CN101329641A - Method for rebuilding data of magnetic disk array - Google Patents
Method for rebuilding data of magnetic disk array Download PDFInfo
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- CN101329641A CN101329641A CNA2008100479773A CN200810047977A CN101329641A CN 101329641 A CN101329641 A CN 101329641A CN A2008100479773 A CNA2008100479773 A CN A2008100479773A CN 200810047977 A CN200810047977 A CN 200810047977A CN 101329641 A CN101329641 A CN 101329641A
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Abstract
The invention relates to a disk array data reconstruction method which pertains to a computer data storage method and solves the problem that the existing disk array data reconstruction method takes too much time and affects the reading and writing performances and reliability of a storage system. A disk array of the invention is provided with a main control module, reading and writing processing modules and a reconstruction module and comprises the steps of initialization, diary pot diagram update, reconstruction based on diaries and finishing. The method instructs data reconstruction process by the real-time monitoring of disk space using status of the disk array; when space that is not accessed is reconstructed, the only requirement is to write 0 in all corresponding data blocks newly added into a disk, thus greatly reducing physical disk visiting time brought by reconstruction, increasing reconstruction speed and reducing the response time of user access; the reconstruction method does not change the reconstruction procedure or the distribution manner of disk array data, can conveniently optimize various traditional disk array data reconstruction methods and is applicable to the construction of storage systems with high performance, high usability and high reliability.
Description
Technical field
The invention belongs to the computer data storage means, be specifically related to a kind of data re-establishing method of disk array.
Background technology
Along with the development of the computer technology and the network communications technology, the level of informatization is more and more higher, and people are also more and more higher to the requirement of data reliability.Disk array RAID (Redundant Array ofIndependent Disks) is an exemplary device in the reliable memory system field, compare with single disk, the performance of disk array, availability and reliability all have sizable raising, wherein, mirror image, parity checking, Hot Spare etc. all are disk array fault-tolerant techniques commonly used.When some member's disks in the disk array break down and add new disk, disk array can automatically switch to reconstruct mode, process of rebuilding is reconstructed into the data block on the faulty disk in the initiate disk under the situation of not interrupting application service continuously, all data blocks all return in the initiate disk on faulty disk, and disk array turns back to the normal read WriteMode.Because current application service all requires employed storage subsystem to have high-performance, high availability and high reliability simultaneously, application program not only requires disk array can rebuild data on the faulty disk when member's disk breaks down, the more important thing is that it can reduce the reliability that reconstruction time guarantees system as much as possible, and will reduce the influence of process of reconstruction as much as possible, so the data re-establishing method of disk array is most important to system performance.
In recent years, along with the continuous development of computer technology, disk size was increasing, and the growth of disk locating speed is well below the growth rate of disk size and bandwidth.Studies show that disk size is with annual 60% speed increment, bandwidth is annual to increase by 40%, and the seek time of disk and the rotation latency delays is annual just reduces 8%.In addition, studies show that in addition that all the elements that sequentially read on the disk that capacity is 1～10TB need 5～15 hours, then need 15～150 days if read randomly.Experiment is found to visit when frequent at I/O, and for disk array rank 5, the disk of rebuilding a 500GB needs several days time.These researchs and experiment all show, along with the slow raising with access speed of increasing rapidly of disk size, the data reconstruction processes of disk array needs the increasing time, has had a strong impact on the reliabilty and availability based on the storage system of disk array.
The data re-establishing method of disk array Control Software in the existing (SuSE) Linux OS kernel, even there is a large amount of disk spaces since disk array is created, all not to be used, process of reconstruction also all must read the data block on all working dish, behind the calculation check result is write in the initiate disk, thus, process of reconstruction needs the too much time, has influenced the readwrite performance and the reliability of storage system.
Summary of the invention
The present invention proposes a kind of data re-establishing method of disk array, and solving existing method for rebuilding data of magnetic disk array needs readwrite performance and the reliability problems that the time is too much, influence storage system.
