CN101625627B - Data read-in method, disc redundant array and controller thereof - Google Patents
Data read-in method, disc redundant array and controller thereof Download PDFInfo
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- CN101625627B CN101625627B CN2009100907249A CN200910090724A CN101625627B CN 101625627 B CN101625627 B CN 101625627B CN 2009100907249 A CN2009100907249 A CN 2009100907249A CN 200910090724 A CN200910090724 A CN 200910090724A CN 101625627 B CN101625627 B CN 101625627B
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Abstract
The embodiment of the invention relates to a data read-in method, a disc redundant array and a controller thereof, wherein the data read-in method comprises the following steps: receiving a read-in request message comprising data to be read in and a logical block address to be read in by the data; looking up a logical disc unit corresponding to the logical block address and an idle physical disc unit corresponding to the logical disc unit in a set logical independent disc redundant array RAID according to a mapping table; and reading the data to be read in into the idle physical disc unit. The embodiment of the invention can effectively improve the utilization rate of the disc.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of method of data, the controller and redundant arrays of inexpensive disks of redundant arrays of inexpensive disks of writing.
Background technology
How to increase the access speed of disk; How to prevent that data from losing because of the fault of disk, and how effectively to utilize disk space, be computer professional and user's puzzlement always; And the price of large capacity disc is very expensive, and the user is formed very big burden.
The generation of disk array technology solves these problems at one stroke.RAID (Redundant Array ofIndependent Drive, hereinafter to be referred as: advantage RAID) is present in three aspects, i.e. availability (Availability), capacity (Capacity) and performance (Performance).In storage system, utilize the benefit of RAID technology to mainly contain following three kinds: the one, through organizing together a plurality of disks,, disk crosses over function so that being provided as a logical volume, and these a plurality of disks are called member's dish of RAID; The 2nd, be written in parallel to or read a plurality of disks through being divided into data a plurality of data blocks (Block), to improve the speed of visit disk, this performance is called as the concurrency of RAID; The 3rd, through mirror image or verification operation fault-tolerant ability is provided.Select suitable RAID rank can satisfy the user according to actual conditions to storage system availability, capacity and performance demands.RAID rank commonly used has following several kinds: NRAID, JBOD, RAID0, RAID1, RAID0+1, RAID3, RAID5 or the like.
Existing RAID technology makes up based on whole magnetic disk, even a RAID group has only been used the little space on the disk, this disk also can't be distributed to other RAID once more and organize, thereby causes the space availability ratio of disk lower.
Summary of the invention
The embodiment of the invention provides a kind of method of data, the controller and redundant arrays of inexpensive disks of redundant arrays of inexpensive disks of writing, and can effectively improve the space availability ratio of disk.
The embodiment of the invention provides a kind of method that writes data, comprising:
Request message is write in reception, the said LBA that comprises in the request message that data to be written and said data to be written will write of writing;
In the logic RAID RAID that is provided with, search logic magnetic disc unit corresponding and the idle physical disk unit corresponding according to mapping table with said logic magnetic disc unit with said LBA;
Said data to be written are write in the said idle physical disk unit;
The setting of said logic RAID comprises: physical disk is divided into the physical disk unit according to setting size; Member according to required logic RAID is coiled quantity, is the logic magnetic disc that said member is coiled quantity with said physical disk dividing elements, thereby forms required logic RAID;
Said logic magnetic disc comprise be evenly distributed on said physical disk on corresponding said logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on said member on the said logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute the logic magnetic disc band, the logic magnetic disc unit on the said logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on said physical disk.；
Described method also comprises: when the idle physical disk unit corresponding with said logic magnetic disc unit breaks down, redistribute idle physical disk unit, and said data to be written are write in the idle physical disk unit of redistributing; Revise said mapping table, make said logic magnetic disc unit corresponding with the said idle physical disk unit of redistributing.
