system provides.
In the present specification, after above-mentioned storage system receives the read-write requests from application program, above-mentioned storage system
Different processing can be carried out for the read-write requests.
When realizing, if after receiving the write request from application program, above-mentioned storage system is found and the write request pair
LUN volumes answered distributes memory space in the correspondence RAID array being located at this LUN volumes, and the data for including by the write request are written
To the memory space；Above-mentioned storage system is based on the corresponding RAID algorithm of the RAID array and executes calculating and conversion to the data,
Data after calculating and conversion are written in SSD or SSD subregion included by the RAID array；Then, this LUN volumes is updated
Metadata, wherein metadata (is asked in the mapping relations for recording LUN volumes of counterlogic space to the RAID array memory space
Referring to the existing metadata explanation in storage system, which is not described herein again)；Finally, returning to the write request to the application program
Response.
In the present specification, if after receiving the read request from application program, above-mentioned storage system is found asks with the reading
Ask corresponding LUN volumes；Then, according to LUN volumes of the metadata, the read request logical space is found to this LUN volumes corresponding RAID
The mapping relations of array memory space；It is based on the mapping relations again, the corresponding RAID algorithm of the RAID array is based on, from the RAID
Array, which corresponds to, reads corresponding data in memory space；Finally, returning to the response of the read request to the application program and corresponding to
Read data.
Fig. 6 is referred to, Fig. 6 is that a kind of LUN volumes of the offer of one embodiment of the application and the corresponding relationship of RAID array are illustrated
Figure.Above-mentioned LUN volumes with the corresponding relationship of above-mentioned RAID array, for example, shown in Fig. 6, there are 3 on RAID-A (RAID array)
LUN volumes (LUN-1, LUN-2, LUN-3 in corresponding for example Fig. 6).Above-mentioned storage system receives multiple readings from application program
Write request, as shown in Figure 6, it is understood that there may be the write request of a data A that be written LUN-1；Being also likely to be present one will be written
The write request of the data B of LUN-2；Being also possible to exist simultaneously the write request for the data C that one will be written LUN-3 and one will be from
The read request of LUN-3 reading data D.It should be noted that above-mentioned multiple read-write requests can be sequence, and can be simultaneously
Hair.
In the present specification, before receiving the above-mentioned read-write requests from application program, above-mentioned storage system is from above-mentioned
The first RAID array is selected in several RAID arrays.
When realizing, above-mentioned storage system can traverse above-mentioned several RAID arrays and therefrom select the above-mentioned first RAID gusts
Column.
In a kind of embodiment shown, above-mentioned storage system can also be based on preset strategy from above-mentioned RAID gusts several
Above-mentioned first RAID array is selected in column；Wherein, above-mentioned preset strategy is the RAID Selection Strategy based on poll.
When realizing, the RAID Selection Strategy of above-mentioned poll refers in preset period of time T, and constantly inquiry obtains
Several RAID arrays of above-mentioned storage system choose a RAID array, as above-mentioned first in above-mentioned several RAID arrays
RAID array；And other RAID arrays in addition to first RAID array are as above-mentioned second RAID array namely above-mentioned second
RAID array may include multiple RAID arrays.It is chosen in addition in subsequent time period T, then from above-mentioned several RAID arrays
One RAID array (different from the first RAID array in previous time period T), as above-mentioned first RAID array, and removing should
Other RAID arrays outside first RAID array are as above-mentioned second RAID array.Thus it similar to the above process, realizes above-mentioned
RAID array is chosen in several RAID arrays in turn as above-mentioned first RAID array, and it is other outside first RAID array
RAID array is above-mentioned second RAID array.
Such as: based on above-mentioned storage system as described in Figure 5, there are 3 RAID arrays: RAID-A, RAID-B, RAID-
C.In the 1st period of time T, above-mentioned storage system selects RAID-A as above-mentioned first RAID array；In the 2nd week time
In phase T, above-mentioned storage system selects RAID-B as above-mentioned first RAID array；In the 3rd period of time T, above-mentioned storage
Systematic selection RAID-C is as above-mentioned first RAID array.
