A Fault Tolerant Method of Highly Reliable Disk Array

Abstract

The invention discloses a fault-tolerance method for a high-reliability disk array. The fault-tolerance method comprises the following steps: when a data write error occurs, confirming storage space of a disk in which data with the write error is, and carrying out bad block marking on the storage space; when a data read error occurs, judging if the disk array is complete, if so, working out current position data by checking, writing the data in a corresponding position of the disk, and otherwise, carrying out bad block marking on the storage space with the data read error; and when a next write operation is carried out, carrying out the write operation on the storage space subjected to bad block marking, if the storage space is successfully written and the subsequent read operation is also successful, removing a bad block mark of the storage space, and on the contrary, remaining the bad block mark. According to the fault-tolerance method, the technical problems that only bad block information of read-write errors is recorded and bad blocks are not repaired in a disk array system and the disk array system is limited by a fault-tolerance range in the prior art are solved; and the fault-tolerance method is in particular suitable for occasions with low data accuracy requirements.

Description

technical field [0001] The invention relates to the field of storage, in particular to a fault-tolerant method in a disk array system. Background technique [0002] RAID (Redundant Arrays of Inexpensive Disks) refers to a cheap and redundant disk array. It is a large-capacity disk group composed of many cheap, small-capacity, and high-stability disks. RAID has a certain fault-tolerant capability. When any one of the disks fails, data can still be read out. When data is reconstructed, the data is recalculated and placed in a new disk. RAID technology mainly includes several specifications such as RAID 0 to RAID 7, and their emphases are different. Both RAID5 and RAID6 have certain error handling strategies, which can calculate the data where errors occur through stripe verification. When a disk read error occurs, RAID will perform data write-back repair through verification, which can reduce the possibility of another error. When a disk write error occurs, RAID itself does...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that when a read / write error occurs on the disk, only the number of data blocks with read / write errors is recorded. Even if the read / write error is not caused by the damage of the internal sectors of the disk, the read / write error is still recorded. It will not be repaired. When the number exceeds the fault tolerance limit of the disk array, it will not be able to continue to write data, and when the data blocks marked with read and write errors on a stripe of the disk array exceed the fault tolerance range of the disk array, such as the fault tolerance of RAID5 The range is 1, and the fault tolerance range of RAID6 is 2, and the disk array cannot continue to read and write.

Therefore, this solution cannot reduce the degree of damage to the disk array, and cannot identify read and write errors that are not caused by damage to the disk itself. At the same time, it is difficult for the disk array to achieve high reliability.

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