CN106933496B - Manage the method and device of RAID - Google Patents
Manage the method and device of RAID Download PDFInfo
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- CN106933496B CN106933496B CN201511027145.1A CN201511027145A CN106933496B CN 106933496 B CN106933496 B CN 106933496B CN 201511027145 A CN201511027145 A CN 201511027145A CN 106933496 B CN106933496 B CN 106933496B
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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
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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
- G06F3/0608—Saving storage space on storage systems
-
- 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
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
Abstract
The invention discloses a kind of methods for managing RAID, belong to storage control field.The method is applied in the storage system for including at least two hard disk groups and controller, hard disk included by each hard disk groups is having the same, is used to indicate the volume type parameter of capacity, this method comprises: receiving the RAID including the greatest member's disk number needed of the RAID at least two hard disk groups manages instruction；When the quantity of the hard disk included by the first hard disk groups is unsatisfactory for greatest member's disk number, the determining volume type parameter with immediate second hard disk groups of volume type parameter of first hard disk groups；The volume type parameter of first hard disk groups is revised as to the volume type parameter of second hard disk groups；RAID management is carried out according to modified volume type parameter, does not need to modify the capacity of each larger capacity hard disk according to hard-disk capacity the smallest in storage system, to achieve the effect that reduce waste of capacity.
Description
Technical field
The present embodiments relate to storage control field, in particular to a kind of method and device for managing RAID.
Background technique
Raid-array (English: Redundant Arrays of Independent Disks, abbreviation:
RAID) be it is a kind of the independent hard disk of muti-piece is differently combined to form into a logic hard disk, to provide than single
The technology of the higher storage performance of hard disk.
In current RAID storage system, deposited for the ease of capacity management when the muti-piece hard disk comprising different capabilities
The capacity of each larger capacity hard disk is revised as the corresponding capacity of minimum capacity hard disk in the storage system first by storage system,
When calculating storage system capacity, for each piece of hard disk, total active volume is calculated according to modified capacity.
During realizing the embodiment of the present invention, the inventor finds that the existing technology has at least the following problems:
The capacity of each larger capacity hard disk is repaired according to hard-disk capacity the smallest in storage system in the prior art
The hard-disk capacity of the processing mode waste changed is more, causes the volume space utilization rate of storage system lower.
Summary of the invention
In order to solve in the prior art to hold the capacity of each larger capacity hard disk according to hard disk the smallest in storage system
The hard-disk capacity for measuring the processing mode waste modified is more, causes the volume space utilization rate of storage system is lower to ask
Topic, the embodiment of the invention provides a kind of method and devices for managing RAID.The technical solution is as follows:
In a first aspect, this method is applied within the storage system the embodiment of the invention provides a kind of method for managing RAID,
The storage system includes at least two hard disk groups and controller, hard disk appearance having the same included by each hard disk groups
Type parameter is measured, the volume type parameter is used to indicate the capacity of the hard disk；The method is executed by controller, comprising:
RAID management instruction is received, the management instruction includes greatest member's disk that the RAID at least two hard disk groups needs
Number；Judge whether the quantity for the hard disk that each hard disk groups are included meets greatest member's disk number；When the first hard disk groups
When the quantity of included hard disk is unsatisfactory for greatest member's disk number, the determining volume type parameter with first hard disk groups
The volume type parameter of the volume type parameter of immediate second hard disk groups, second hard disk groups is less than first hard disk
The volume type parameter of group；The volume type parameter of first hard disk groups is revised as to the volume type of second hard disk groups
Parameter；According to the modified volume type parameter, RAID management, the RAID are carried out at least two hard disk groups
Management includes: to create RAID, delete the hard disk areas of RAID or creation comprising at least two hard disk groups.
The method of management RAID provided in an embodiment of the present invention, the quantity of the hard disk included by the first hard disk groups are unsatisfactory for
When greatest member's disk number that RAID at least two hard disk groups needs, by the volume type parameter of the first hard disk groups be revised as with
The volume type parameter of immediate second hard disk groups of the volume type parameter of first hard disk groups, the capacity class of second hard disk groups
Volume type parameter of the shape parameter less than the first hard disk groups；And according to the modified volume type parameter, it is described at least
RAID management is carried out in two hard disk groups, when the capacity to each larger capacity hard disk is modified, as long as making storage system
In the hard disk number of each hard disk groups meet greatest member's disk number required for the RAID in storage system, do not need by
The capacity of each larger capacity hard disk is modified according to hard-disk capacity the smallest in storage system, reduces capacity wave to reach
The effect taken.
With reference to first aspect, in the first implementation of first aspect, when RAID management instruction is used to indicate
When creating RAID, greatest member's disk number that the RAID at least two hard disk groups needs are as follows: RAID to be created includes
Member disk number；Alternatively, member disk number and the larger value of preset disk number threshold value between the two that RAID to be created includes.It is creating
When building RAID, dynamic adjustment is carried out according to capacity of the member disk number of RAID to be created to each hard disk groups, avoids capacity unrestrained
Take.
With reference to first aspect, in second of implementation of first aspect, when RAID management instruction is used to indicate
When deleting RAID, greatest member's disk number of the RAID needs at least two hard disk groups are as follows: delete RAID to be deleted
Afterwards, at least two hard disk groups corresponding member disk number of remaining RAID maximum value；Alternatively, RAID to be deleted is deleted
After removing, both the maximum value and preset disk number threshold value of the corresponding member disk number of remaining RAID at least two hard disk groups
Between the larger value.When deleting RAID, according to the maximum value of the member disk number of remaining RAID to the capacity of each hard disk groups
Dynamic adjustment is carried out, waste of capacity is avoided.
With reference to first aspect, in the third implementation of first aspect, when RAID management instruction is used to indicate
When creation includes the hard disk areas of at least two hard disk groups, the most great achievement of the RAID needs at least two hard disk groups
Member's disk number is preset disk number threshold value.At the beginning of hard disk areas is established, by pre-set disk number threshold value to each hard disk groups
Capacity carry out just successive step so that create member disk number be less than the pre-set disk number threshold value RAID when, do not need
It modifies to the capacity of each hard disk groups, reduces the number of capacity modification, reduce system complexity.
Any one implementation with reference to first aspect or in the first to three kind of implementation of first aspect,
In 4th kind of implementation of first aspect, whether meet the maximum in the quantity for judging hard disk that each hard disk groups are included
Before member disk number, further includes: whether the group number m of detection at least two hard disk groups is greater than preset group of number threshold value n, m and n
For positive integer；When m is greater than n, determine at least two hard disk groups, the big third hard disk groups of volume type parameter n-th；It will
In at least two hard disk groups, the volume type parameter of the maximum m-n hard disk groups of volume type parameter is revised as described
The capacity parameter of three hard disk groups.The maximum hard disk groups number supported is set for storage system, simplifies computational complexity.
Second aspect, the embodiment of the invention provides a kind of controller, the controller includes at least one unit, this is extremely
A few unit manages for realizing provided by any one possible implementation in above-mentioned first aspect or first aspect
The method of RAID.
The third aspect, the embodiment of the invention provides a kind of storage systems, and the system comprises for realizing above-mentioned first
The controller of the method for management RAID provided by the possible implementation of any one in aspect or first aspect.
Fourth aspect, the embodiment of the invention also provides a kind of computer-readable medium, the computer-readable medium storages
Have for realizing the method for managing RAID provided by the possible implementation of any one in first aspect or first aspect
Instruction.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Figure 1A is the hardware architecture diagram of storage system shown by an illustrative examples of the invention；
Figure 1B is a kind of hard drive space structure chart that illustrative examples shown in figure 1A are related to；
Fig. 1 C is a kind of composition figure for domain space distribution management program that illustrative examples shown in figure 1A are related to；
Fig. 2 is the flow chart of the method for the management RAID that one illustrative examples of the present invention provide；
Fig. 3 A is the flow chart for the volume type parameter amending method that an illustrative examples of the invention provide；
Fig. 3 B is the volume type parameter modification schematic diagram that illustrative examples shown in Fig. 3 A are related to；
Fig. 4 is the block diagram of the device of management RAID provided by one embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Figure 1A is please referred to, it illustrates the hardware structures of storage system shown by an illustrative examples of the invention
Figure.The hardware structure includes following hardware device: redundant array of inexpensive disks 1 10, host 120 and connecting the redundant array of inexpensive disks 1 10 and host
120 controller 130.
It include several hard disks 112 in redundant array of inexpensive disks 1 10.Several hard disks 112 divide at least two hard disk groups, often
The volume type parameter having the same of hard disk included by a hard disk groups, the volume type parameter are used to indicate the capacity of hard disk.
Figure 1B is please referred to, it illustrates a kind of hard drive space structure chart that illustrative examples shown in figure 1A are related to, magnetic
The volume space of each hard disk in disk array 110 and can be divided into Database Managed Space (English according to the type of storage data
Text: Date Base space, abbreviation: DB space), metadata space (English: META space) space, business datum it is empty
Between (English: DATA space) space and write hole space (English: Write Hole).Wherein, DB space is for storing
Class data are configured, which is not that all hard disks are owned by hard disk areas, in a usually storage engines before the 1st frame
4 pieces of hard disks just have this space；META space is used to store business datum for storing metadata, DATA space,
Write Hole is used to store the slitting related data of not complete lower wall.In embodiments of the present invention, form total hard disk areas with
And the hard drive space of each sub- hard disk areas refers to META space and the DATA space in each hard disk, in the present invention after
Continuous modify to the capacity of hard disk just refers to that the capacity to the two spaces in hard disk is modified.
Host 120 is the user management device being connected with controller 130, for example, can be a PC.User
Various management instructions are issued to controller 130 by host 120, for example, creation hard disk areas, creation hard disk groups, deletion hard disk
Group and capacity query etc., the management instruction that controller 130 is issued according to host carry out corresponding management operation.
As shown in 1A, which includes processing unit 132 and interface unit 134.Wherein, interface unit 132 can be with
Including multiple interfaces, a portion interface with host 120 for being communicated, and another part interface is for connecting disk array
110。
Processing unit 132 includes arithmetic and logic unit, register block and control unit etc., be can be in independent
Central processor, or it is also possible to embeded processor, such as microprocessor (English: Micro Processor Unit, contracting
Write: MPU), microcontroller (English: Microcontroller Unit, abbreviation: MCU) or digital signal processor (English:
Embedded Digital Signal Processor, abbreviation: EDSP) etc..
