CN101840311A - Self-repairing method suitable for RAID system and RAID system - Google Patents
Self-repairing method suitable for RAID system and RAID system Download PDFInfo
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- CN101840311A CN101840311A CN200910244156A CN200910244156A CN101840311A CN 101840311 A CN101840311 A CN 101840311A CN 200910244156 A CN200910244156 A CN 200910244156A CN 200910244156 A CN200910244156 A CN 200910244156A CN 101840311 A CN101840311 A CN 101840311A
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Abstract
The invention discloses a self-repairing method suitable for a redundant array of independent disks (RAID) system. In the RAID system comprising a plurality of disks, a circuit for controlling each disk to realize independent power off and power on is arranged on a slot interface of each disk. The method of the invention comprises the following steps: A, when a first disk as a member disk in the RAID system can not respond to IO operation, carrying out independent power off treatment on the first disk through the circuit, and then carrying out independent power on treatment on the first disk; and B, judging whether the first disk can respond to the IO operation; if the first disk can respond to the IO operation, finishing self-repairing on the RAID system; and if the first disk can not respond to the IO operation, starting a hot spare disk to reconstruct the RAID system. The invention also discloses an RAID system. The scheme of the invention can avoid using the hot spare disk to carry out reconstructing operation in many cases, thus improving the performance and reliability of the RAID system and saving the disks.
Description
Technical field
The present invention relates to computer memory technical field, particularly (Redundant Array of Independent Disks, RAID) technology relate in particular to the self-repairing method and the RAID system of a kind of RAID of being applicable to system to raid-array.
Background technology
As the basis and the critical component of network store system, RAID with its fast, the characteristics of magnanimity and high reliability and being celebrated.After the RAID technology occurs, very extensive in the application demand of every field such as industry, military affairs, education, also be industrial hot spot to the RAID Study on Technology always.
HotSpare disk is meant the disk of the usefulness of conduct backup under normal circumstances, is not used in data storage; Have only when the generation disk failures causes RAID member to coil inefficacy in the RAID system, RAID member's dish that HotSpare disk replaces inefficacy automatically is used to store data.The process that HotSpare disk replaces RAID member's dish is called the RAID system reconstructing again.The use of HotSpare disk has improved the data security of RAID system, thereby realizes that safety is redundant.The type of HotSpare disk mainly contains following three kinds:
1) distributed HotSpare disk (Distributed Spare)
The scope of application: partial redundance RAID group;
Characteristics: certain RAID group is proprietary; Divide timing just to take the actual physical disk space; Its redundant space is evenly distributed on all disks of this array;
2) special-purpose HotSpare disk (Dedicated Spare)
The scope of application: all redundant RAID groups;
Characteristics: certain RAID group is proprietary; Only just take the actual physical disk space in use; Its redundant space is distributed on the disk of appointment;
3) overall HotSpare disk (Global Spare)
The scope of application: all redundant RAID groups;
Characteristics: all RAID groups are total; Only just take the actual physical disk space in use; Its redundant space is distributed on the disk of appointment.
By adding the data on member's dish that HotSpare disk recovers to lose efficacy, the RAID system reconstructing can recover the data of inefficacy dish from the beginning to the end, and rebuilding after finishing HotSpare disk will become formal member and coil the member who replaces original inefficacy and coil.Like this, the reconstruction function by the RAID system can improve its reliability.
In the prior art, when input and output (IO) request on upper strata can not be coiled response by certain member of RAID system, can think all that generally this member's dish lost efficacy, the RAID system can start process of reconstruction automatically.The reconstruction operation expense of RAID system is big, the cycle is long, influences the performance of normal data I, and generally during rebuilding, if other disk failure is arranged, the RAID system is collapse directly, and then a little less than allowing the RAID system be highly brittle, therefore should avoid starting reconstruction operation as far as possible.
In most cases, the IO on upper strata request can not be coiled response by certain member of RAID system, is not that the disk that coils as this member had really lost efficacy.According to disk producer Seagate corporate statistics, disk can not respond IO when request, and 95% situation is that these situations can make disk still effective by simple reparation operation because the software error of firmware, verification and so on causes; Having only under 5% the situation, is because disk really lost efficacy.Therefore, if under the inreal situation about losing efficacy of disk,, can greatly improve the operation and maintenance cost of RAID system just to RAID system start-up process of reconstruction.
Summary of the invention
In view of this, the objective of the invention is to, propose a kind of self-repairing method and RAID system that is applicable to the RAID system, can avoid unnecessary process of reconstruction, thereby reduce the operation and maintenance cost of RAID system.
A kind of self-repairing method that is applicable to the RAID system that the embodiment of the invention proposes in the RAID system that is made up of a plurality of disks, provides the control disk to realize the circuit of independent upper and lower electricity on each disk groove position interface, and this method comprises the steps:
A, in the time can't responding the IO operation as first disk of member's dish in the described RAID system, by described circuit described first disk is carried out descending separately electric treatment, more described first disk is carried out going up separately electric treatment;
B, judge whether described first disk can respond IO operation, if, then finish automatic reparation to the RAID system, otherwise, start HotSpare disk and rebuild described RAID system.
Preferably, described steps A comprises:
A1, when the IO operation requests is received by the RAID system, judge whether the disk in the RAID system can respond the IO operation, if, then withdraw from this flow process, otherwise first disk in the RAID system can't respond the IO operation, then first disk is carried out descending separately electric treatment, and start the pre-set time interval timer;
A2, described interval timer are overtime, then first disk are gone up electric treatment.
Preferably, describedly described first disk is carried out descending separately electric treatment by described circuit, when more described first disk being carried out going up electric treatment separately, comprise the steps: further to judge whether that the disk to the RAID system carries out write operation, if then the band sequence number of write operation carried out in record;
And, step B is described to judge whether described first disk can respond the result of IO operation for being, further comprise:, will carry out the content recovery stored on the band of the write operation state before the electric treatment under first disk according to the band sequence number of the execution write operation that is write down.
Set in advance band write record array, a band of the corresponding RAID of each element system in the described band write record array;
The band sequence number that write operation carried out in described record comprises:
According to the address and the data length of write order, calculate at least one bar reel number that this write order corresponds to the RAID system, and described at least one bar reel number is recorded in the element of described band write record array.
The described step that sets in advance band write record array comprises: the element initial value in the described band write record array is set to-1.
Described band sequence number according to the execution write operation that is write down comprises to the state that first disk can't respond before the IO operation having carried out the content recovery stored on the band of write operation:
Reading the element value x in the band write record array, is the content on the band of x according to the sequence number of other disks except that first disk in the described RAID system, and the sequence number of reconstruct first disk is the content on the band of x.
The embodiment of the invention also proposes a kind of RAID system, and described RAID system comprises a plurality of disks, and described a plurality of disks comprise at least one HotSpare disk and a plurality of member dish, and described RAID system also comprises:
On each disk groove position interface, provide the control disk to realize the circuit of independent upper and lower electricity;
First judge module, be used to judge whether the disk as member's dish can respond the IO operation, if first disk can't respond the IO operation, then described first disk is carried out descending separately electric treatment by described circuit, more described first disk is carried out going up separately electric treatment;
Second judge module is used to judge described first disk after last electric treatment, whether can respond the IO operation, if not, activates rebuilding module;
Rebuilding module is used for after being activated, and starts HotSpare disk and the execution reconstruction to the RAID system.
Preferably, described first judge module further comprises interval timer;
When described first judge module carries out descending electric treatment separately to described first disk, start described interval timer, when described interval timer is overtime, described first disk is carried out going up separately electric treatment.
Preferably, described RAID system further comprises:
The write operation logging modle, be used for described first disk is being carried out descending separately electric treatment,, judge whether the disk of RAID system is carried out write operation to described first disk is carried out going up separately in the time interval of electric treatment, if then the band sequence number of write operation carried out in record; And,
The content recovery module, be used for after second judge module judges that described first disk can respond the IO operation after last electric treatment, the band sequence number of the execution write operation that is write down according to described write operation logging modle will have been carried out the content recovery stored on the band of the write operation state before the electric treatment under first disk.
As can be seen from the above technical solutions, when disk can't respond IO when operation, at first by electricity down, go up electric treatment this disk repaired, if disk can respond the IO operation after the above-mentioned processing, then need not to carry out the RAID system reconstructing.Further, carry out the band of write operation in recording disc electric down electricity, the power up down, after disk can respond the IO operation, the band that the RAID system is carried out write operation returned to down electricity state before.
The present invention program can't respond upper strata IO request at certain disk of RAID system and design.When the IO request can't respond, can do down electric treatment to corresponding disk, and write operation took place in which band of record RAID system since descending electricity, when powering on once more, if this disk can respond the IO request, the data on other disk of then reconstruct respective strap are to this disk.The present invention program has avoided being regardless of what state, promptly uses HotSpare disk to carry out reconstruction operation arbitrarily, has improved RAID system performance and reliability, and has saved disk.
