Method and device for improving reliability of storage system based on local repair coding

Abstract

The invention discloses a method and device for improving reliability of a storage system based on local repair coding, and belongs to the field of computer storage. The method comprises a predictionadjustment step and a repair regression step, wherein the prediction adjustment step comprises the following operations: predicting a bad disk about to fail, and marking all data blocks in the bad disk as bad blocks; for each bad block Bi, changing the grouping state, so that only the bad block Bi and another data block are reserved in the group Gi to which the bad block Bi belongs, and the rest data blocks are transferred, and the local check block is updated correspondingly; repair regression comprises the steps: executing repair operation; and if the repaired data block B is marked as a badblock, marking the bad block as a good block, and when the data block in the group G is transferred, transferring the transferred data block back to the group G, and correspondingly updating the local check block. According to the method, the degradation reading performance and the data restoration performance of the storage system based on the local restoration coding can be improved, so that the system reliability is improved.

Description

technical field [0001] The invention belongs to the field of computer storage, and more specifically relates to a method and a device for improving the reliability of a storage system based on local repair coding. Background technique [0002] With the rapid development of information technology, the amount of data to be stored is increasing, the scale of the storage system is also increasing, and the application of cheap storage devices is becoming more and more extensive. With the increase of the scale and the increase of the number of cheap disks, the probability of disk failure in the storage system is also increasing, which leads to severe challenges to the reliability of the storage system. In order to ensure the reliability of storage systems, most storage systems use fault-tolerant technology. Replica technology and erasure code technology are two commonly used fault-tolerant systems in storage systems. Copy technology refers to copying the original data and storin...

AI Technical Summary

Problems solved by technology

[0004] Partial repair coding can improve the reliability of the storage system to a certain extent by limiting degraded read operations and data repair operations to one group as much as possible. However, as the storage scale continues to increase, the group size is also large. The degraded read operation and data repair operation still need to read more data blocks / check blocks, so it takes a long time. Since the storage system has a high probability of error during the recovery process, a long operation time will affect the storage system. overall reliability

Therefore, the reliability of the existing storage system based on local repair coding still needs to be further improved

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