The embodiment of the invention also provides a kind of controller of redundant arrays of inexpensive disks, comprising:
Receiver module is used for receiving and writes request message, the said LBA that comprises in the request message that data to be written and said data to be written will write of writing;
Search module, be used for searching logic magnetic disc unit corresponding and the idle physical disk unit corresponding at the logic RAID RAID that is provided with said logic magnetic disc unit with said LBA according to mapping table;
Writing module is used for said data to be written are write said idle physical disk unit;
Module is set, is used to be provided with said logic RAID;
The said module that is provided with comprises: physical disk dividing elements unit is used for physical disk is divided into the physical disk unit according to setting size; The logic magnetic disc division unit is used for coiling quantity according to the member of required logic RAID, is the logic magnetic disc that said member is coiled quantity with said physical disk dividing elements, thereby forms required logic RAID;
Said logic magnetic disc comprise be evenly distributed on said physical disk on corresponding said logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on said member on the said logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute a logic magnetic disc band, the logic magnetic disc unit on the said logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on said physical disk;
Described controller also comprises: recombination module; Be used for when the idle physical disk unit corresponding with said logic magnetic disc unit breaks down; Redistribute idle physical disk unit, and said data to be written are write in the idle physical disk unit of redistributing; The mapping table modified module is used to revise said mapping table, makes said logic magnetic disc unit corresponding with the said idle physical disk unit of redistributing.
The embodiment of the invention is through being divided into disc unit with disk; Disc unit is formed required logic RAID as required; And adopt distribution technique when writing; With data to be written write with logic RAID in corresponding idle physical disk unit, logic magnetic disc unit in, effectively improved the space availability ratio of disk.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 writes the schematic flow sheet of method first embodiment of data for the present invention;
Fig. 2 writes the structural representation of mapping table among method first embodiment of data for the present invention;
Fig. 3 writes the schematic flow sheet of method second embodiment of data for the present invention;
Fig. 4 writes the physical disk synoptic diagram that is divided into the physical disk unit among method second embodiment of data for the present invention;
Fig. 5 writes the synoptic diagram of logic magnetic disc among method second embodiment of data for the present invention;
Fig. 6 is the structural representation of controller first embodiment of redundant arrays of inexpensive disks of the present invention;
Fig. 7 is the structural representation of controller second embodiment of redundant arrays of inexpensive disks of the present invention;
Fig. 8 is the structural representation of redundant arrays of inexpensive disks embodiment of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
As shown in Figure 1, the schematic flow sheet for the present invention writes method first embodiment of data can comprise the steps:
Request message is write in step 11, reception, and this writes the LBA that comprises in the request message that data to be written and these data to be written will write;
As shown in Figure 2; Write the structural representation of mapping table among method first embodiment of data for the present invention, wherein, have 4 logic magnetic disc: LD0, LD1, LD2 and LD3; DU0:0 represent with LD0 on corresponding idle physical disk unit, logic magnetic disc unit; This free time physical disk cell distribution on the 1st physical disk, DU1:0 represent with LD1 on corresponding idle physical disk unit, logic magnetic disc unit, this free time physical disk cell distribution is on the 2nd physical disk; ... DU6:0 represent with LD2 on corresponding idle physical disk unit, logic magnetic disc unit, this free time physical disk cell distribution is on the 7th physical disk;
The embodiment of the invention is through being divided into disc unit with disk; Disc unit is formed required logic RAID as required; And adopt distribution technique when writing; With data to be written write with logic RAID in corresponding idle physical disk unit, logic magnetic disc unit in, effectively improved the space availability ratio of disk.
As shown in Figure 3, for the present invention writes the schematic flow sheet of method second embodiment of data, on the basis of technical scheme shown in Figure 1, being provided with of logic magnetic disc can comprise the steps: in the step 12
Physical disk is divided into the physical disk unit according to setting size;
Member according to required logic RAID is coiled quantity, and the physical disk dividing elements is coiled the logic magnetic disc of quantity for the member, thereby forms required logic RAID.