The data re-establishing method of a kind of disk array of the present invention is provided with main control module, read-write processing module and rebuilding module on the disk array, comprise initialization, daily record bitmap table upgrade, based on the reconstruction and the end step of daily record; It is characterized in that:
(1) initialization step, order is carried out following process:
(1.1), open existing disk array or create new disk array according to user instruction;
(1.2) main control module is created the daily record bitmap table of this disk array, a band of each corresponding disk array of daily record bitmap table;
(1.3) whether this disk array of master control module judges is the new disk array of creating, and is then to turn over journey (1.4), otherwise turns over journey (1.5);
(1.4) main control module all is initialized as 0 with all positions in its daily record bitmap table, and the data block on all member's disks in the disk array all is initialized as 0, carries out step (2);
(1.5) main control module read the daily record bitmap table information deposited in this disk array member disk superblock in internal memory so that to its real time modifying, carry out step (2);
(2) daily record bitmap table step of updating, carry out following process:
(2.1) this disk array is waited for upper layer commands, and judges whether it is write request, is then to turn over journey (2.2), otherwise turns over journey (2.4);
(2.2) receive write request, the read-write processing module with the band of the corresponding disk array of this write request institute in the daily record bitmap table corresponding be updated to 1, indicate the accessed mistake of this band;
(2.3) the read-write processing module is sent to the bottom disk unit with this write request, and the data of write request are write the tram of disk array member disk, turns over journey (2.1);
(2.4) receive read request, the read-write processing module is sent to the bottom disk unit with this read request, from the tram reading of data of disk array member disk, turns over journey (2.1);
(3) based on the reconstruction procedures of daily record, when main control module finds that disk array member disk breaks down, carry out following process:
(3.1) rebuilding module judges whether a certain band of disk array corresponding position in the daily record bitmap table is 0, is then to turn over journey (3.2), otherwise turns over journey (3.3);
(3.2) the never accessed mistake of this band, the data block that is positioned at this band in initiate Replace Disk and Press Anykey To Reboot all writes 0, turns over journey (3.4);
(3.3) the accessed mistake of this band reads the data block that is positioned at this band on all working dish, behind the calculation check result is write the data block that is positioned at this band in the initiate Replace Disk and Press Anykey To Reboot, turns over journey (3.4);
(3.4) repeat (3.1)--(3.3), all bands are all rebuild and are finished on disk array;
(4) end step, when the user sends instruction when closing disk array, carry out following process:
(4.1) close before the disk array, main control module is saved in the daily record bitmap table in the superblock of each member's disk of disk array;
(4.2) close this Disk Array, discharge relevant resource.
The present invention is based on a ubiquitous phenomenon, promptly disk failure rate when just bringing into use is higher, and the space availability ratio of disk array is very low when causing member's disk of disk array to break down, and the never accessed mistake of band of quite a few is arranged in the disk array.The present invention instructs the data reconstruction processes of disk array by the disk space operating position of monitoring disk array in the piece level in real time, only need when rebuilding not accessed space in initiate disk, all to write 0 in the corresponding data block, significantly reduced and rebuild the physical disk access times of bringing, thereby accelerated reconstruction speed and reduced response time of user capture.In addition, the present invention has only changed the not method for reconstructing of usage space, do not change the flow process of reconstruction or the data distribution method of disk array, so can optimize the method for reconstructing of various traditional disk arrays easily, be applicable to that structure has high-performance, the storage system based on disk array of high availability and high reliability.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention;
Fig. 2 is an initialization step process synoptic diagram of the present invention;
Fig. 3 is a daily record bitmap table step of updating process synoptic diagram of the present invention;
Fig. 4 is the reconstruction procedures process synoptic diagram based on daily record of the present invention;
Fig. 5 is an end step process synoptic diagram of the present invention;
Fig. 6 is a new data of magnetic disk array initialization synoptic diagram of the present invention;
Fig. 7 is that the data that the present invention is directed to the disk array of accessed band are rebuild synoptic diagram;
Fig. 8 the present invention is directed to the not data reconstruction synoptic diagram of the disk array of accessed band.
