CN102200892A - Capacity expansion method based on dynamic redundant array of independent disks (RAID) system - Google Patents
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Abstract
The objective of the invention is to provide a capacity expansion method based on a dynamic redundant array of independent disks (RAID) system. The capacity expansion method comprises the following steps of: firstly, dividing the dynamic RAID system into a plurality of stripe sets; secondly, selecting one stripe set p, selecting a stripe set unit which is numbered p-q, moving to a newly-added disk which is numbered r, keeping the offset of the stripe set unit invariable, and updating an address mapping table, wherein q is equal to (p) mod (m+n), and r is equal to (q) mod (m+n); and finally, traversing all stripe sets according to the steps to finish capacity expansion. The dynamic RAID system is formed by introducing a stripe set concept to the conventional RAID system, so data is accessed by the stripe sets instead of the disk by introduction of the stripe sets. By the capacity expansion method, a theoretic data migration minimum can be reached, migration unit is the stripe set unit, and time require for migration of same data quantity is less.
Description
Technical field
The invention belongs to technical field of data storage, particularly relate to a kind of expansion method based on dynamic RAID system.
Background technology
The information that modern society produces, with 2002 be example, one year has produced the information of about 5EB, wherein 92% fresh information major part is stored in the disk, large capacity disc has become present requisite storage medium; The storage of important information seems particularly crucial such as company information, 50% the company that studies show that irreclaimable information occurred above ten days, data appear in 43% company closes down after forever losing at once, 93% company serious data occurs and loses the back bankruptcy, and data reliability is particularly important in data storage.And just storage system, obtained using very widely from its birth based on the memory technology of raid-array RAID, because the recovery of the obliterated data that adopts the storage system of RAID structure can guarantee the reliability of system and cause owing to disk failure, but continuous increase along with quantity of information, the data of depositing among the RAID also constantly increase, the disk active volume constantly reduces, when original design capacity has not satisfied the data increase, disk will face the predicament that the space exhausts.In case disk space exhausts, buy new disk then on new disk RAID the original RAID data of reconstruct be consuming time very large, but also be faced with several days when the machine time, this service request to the 7/24 present time is a very big challenge.
Summary of the invention
The object of the present invention is to provide a kind of expansion method based on dynamic RAID system, this expansion method can solve technical matterss such as traditional RAID system length consuming time and migration data amount in dilation process be big.
The invention provides a kind of expansion method based on dynamic RAID system, establishing the original disk number is m, and newly-increased disk number is n, and newly-increased disk is numbered 0 to n-1 respectively, and this method may further comprise the steps:
(1) be the band collection with dynamic RAID system divides;
(2) choose a band collection p, judge the p-q that is numbered that whether has a band collection unit among the band collection p, wherein p is band collection numbering, q=((p) mod (m+n)), if exist, then with this band collection cell moving to the newly-increased disk that is numbered r and keep the side-play amount of this band collection unit constant, and upgrade the address mapping table of this band collection unit, wherein r=((q) mod (n)); If do not exist, then do not do any operation;
(3) judge whether n equals 1, if change step (6) over to; Otherwise, make t=1, enter step (4);
(4) judge whether have band collection unit in the band collection (p+t) be numbered (p+t) q, if exist, then with this band collection cell moving to the newly-increased disk that is numbered r and keep the side-play amount of this band collection unit constant, and upgrade the address mapping table of this band collection unit, wherein (p+t) is band collection numbering; If do not exist, then do not do any operation;
(5) judge whether t equals (n-1), if enter step (6); Otherwise, make t=t+1, change step (4) over to;
(6) according to the operation of step (2) to (5), all band collection of dividing in the traversal step (1).
Proposed by the invention dynamic RAID system is the notion that has increased a band collection in traditional RAID system, and the introducing by the band collection makes that visiting data by disk becomes by the band collection and visit data.Expansion method based on dynamic RAID system of the present invention has following advantage with respect to traditional expansion method:
1. can be implemented in the line dilatation, avoided shutting down the situation that can't realizing of being caused served.
