Magnetic disc data protection method

A data protection and disk technology, applied in the direction of protecting storage content from loss, etc., can solve problems such as sector failure and storage system performance impact

Active Publication Date: 2011-06-01
HUAZHONG UNIV OF SCI & TECH
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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 ine

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[0029] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] The disk data protection method of the present invention involves the following data tables:

[0031] Hot zone linked list: This table records the address and access heat of the sector. Each record consists of 4 data items. Each data item is in order of sector address, access heat, address of the previous record, and address of the next record; if When the application system accesses a certain sector for the first time, it adds a record of the sector to the linked list of the hot zone, and sets the access heat of the sector to 1; if it is not the first access, the record is updated and the sector’s Visit heat plus 1. The access heat refers to the number of times the sector has been accessed in a certain period of time. The length of the period is set by the system administrator and can be one day, one week, one month, or even an infinite time. ...

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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...

Claims

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Application Information

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IPC IPC(8): G06F12/16
Inventor 周可刘军平庞丽萍雷栋梁刘进
Owner HUAZHONG UNIV OF SCI & TECH
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