In the present specification, above-mentioned first RAID is being selected from above-mentioned several RAID arrays based on above-mentioned preset strategy
After array, above-mentioned storage system receives the read-write requests that the data of memory space are corresponded to for above-mentioned storage system.
Wherein, above-mentioned read-write requests refer to that application program is located on above-mentioned several RAID arrays above-mentioned storage system
Several LUN volumes of one or more read-write requests.It should be noted that the read-write requests may access different RAID arrays pair
Different LUN volumes answered, there may be concurrent for the read-write requests.
In the present specification, above-mentioned storage system is requested in response to above-mentioned reading and writing data, will be in the request of above-mentioned reading and writing data
All write requests be stored in above-mentioned first RAID array.
Such as: based on above-mentioned storage system as described in Figure 5, there are 3 RAID arrays: RAID-A, RAID-B, RAID-
C, in current time (in 1 period of time T of for example, above-mentioned preset strategy), above-mentioned first RAID array is RAID-A.It answers
All there are read-write requests to LUN volumes on RAID-A, RAID-B, RAID-C with program, above-mentioned storage system reads above-mentioned data
All write requests in write request are stored on RAID-A.
It should be noted that (referring in " reading and writing data " that " above-mentioned storage system is received from answering based on existing realize
After the read-write requests of program, above-mentioned storage system can carry out different processing for the read-write requests " corresponding explanation),
The memory space for being stored in corresponding different RAID array distribution is required to LUN volumes of write request for being located at different RAID arrays
In, rather than save a RAID array.And above-mentioned storage system is requested in response to above-mentioned reading and writing data, by above-mentioned reading and writing data
All write requests in request are stored in above-mentioned first RAID array, so as to realize in same period, all write requests
The same RAID can all be fallen in.
In a kind of embodiment shown, preset strategy is based on from several RAID arrays in above-mentioned storage system
Select above-mentioned second RAID array, wherein above-mentioned 2nd RAID is in above-mentioned several RAID arrays except the above-mentioned first RAID gusts
Other RAID arrays outside column.
Such as: based on above-mentioned storage system as described in Figure 5, there are 3 RAID arrays: RAID-A, RAID-B, RAID-
C.In the 1st period of time T, above-mentioned storage system selects RAID-A as above-mentioned first RAID array, in addition to RAID-A
RAID-B, RAID-C array as above-mentioned second RAID array；In the 2nd period of time T, above-mentioned storage system selection
RAID-B is as above-mentioned first RAID array, and RAID-A, RAID-C array in addition to RAID-B is as the above-mentioned 2nd RAID gusts
Column；In the 3rd period of time T, above-mentioned storage system selects RAID-C as above-mentioned first RAID array, in addition to RAID-C
RAID-A, RAID-B array as above-mentioned second RAID array.
In the present specification, further, after selecting above-mentioned second RAID array, above-mentioned storage system is for above-mentioned
The data that 2nd RAID corresponds to memory space execute pre- read operation, and the data for pre-reading acquisition are stored in above-mentioned pre- read buffer；
Wherein, above-mentioned pre- read buffer can be not specifically limited in the present specification based on memory or other caching hardware realizations.
In the present specification, further, behaviour is pre-read in the data execution for corresponding to memory space for above-mentioned 2nd RAID
After work, above-mentioned storage system is in response to the data for corresponding to memory space for above-mentioned 2nd RAID in the request of above-mentioned reading and writing data
Read request, search whether that there are matched datas from above-mentioned pre- read buffer；If it exists, then above-mentioned matched data is returned to
State the corresponding application of read request.