2. dilation process migration data amount is little, on the RAID that original m disk constitutes, increase n disk, in order to reach load balancing, theoretic data migtation minimum value is the n/ (m+n) that accounts for total amount of data, and expansion method of the present invention can reach this minimum value.
3. in data migration process, traditional RAID migration be the small data piece, and this method migration is big data block, the time of the same data volume needs of disk migration still less like this.
Description of drawings
The synoptic diagram of Fig. 1 collection and band;
Fig. 2 side-play amount synoptic diagram;
Fig. 3 sets up the address mapping table procedure chart;
Fig. 4 scheduler mapping table procedure chart;
Fig. 5 m=4, the disk dilation process figure of n=1;
Fig. 6 modified address mapping table procedure chart;
Fig. 7 data read process figure;
Fig. 8 m=4, the disk dilation process figure of n=2;
Fig. 9 data capacity reducing procedure chart.
Embodiment
Below in conjunction with accompanying drawing of the present invention and related example, dynamic RAID system is described more clearly and based on the expansion method of dynamic RAID system.
The basic structure of storage data is bands among the RAID, and stripe size has 16K, 32K, 64K, 128K, 256K several, and RAID5 generally gets 32K or 64K.Band is distributed in each disk, and a band can only have a data block in each disk, and this data block generally is called stripe cell.
Existing RAID is when structure, it all is the mode store data that adopts band, because band belongs to the less data acquisition of size ratio, can form a very big address mapping table during data migtation, therefore the present invention is in the notion of this proposition " band collection ", and the band collection is the bigger data acquisition of granularity, and band collection can be made of hundreds of even thousands of bands, each band collection forms the RAID of a small grain size, and these small grain size RAID need not consider the RAID rank.All stripe cell that belong to same band collection in each disk can be used as an integral body, and this integral body is called " band collection unit ".
Figure 1 shows that the RAID that forms by 4 disks, wherein A1, B1, four data blocks of C1, D1 constitute a band, A1, B1, C1, D1 are called stripe cell, the band collection that four bands constitute, A1 to A4, B1 to B4, C1 is called band collection unit to C4, D1 to D4.The realization of data migtation for convenience, below band collection and band collection unit are numbered, for a top band collection among Fig. 1 (being the band collection that A1 forms to C4, D1 to D4 to B4, C1 to A4, B 1), be numbered 0 (in computer major, to the numbering of storage medium all since 0), be numbered 1 for following band collection.The numbering of band collection unit also is since 0, and first band collection element number of concentrating at a band is 0, and to be 0, the second band collection element number be 1 to the numbering of band collection unit A1, B1, C1, D1 among Fig. 1, by that analogy.The numbering of band collection unit is an object of reference with the band collection, is the internal number of band collection, and this numbering does not change with moving of band collection unit.The overall situation numbering of band collection unit adds what the internal number of band collection was formed by the band collection numbering at its place, be numbered 1 as the band collection below among Fig. 1, band collection unit internal number on the disk 0 is 0, band collection unit internal number on the disk 1 is 1, and the overall situation of these two band collection unit is numbered 1-0 and 1-1 so.Under situation about not obscuring, this paper just is called the overall situation of band collection unit numbering the numbering of band collection unit.
The numbering of band collection unit can obtain according to the LBA address that main frame provides, and LBA is the linear address of an one dimension.When making up the band collection, it all is artificial the setting that band is concentrated the number of band and stripe size, suppose that band concentrates total e band, and the size of each band is s, so can be by LBA divided by (e * s) amasss, and the merchant who obtains is that the band collection is numbered.Suppose that each bar has m stripe cell, each stripe cell size is exactly s/m so.To the s delivery, divided by stripe cell size s/m, the merchant who obtains is exactly the internal number in the band collection element number this result by LBA.