Description of drawings
The content synoptic diagram of Fig. 1 for writing down in the band write record array of the embodiment of the invention;
Fig. 2 can't respond IO request during the success that powers on from disk, the schematic flow sheet of respective strap recording process when write operation takes place for the embodiment of the invention;
Fig. 3 is the schematic flow sheet of the embodiment of the invention " low-quality disk " repair process.
Embodiment
The RAID system self-repairing method that the present invention program proposes is: provide the control disk to realize the circuit of independent upper and lower electricity on each disk groove position interface of RAID system; When certain disk of RAID system can't respond the IO operation, attempt that at first it is carried out upper and lower electric treatment and repair automatically, if can not achieve the goal, then start HotSpare disk and carry out reconstruction operation.
If can repair disk by upper and lower electric treatment, can't respond IO at disk and operate in the process that this disk re-powers, may carry out write operation (certainly also may all bands all without any write operation) to some band in the RAID system.Carried out the situation of write operation for fear of some band, need in the process of upper and lower electricity, note the band that has carried out write operation, and the content in these bands is recovered.
For making the purpose, technical solutions and advantages of the present invention clearer, the embodiment of the invention is described in further detail below in conjunction with accompanying drawing.
In order to realize embodiment of the invention scheme, defined band write record array a: wtd_stripe_nos[], the initial value of each of this array element is set to-1.Each of this array element is used to write down from certain disk of RAID system and can't responds IO request during the success that powers on, and one of write operation or a plurality of reel numbers continuously took place in the RAID system.After the success that powers on, do the reparation of relevant band according to the content of this array record.
Figure 1 shows that the content synoptic diagram that writes down in the band write record array in the embodiment of the invention.Illustrated among Fig. 1 by a plurality of members and coiled the RAID system that forms, as shown in Figure 1, one or continuous a plurality of bands in the corresponding RAID of each element system in the band write record array are described for convenient, below the corresponding band of element of hypothesis.Element value is-1, and expression is not carried out write operation from the band of this element correspondence during power on of electricity under the RAID system; Element value is not-1, and then element value has represented to take place during power on from following electricity in the RAID system bar reel number of write operation.From band write record array shown in Figure 1 as can be seen, during this RAID system can't respond IO and asks to power on from disk, the 0th to n band had been performed write operation, and other bands are not carried out write operation.
Fig. 2 can't respond IO request during the success that powers on for the embodiment of the invention from disk, and the schematic flow sheet of respective strap recording process specifically comprised the steps: when write operation took place
Step 201: band write record array wtd_stripe_nos is set, and for each element of this array initial value being set is-1.
Step 202: apply for global variable cur_idx, and be initialized as 0 for it.Cur_idx represents the currentElement sequence number of band write record array wtd_stripe_nos.
Step 203: the failure of current I O Request Processing goes to step 204.
Step 204: ask corresponding disk to descend the electricity operation to described IO.
Step 205: judge whether this IO request is write operation, if, execution in step 206, otherwise go to step 207.
Step 206: calculate the corresponding band numbering x of this IO request, and the element of the currentElement sequence number cur_idx correspondence of array wtd_stripe_nos is set to this band number value x
Step 207: to the operation that powers on of described disk, and judge whether disk powers on successfully, if process ends then, otherwise execution in step 208.
Step 208: current reel number added 1, and promptly cur_idx++ handles next IO request, and goes to step 205.
Fig. 3 is the schematic flow sheet of the embodiment of the invention " low-quality disk " repair process, and this flow process comprises the steps:
Step 301: the disk that can't respond IO operation descend the electricity operation, and to the operation that powers on of the disk of electricity down, disk powers on successfully, continuation execution in step 302.
Step 302: judge whether this disk can respond IO request, if execution in step 303 then, otherwise go to step 304.
Step 303: it is 0 that variable cur_idx is set, and execution in step 305 then.
Step 304: this disk can't start the reconstruction flow process of RAID system, and withdraw from this flow process by electric power up reparation down.
Step 305: read band write record array currentElement value, i.e. wtd_stripe_nos[cur_idx]=x;
Step 306: judge whether band write record array currentElement value equals-1, promptly judge whether x==-1, if, the band that shows this element value correspondence can't respond the IO request at disk and not be modified between powering on, need not this band is recovered, and as can be known according to band record flow process shown in Figure 2, element in the band write record array is that order is recorded, the currentElement value is-1, then the element value after the currentElement value is-1, so should withdraw from this flow process in this case; Otherwise execution in step 307.
Step 307: other each disk is read the content that the x band is stored on the RAID system, and come reconstruct " low-quality disk " to go up the content of this band region by described content, with regard to having realized the content recovery of x band storage has been arrived disk electricity state before down like this.