Optionally, controller 130 further includes the components such as memory 136, Cache 138, bus 1310.Wherein: depositing
Reservoir 136 is connected by bus 1310 with processing unit 132 respectively with Cache 138.Cache 138 is for caching
The some intermediate data in data and calculating process read and write with redundant array of inexpensive disks 1 10.
Memory 136 is realized by any kind of volatibility or non-volatile memory device or their combination, such as quiet
State random access memory (English: Static Random Access Memory, referred to as: SRAM), electrically erasable is only
Reading memory (English: Electrically Erasable Programmable Read-Only Memory, referred to as:
EEPROM), Erasable Programmable Read Only Memory EPROM (English: Erasable Programmable Read Only Memory, letter
Claim: EPROM), programmable read only memory (English: Programmable Read-Only Memory, referred to as: PROM), it is read-only
Memory (English: Read Only Memory, abbreviation: ROM), magnetic memory, flash memory, disk or CD.Memory
136 can be used for storing software program and module.
As shown in 1A, memory 136 can application program module needed for storage program area 1362, at least one function
1364.Operating system 1362 can be real time operating system (Real Time eXecutive, RTX), LINUX, UNIX,
The operating system of WINDOWS or OS X etc.Application program module 1364 may include system control module 1364a, volume business
Management module 1364b, caching accelerating module 1364c, disk explain management module 1364d and domain space allocation managing module
1364e.Processing unit 132 can execute system control module 1364a, to realize that user command parses, order issues, Yong Hupei
It sets, the control of Object Management group, system flow, information feedback, event notifies and the functions such as alarm is sent；Alternatively, processing unit 132
Volume service management module 1364b can be executed, to realize that creation, deletion, inquiry and the logic of user volume are rolled onto physical store
The functions such as mapping；Alternatively, processing unit 132 can execute caching accelerating module 1364c, to realize business datum and metadata
Caching and read-write accelerate etc. functions；Alternatively, processing unit 132, which can execute disk, explains management module 1364d, to realize
The functions such as disk identification, positioning, read-write and disk management；Alternatively, domain space distribution management can also be performed in processing unit 132
Module 1364e, with realization, the layout of metadata, space distribution, space reclamation, space management, calculation of capacity, capacity is synchronous, holds
Amount refreshes and the functions such as space maintenance.
In this illustrative examples, storage system supports that creation contains at least two the hard disk areas of hard disk groups, and with
The hard disk areas is whole, creation or deletion RAID at least two hard disk groups that the hard disk areas includes.
In this illustrative examples, the capacity of part larger capacity hard disk can be revised as time great Rong by storage system
Amount, to achieve the effect that reduce waste of capacity.Fig. 1 C is please referred to, it illustrates one that illustrative examples shown in figure 1A are related to
The composition figure of kind of domain space distribution management program, in the scheme shown in this illustrative examples, domain space allocation managing module
1364e may include: command reception module 1364e1, judgment module 1364e2, parameter determination module 1364e3, parameter modification mould
Block 1364e4 and management module 1364e5.
Command reception module 1364e1, for receiving RAID management instruction, the management instruction includes described at least two
Greatest member's disk number that RAID in hard disk groups needs.
Judgment module 1364e2, for judge the quantity of hard disk that each hard disk groups are included whether meet it is described most
Major member's disk number.
Parameter determination module 1364e3, the quantity for working as hard disk included by the first hard disk groups are unsatisfactory for the most great achievement
When member's disk number, the determining volume type parameter with immediate second hard disk groups of volume type parameter of first hard disk groups,
The volume type parameter of second hard disk groups is less than the volume type parameter of first hard disk groups.
Parameter adapting module 1364e4 is hard for the volume type parameter of first hard disk groups to be revised as described second
The volume type parameter of disk group.
Management module 1364e5 is used for according to the modified volume type parameter, at least two hard disk groups
Middle progress RAID management, the RAID management include: creation RAID, delete RAID or create comprising at least two hard disk
The hard disk areas of group.
Optionally, domain space allocation managing module 1364e can also include: that detection module 1364e6 and hard disk groups determine
Module 1364e7.
Detection module 1364e6, for judge in the judging unit hard disk that each hard disk groups are included quantity whether
Before meeting greatest member's disk number, whether the group number m for detecting at least two hard disk groups is greater than preset group of number threshold value
N, m and n are positive integer；
Hard disk groups determining module 1364e7, for determining at least two hard disk groups, volume type when m is greater than n
The big third hard disk groups of parameter n-th；
The parameter adapting module 1364e4 is also used at least two hard disk groups, and volume type parameter is maximum
The volume type parameters of m-n hard disk groups be revised as the capacity parameters of the third hard disk groups.
Referring to FIG. 2, the flow chart of the method for managing RAID provided it illustrates one illustrative examples of the present invention.
The method of management RAID can be used in storage system shown in figure 1A, be executed by controller 130.The side of management RAID
Method may include:
Step 201, RAID management instruction is received, management instruction includes that the RAID at least two hard disk groups needs
Greatest member's disk number.
Wherein, RAID management instruction can be the instruction that user is issued by host, for example, interaction of the user in host
RAID management (creation RAID, the hard disk areas of deletion RAID or creation comprising at least two hard disk groups etc.) is carried out in interface
When operation, host issues RAID management instruction to controller.Alternatively, RAID management instruction is also possible to controller and detects
There is the instruction automatically generated when relevant management operation.