Dynamic RAID of the present invention system comprises a plurality of disks and the RAID controller that constitutes RAID, the notion that this dynamic RAID system has logically divided the band collection, make a plurality of bands constitute a band collection, the similar sub-RAID of band collection, this dynamic RAID system also comprises an address mapping table, the positional information of all band collection unit of this map addresses table record.
Concretely, dynamically the band collection of RAID is a division in logic, when RAID builds, can dispose the quantity that band is concentrated band according to disk size, hard disk such as 150G, the size of stripe cell is 16KB, can select the size of 2M as a band collection unit so, just says that also band concentrates and to have 2M/16KB=128 band.Especially,, can dispose different RAID ranks, only think that in the present invention all band collection all are same ranks, illustrate with this for each band collection.Dynamically RAID is after having constructed such band collection, and the mobile data piece has also made up an address mapping table for convenience, and this address mapping table is made up of the two-stage table.The one-level table is a band collection table, each band set pair is answered a list item in the one-level table, each one-level table list item points to a secondary table, the position of all band collection unit of each band collection of record in the secondary table, there are three row the position of the corresponding band collection unit of each secondary table list item in the secondary table, first row are internal numbers of band collection unit, secondary series is represented the numbering of this place, band collection unit disk, and this side-play amount of band collection unit in disk is shown in the 3rd tabulation.Side-play amount is represented the band collection element number between this band collection unit and the disk starter strip collection unit, as shown in Figure 2, four band collection unit of band collection 0 are placed on the top of disk, the reference position of disk just, therefore side-play amount is 0, four band collection unit of band collection 1 are placed on the position apart from a band collection of disk reference position unit, so side-play amount is 1, by that analogy.
Address mapping table is a process of dynamically setting up, and whenever writes a band collection unit, just adds the secondary list item of this band collection unit correspondence.As shown in Figure 3, it has represented the process of setting up of address mapping table, is example to write band collection unit 0-0, earlier according to collection number 0, set up 0 of collection in the one-level table, and then set up the secondary table of collection 0 correspondence, and the numbering 0 of band collection unit 0-0, disk number 0, side-play amount 0 is inserted in the secondary table.When data move, revise corresponding secondary table content, as shown in Figure 4, band collection unit 0-0 is after original position moves to disk 4, at first search collection 0 one-level table,, revise disk number position disk 4 by collecting 0 position of finding band collection unit 0 in the secondary table, because the side-play amount of band collection unit 0-0 in disk 4 still is 0, so the side-play amount part does not change.Band collection unit 0-0 moves to after the reposition, numbering or 0-0, because this band collection unit still belongs to collection first band collection unit of 0, on data, its is preserved still collects the partial data that begins most in 0, and therefore numbering does not change.
When original m data in magnetic disk has surpassed certain value of total memory capacity, such as 80%, just need dilatation.In an original m disk, the band collection is made of m band collection unit, in case dilatation n disk, for load balancing, must move to newly-increased disk to partial data from original disk, make that the data volume of each disk is approximate identical, the visit capacity of each disk could be similar to identically like this, promptly needs all the band collection cell distribution on m the disk realization dilatation and load balancing in m+n the disk.
Expansion method based on dynamic RAID of the present invention, its basic thought is after increasing new disk, some band collection unit of the band collection on the original disk to be moved on the new disk, and guarantee the DATA DISTRIBUTION equilibrium, new band collection is formed in the space of newly vacating, and is used to store new data.Concrete data migtation mode has multiple, and every employing project organization of the present invention and thinking are done some simple designs that change or change, and all fall into the scope of protection of the invention.
Below with m=4, n=1 is that example is introduced data write method after the method for dynamic RAID dilatation and the dilatation in detail.
1. dynamic RAID expansion method
Data migtation does not need to move all data in expansion method of the present invention, as shown in Figure 5,4 disks are arranged in the original disk array, be numbered 0 to 3 respectively, increased a disk newly, be numbered new disk 0, each band collection is chosen a band collection cell moving to newly-increased disk, the white space that original disk moves out of data comes out with regard to vacant, can fill new data.
