CN104598336A - Rebuilding method and device based on RAID (redundant array of independent disk) algorithm - Google Patents
Rebuilding method and device based on RAID (redundant array of independent disk) algorithm Download PDFInfo
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- CN104598336A CN104598336A CN201510058699.1A CN201510058699A CN104598336A CN 104598336 A CN104598336 A CN 104598336A CN 201510058699 A CN201510058699 A CN 201510058699A CN 104598336 A CN104598336 A CN 104598336A
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Abstract
The invention provides a rebuilding method based on an RAID (redundant array of independent disk) algorithm. The method comprises the following steps that during data rebuilding, a strip lock of a strip to be rebuilt is obtained, and data of the strip is read; data of a disk to be rebuilt is constructed and written according to the read data. The invention also provides a rebuilding device based on the RAID algorithm. The rebuilding device comprises a reading module and a writing module. Through a rebuilding thread independent from the RAID algorithm, the process relevant to the rebuilding in the RAID algorithm is subjected to high-degree abstraction, and can be intervened by events received by an RAID structure, the realization process of each RAID algorithm is simplified, and the maintenance of the whole system is easier.
Description
Technical field
The present invention relates to field of computer technology, be specifically related to the method for reconstructing based on RAID algorithm and device.
Background technology
Disk array (Redundant Arrays of independent Disks is called for short RAID), has the meaning of " array with redundant ability that independent disk is formed ".Principle utilizes array mode to make disk group, coordinates the design of data scatter arrangement, promotes the security of data.Disk array is by the more cheap disk of a lot of price, is combined into the disk group that a capacity is huge, utilizes indivedual disk to provide data to produce the whole disk system usefulness of addition effect promoting.Utilize this technology, data are cut into many sections, leave in respectively on each hard disk.When data reconstruction, by data as calculated after again insert in new hard disk.
In traditional RAID, because the principle of each algorithm inside is different, therefore in specific algorithm, provide method for reconstructing often, produced by certain concrete algoritic module and rebuild thread.
Traditional method for reconstructing, each algorithm is needed to realize method for reconstructing all separately, not only create the code that large amount of complex is difficult to safeguard like this, add and safeguard risk, and algorithm outside cannot be intervened reconstruction, switching efficiently and effectively cannot plant or start reconstruction thread when state changes.
Summary of the invention
For the defect of prior art, the invention provides a kind of method for reconstructing based on RAID and device, by independent of the reconstruction thread outside RAID algorithm, make to obtain high abstraction about the process of rebuilding in RAID algorithm, and the event intervention that can be received by RAID structure, simplify the implementation procedure of each algorithm of RAID, make whole system more easily safeguard.
First aspect, the invention provides a kind of method for reconstructing based on RAID algorithm, and described method comprises:
When carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band;
The data of dish needing to rebuild are write according to the described data configuration read.
Preferably, described when carrying out data reconstruction, the bar obtaining band is locking, and before reading the step of the data of described band, described method also comprises:
Judge that whether disk array RAID is effective, if effectively, then read the data of band, otherwise stop rebuilding thread.
Preferably, described by after the step of the position of the described data Write fault dish of reading, described method also comprises:
The reconstruction marking described band in the bitmap bitmap of RAID completes.
Preferably, the data of the described band of described reading, comprising:
Structure reads the data that IO reads described band.
Preferably, the described described data configuration according to reading also writes the data needing the dish rebuild, and comprising:
According to the described data configuration call back function read, described data write is needed the dish rebuild.
Second aspect, the invention provides a kind of reconstructing device based on RAID algorithm, and described device comprises:
Read through model, for when carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band;
Writing module, for writing according to the described data configuration read the data of dish needing to rebuild.
Preferably, described device also comprises:
Determination module, for judging that whether disk array RAID is effective, if effectively, then reads the data of band, otherwise stops rebuilding thread.
Preferably, described device also comprises:
Mark module, completes for the reconstruction marking described band in the bitmap bitmap of RAID.
Preferably, described read through model, specifically for:
Structure reads the data that IO reads described band.
Preferably, described writing module, specifically for:
According to the described data configuration call back function read, described data write is needed the dish rebuild.
As shown from the above technical solution, the invention provides a kind of method for reconstructing based on RAID and device, by independent of the reconstruction thread outside RAID algorithm, make to obtain high abstraction about the process of rebuilding in RAID algorithm, and the event intervention that can be received by RAID structure, simplify the implementation procedure of each algorithm of RAID, make whole system more easily safeguard.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these figure.
Fig. 1 is the schematic flow sheet of the method for reconstructing based on RAID algorithm that one embodiment of the invention provides;
Fig. 2 is the schematic flow sheet of the method for reconstructing based on RAID algorithm that another embodiment of the present invention provides;
Fig. 3 is the structural representation of the reconstructing device based on RAID algorithm that one embodiment of the invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, Fig. 1 shows the process flow diagram of the method for reconstructing based on RAID algorithm that one embodiment of the invention provides, and the method comprises the steps:
101, when carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band.
Wherein, structure reads the data that IO reads described band.
102, write according to the described data configuration read the data of dish needing to rebuild.
Wherein, according to the described data configuration call back function read, described data write is needed the dish rebuild.
Alternatively, also comprise before step 101: judge that whether disk array RAID is effective, if effectively, then read the data of band, otherwise stop rebuilding thread.
Alternatively, also comprise after step 102: the reconstruction marking described band in the bitmap bitmap of RAID completes.
Specifically, the object of rebuilding in RAID algorithm is, as RAID because after the extracting or damage and be in degrading state of module dish, due to the insertion of disk or entering of HotSpare disk, RAID is made to enter reconstruction state, in this case, correct in order to ensure the information of data disks in RAID group and check disk, need the data ensureing once to drop out the position of disk to be re-write.
In fact rebuild for thread for each, if in units of band, process of reconstruction can be summed up as the information in reading disk, and writes the information of once out of order dish, two steps.In the present invention, only need RAID generic structure to provide, add bar locking, and the call back function writing once out of order dish data just can complete the process of reconstruction.
Specific works flow process of the present invention:
Start the process of rebuilding, the progress of reconstruction is all count from 0, and each unit rebuild is 1 band, after each reconstruction writes into, can mark this and rebuild in the bitmap of RAID at every turn.Start directly to skip when running into rebuilt band in scan rebuilding process in the past.Whether the process of reconstruction of each band is that the bar obtaining this band is locking, be suitable for continuing to rebuild under checking RAID current state, if be applicable to, reads the data of this band, then call corresponding RAID algorithm write back tune.
For each RAID algorithm, without the need to being concerned about the scheduling of thread resources, with the reading of data, only need pay close attention to how from one section of continuous print data strip, calculate or directly intercept out data, and sending in the disk being marked as and demoting and extract, and the reconstruction module taken out provides time-out independently, start, regulate the interfaces such as thread priority, call for RAID management framework.
The method that the present embodiment provides, simplify the reconstruction process logic of RAID algorithm, enhance the maintainability of algorithm, enhance the ability of RAID corresponding time, decrease the time that state switches, more promptly open and suspend reconstruction thread, removing bad to disk and the phenomenon of flash has very great help.
As shown in Figure 2, Fig. 2 shows another the comparatively process flow diagram of the method for reconstructing based on RAID algorithm of providing of specific embodiment of the present invention, and the method comprises the steps:
201, judge that whether RAID is effective, if so, then go to step 203, otherwise go to step 202.
202, stop rebuilding thread and exiting.
203, judge to rebuild thread whether to receive and suspend request, if so, then device step 204, otherwise device step 205.
204, reconstruction thread be adjusted to halted state and exit.
205, bar is obtained locking.
206, structure is read IO and is read strip data.
207, the data of the dish that need rebuild are write according to the data configuration read.
208, released strip is locking.
209, judge whether reconstruction completes, and if so, then goes to step, otherwise goes to step 211.
210, stop rebuilding thread and exiting.
211, recall reconstruction thread waits to be scheduled next time.
Present embodiments provide a kind of method for reconstructing based on RAID and device, by independent of the reconstruction thread outside RAID algorithm, make to obtain high abstraction about the process of rebuilding in RAID algorithm, and the event intervention that can be received by RAID structure, simplify the implementation procedure of each algorithm of RAID, make whole system more easily safeguard.
As shown in Figure 3, Fig. 3 shows the structural representation of the reconstructing device based on RAID algorithm that one embodiment of the invention provides, and this device comprises: read through model 301 and writing module 302.
Read through model 301, for when carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band.
Writing module 302, for writing according to the described data configuration read the data of dish needing to rebuild.
Wherein, described device also comprises: determination module, for judging that whether disk array RAID is effective, if effectively, then reads the data of band, otherwise stops rebuilding thread.
Wherein, described device also comprises: mark module, completes for the reconstruction marking described band in the bitmap bitmap of RAID.
Wherein, read through model 301, specifically for: structure reads the data that IO reads described band.
Wherein, writing module 302, specifically for: according to the described data configuration call back function read, described data write is needed the dish rebuild.
Above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; It still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. based on a method for reconstructing for RAID algorithm, it is characterized in that, described method comprises:
When carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band;
The data of dish needing to rebuild are write according to the described data configuration read.
2. method according to claim 1, is characterized in that, described when carrying out data reconstruction, and the bar obtaining band is locking, and before reading the step of the data of described band, described method also comprises:
Judge that whether disk array RAID is effective, if effectively, then read the data of band, otherwise stop rebuilding thread.
3. method according to claim 1, is characterized in that, described by after the step of the position of the described data Write fault dish of reading, described method also comprises:
The reconstruction marking described band in the bitmap bitmap of RAID completes.
4. method according to claim 1, is characterized in that, the data of the described band of described reading, comprising:
Structure reads the data that IO reads described band.
5. method according to claim 1, is characterized in that, the described described data configuration according to reading also writes the data needing the dish rebuild, and comprising:
According to the described data configuration call back function read, described data write is needed the dish rebuild.
6. based on a reconstructing device for RAID algorithm, it is characterized in that, described device comprises:
Read through model, for when carrying out data reconstruction, obtaining and needing the bar of the band rebuild locking, reading the data of described band;
Writing module, for writing according to the described data configuration read the data of dish needing to rebuild.
7. device according to claim 6, is characterized in that, described device also comprises:
Determination module, for judging that whether disk array RAID is effective, if effectively, then reads the data of band, otherwise stops rebuilding thread.
8. device according to claim 6, is characterized in that, described device also comprises:
Mark module, completes for the reconstruction marking described band in the bitmap bitmap of RAID.
9. device according to claim 6, is characterized in that, described read through model, specifically for:
Structure reads the data that IO reads described band.
10. device according to claim 6, is characterized in that, described writing module, specifically for:
According to the described data configuration call back function read, described data write is needed the dish rebuild.
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| CN107748650A (en) * | 2017-10-09 | 2018-03-02 | 暨南大学 | Data reconstruction strategy based on lock mechanism in a kind of network code cluster storage system |
| CN108874314A (en) * | 2018-05-31 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of reconstructing method and device of raid-array |
| CN112732167A (en) * | 2019-10-28 | 2021-04-30 | 伊姆西Ip控股有限责任公司 | Method, apparatus and computer program product for managing a storage system |
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