Step 308: judge whether current band is last band, judges promptly whether cur_idx equals predefined maximal value, if, show that then having finished " low-quality disk " repairs, withdraw from this flow process, otherwise execution in step 309.
Step 309: current reel number added 1, and promptly cur_idx++ goes to step 305 then.
The embodiment of the invention has also proposed a kind of RAID system, and described RAID system comprises a plurality of disks, and described a plurality of disks comprise at least one HotSpare disk and a plurality of member dish, and described RAID system comprises:
On each disk groove position interface, provide the control disk to realize the circuit of independent upper and lower electricity;
First judge module, be used to judge whether the disk as member's dish can respond the IO operation, if first disk can't respond the IO operation, then described first disk is carried out descending separately electric treatment by described circuit, more described first disk is carried out going up separately electric treatment;
Second judge module is used to judge described first disk after last electric treatment, whether can respond the IO operation, if not, activates rebuilding module;
Rebuilding module is used for after being activated, and starts HotSpare disk and the execution reconstruction to the RAID system.
Preferably, described first judge module further comprises interval timer;
When described first judge module carries out descending electric treatment separately to described first disk, start described interval timer, when described interval timer is overtime, described first disk is carried out going up separately electric treatment.
Preferably, described RAID system further comprises:
The write operation logging modle, be used for described first disk is being carried out descending separately electric treatment,, judge whether the disk of RAID system is carried out write operation to described first disk is carried out going up separately in the time interval of electric treatment, if then the band sequence number of write operation carried out in record; And,
The content recovery module, be used for after second judge module judges that described first disk can respond the IO operation after last electric treatment, the band sequence number of the execution write operation that is write down according to described write operation logging modle will have been carried out the content recovery stored on the band of the write operation state before the electric treatment under first disk.
The present invention program has following technique effect:
1, in most of the cases, just can repair disk by the present invention program, and need not to carry out the RAID system reconstructing, not only avoided the unnecessary waste of disk, and with respect to the RAID system reconstructing, the upper and lower electricity of the disk of RAID system is simple to operate, and control makes things convenient for manyly.
2, when certain disk of RAID system can't respond the IO operation, immediately it is carried out upper and lower electricity operation, whole process is very of short duration, has only band few in number that write operation can take place during this.Write down these bands, and repair corresponding zone above them, very little to the consumption of system.
3, in most cases, not to make it can't respond the IO operation because of real inefficacy of disk.The present invention program has avoided these arbitrarily disk to be carried out reconstruction operation in most cases, and and then has avoided the influence of reconstruction operation to the IO of RAID system Performance And Reliability.
4, this method logic and realization are simple, but act on huge.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. self-repairing method that is applicable to raid-array RAID system, it is characterized in that, in the RAID system that forms by a plurality of disks, on each disk groove position interface, provide the control disk to realize the circuit of independent upper and lower electricity, this method comprises the steps:
A, in the time can't responding the IO operation as first disk of member's dish in the described RAID system, by described circuit described first disk is carried out descending separately electric treatment, more described first disk is carried out going up separately electric treatment;
B, judge whether described first disk can respond IO operation, if, then finish automatic reparation to the RAID system, otherwise, start HotSpare disk and rebuild described RAID system.
2. method according to claim 1 is characterized in that, described steps A comprises:
A1, when the IO operation requests is received by the RAID system, judge whether the disk in the RAID system can respond the IO operation, if, then withdraw from this flow process, otherwise first disk in the RAID system can't respond the IO operation, then first disk is carried out descending separately electric treatment, and start the pre-set time interval timer;
A2, described interval timer are overtime, then first disk are gone up electric treatment.
3. method according to claim 1, it is characterized in that, describedly described first disk is carried out descending separately electric treatment by described circuit, when more described first disk being carried out going up electric treatment separately, comprise the steps: further to judge whether that the disk to the RAID system carries out write operation, if then the band sequence number of write operation carried out in record;
And, step B is described to judge whether described first disk can respond the result of IO operation for being, further comprise:, will carry out the content recovery stored on the band of the write operation state before the electric treatment under first disk according to the band sequence number of the execution write operation that is write down.
4. method according to claim 3 is characterized in that, sets in advance band write record array, a band of the corresponding RAID of each element system in the described band write record array;
The band sequence number that write operation carried out in described record comprises:
According to the address and the data length of write order, calculate at least one bar reel number that this write order corresponds to the RAID system, and described at least one bar reel number is recorded in the element of described band write record array.