Embodiment
Be example with disk array rank 5 below, the present invention is described in more detail in conjunction with the accompanying drawings.
Fig. 1 concerns synoptic diagram for each step of the present invention: enter daily record bitmap table step of updating after initialization step is finished, disk array member disk enters the reconstruction procedures based on daily record when breaking down, when the user sends out code, enter end step.
Fig. 2 is an initialization step process synoptic diagram of the present invention, carries out following operation:
According to user instruction, to open existing disk array or create new disk array, main control module is created the daily record bitmap table of this disk array, a band of each corresponding disk array of daily record bitmap table; Whether this disk array of master control module judges is the new disk array of creating, be then all positions in its daily record bitmap table all to be initialized as 0, and the data block on all member's disks in the disk array all is initialized as 0, otherwise read the daily record bitmap table information deposited in this disk array member disk superblock in internal memory so that to its real time modifying.
Fig. 3 is a daily record bitmap table step of updating process synoptic diagram of the present invention, carries out following step:
When disk array is received request, judge at first whether this request is write request, be then read and write processing module with this write request the band of corresponding disk array corresponding position in the daily record bitmap table be updated to 1, indicate the accessed mistake of this band, then this write request is sent to the bottom disk unit, the data of write request are write the tram of disk array member disk, otherwise the read-write processing module is sent to the bottom disk unit with this read request, from the tram reading of data of disk array member disk.
Fig. 4 is the reconstruction procedures process synoptic diagram based on daily record of the present invention, carries out following step:
Rebuilding module judges whether a certain band of disk array corresponding position in the daily record bitmap table is 0, be that the data block that then is positioned at this band in initiate Replace Disk and Press Anykey To Reboot all writes 0, otherwise read the data block that is positioned at this band on all working dish, behind the calculation check result write the data block that is positioned at this band in the initiate Replace Disk and Press Anykey To Reboot.Above-mentioned steps repeats, and all bands are all rebuild and finished on this disk array.
Fig. 5 is an end step process synoptic diagram of the present invention: main control module is saved in the daily record bitmap table in the superblock of each member's disk of disk array, closes this Disk Array then, discharges relevant resource.
Fig. 6 is a new data of magnetic disk array initialization synoptic diagram of the present invention: main control module creates the daily record bitmap table of this new disk array and all positions all are initialized as 0 with it, simultaneously the data block on all member's disks in the disk array all is initialized as 0.Disk array shown in Figure 6 comprises 4 member's disks, is respectively disk 1, disk 2, disk 3 and disk 4.D0, D1 ... D11 is the data block of disk array, contain data message, P0-2 is the parity values of data block D0, D1 and D2, P3-5 is the parity values of data block D3, D4 and D5, P6-8 is the parity values of data block D6, D7 and D8, and P9-11 is the parity values of data block D9, D10 and D11.Each corresponding disk array band is a band as D0, D1, D2 and PO-2 in the daily record bitmap table, and the rest may be inferred.The position of daily record bitmap table is 0 o'clock, represents the not accessed mistake of band of its pairing disk array, and the position of daily record bitmap table is 1 o'clock, represents the accessed mistake of band of its pairing disk array.0 expression on arrow on the disk and arrow next door all is initialized as 0 with the data block on all member's disks in the disk array.
Fig. 7 is that the data that the present invention is directed to the disk array of accessed band are rebuild synoptic diagram, carries out following operation:
Read the data block that is positioned at this band on all working dish, after the calculating parity checking result is write the data block that is positioned at this band in the initiate Replace Disk and Press Anykey To Reboot, finish the data of faulty disk on this band and rebuild.As shown in Figure 7, disk 3 is a faulty disk, and disk 1, disk 2 and disk 4 are scratch diskette, and last dish is initiate Replace Disk and Press Anykey To Reboot, symbol
Parity checking is calculated in expression, will be written among the D2 after D0, D1 and the PO-2 calculating parity checking among the figure.