Concrete, as shown in Figure 4, write the physical disk synoptic diagram that is divided into the physical disk unit among method second embodiment of data for the present invention; Suppose to have in the storage system 6 physical disks; Number from 0～5 respectively, that is, be numbered physical disk 0～physical disk 5.Storage system is divided into the physical disk unit according to setting each physical disk of big young pathbreaker; This sets size can be the integral multiple of the maximum configurable stripe depth of storage system; Be generally the multiple of 1 megabit (MB); Can use this moment " the physical disk element number in the physical disk numbering+physical disk " to carry out unique number for each physical disk unit; For example: DU 2:0 representes No. 0 physical disk unit of No. 2, physical disk, No. 2 physical disk unit of DU 5:2 number expression physical disk 5.
In the present embodiment; Logic magnetic disc comprise be evenly distributed on physical disk on corresponding logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on member on the logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute a logic magnetic disc band, the logic magnetic disc unit on the logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on physical disk.Concrete; As shown in Figure 5; Write the synoptic diagram of logic magnetic disc among method second embodiment of data for the present invention, have 7 physical disks in the system, LDU0 representes and is distributed in the 1st the logic magnetic disc unit that the physical disk unit on the physical disk is corresponding; LDU1 representes and is distributed in the 2nd the logic magnetic disc unit that the physical disk unit on the physical disk is corresponding ... LDU6 representes and is distributed in the 7th the logic magnetic disc unit that the physical disk unit on the physical disk is corresponding; Wherein, each row logic disc unit is formed logic magnetic disc: LD0, LD1, LD2 and LD3, and each row LDU forms the logic magnetic disc band: LDS0, LDS1, LDS2....Through layout, finally reach every row and the LDU that whenever lists all be evenly distributed in storage system in each physical disk on the physical disk unit corresponding.
As shown in Figure 3, on the basis of technical scheme shown in Figure 1, can also comprise after the step 13:
Step 31, when the idle physical disk unit corresponding with the logic magnetic disc unit breaks down, redistribute idle physical disk unit, and data to be written write in the idle physical disk unit of redistributing;
Present embodiment is through being divided into the physical disk unit with physical disk according to setting size; With the physical disk dividing elements is logic magnetic disc; When the user writes data,, data are write in the idle physical disk unit according to the corresponding relation of logic magnetic disc unit and physical disk unit; Thereby adopt distribution technique when writing, effectively improved the space availability ratio of disk.
In addition; In the present embodiment, when causing writing data failure, only need redistribute an idle disc unit when the part sector turns bad of physical disk; Data are write in the disc unit of redistributing get final product; Because the capacity of physical disk unit is less, so reorganization speed is than piece, thereby effectively improved reorganization speed.
As shown in Figure 6, the structural representation for controller first embodiment of redundant arrays of inexpensive disks of the present invention can comprise receiver module 61, search module 62 and writing module 63, wherein:
Receiver module 61 is used for receiving and writes request message, and this writes the LBA that comprises in the request message that data to be written and data to be written will write.
Writing module 63 is used for data to be written are write idle physical disk unit.
Present embodiment is divided into disc unit through disk; Disc unit is formed required logic RAID as required; And adopt distribution technique when writing; Through writing module 63 with data to be written write with logic RAID in corresponding idle physical disk unit, logic magnetic disc unit in, effectively improved the space availability ratio of disk.
As shown in Figure 7, for the structural representation of controller second embodiment of redundant arrays of inexpensive disks of the present invention, on the basis of structural representation shown in Figure 6, present embodiment can also comprise module 71 is set, and is used to be provided with logic RAID; This is provided with module 71 can comprise physical disk dividing elements unit 711 and logic magnetic disc division unit 712, wherein:
Physical disk dividing elements unit 711 is used for physical disk is divided into the physical disk unit according to setting size;
Logic magnetic disc division unit 712 is used for coiling quantity according to the member of required logic RAID, and the physical disk dividing elements is coiled the logic magnetic disc of quantity for the member, thereby forms required logic RAID.
In the present embodiment; Logic magnetic disc comprise be evenly distributed on physical disk on corresponding logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on member on the logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute a logic magnetic disc band, the logic magnetic disc unit on the logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on physical disk.
The controller of present embodiment redundant arrays of inexpensive disks can also comprise recombination module 72 and mapping table modified module 73, wherein:
Mapping table modified module 73 is used to revise mapping table, makes the logic magnetic disc unit corresponding with the idle physical disk unit of redistributing.