5. method according to claim 4 is characterized in that, the described step that sets in advance band write record array comprises: the element initial value in the described band write record array is set to-1.
6. method according to claim 4 is characterized in that, described band sequence number according to the execution write operation that is write down comprises to the state that first disk can't respond before the IO operation having carried out the content recovery stored on the band of write operation:
Reading the element value x in the band write record array, is the content on the band of x according to the sequence number of other disks except that first disk in the described RAID system, and the sequence number of reconstruct first disk is the content on the band of x.
7. raid-array RAID system, described RAID system comprises a plurality of disks, and described a plurality of disks comprise at least one HotSpare disk and a plurality of member dish, it is characterized in that, and described RAID system comprises:
On each disk groove position interface, provide the control disk to realize the circuit of independent upper and lower electricity;
First judge module, be used to judge whether the disk as member's dish can respond the IO operation, if first disk can't respond the IO operation, then described first disk is carried out descending separately electric treatment by described circuit, more described first disk is carried out going up separately electric treatment;
Second judge module is used to judge described first disk after last electric treatment, whether can respond the IO operation, if not, activates rebuilding module;
Rebuilding module is used for after being activated, and starts HotSpare disk and the execution reconstruction to the RAID system.
8. RAID according to claim 7 system is characterized in that described first judge module further comprises interval timer;
When described first judge module carries out descending electric treatment separately to described first disk, start described interval timer, when described interval timer is overtime, described first disk is carried out going up separately electric treatment.
9. RAID according to claim 7 system is characterized in that, described RAID system further comprises:
The write operation logging modle, be used for described first disk is being carried out descending separately electric treatment,, judge whether the disk of RAID system is carried out write operation to described first disk is carried out going up separately in the time interval of electric treatment, if then the band sequence number of write operation carried out in record; And,
The content recovery module, be used for after second judge module judges that described first disk can respond the IO operation after last electric treatment, the band sequence number of the execution write operation that is write down according to described write operation logging modle will have been carried out the content recovery stored on the band of the write operation state before the electric treatment under first disk.
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| CN102520880A (en) * | 2011-12-01 | 2012-06-27 | 浪潮电子信息产业股份有限公司 | System raid management module design method |
| CN103019894A (en) * | 2012-12-25 | 2013-04-03 | 创新科存储技术（深圳）有限公司 | Reconstruction method for redundant array of independent disks |
| CN104461791A (en) * | 2014-11-28 | 2015-03-25 | 华为技术有限公司 | Information processing method and device |
| CN105094684A (en) * | 2014-04-24 | 2015-11-25 | 国际商业机器公司 | Reuse method and system for problematic disks in disk array system |
| CN107301106A (en) * | 2017-06-28 | 2017-10-27 | 郑州云海信息技术有限公司 | The restoration methods and device of a kind of RAID system failure |
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| JP2006040044A (en) * | 2004-07-28 | 2006-02-09 | Sony Corp | Data storage device and data storage method therefor |
| JP5022803B2 (en) * | 2006-12-13 | 2012-09-12 | 株式会社日立製作所 | Storage controller |
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| CN102520880A (en) * | 2011-12-01 | 2012-06-27 | 浪潮电子信息产业股份有限公司 | System raid management module design method |
| CN102520880B (en) * | 2011-12-01 | 2014-11-05 | 浪潮电子信息产业股份有限公司 | System raid management module design method |
| CN103019894A (en) * | 2012-12-25 | 2013-04-03 | 创新科存储技术（深圳）有限公司 | Reconstruction method for redundant array of independent disks |
| CN103019894B (en) * | 2012-12-25 | 2015-03-04 | 创新科存储技术（深圳）有限公司 | Reconstruction method for redundant array of independent disks |
| CN105094684B (en) * | 2014-04-24 | 2018-03-09 | 国际商业机器公司 | The method for reusing and system of problem disk in disc array system |
| CN105094684A (en) * | 2014-04-24 | 2015-11-25 | 国际商业机器公司 | Reuse method and system for problematic disks in disk array system |
| CN104461791B (en) * | 2014-11-28 | 2017-02-01 | 华为技术有限公司 | Information processing method and device |
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| CN107301106A (en) * | 2017-06-28 | 2017-10-27 | 郑州云海信息技术有限公司 | The restoration methods and device of a kind of RAID system failure |
| CN109189338A (en) * | 2018-08-27 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of method, system and the equipment of HotSpare disk addition |
| CN109189338B (en) * | 2018-08-27 | 2021-06-18 | 郑州云海信息技术有限公司 | Method, system and equipment for adding hot spare disk |
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