CN102385542B - Method and device for RAID0 data backup - Google Patents
Method and device for RAID0 data backup Download PDFInfo
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- CN102385542B CN102385542B CN 201110416516 CN201110416516A CN102385542B CN 102385542 B CN102385542 B CN 102385542B CN 201110416516 CN201110416516 CN 201110416516 CN 201110416516 A CN201110416516 A CN 201110416516A CN 102385542 B CN102385542 B CN 102385542B
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Abstract
The invention discloses a method and a device for RAID0 data backup, wherein the method is that every disk in RAID0 is detected according to a set method, so as to determine a high-risk disk in RAID0; data with preset size datasize is sequentially read from the high-risk disk, and a read data position read_pos of the high-risk disk is recorded; the data with the size datasize is stored in a backup disk for backup, a write data position write_pos of the high-risk disk is recorded, an the read data position read_pos is moved to the write data position write_pos; and when external data required to be written into the high risk disk, the external data is determined to be written into the high-risk disk or a backup disk according to the position relationship between the position pos where the external data is required to be written and the write_pos and the read_pos+datasize. Compared with the prior art, the method and the device for RAID0 data backup can effectively replace the high-risk disk in RAID0 under the circumstance that the data written into the high-risk disk of RAID0 is not influenced.
Description
Technical field
The present invention relates to data storage technology, particularly a kind of method of RAID0 data backup and device.
Background technology
Raid-array RAID(Redundant Array of Independent Disk) be a kind of polylith independently hard disk (physical hard disk) combine by different modes and form a hard disk groups (logic hard disk), be used for providing memory property and the data backup ability higher than single hard disk.According to the various combination mode of disk array, RAID can be divided into different ranks.RAID rank commonly used has: RAID0, RAID1, RAID2, RAID3, RAID4, RAID5, RAID6, RAID01, RAID10 etc., different RAID ranks are corresponding to different performances, capacity and reliability.
Be that the disk array of RAID0 is the highest disk array of memory property in all RAID ranks for the RAID type, it is distributed to access on a plurality of disks to continuous data, like this, when there is request of data in system, a plurality of disks can be carried out concurrently, and each disk is carried out one's own part request of data.This data parallel operations can take full advantage of the bandwidth of bus, significantly improves the whole access performance of disk.
Fig. 1 is RAID0 data store organisation schematic diagram of the prior art.As shown in Figure 1, RAID0 has comprised 4 blocks of data dishes, and they are respectively Disk1, Disk2, Disk3 and Disk4.As shown in the figure, the I/O request of data that system sends to the RAID0 disk group that four disks form is converted into 4 operations, and wherein each operation is all corresponding to a physical hard disk.By setting up RAID0, the request of data of original order is dispersed in four hard disks and carries out simultaneously, and theoretically, the parallel work-flow of four hard disks makes interior disk read-write speed of same time promote 4 times.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In existing RAID0 date storage method, data redundancy protection can not be provided, if a disk failure among the RAID0 can't recover, thereby affect whole the reliability of the data.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of method of RAID0 data backup, can guarantee effectively to replace the high-risk disk among the RAID0 in the situation that do not affect high-risk disk data writing in the RAID0.
Another object of the present invention is to provide a kind of device of RAID0 data backup, can guarantee effectively to replace the high-risk disk among the RAID0 in the situation that do not affect high-risk disk data writing in the RAID0.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of RAID0 data backup comprises:
According to preordering method each disk among the RAID0 is detected, determine the high-risk disk among the described RAID0;
From the read data position read_pos the described high-risk disk, read successively in order the data of preset length datasize, record the read data position read_pos of described high-risk disk;
Be that the data of datasize backup in the backup diskette with described length, record the write data bits of described high-risk disk and put write_pos, this write data bits is put this read data position of write_pos=read_pos+ preset length datasize; Described read data position read_pos is moved to write data position write_po, thereby form new read data position read_pos_new s;
When needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos_new+datasize, determine described external data is written in described high-risk disk or the described backup diskette, comprising:
When described needs write the position pos of external data＜write_pos, determine described external data is written in the described backup diskette;
Perhaps, when pos 〉=read_pos_new+datasize, determine described external data is written in the described high-risk disk;
Perhaps, when pos 〉=write_pos and pos＜read_pos_new+datasize, determine described external data is written in the described high-risk disk.