Wherein, management instruction includes that greatest member's disk number that the RAID at least two hard disk groups needs can have
Following several situations:
1) when RAID management instruction, which is used to indicate creation, includes the hard disk areas of at least two hard disk groups, this is at least
Greatest member's disk number that RAID in two hard disk groups needs is preset disk number threshold value.
2) when RAID management instruction is used to indicate creation RAID, the RAID at least two hard disk groups needs most
Major member's disk number are as follows: the member disk number that RAID to be created includes；Alternatively, the RAID to be created member disk number that includes and default
Disk number threshold value the larger value between the two.
In the present example embodiment, a RAID in storage system is by several disk set of blocks (English: Chunk
Group, abbreviation: CKG) composition, each CKG includes n disk block, and the n disk block belongs to n hard disk, and n is exactly this
The member disk number of RAID.Storage system for RAID distribute a disk set of blocks when, by certain stochastic selection algorithm with
Machine selects n hard disk, and takes a disk block respectively from n hard disk being randomly selected to form disk set of blocks.And it stores
When system randomly chooses n hard disk by stochastic selection algorithm, the identical hard disk of residual capacity, selected probability is also identical,
When containing at least two the hard disk groups of corresponding different volume type parameter in storage system, if not in each hard disk groups
Hard disk does any processing, when directly establishing RAID according to the method described above, it may appear that following situations: the hard disk in each hard disk groups
Respective remaining capacity is approximately equal, and respectively remaining capacity is then different for the hard disk in different hard disk groups, when there is part hard disk
The capacity of hard disk is fully assigned away in group, and the total quantity of each hard disk is less than n in other hard disk groups for having residual capacity
When, storage system will show the hard disk groups, and there are also part active volumes, if user issues newly according to the active volume at this time
The instruction of storage pool is built, and it is n that the storage pool, which corresponds to the member disk number of RAID, then storage system will be unable to complete the storage pool
It establishes, storage system is caused to malfunction.As long as analyzing the above problem it can easily be seen that making the quantity of the hard disk in each hard disk groups
The maximum value of member disk number not less than the RAID created within the storage system, it can avoid the above problem.Therefore, originally showing
In example property embodiment, when RAID manages instruction instruction one RAID of creation, RAID can be managed in instruction includes that this is extremely
Greatest member's disk number that RAID in few two hard disk groups needs is set as the member disk number that RAID to be created includes, in this way,
When there is a new RAID to need to create, it is only necessary to so that the hard disk quantity of each hard disk groups be not less than it is to be created
The hard disk number of RAID, it can guarantee that the RAID can be successfully established.
In the present example embodiment, storage system creates the hard disk areas comprising at least two hard disk groups first, so
It is afterwards whole, creation or deletion RAID in the hard disk areas with the hard disk areas.In practical applications, in hard disk areas
In each RAID established, the member disk number of most RAID is all concentrated in some section, only least a portion of RAID's
Member disk number exceeds the section, therefore, in order to avoid the capacity of the hard disk in subsequent frequent modification hard disk groups, builds in hard disk areas
At the beginning of vertical, just successive step can be carried out by capacity of the pre-set disk number threshold value to each hard disk groups so that creation at
It when member's disk number is less than the RAID of the pre-set disk number threshold value, does not need to modify to the capacity of each hard disk groups, reduce
The number of capacity modification, reduces system operations complexity.Wherein, the disk number threshold value can according to most of RAID of prediction at
Section locating for member's disk number is arranged.For example, current RAID points are typical case RAID and atypia RAID, wherein typical RAID
Greatest member's disk number of support is 10, and greatest member's disk number that atypia RAID is supported can be much larger than 10, and user is in storage
The RAID established in system is mostly typical RAID, is only partially atypia RAID, therefore, can be by the pre-set disk
Number threshold value is set as 10.Correspondingly, RAID can be managed in instruction and be wrapped when RAID manages instruction instruction one RAID of creation
Contain, greatest member's disk number that the RAID at least two hard disk groups needs is set as the member disk that RAID to be created includes
The several and the larger value of preset disk number threshold value between the two.
3) when RAID management instruction, which is used to indicate, deletes RAID, the RAID at least two hard disk groups needs most
Major member's disk number are as follows: after RAID to be deleted is deleted, the corresponding member disk number of remaining RAID at least two hard disk groups
Maximum value；Alternatively, after RAID to be deleted is deleted, the corresponding member disk number of remaining RAID at least two hard disk groups
Maximum value and the larger value of preset disk number threshold value between the two.
When deleting a RAID within the storage system, and the RAID is the RAID that member disk number is most in storage system
When, in order to reduce waste of capacity, the capacity of the hard disk at least two hard disk groups of storage system can be readjusted,
It therefore, in the present example embodiment, can be at least two hard by this when RAID management instruction, which is used to indicate, deletes RAID
Greatest member's disk number that RAID in disk group needs is set as deleting the maximum of the corresponding member disk number of remaining RAID after RAID
Value, alternatively, the problem of considering above-mentioned pre-set disk number threshold value, the RAID at least two hard disk groups can also be needed
The greatest member's disk number wanted is set as deleting the maximum value of the corresponding member disk number of remaining RAID and preset disk number after RAID
The larger value of threshold value between the two.
Wherein, which can be executed instruction by the processing unit 132 of controller 130 in storage system shown in figure 1A and be connect
Module 1364e1 is received to realize.