Based on above-mentioned storage system as described in Figure 5, there are 3 RAID arrays: RAID-A, RAID-B, RAID-C are working as
Preceding moment (in 1 period of time T of for example, above-mentioned preset strategy), above-mentioned first RAID array be RAID-A, above-mentioned second
RAID array is RAID-B, RAID-C.Application program all asks LUN volumes on RAID-A, RAID-B, RAID-C in the presence of read-write
It asks,
Above-mentioned storage system pre-reads RAID-B, RAID-C (above-mentioned 2nd RAID) execution and is stored in pre-reads data
Pre- read buffer is stated, above-mentioned storage system is in response to being directed to RAID-B, RAID-C (above-mentioned second in the request of above-mentioned reading and writing data
RAID) the read request of the data of corresponding memory space, searches whether that there are matched datas in above-mentioned pre- read buffer；If it exists,
Above-mentioned matched data is then returned into the corresponding application program of above-mentioned read request (or abbreviation " application ").
It should be noted that being requested in above-mentioned storage system in response to above-mentioned reading and writing data, above-mentioned reading and writing data is requested
In all write requests while be stored in above-mentioned first RAID array, the data of memory space are corresponded to for above-mentioned 2nd RAID
Executing the corresponding RAID array of pre- read operation is above-mentioned second RAID array, all to write so as to realize in the same period
Request can all fall in the same RAID (above-mentioned first RAID), and all IO that pre-read fully fall in other RAID (above-mentioned the
Two RAID) on, in this way, avoiding write request and pre-reading the medium conflict that IO generates block rank, both do not have to worry write request resistance
Plug is pre-read, and pre-reads obstruction write request without worry.
In a kind of preferred embodiment shown, above-mentioned storage system can be with the above-mentioned pre- read buffer of further expansion
Capacity, promotion pre-read hit rate.
It should be noted that above-mentioned storage system is based on above-mentioned preset strategy, (RAID for example, based on poll chooses plan
Slightly), it can balancedly realize write request and pre-read IO and fall in each RAID array in above-mentioned several RAID arrays.
In above technical scheme, request to be isolated in RAID level based on the reading and writing data to full flash-memory storage system
And it is balanced, it avoids write request and pre-reads the medium conflict that IO generates block (block) grade, to improve the data of storage system
Read-write efficiency.
Corresponding with above method embodiment, present invention also provides the embodiments of data read-write equipment.
Corresponding with above method embodiment, this specification additionally provides a kind of embodiment of data read-write equipment.This theory
The embodiment of the data read-write equipment of bright book can be using on an electronic device.Installation practice can by software realization,
It can be realized by way of hardware or software and hardware combining.Taking software implementation as an example, as the device on a logical meaning,
It is that computer program instructions corresponding in nonvolatile memory are read by memory by the processor of electronic equipment where it
What middle operation was formed.For hardware view, as shown in fig. 7, for electronic equipment where the data read-write equipment of this specification
A kind of hardware structure diagram is implemented other than processor shown in Fig. 7, memory, network interface and nonvolatile memory
Electronic equipment in example where device can also include other hardware, not to this generally according to the actual functional capability of the electronic equipment
It repeats again.
Fig. 8 is the block diagram that this specification one implements a kind of data read-write equipment exemplified.
Referring to FIG. 8, the data read-write equipment 80 can be applied in aforementioned electronic equipment shown in Fig. 7, the dress
It sets and is applied to storage equipment, the storage system includes several solid state hard disks, and the storage system is preset with several RAID arrays,
Described device includes:
Selecting module 801 selects the first RAID array from several RAID arrays based on preset strategy；
Module 802 is obtained, the read-write requests for corresponding to the data of memory space for the storage system are received；
Module for reading and writing 803 is requested in response to the reading and writing data, and all write requests in reading and writing data request are protected
There are first RAID arrays.