Fig. 8 the present invention is directed to the not data reconstruction synoptic diagram of the disk array of accessed band: the data block that is positioned at this band in initiate disk all writes 0.0 expression on arrow shown in Figure 8 and arrow next door is sent data block not accessed in the Replace Disk and Press Anykey To Reboot and is write 0 order.
Claims (1)
1. the data re-establishing method of a disk array is provided with main control module, read-write processing module and rebuilding module on the disk array, comprise initialization, daily record bitmap table upgrade, based on the reconstruction and the end step of daily record; It is characterized in that:
(1) initialization step, order is carried out following process:
(1.1), open existing disk array or create new disk array according to user instruction;
(1.2) main control module is created the daily record bitmap table of this disk array, a band of each corresponding disk array of daily record bitmap table;
(1.3) whether this disk array of master control module judges is the new disk array of creating, and is then to turn over journey
Otherwise turn over journey (1.5) (1.4);
(1.4) main control module all is initialized as 0 with all positions in its daily record bitmap table, and the data block on all member's disks in the disk array all is initialized as 0, carries out step (2);
(1.5) main control module read the daily record bitmap table information deposited in this disk array member disk superblock in internal memory so that to its real time modifying, carry out step (2);
(2) daily record bitmap table step of updating, carry out following process:
(2.1) this disk array is waited for upper layer commands, and judges whether it is write request, is then to turn over journey
Otherwise turn over journey (2.4) (2.2);
(2.2) receive write request, the read-write processing module with the band of the corresponding disk array of this write request institute in the daily record bitmap table corresponding be updated to 1, indicate the accessed mistake of this band;
(2.3) the read-write processing module is sent to the bottom disk unit with this write request, and the data of write request are write the tram of disk array member disk, turns over journey (2.1);
(2.4) receive read request, the read-write processing module is sent to the bottom disk unit with this read request, from the tram reading of data of disk array member disk, turns over journey (2.1);
(3) based on the reconstruction procedures of daily record, when main control module finds that disk array member disk breaks down, carry out following process:
(3.1) rebuilding module judges whether a certain band of disk array corresponding position in the daily record bitmap table is 0, is then to turn over journey (3.2), otherwise turns over journey (3.3);
(3.2) the never accessed mistake of this band, the data block that is positioned at this band in initiate Replace Disk and Press Anykey To Reboot all writes 0, turns over journey (3.4);
(3.3) the accessed mistake of this band reads the data block that is positioned at this band on all working dish, behind the calculation check result is write the data block that is positioned at this band in the initiate Replace Disk and Press Anykey To Reboot, turns over journey (3.4);
(3.4) repeat (3.1)-(3.3), all bands are all rebuild and are finished on disk array;
(4) end step, when the user sends instruction when closing disk array, carry out following process:
(4.1) close before the disk array, main control module is saved in the daily record bitmap table in the superblock of each member's disk of disk array;
(4.2) close this Disk Array, discharge relevant resource.
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| CN101887386A (en) * | 2010-06-02 | 2010-11-17 | 深圳市迪菲特科技股份有限公司 | Method and system for processing failure of redundant array of independent disk controller |
| CN101997919A (en) * | 2010-11-16 | 2011-03-30 | 杭州宏杉科技有限公司 | Storage resource management method and device |
| CN102306128A (en) * | 2011-09-16 | 2012-01-04 | 北京星网锐捷网络技术有限公司 | Disk management method and device and network equipment |
| CN102341792A (en) * | 2009-03-04 | 2012-02-01 | 美光科技公司 | Memory block management |
| CN102521074A (en) * | 2011-12-01 | 2012-06-27 | 浪潮电子信息产业股份有限公司 | Method for quickening recovery of redundant array of independent disk (RAID) 5 |
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| CN105549908A (en) * | 2015-12-14 | 2016-05-04 | 深圳市万拓存储技术有限公司 | Method for restoring redundancy for RAID (Redundant Array of Independent Disks) disk array |
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| CN102341792A (en) * | 2009-03-04 | 2012-02-01 | 美光科技公司 | Memory block management |
| CN102341792B (en) * | 2009-03-04 | 2014-05-07 | 美光科技公司 | Memory block management |
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