Step 202, judge whether the quantity for the hard disk that each hard disk groups are included meets greatest member's disk number.
Optionally, in the present example embodiment, storage system can be from the maximum hard disk groups of capacity type parameter
Start, successively judges whether the quantity for the hard disk that each hard disk groups are included meets greatest member's disk number.
Wherein, which can judge mould by the execution of processing unit 132 of controller 130 in storage system shown in figure 1A
Block 1364e2 is realized.
Step 203, it when the quantity of the hard disk included by the first hard disk groups is unsatisfactory for greatest member's disk number, determines and should
The volume type parameter of immediate second hard disk groups of the volume type parameter of first hard disk groups, the capacity class of second hard disk groups
Shape parameter is less than the volume type parameter of first hard disk groups.
Wherein, which it is true can to execute parameter by the processing unit 132 of controller 130 in storage system shown in figure 1A
Cover half block 1364e3 is realized.
Step 204, the volume type parameter of first hard disk groups is revised as to the volume type parameter of second hard disk groups.
If the quantity of hard disk included by the first hard disk groups meets greatest member's disk number, first hard disk groups are kept
Volume type parameter constant.
Wherein, which can execute parameter by the processing unit 132 of controller 130 in storage system shown in figure 1A and repair
Change module 1364e4 to realize.
Step 205, according to the modified volume type parameter, RAID management is carried out at least two hard disk groups.
Wherein, RAID management includes: to create RAID, delete RAID or create hard comprising at least two hard disk groups
Disk area.
In addition, scheme shown in the present exemplary embodiment, is repaired in the volume type parameter at least two hard disk groups
When changing, modification waste capacity caused by the modification of volume type parameter can also be counted, and calculation of capacity is wasted according to the modification
The active volume of at least two hard disk groups and capacity is used.
Wherein, which can execute management mould by the processing unit 132 of controller 130 in storage system shown in figure 1A
Block 1364e5 is realized.
In conclusion method shown in this illustrative examples, the quantity of the hard disk included by the first hard disk groups is discontented
When greatest member's disk number that the RAID at least two hard disk groups of foot needs, the volume type parameter of the first hard disk groups is revised as
With the volume type parameter of immediate second hard disk groups of volume type parameter of the first hard disk groups, the capacity of second hard disk groups
Volume type parameter of the type parameter less than the first hard disk groups；And according to the modified volume type parameter, this at least two
RAID management is carried out in a hard disk groups, when the capacity to each larger capacity hard disk is modified, as long as making in storage system
The hard disk number of each hard disk groups meets greatest member's disk number required for the RAID in storage system, and not needing will be each
The capacity of a larger capacity hard disk is modified according to hard-disk capacity the smallest in storage system, to reach reduction waste of capacity
Effect.
The hard disk number for judging each hard disk groups is required whenever establishing or deleting a RAID according to above scheme
Amount whether meet demand, if there are many quantity for establishing the hard disk groups of a hard disk areas, every time establish or delete RAID when,
The number for being judged and modifying volume type parameter also can be very much, and system operations complexity is also increase accordingly, and are to reduce
System computational complexity, in this regard, please referring to Fig. 3 A, the volume type parameter provided it illustrates an illustrative examples of the invention is repaired
The flow chart for changing method, before the step 202 that storage system executes in above-mentioned Fig. 2, can also be performed step 211 to step
Volume type parameter amending method shown in rapid 213:
Step 211, detect at least two hard disk groups group number m whether be greater than preset group of number threshold value n, m and n be positive it is whole
Number.
Wherein, which can execute detection mould by the processing unit 132 of controller 130 in storage system shown in figure 1A
Block 1364e6 is realized.
Step 212, it when m is greater than n, determines at least two hard disk groups, the big third hard disk of volume type parameter n-th
Group.
Wherein, which can execute hard disk groups by the processing unit 132 of controller 130 in storage system shown in figure 1A
Determining module 1364e7 is realized.
Step 213, by least two hard disk groups, the volume type of the maximum m-n hard disk groups of volume type parameter
Parameter is revised as the capacity parameter of the third hard disk groups.
In the present exemplary embodiment, one hard disk groups number threshold value n is set for storage system, if the group of at least two hard disk groups
Number m is greater than n, then the volume type parameter of the corresponding maximum several hard disk groups of volume type parameter is modified, so that modification
The hard disk groups number in storage system is no more than n afterwards, to simplify the computational complexity of storage system.
