Method and apparatus for ensuring data reliability during conversion process based on RAID 1 and RAID 4 mixture structure
A conversion process and hybrid structure technology, applied in the direction of input/output to record carrier, etc., can solve the problems of large network bandwidth and disk bandwidth consumption, mutual influence of write I/O operations, and inability to guarantee data consistency, etc., to ensure asynchronous The degree of automation and the effect of ensuring data consistency
Active Publication Date: 2015-11-25
INST OF COMPUTING TECH CHINESE ACAD OF SCI +1
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[0004] In AutoRAID, RAID1 and RAID5 data are stored separately. Migrating a large amount of data from RAID1 to RAID5 in a network environment will bring huge network bandwidth and disk bandwidth consumption, which is not suitable for use in a distributed environment.
However, the RAID5 part of DPGADR is stored in a degraded mode, and the read and write performance of cold data is poor.
The Chinese patent No. 201410033455.3 - "RAID1 and RAID4 mixed structure network storage system and method" proposes a back-end redundant centralized management method to solve the performance bottleneck of the centralized redundant management method, but the data synchronization process and write I The / O operation will affect each other, and the data consistency in the process of converting RAID1 data to RAID4 data cannot be guaranteed.
[0005] Based on the above analysis, the hybrid RAID structure network storage technology still has the following limitations: the data conversion process affects the write I / O operation, and the consistency of data conversion cannot be guaranteed.
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[0034] The following are the concrete steps of the inventive method, as follows:
[0035] The suspending step is to obtain the occupied space value of the BRD in the check node, and when the occupied space value reaches the set threshold, add the area where the BRD is located to the suspend_area list, and convert the area into corresponding multiple data nodes and send a suspend operation request to the subarea, and after receiving the suspend operation request, the data node suspends the write request of the subarea;
[0036] The conversion step is to perform RAID4 verification calculation on the data of the sub-area, write the generated verification data into a logical volume device, and send a remapping request to the data node, and the data node will transfer the data of the sub-area BRD is remapped to ARP to complete the data conversion.
[0037] The conversion step includes: performing RAID4 check calculation on the sub-area that successfully executes the pending operat...
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The invention relates to the computer storage field, and provides a method and an apparatus for ensuring the data reliability during the conversion process based on an RAID and RAID 4 mixture structure, wherein the method comprises: acquiring a space occupation value of an BRD in a check node; adding a domain where the BRD locates to a suspend_area list if the space occupation value is the same with the preset threshold value; converting the domain into a corresponding sub-domain of a plurality of data nodes and sending a suspend operation request to the sub-domain; suspending a write request of the sub-domain after the data nodes receiving the suspense operation request; performing RAID 4 check calculation to the data of the sub-domain; writing the generated check data into a logic volume device and sending a remapping request to the data nodes; and remapping the BRD of the sub-domain to an ARP through the data nodes to finish data conversion. According to the invention, the interact probability between the conversion process from RAID 1 to RAID 4 and I / O operation in a short time is lowered, thus ensuring the asynchronous degree between the conversion process and write operation.
Description
technical field [0001] The invention relates to the field of computer storage, in particular to a data reliability guarantee device for conversion process based on RAID1 and RAID4 hybrid structures. Background technique [0002] RAID (Redundant Array of Independent Disks) technology is a storage method that provides enhanced redundancy, capacity and storage performance, and has strong manageability, reliability and availability. Through redundant computing, RAID technology can reduce system capacity overhead on the premise of meeting reliability requirements. The research on applying RAID technology to network storage systems has experienced from centralized control to distributed control, from single RAID mode to hybrid RAID During the development of the model, RAID1 technology has high reliability. RAID1 mirroring enables two copies of data in write operations. Even if one of the nodes fails, the copy can also guarantee a correct data. RAID4 redundancy technology occupies ...
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IPC IPC(8): G06F3/06
Inventor 贾思懿许鲁董欢庆
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI