Magnetic disc data protection method

Abstract

The invention discloses a magnetic disc data protection method, which comprises: receiving a magnetic disc operation request, and counting the degree of access heat of a requested vector; when the degree of the access heat of the requested vector meets a hot point requirement, copy is unavailable and the free space of the magnetic disc is greater than a preset free space threshold, generating a copy of the requested vector; and when the data in the requested vector and the data in the copy of the requested vector are consistent during reading and writing operation, selecting a vector which is at the shortest distance to the current position of a magnetic head for operation, or when the data in the requested vector and the data of the copy of the requested vector are inconsistent, selecting the vector with the latest data from the two vectors for operation. When the hot vector or the copy of the hot vector has a fault, data in a mirror sector are used for restoring the failed vector. In the invention, the fault probability of the hot vector is reduced by reducing the reading and writing times of the vector and the reliability of the data in the hot vector is guaranteed; meanwhile, while the system request is responded to, the data at the shortest distance to the magnetic head are fed back, so higher reading and writing performance are provided.

Description

technical field [0001] The invention belongs to the technical field of computer storage, and in particular relates to a disk data protection method for preventing data loss caused by sector failure in a disk or disk array. Background technique [0002] With the continuous decline in hard disk prices, 2TB large-capacity hard disks have become increasingly popular. However, the use of large-capacity hard disks will bring reliability problems, because due to technological reasons, each hard disk has a certain bit error rate. When the bit error rate is fixed, when the capacity of a single disk increases, The probability of potential sector failures on the hard disk will also increase. When a disk failure occurs in a storage system using the RAID technology, the RAID reconstruction thread is called. However, when a sector failure or a potential data corruption failure occurs during the reconstruction process, some data blocks cannot be successfully recovered, so data loss occur...

AI Technical Summary

Problems solved by technology

But this approach also has limitations

One is the performance problem, which is similar to the lowercase problem in RAID5. In the on-disk redundancy scheme, the data write operation for each stripe unit needs to calculate and modify the parity information. Therefore, although the on-disk redundancy scheme can Obtain high reliability, but it inevitably affects the performance of the storage system

Second, reliability issues

Therefore, in the disk redundancy scheme, if there are many write operations, the possibility of failure of the sector storing the verification information will be greatly increased, which will also increase the possibility of failure of the sectors near this sector.

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