The expansion method detailed process is as follows:
(1) divides the band collection, have 128 bands with each band collection and be as the criterion and divide the number of record band collection.
(2) choose band collection 0, judge whether to exist band collection unit 0-0 (p=0, q=0mod 5), exist, then this band collection unit is moved on to newly-increased disk 0 (r=0mod n, n=1, so r here equals 0 forever);
(3) because n=1 directly selects next band to move;
(4) choose band collection 1, judge whether to exist band collection unit 1-1 (p=0, q=1mod 5), exist, then band collection unit 1-1 is moved to the 0th new disk;
(5) choose band collection 2, judge whether to exist band collection unit 2-2 (p=0, q=2mod 5), exist, then band collection unit 2-2 is moved to the 0th new disk;
(6) choose band collection 3, judge whether to exist band collection unit 3-3 (p=0, q=3mod 5), exist, then band collection unit 3-3 is moved to the 0th new disk;
(7) choose band collection 4, judge whether to exist band collection unit 4-4 (p=0, q=4mod 5), do not exist, then do not do any operation;
(8) data migtation of the next band collection of continuation, all band collection of dividing in the traversal step (1) according to the method described in the present invention.
After each band collection cell moving, need to upgrade the address mapping table of this band collection unit, the disk number that is about to this band collection unit changes to new disk number.
As seen from Figure 5, band collection unit number on each disk is the same, and with on 4 these zones from band collection 0 to the band collection, 4 band collection unit have been increased on the newly-increased disk, always have 20 band collection unit on original four disks, the data migtation amount is 4/20=0.2, and is identical with n/ (m+n)=1/5, reached theoretic minimum value.
2. the method for writing data after the disk dilatation
After data migtation is finished, in each disk all a lot of white spaces can appear, and these zones can be used for forming new band collection, fill in new data.The new data ablation process is finished in two steps, and the first step is that new data is write disk, and second step was to revise corresponding address mapping table.
Fig. 6 has shown and has write after the band collection 8 that the situation of modified address mapping table is only indicated the situation that band collection unit 8-1 corresponding address mapping table is made amendment on figure, and the modification process of all the other band collection unit is similar.After band collection unit 8-1 writes disk, at first search the one-level table at band collection 8 places, if do not have, expression band collection 8 is new datas, then adds the one-level list item of band collection 8, adds a secondary table then.According to the numbering of band collection unit, this band collection unit record is second row in secondary table.When dividing the band collection, disk and the side-play amount that each band collection unit is deposited calculated, and is 1 position if band collection unit 8-1 is placed on the side-play amount of disk 1, and the secondary list item of then filling in is: 8-1, disk 1, skew 1.
3. the method for reading data after the disk dilatation
Obtain the numbering of band collection unit according to the method for setting forth previously by the LBA address, visit band collection one-level table then, obtain the disk and the side-play amount at all places, band collection unit of whole band collection, thereby find this band collection unit and from the relevant position reading of data according to these information.
As shown in Figure 7, if want to read this band collection unit of 8-3, at first find the position of band collection 8 in the one-level table by 8 these values, the secondary table that next points to by the one-level table, find band collection unit 3 in the secondary table, the position that obtains to deposit this band collection unit is at disk 3, and side-play amount is 3, preferably reads disk 3 side-play amounts and be 3 band collection unit.
For m=4, the dynamic RAID expansion method of n=2, as shown in Figure 8, the band collection unit that moves is 0-0,1-0,1-1,2-1,2-2,3-2 etc.
4. the dynamic disk capacity reduction method of RAID
Except the expansion method of the above-mentioned dynamic RAID of this paper, dynamically RAID can also be used in the capacity reducing aspect.The process of capacity reducing is exactly that m disk reduced n, wherein m＞n.Capacity reducing has also comprised moving of data block, but the condition of capacity reducing is that the number of the band collection unit of composition band collection must be smaller or equal to m-n, otherwise the band collection unit that same band collection will occur belonging to is placed on the same disk, so just can not guarantee the reliability of data.