Specifically for example, in conjunction with the volume type parameter amending method in Fig. 2 and Fig. 3 A corresponding embodiment, it is assumed that the hard disk groups
There are 36 pieces of hard disks, be respectively as follows: 10 pieces of 230G hard disks, 6 pieces of 200G hard disks, 11 pieces of 180G hard disks, 4 pieces of 150G hard disks, 3 pieces of 120G are hard
Disk and 2 pieces of 100G hard disks, the capacity kind number that hard disk groups maximum is supported are 5.After storage system receives RAID management instruction, obtain
It must manage in instruction and include, greatest member's disk number that the RAID at least two hard disk groups needs is 11.Fig. 3 B is please referred to,
Show the volume type parameter modification schematic diagram that illustrative examples shown in Fig. 3 A are related to, wherein due in the hard disk groups
Hard disk comprising 6 kinds of different capabilities, then according to above scheme, the 5th kind of capacity is later after needing from small to large to arrange capacity
The capacity of hard disk is revised as the capacity of the 5th kind of hard disk, i.e., the capacity of the hard disk of 10 pieces of 230G is modified as 200G, at this point, 200G
Hard disk become 16 pieces, be not less than 11, then keep the capacity of the hard disk of 200G constant；Continue with a kind of the hard of lower secondary large capacity
Disk, i.e. 180G hard disk, wherein 180G hard disk is 11 pieces, is not less than 11, then keeps 180G hard disk constant；Continue with the hard of 150G
The capacity of the hard disk of 150G less than 11, is then revised as 120G since the hard disk of 150G is 4 pieces by disk, at this point, 120G hard disk is 7
Block continues the capacity of the hard disk of 7 pieces of 120G being revised as 100G still less than 11, and finally, being equivalent to 100G disk is 9 pieces, this
When, the total capacity of the hard disk groups are as follows: 100G*9+180G*11+200G*16=6080G.
Wherein, which can execute parameter by the processing unit 132 of controller 130 in storage system shown in figure 1A and repair
Change module 1364e4 to realize.
In conclusion method shown in this illustrative examples, in the number for judging hard disk that each hard disk groups are included
Before whether amount meets greatest member's disk number, whether the group number m that storage system can also detect at least two hard disk groups is big
In preset group of number threshold value n, m and n be positive integer；When m is greater than n, determine at least two hard disk groups, volume type parameter
N-th big third hard disk groups；By at least two hard disk groups, the capacity class of the maximum m-n hard disk groups of volume type parameter
Shape parameter is revised as the capacity parameter of the third hard disk groups, the maximum hard disk groups number supported is arranged for storage system, to simplify
The computational complexity of storage system.
Optionally, there are also backup requests for the data stored in storage system, that is, need to stay at least two hard disk groups
Lower portion capacity is known as hot standby capacity as spare capacity, this incremental backup capacity.In the present invention, hot standby capacity can be according to each
The capacity of hard disk in a hard disk groups distributes, that is, corresponds to each hard disk groups, and the k hard drive space distributed in the hard disk groups is made
Enough volume spaces can be found to generation when guaranteeing that most k block hard disks break down in the hard disk groups for hot standby space
The hard disk of failure carries out data recombination；Wherein, k is properly termed as HotSpare disk number, and k is the integer more than or equal to 1.For example, extremely
A hard disk groups in few two hard disk groups include the hard disk of 10 300G capacity, and the numerical value of k is 1, then need from this at least two
Hot standby space of the volume space of 1*300G as the data in this 10 300G hard disks, and this 300G are distributed in a hard disk groups
Hot standby space be dispersed in as unit of disk block or disk set of blocks at least two hard disk groups.Consider above-mentioned hot standby want
It asks, in the present invention, above-mentioned pre-set disk number threshold value is also possible to 10+x, and x is 10 corresponding HotSpare disk numbers；When RAID is managed
When reason instruction instruction one RAID of creation, the greatest member's disk number needed of the RAID at least two hard disk groups can be set to
The sum of the member disk number that RAID to be created includes HotSpare disk number corresponding with the member disk number that the RAID to be created includes with
The larger value between pre-set disk number threshold value；It, can be by this extremely when RAID management instruction, which is used to indicate, deletes RAID
Greatest member's disk number that RAID in few two hard disk groups needs is set as deleting the corresponding member disk of remaining RAID after RAID
The sum of several maximum values HotSpare disk number corresponding with the maximum value, with the larger value of preset disk number threshold value between the two.
In the following, the present invention will be illustrated by taking a possible specific implementation as an example, which will be comprehensive
Close RAID member disk number, HotSpare disk number and the pre-set disk number threshold value considered in hard disk areas.
Table 1 is please referred to, is provided it illustrates one possible implementation of the present invention, the member disk number of certain type RAID
With the corresponding table of back-up disk number.
Table 1
In table 1, each RAID member disk number interval corresponds to two different HotSpare disk numbers, and respectively high fever is standby and low-heat
Standby, in this illustrative examples, a newly created RAID can independently be selected standby or low-heat is standby using high fever by user.
For example, the maximum of typical case RAID supports that member disk number is 10, referring to table 1, which supports the corresponding high HotSpare disk of member disk number
Several and low HotSpare disk number be 1 (if the corresponding high HotSpare disk number of maximum support member disk number is different with low HotSpare disk number,
It is subject to user setting)；When creating an atypia RAID with 36 member disks, if user's selection is standby using high fever
When, then the corresponding HotSpare disk number of member disk number 36 is 3, if user's selection is standby using low-heat, member disk number 36 is corresponding hot standby
Disk number is then 2.
The RAID that storage system receives creation hard disk areas manages instruction, includes preset disk number in RAID management instruction
Threshold value 11 (i.e. typical case RAID support the HotSpare disk number 1 corresponding with greatest member's disk number of greatest member's disk number 10 and).It deposits
Storage system combines method shown in above-mentioned Fig. 2 and Fig. 3 A to the capacity of at least two hard disk groups of one hard disk areas of composition first
Type parameter is modified, the total appearance in basis by the sum of capacity of hard disk of modified each hard disk groups as the hard disk areas
Amount, at the same record modification waste capacity, optionally, in the present invention, when by preset disk number threshold value at least two hard disks
When the volume type parameter of group is modified, modification waste capacity can be set to 0.Simultaneously by the preset disk number threshold value 11
It is recorded as modification threshold value.