In the present embodiment, the storage system further includes pre- read buffer, further includes:
The selecting module 801 further, selects the 2nd RAID from several RAID arrays based on preset strategy
Array, wherein the 2nd RAID is other RAID arrays in several RAID arrays in addition to first RAID array；
The module for reading and writing 803 further, for the 2nd RAID data for corresponding to memory space executes pre- read operation,
And the data for pre-reading acquisition are stored in the pre- read buffer；
The module for reading and writing 803 further, is corresponded in response to the 2nd RAID that is directed in reading and writing data request
The read request of the data of memory space searches whether that there are matched datas from the pre- read buffer；It if it exists, then will be described
The corresponding application of the read request is returned to data.
In the present embodiment, the preset strategy is the RAID Selection Strategy based on poll.
In the present embodiment, several RAID arrays are as constructed by the different subregions for being located at all solid state hard disks.
In the present embodiment, the solid state hard disk is the solid state hard disk for supporting multithread to write.
In the present embodiment, the storage system is full flash-memory storage system, and the storage system supports NVMe agreement pipe
Manage the solid state hard disk.
For device embodiment, since it corresponds essentially to embodiment of the method, so related place is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The module of explanation may or may not be physically separated, and the component shown as module can be or can also be with
It is not physical module, it can it is in one place, or may be distributed on multiple network modules.It can be according to actual
The purpose for needing to select some or all of the modules therein to realize application scheme.Those of ordinary skill in the art are not paying
Out in the case where creative work, it can understand and implement.
Device, device, module or the module that above-described embodiment illustrates can specifically realize by computer chip or entity,
Or it is realized by the product with certain function.A kind of typically to realize that equipment is computer, the concrete form of computer can
To be personal computer, laptop computer, cellular phone, camera phone, smart phone, personal digital assistant, media play
In device, navigation equipment, E-mail receiver/send equipment, game console, tablet computer, wearable device or these equipment
The combination of any several equipment.
Corresponding with above method embodiment, this specification additionally provides the embodiment of a kind of electronic equipment.The electronics
Equipment can be applied to storage equipment, and the storage system includes several solid state hard disks, and the storage system is preset with several
RAID array；The electronic equipment includes: processor and the memory for storing machine-executable instruction；Wherein, processor
It is usually connected with each other by internal bus with memory.In other possible implementations, the equipment is also possible that outer
Portion's interface, can be communicated with other equipment or component.
It in the present embodiment, can by reading and executing the machine corresponding with reading and writing data logic of the memory storage
It executes instruction, the processor is prompted to:
The first RAID array is selected from several RAID arrays based on preset strategy；
Receive the read-write requests that the data of memory space are corresponded to for the storage system；
It is requested in response to the reading and writing data, all write requests in reading and writing data request is stored in described first
RAID array.
In the present embodiment, the storage system further includes pre- read buffer, is stored by reading and executing the memory
Machine-executable instruction corresponding with reading and writing data logic, the processor is prompted to:
The second RAID array is selected from several RAID arrays based on preset strategy, wherein the 2nd RAID
For other RAID arrays in several RAID arrays in addition to first RAID array；
Pre- read operation is executed for the 2nd RAID data for corresponding to memory space, and the data for pre-reading acquisition are stored in
In the pre- read buffer；
In response to the reading and writing data request in for the 2nd RAID correspond to memory space data read request,
Search whether that there are matched datas from the pre- read buffer；If it exists, then the matched data is returned into the read request
Corresponding application.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to this specification
Other embodiments.This specification is intended to cover any variations, uses, or adaptations of this specification, these modifications,
Purposes or adaptive change follow the general principle of this specification and undocumented in the art including this specification
Common knowledge or conventional techniques.The description and examples are only to be considered as illustrative, the true scope of this specification and
Spirit is indicated by the following claims.
It should be understood that this specification is not limited to the precise structure that has been described above and shown in the drawings,
And various modifications and changes may be made without departing from the scope thereof.The range of this specification is only limited by the attached claims
System.