The capacity reducing process as shown in Figure 9, the situation that Fig. 9 only simply draws 4 collection.In the capacity reducing process, move a band collection unit at every turn, just the new disk number of band collection unit and disk bias internal amount are write secondary table, the process of change secondary table is the same when ablation process and migration, and the data block on n disk Removes All.
The present invention not only is confined to above-mentioned embodiment, persons skilled in the art are according to content disclosed by the invention, can adopt other multiple embodiment to implement the present invention, such as the data migtation mode of mentioning among the present invention, in order to reach the purpose that a plurality of disks can load balancing, in fact have the several data migration pattern.Therefore, every employing project organization of the present invention and thinking are done some simple designs that change or change, and all fall into the scope of protection of the invention.
Claims (5)
1. expansion method based on dynamic RAID system, establishing the original disk number is m, and newly-increased disk number is n, and newly-increased disk is numbered 0 to n-1 respectively, and this method may further comprise the steps:
(1) be the band collection with dynamic RAID system divides;
(2) choose a band collection p, judge the p-q that is numbered that whether has a band collection unit among the band collection p, wherein p is band collection numbering, q=((p) mod(m+n)), if exist, then with this band collection cell moving to the newly-increased disk that is numbered r and keep the side-play amount of this band collection unit constant, and upgrade the address mapping table of this band collection unit, wherein r=((q) mod(n)); If do not exist, then do not do any operation;
(3) judge whether n equals 1, if change step (6) over to; Otherwise, make t=1, enter step (4);
(4) judge whether have band collection unit in the band collection (p+t) be numbered (p+t)-q, if exist, then with this band collection cell moving to the newly-increased disk that is numbered r and keep the side-play amount of this band collection unit constant, and upgrade the address mapping table of this band collection unit, wherein (p+t) is band collection numbering; If do not exist, then do not do any operation;
(5) judge whether t equals (n-1), if enter step (6); Otherwise, make t=t+1, change step (4) over to;
(6) according to the operation of step (2) to (5), all band collection of dividing in the traversal step (1).
2. expansion method according to claim 1, it is characterized in that, described address mapping table is made up of one-level table and secondary table, the one-level table is a band collection table, each one-level table list item all points to a secondary table, secondary table is a band collection cell list, and each secondary table list item all writes down the position of a band collection unit.
3. expansion method according to claim 1 is characterized in that, described band collection unit is meant all stripe cell that belong to same band collection in each disk.
4. the method for writing data behind the RAID System Expansion according to claim 1 may further comprise the steps:
(1) data is write the band collection unit of disk empty;
(2) address mapping table of modification respective strap collection unit.
5. the method for reading data behind the RAID System Expansion according to claim 1 may further comprise the steps:
(1) obtains the numbering of the band collection unit at data place by the LBA address;
(2) find this band collection unit by address mapping table;
(3) reading of data from this band collection unit.
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| CN115437578A (en) * | 2022-11-04 | 2022-12-06 | 苏州浪潮智能科技有限公司 | Data migration method, device, equipment and medium of disk array |
| CN115437578B (en) * | 2022-11-04 | 2023-03-24 | 苏州浪潮智能科技有限公司 | Data migration method, device, equipment and medium of disk array |
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| CN115599313A (en) * | 2022-12-05 | 2023-01-13 | 苏州浪潮智能科技有限公司（Cn） | Disk array capacity expansion method, system, storage medium and equipment |
| CN115840540B (en) * | 2023-02-23 | 2023-05-02 | 苏州浪潮智能科技有限公司 | RAID array capacity expansion method, device, equipment, RAID card and medium |
| CN115840540A (en) * | 2023-02-23 | 2023-03-24 | 苏州浪潮智能科技有限公司 | RAID array capacity expansion method, device, equipment, RAID card and medium |
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