When user creates a RAID, storage system obtains the member disk number and the member disk number of the RAID to be created
The sum of corresponding HotSpare disk number, and the member disk number HotSpare disk number corresponding with the member disk number for comparing the RAID to be created it
And with the size relation between the modification threshold value that has recorded, if the member disk number of the RAID to be created is corresponding with the member disk number
The sum of HotSpare disk number be greater than the modification threshold value recorded, then by the member disk number of the RAID to be created and the member disk number pair
The sum of HotSpare disk number answered is set as new modification threshold value.Storage system also generates RAID management instruction simultaneously, when modification threshold value
When having update, greatest member's disk number that the RAID at least two hard disk groups for including in RAID management instruction needs is update
Modification threshold value afterwards, storage system is according to the updated modification threshold value, and the method in conjunction with shown in Fig. 2 and Fig. 3 A is at least two
The volume type parameter of hard disk groups is modified, and after record modification at least two hard disk groups total capacity, will be recited above
The total capacity that basic total capacity subtracts this modified at least two hard disk groups just obtains the modification waste capacity of this modification.
If modification threshold value does not update, it can not include what the RAID at least two hard disk groups needed in RAID management instruction
Greatest member's disk number, storage system also do not modify to the volume type parameter of at least two hard disk groups.
For example, it is 1 that inquiry table 1, which obtains corresponding HotSpare disk number, then 5+1=6 if the member disk number of RAID to be created is 5,
Less than 11, at this point, keeping modification threshold value is 11 constant.If the member disk number of RAID to be created is 13, user selects hot standby side
Formula is that high fever is standby, then inquiry table 1 determines that corresponding HotSpare disk number is 2,13+2=15, is greater than 11, at this point, modification threshold value is updated
It is 15.
When user delete a RAID when, after storage system obtains the deletion RAID, storage system first determine whether to
Whether the sum of the member disk number of the RAID of deletion HotSpare disk number corresponding with the member disk number is equal to the modification threshold value recorded, if
The sum of the member disk number of RAID to be deleted HotSpare disk number corresponding with the member disk number is not equal to the modification threshold value recorded, then
It keeps the modification threshold value recorded constant, if being equal to, further obtains the maximum value of the member disk number of remaining each RAID
The sum of HotSpare disk number corresponding with the maximum value, and compare the sum of maximum value HotSpare disk number corresponding with the maximum value and preset
Disk number threshold value 11 between size relation, if the sum of maximum value HotSpare disk number corresponding with the maximum value be greater than 11, will
The sum of maximum value HotSpare disk number corresponding with the maximum value is as new modification threshold value, otherwise, by 11 as new modification threshold
Value.Storage system also generates RAID management instruction simultaneously, likewise, when modifying threshold value has update, in RAID management instruction
Greatest member's disk number that RAID at least two hard disk groups for including needs is updated modification threshold value, storage system according to
The updated modification threshold value, the method in conjunction with shown in Fig. 2 and Fig. 3 A carry out the volume type parameter of at least two hard disk groups
Modification.If modification threshold value does not update, the RAID at least two hard disk groups can not be included in RAID management instruction
The greatest member's disk number needed, storage system also do not modify to the volume type parameter of at least two hard disk groups.
Allocation capacity and heat when being whole progress calculation of capacity with hard disk areas, in the available hard disk areas
Standby capacity, calculate the hard disk areas use capacity are as follows: allocation capacity+modification waste capacity, calculate the hard disk areas can
With capacity are as follows: the hot standby capacity of allocation capacity-- modification wastes capacity to basic total capacity-.
Wherein, allocation capacity refers to the capacity dispensed as data space, for example, distributing to storage
The capacity of each RAID in system, and, when in storage system also including the data of separate storage, distribute to these independences
The capacity of the data of storage.
It should be noted that, when above-mentioned modification threshold value becomes larger, modification waste capacity may also in above-mentioned implementation
It can become larger, it is available in order to avoid output when modification waste capacity is greater than the basic total capacity-hot standby capacity of allocation capacity-
Capacity is negative value, will modification waste capacity when modification waste capacity is greater than the basic total capacity-hot standby capacity of allocation capacity-
Updating is the basic total capacity-hot standby capacity of allocation capacity-.
Referring to FIG. 4, it illustrates the block diagrams of the device of management RAID provided by one embodiment of the present invention.The device can
It is embodied as some or all of of the controller 130 of implementation environment shown in Fig. 1 in a manner of through hardware or soft or hard combination, uses
To execute all or part of step in the method as shown in Fig. 2 or Fig. 3 A.The apparatus may include:
Instruction receiving unit 401 has and the same or similar function of command reception module 1364e1；
Judging unit 402 has and the same or similar function of judgment module 1364e2；
Parameter determination unit 403 has and the same or similar function of parameter determination module 1364e3；
Parameter modifying unit 404 has and the same or similar function of parameter adapting module 1364e4；
Administrative unit 405 has and the same or similar function of management module 1364e5；
Detection unit 406 has and the same or similar function of detection module 1364e6；
Hard disk groups determination unit 407 has and the same or similar function of hard disk groups determining module 1364e7.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for managing RAID, which is characterized in that within the storage system, the storage system includes for the method application
At least two hard disk groups and controller, hard disk volume type parameter having the same included by each hard disk groups are described
Volume type parameter is used to indicate the capacity of the hard disk；The method is executed by controller, comprising:
RAID management instruction is received, the management instruction includes the greatest member that the RAID at least two hard disk groups needs
Disk number；
Judge whether the quantity for the hard disk that each hard disk groups are included meets greatest member's disk number；
It is determining with first hard disk when quantity of the hard disk included by the first hard disk groups is unsatisfactory for greatest member's disk number
The volume type parameter of immediate second hard disk groups of volume type parameter of group, the volume type parameter of second hard disk groups
Less than the volume type parameter of first hard disk groups；
The volume type parameter of first hard disk groups is revised as to the volume type parameter of second hard disk groups；
According to the modified volume type parameter, RAID management, the RAID are carried out at least two hard disk groups
Management includes: to create RAID, delete the hard disk areas of RAID or creation comprising at least two hard disk groups.