The foregoing is merely the preferred embodiments of this specification, all in this explanation not to limit this specification
Within the spirit and principle of book, any modification, equivalent substitution, improvement and etc. done should be included in the model of this specification protection
Within enclosing.
Claims (14)
1. a kind of data read-write method, which is characterized in that the method is applied to storage system, and the storage system includes several
Solid state hard disk, the storage system are preset with several RAID arrays, which comprises
The first RAID array is selected from several RAID arrays based on preset strategy；
Receive the read-write requests that the data of memory space are corresponded to for the storage system；
It is requested in response to the reading and writing data, all write requests in reading and writing data request is stored in the first RAID
Array.
2. the method according to claim 1, wherein the storage system further includes pre- read buffer, further includes:
The second RAID array is selected from several RAID arrays based on preset strategy, wherein the 2nd RAID is institute
State other RAID arrays in several RAID arrays in addition to first RAID array；
Pre- read operation is executed for the 2nd RAID data for corresponding to memory space, and the data for pre-reading acquisition are stored in described
In pre- read buffer；
In response to the read request of the data for corresponding to memory space for the 2nd RAID in reading and writing data request, from institute
It states in pre- read buffer and searches whether that there are matched datas；If it exists, then the matched data read request is returned to correspond to
Application.
3. according to the method described in claim 1, the preset strategy is the RAID Selection Strategy based on poll.
4. the method according to claim 1, wherein several RAID arrays are by being located at all solid state hard disks
Constructed by different subregions.
5. the method according to claim 1, wherein the solid state hard disk is the solid state hard disk for supporting multithread to write.
6. the method according to claim 1, wherein the storage system be full flash-memory storage system, it is described to deposit
Storage system supports solid state hard disk described in NVMe consultative management.
7. a kind of data read-write equipment, which is characterized in that described device is applied to storage system, and the storage system includes several
Solid state hard disk, the storage system are preset with several RAID arrays, and described device includes:
Selecting module selects the first RAID array from several RAID arrays based on preset strategy；
Module is obtained, the read-write requests for corresponding to the data of memory space for the storage system are received；
Module for reading and writing is requested in response to the reading and writing data, and all write requests in reading and writing data request are stored in institute
State the first RAID array.
8. device according to claim 7, which is characterized in that the storage system further includes pre- read buffer, further includes:
The selecting module is further, selects the second RAID array from several RAID arrays based on preset strategy,
In, the 2nd RAID is other RAID arrays in several RAID arrays in addition to first RAID array；
The module for reading and writing is further, executes pre- read operation for the 2nd RAID data for corresponding to memory space, and will be pre-
The data for reading to obtain are stored in the pre- read buffer；
The module for reading and writing is further, in response to corresponding to memory space for the 2nd RAID in reading and writing data request
Data read request, search whether that there are matched datas from the pre- read buffer；If it exists, then the matched data is returned
Back to the corresponding application of the read request.
9. device according to claim 7, the preset strategy is the RAID Selection Strategy based on poll.
10. device according to claim 7, which is characterized in that several RAID arrays are by being located at all solid state hard disks
Different subregions constructed by.
11. device according to claim 7, which is characterized in that the solid state hard disk is the solid state hard disk for supporting multithread to write.
12. device according to claim 7, which is characterized in that the storage system is full flash-memory storage system, described to deposit
Storage system supports solid state hard disk described in NVMe consultative management.
13. a kind of electronic equipment, which is characterized in that including communication interface, processor, memory and bus, the communication interface,
It is connected with each other between the processor and the memory by bus；
Machine readable instructions are stored in the memory, the processor is executed by calling the machine readable instructions as weighed
Benefit requires 1 to 6 described in any item methods.
14. a kind of machine readable storage medium, which is characterized in that the machine readable storage medium is stored with machine readable finger
It enables, the machine readable instructions realize method as claimed in any one of claims 1 to 6 when being called and being executed by processor.
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