In the present embodiment; Physical disk dividing elements unit 711 is divided into the physical disk unit with physical disk according to setting size, and logic magnetic disc division unit 712 is a logic magnetic disc with the physical disk dividing elements, when the user writes data; Search module 62 and the corresponding relation of writing module 63 according to logic magnetic disc unit and physical disk unit; Data are write in the idle physical disk unit, thereby adopt distribution technique when writing, effectively improved the space availability ratio of disk.
In addition; In the present embodiment, when the part sector turns bad of physical disk and when causing writing data failure, only need recombination module 72 to redistribute an idle disc unit; Data are write in the disc unit of redistributing get final product; Because the capacity of physical disk unit is less, the rapid speed of therefore recombinating, thus effectively improved reorganization speed.
As shown in Figure 8, be the structural representation of redundant arrays of inexpensive disks embodiment of the present invention, can comprise controller 81 and physical disk 82;
Need to prove that controller 81 can comprise arbitrary module among the embodiment of controller of aforementioned redundant arrays of inexpensive disks, repeats no more at this.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, (Read-Only Memory is called for short: ROM) or at random store memory body (Random Access Memory is called for short RAM) etc. read-only storage memory body.
What should explain at last is: above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and the scope of technical scheme of the present invention.
Claims (2)
1. a method that writes data is characterized in that, comprising:
Request message is write in reception, the said LBA that comprises in the request message that data to be written and said data to be written will write of writing;
In the logic RAID that is provided with, search logic magnetic disc unit corresponding and the idle physical disk unit corresponding according to mapping table with said logic magnetic disc unit with said LBA;
Said data to be written are write in the said idle physical disk unit;
The setting of said logic RAID comprises:
Physical disk is divided into the physical disk unit according to setting size;
Member according to required logic RAID is coiled quantity, is the logic magnetic disc that said member is coiled quantity with said physical disk dividing elements, thereby forms required logic RAID;
Said logic magnetic disc comprise be evenly distributed on said physical disk on corresponding said logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on said member on the said logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute the logic magnetic disc band, the logic magnetic disc unit on the said logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on said physical disk;
Described method also comprises:
When the idle physical disk unit corresponding with said logic magnetic disc unit breaks down, redistribute idle physical disk unit, and said data to be written are write in the idle physical disk unit of redistributing;
Revise said mapping table, make said logic magnetic disc unit corresponding with the said idle physical disk unit of redistributing.
2. the controller of a redundant arrays of inexpensive disks is characterized in that, comprising:
Receiver module is used for receiving and writes request message, the said LBA that comprises in the request message that data to be written and said data to be written will write of writing;
Search module, be used for searching logic magnetic disc unit corresponding and the idle physical disk unit corresponding at the logic RAID that is provided with said logic magnetic disc unit with said LBA according to mapping table;
Writing module is used for said data to be written are write said idle physical disk unit;
Module is set, is used to be provided with said logic RAID;
The said module that is provided with comprises:
Physical disk dividing elements unit is used for physical disk is divided into the physical disk unit according to setting size;
The logic magnetic disc division unit is used for coiling quantity according to the member of required logic RAID, is the logic magnetic disc that said member is coiled quantity with said physical disk dividing elements, thereby forms required logic RAID;
Said logic magnetic disc comprise be evenly distributed on said physical disk on corresponding said logic magnetic disc unit, physical disk unit; Wherein, Be evenly distributed on said member on the said logic magnetic disc and coil the logic magnetic disc unit of quantity and constitute a logic magnetic disc band, the logic magnetic disc unit on the said logic magnetic disc band is corresponding with physical disk unit on being evenly distributed on said physical disk;
Described controller also comprises:
Recombination module is used for when the idle physical disk unit corresponding with said logic magnetic disc unit breaks down, redistributing idle physical disk unit, and said data to be written is write in the idle physical disk unit of redistributing;
The mapping table modified module is used to revise said mapping table, makes said logic magnetic disc unit corresponding with the said idle physical disk unit of redistributing.
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