2. the method according to claim 1, wherein when RAID management instruction is used to indicate creation RAID
When, greatest member's disk number that the RAID at least two hard disk groups needs are as follows:
The member disk number that RAID to be created includes；
Alternatively,
The member disk number and the larger value of preset disk number threshold value between the two that RAID to be created includes.
3. the method according to claim 1, wherein deleting RAID when RAID management instruction is used to indicate
When, greatest member's disk number that the RAID at least two hard disk groups needs are as follows:
After RAID to be deleted is deleted, the maximum of the corresponding member disk number of remaining RAID at least two hard disk groups
Value；
Alternatively,
After RAID to be deleted is deleted, the maximum value of the corresponding member disk number of remaining RAID at least two hard disk groups
With the larger value of preset disk number threshold value between the two.
4. the method according to claim 1, wherein including institute when RAID management instruction is used to indicate creation
When stating the hard disk areas of at least two hard disk groups, greatest member's disk number that the RAID at least two hard disk groups needs is pre-
If disk number threshold value.
5. method according to any one of claims 1 to 4, which is characterized in that in the hard disk for judging that each hard disk groups are included
Quantity whether meet greatest member's disk number before, further includes:
It is positive integer that whether the group number m for detecting at least two hard disk groups, which is greater than preset group of number threshold value n, m and n,；
When m is greater than n, determine at least two hard disk groups, the big third hard disk groups of volume type parameter n-th；
By at least two hard disk groups, the volume type parameter of the maximum m-n hard disk groups of volume type parameter is revised as
The capacity parameter of the third hard disk groups.
6. a kind of device for managing RAID, which is characterized in that within the storage system, the storage system includes for described device application
At least two hard disk groups and controller, hard disk volume type parameter having the same included by each hard disk groups are described
Volume type parameter is used to indicate the capacity of the hard disk；Described device includes:
Instruction receiving unit, for receiving RAID management instruction, the management instruction includes at least two hard disk groups
Greatest member's disk number that RAID needs；
Judging unit, for judging whether the quantity of hard disk that each hard disk groups are included meets greatest member's disk
Number；
Parameter determination unit, when the quantity for the hard disk included by the first hard disk groups is unsatisfactory for greatest member's disk number,
The determining volume type parameter with immediate second hard disk groups of volume type parameter of first hard disk groups, described second is hard
The volume type parameter of disk group is less than the volume type parameter of first hard disk groups；
Parameter modifying unit, for the volume type parameter of first hard disk groups to be revised as to the capacity of second hard disk groups
Type parameter；
Administrative unit, for carrying out RAID at least two hard disk groups according to the modified volume type parameter
Management, the RAID management include: to create the hard disk area that RAID, deletion RAID or creation include at least two hard disk groups
Domain.
7. device according to claim 6, which is characterized in that when RAID management instruction is used to indicate creation RAID
When, greatest member's disk number that the RAID at least two hard disk groups needs are as follows:
The member disk number that RAID to be created includes；
Alternatively,
The member disk number and the larger value of preset disk number threshold value between the two that RAID to be created includes.
8. device according to claim 6, which is characterized in that delete RAID when RAID management instruction is used to indicate
When, greatest member's disk number that the RAID at least two hard disk groups needs are as follows:
After RAID to be deleted is deleted, the maximum of the corresponding member disk number of remaining RAID at least two hard disk groups
Value；
Alternatively,
After RAID to be deleted is deleted, the maximum value of the corresponding member disk number of remaining RAID at least two hard disk groups
With the larger value of preset disk number threshold value between the two.
9. device according to claim 6, which is characterized in that include institute when RAID management instruction is used to indicate creation
When stating the hard disk areas of at least two hard disk groups, greatest member's disk number that the RAID at least two hard disk groups needs is pre-
If disk number threshold value.
10. according to any device of claim 6 to 9, which is characterized in that described device further include:
Detection unit, for judge in the judging unit quantity for the hard disk that each hard disk groups are included whether meet it is described most
Before major member's disk number, whether the group number m for detecting at least two hard disk groups, which is greater than preset group of number threshold value n, m and n, is positive
Integer；
Hard disk groups determination unit, for determining at least two hard disk groups when m is greater than n, volume type parameter n-th is big
Third hard disk groups；
The parameter modifying unit is also used at least two hard disk groups, the maximum m-n hard disk of volume type parameter
The volume type parameter of group is revised as the capacity parameter of the third hard disk groups.
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