A kind of device of RAID0 data backup comprises:
Determining unit is used for detecting according to preordering method each disk to RAID0, determines the high-risk disk among the described RAID0, sends a reading command to reading unit, comprises the unique identification of described high-risk disk in the described reading command;
Described reading unit, be used for after receiving described reading command, from the read data position read_pos the described high-risk disk, read successively in order the data of preset length datasize, recording the read data position read_pos of described high-risk disk, is that the data of datasize send to backup units with described length;
Described backup units backups to backup diskette for the data that with described length are datasize, records the write data bits of described high-risk disk and puts write_pos, and this write data bits is put this read data position of write_pos=read_pos+ preset length datasize; Described read data position read_pos is moved to write data position write_pos, thereby form new read data position read_pos_new; Write data position write_pos and described read data position read_pos_new are sent to described determining unit;
Described determining unit, also be used for when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos_new+datasize, determine described external data is written in described high-risk disk or the described backup diskette; Comprise:
When described needs write the position pos of external data＜write_pos, determine described external data is written in the described backup diskette;
Perhaps, when pos 〉=read_pos_new+datasize, determine described external data is written in the described high-risk disk;
Perhaps, when pos 〉=write_pos and pos＜read_pos_new+datasize, determine described external data is written in the described high-risk disk.
As seen, adopt technical scheme of the present invention, record read data position read_pos and write data bits are put write_pos in the high-risk disk of RAID0, when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos+ preset length datasize, determine described external data is written in described high-risk disk or the described backup diskette.Be compared with existing technology, the method and apparatus of RAID0 data backup provided by the invention can be guaranteed in the situation that do not affect high-risk disk data writing in the RAID0, effectively replace the high-risk disk among the RAID0, in addition, the method for the invention implements simple and convenient, is convenient to popularize.
Description of drawings
Fig. 1 is RAID0 data store organisation schematic diagram of the prior art.
Fig. 2 is the method flow diagram of RAID0 data backup of the present invention.
Fig. 3 is the schematic diagram of the high-risk disk Disk4 of the present invention data back up method.
Fig. 4 is the apparatus structure schematic diagram of RAID0 data backup of the present invention.
Embodiment
For problems of the prior art, the method for the RAID0 data backup after a kind of the improvement is proposed among the present invention, can guarantee effectively to replace the high-risk disk among the RAID0 in the situation that do not affect high-risk disk data writing in the RAID0.
For make technical scheme of the present invention clearer, understand, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
Fig. 2 is the method flow diagram of RAID0 data backup of the present invention.As shown in Figure 2, may further comprise the steps:
In this step, by the hard disk testing tool, for example can be SMART hard disk testing tool, disk Disk1, Disk2, Disk3 and Disk4 among the RAID0 are detected respectively, determine to be among the RAID0 disk of high-risk status.Suppose in this step, by SMART hard disk testing tool each data disks among the RAID0 is detected, determine that disk Disk4 is high-risk disk.
Fig. 3 is the schematic diagram of the high-risk disk Disk4 of the present invention data back up method.As shown in Figure 3, if preset length datasize is 2, at first in order reading out data D4 and D8 from high-risk disk Disk4 record the read data position read_pos of high-risk disk Disk4.
In this step, as shown in Figure 3, data D4 among the high-risk disk Disk4 and D8 are backuped in the backup diskette, record the write data bits of high-risk disk and put write_pos, and read data position read_pos is moved to write data bits put write_pos, at this moment, the read data position read_pos among the high-risk disk Disk4 and write data bits are put write_pos on same position.
In this step, when needs write external data to high-risk disk Disk4, write as required the position pos of external data and the position relationship of write_pos and read_pos+datasize, determine external data is written in high-risk disk Disk4 or the backup diskette.Particularly, when needs write the position pos of external data＜write_pos, determine external data is written in the backup diskette; Perhaps, when pos 〉=read_pos+datasize, determine external data is written among the high-risk disk Disk4; Perhaps, when pos 〉=write_pos and pos＜read_pos+datasize, determine external data is written among the high-risk disk Disk4.
Preferably, when pos 〉=write_pos and pos＜read_pos+datasize, after external data being written to high-risk disk Disk4, can also in high-risk disk Disk4, again read take read_pos as starting point, length is the data of datasize, take read_pos as starting point, length is that the data of datasize backup in the backup diskette with described.
The method of the RAID0 data backup that the present invention proposes, record read data position read_pos and write data bits are put write_pos in the high-risk disk of RAID0, when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos+ preset length datasize, determine described external data is written in described high-risk disk or the described backup diskette.Be compared with existing technology, the method for RAID0 data backup provided by the invention can be guaranteed in the situation that do not affect high-risk disk data writing in the RAID0, effectively replace the high-risk disk among the RAID0, in addition, the method for the invention implements simple and convenient, is convenient to popularize.
Fig. 4 is the apparatus structure schematic diagram of RAID0 data backup of the present invention.As shown in Figure 4, comprising:
Determining unit 401 is used for detecting according to preordering method each disk to RAID0, determines the high-risk disk among the described RAID0, sends a reading command to reading unit 402, comprises the unique identification of described high-risk disk in the described reading command;
Described reading unit 402, be used for after receiving described reading command, from described high-risk disk, read successively in order the data of preset length datasize, recording the read data position read_pos of described high-risk disk, is that the data of datasize send to backup units 403 with described length;
Described backup units 403, backup to backup diskette for the data that with described length are datasize, record the write data bits of described high-risk disk and put write_pos, described read data position read_pos is moved to write data position write_pos, write data position write_pos and write data position read_pos are sent to described determining unit 401;
Described determining unit 401, also be used for when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos+datasize, determine described external data is written in described high-risk disk or the described backup diskette.
