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Synchronous data prefetching method for logical volume data

A technology of data prefetching and logical volume, which is applied in electrical digital data processing, special data processing applications, and redundant data error detection in computing, etc. and other problems, to achieve the effect of reducing synchronization time and strong versatility

Inactive Publication Date: 2010-09-08
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the data of the source volume and the target volume are inconsistent or the data of the source volume is damaged after the system has been running for a period of time, it is necessary to quickly synchronize the data of the source volume and the target volume to make them reach a consistent state again. The problem of fast comparison of source and destination data

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  • Synchronous data prefetching method for logical volume data
  • Synchronous data prefetching method for logical volume data
  • Synchronous data prefetching method for logical volume data

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Embodiment Construction

[0024] The method for caching and effectively organizing the changed data locally in the case of a temporary abnormality of the remote backup device proposed by the present invention is further described in conjunction with the accompanying drawings and embodiments as follows:

[0025] In the present invention, the data prefetching process at the source volume end is as follows: figure 1 shown, including the following steps:

[0026] (11) The data prefetching thread reads out valid data blocks from the local logical volume according to the bitmap usage information of the logical volume, and writes them into the data buffer pool;

[0027] (12) The characteristic value calculation thread is responsible for calculating the characteristics of the data blocks in the buffer pool, and filling the characteristic value information into the characteristic value list;

[0028] (13) The opposite end characteristic value receiving thread receives the characteristic value information trans...

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Abstract

The invention belongs to the technical field of computer data storage, and mainly solves the problems that when the data a source volume and a target volume in a continuous data protection system is inconsistent, the data of the source volume and the target volume is quickly synchronized, so that the data becomes consistent again, so as to prefect the data. The invention aims to solve problems that when the data of the source volume and the target volume is inconsistent or the data of the source volume is damaged after the system runs for a period of time, the data of the source volume and the target volume needs to be quickly synchronized so as to become consistent again, and the data of a source end and a target end is quickly compared. The synchronous data pre-fetching method for logical volume data is applicable to a logic volume level continuous data protection system, quickly searches inconsistent data blocks when the system needs synchronous data, and transmits the data blocks to the other end via a network. During the logic volume level data synchronization and recovery processes, the operation steps of the source volume end mainly comprise: (1) data pre-fetching; (2) eigenvalue calculation; (3) receiving of the eigenvalue of the end; and (4) different data transmission and the like.

Description

technical field [0001] The invention belongs to the technical field of computer data storage, and mainly solves the problem of quickly synchronizing the data of the source volume and the destination volume when the data of the source volume and the destination volume are inconsistent in a continuous data protection system, so as to perform data prefetching when the data are consistent again. Background technique [0002] Nowadays, computers are becoming more and more important to individuals, enterprises and governments, especially important data stored in computers. Once these data are lost or destroyed, the loss will be difficult to estimate. Existing data protection technologies, such as RAID , remote mirroring, volume shadow copy service, snapshot, etc., can be divided into physical block level, logical volume level, file level or application level from the implementation level. Among them, data protection at the logical volume level has the advantages of being independe...

Claims

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Application Information

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IPC IPC(8): G06F11/14G06F17/30
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