Further, described determining unit 401, definitely is written to described external data in the described backup diskette concrete being used for when the position pos that need to write external data＜write_pos;
Perhaps, when pos 〉=read_pos+datasize, determine described external data is written in the described high-risk disk;
Perhaps, when pos 〉=write_pos and pos＜read_pos+datasize, determine described external data is written in the described high-risk disk.
Further, described reading unit 402, also be used for when pos 〉=write_pos and pos＜read_pos+datasize, after described external data is written to described high-risk disk, in described high-risk disk, again read take read_pos as starting point, length is the data of datasize, and take read_pos as starting point, length is that the data of datasize send to described backup units with described;
Described backup units 403 also is used for described take read_pos as starting point, and length is that the data of datasize backup in the described backup diskette.
The device of the RAID0 data backup that the present invention proposes, record read data position read_pos and write data bits are put write_pos in the high-risk disk of RAID0, when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos+ preset length datasize, determine described external data is written in described high-risk disk or the described backup diskette.Be compared with existing technology, the device of RAID0 data backup provided by the invention can be guaranteed in the situation that do not affect high-risk disk data writing in the RAID0, effectively replace the high-risk disk among the RAID0, in addition, the method for the invention implements simple and convenient, is convenient to popularize.
The specific works flow process of device embodiment shown in Figure 4 please refer to the respective description in the embodiment of the method shown in Figure 2, repeats no more.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (4)
1. the method for a RAID0 data backup is characterized in that, comprising:
According to preordering method each disk among the RAID0 is detected, determine the high-risk disk among the described RAID0;
From the read data position read_pos the described high-risk disk, read successively in order the data of preset length datasize, record the read data position read_pos of described high-risk disk;
Be that the data of datasize backup in the backup diskette with described length, record the write data bits of described high-risk disk and put write_pos, this write data bits is put this read data position of write_pos=read_pos+ preset length datasize; Described read data position read_pos is moved to write data position write_pos, thereby form new read data position read_pos_new;
When needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos_new+datasize, determine described external data is written in described high-risk disk or the described backup diskette, comprising:
When described needs write the position pos of external data＜write_pos, determine described external data is written in the described backup diskette;
Perhaps, when pos 〉=read_pos_new+datasize, determine described external data is written in the described high-risk disk;
Perhaps, when pos 〉=write_pos and pos＜read_pos_new+datasize, determine described external data is written in the described high-risk disk.
2. method according to claim 1 is characterized in that,, after determining to be written to described external data in the described high-risk disk, also comprises during as pos 〉=write_pos and pos＜read_pos_new+datasize described:
Again read take read_pos_new as starting point in described high-risk disk, length is the data of datasize;
Take read_pos_new as starting point, length is that the data of datasize backup in the described backup diskette with described.
3. the device of a RAID0 data backup is characterized in that, comprising:
Determining unit is used for detecting according to preordering method each disk to RAID0, determines the high-risk disk among the described RAID0, sends a reading command to reading unit, comprises the unique identification of described high-risk disk in the described reading command;
Described reading unit, be used for after receiving described reading command, from the read data position read_pos the described high-risk disk, read successively in order the data of preset length datasize, recording the read data position read_pos of described high-risk disk, is that the data of datasize send to backup units with described length;
Described backup units backups to backup diskette for the data that with described length are datasize, records the write data bits of described high-risk disk and puts write_pos, and this write data bits is put this read data position of write_pos=read_pos+ preset length datasize; Described read data position read_pos is moved to write data position write_pos, thereby form new read data position read_pos_new; Write data position write_pos and described read data position read_pos_new are sent to described determining unit;
Described determining unit, also be used for when needs write external data to described high-risk disk, write as required the position pos of external data and the position relationship of write_pos and read_pos_new+datasize, determine described external data is written in described high-risk disk or the described backup diskette; Comprise:
When described needs write the position pos of external data＜write_pos, determine described external data is written in the described backup diskette;
Perhaps, when pos 〉=read_pos_new+datasize, determine described external data is written in the described high-risk disk;
Perhaps, when pos 〉=write_pos and pos＜read_pos_new+datasize, determine described external data is written in the described high-risk disk.
4. device according to claim 3, it is characterized in that, described reading unit, also be used for when pos 〉=write_pos and pos＜read_pos_new+datasize, after described external data is written to described high-risk disk, in described high-risk disk, again read take read_pos_new as starting point, length is the data of datasize, take read_pos_new as starting point, length is that the data of datasize send to described backup units with described;
Described backup units also is used for described take read_pos_new as starting point, and length is that the data of datasize backup in the described backup diskette.
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