Fast disc incremental backup method

A technology of incremental backup and disk, which is applied in response to error generation, error detection of redundant data in calculation, input/output to record carrier, etc. It can solve the problem of long writing time of frozen system, system stuck, etc. problem, achieve the effect of reducing the impact of normal operation, speeding up the comparison speed, and reducing the writing time of the continuous freezing system

Active Publication Date: 2011-09-14
CHENGDU YIWO TECH DEV CO LTD
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is aimed at the shortcomings of the above-mentioned incremental backup technology, especially for the incremental bac

Method used

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Examples

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Example Embodiment

[0044] Example

[0045] The system hierarchy of this example is as follows figure 1 Shown. It should be noted that there is a bitmap in the backup program 103 and a bitmap in the volume filter driver 202 or the disk filter driver 204. The modules involved in the backup program are the backup program 103, and the volume filter driver 202 or the disk filter driver 204.

[0046] figure 2 Describe the main process of backup. First, the backup program 103 generates a full bitmap, and then sends the full bitmap to the volume filter driver 202 or the disk filter driver 204. The volume filter driver 202 or the disk filter driver 204 (hereinafter referred to as the filter driver) refreshes the cache first, freezes all write operations from the file system, and saves the full bitmap. If it is NTFS, the location of the MFT table needs to be recorded. Then unfreeze all write operations from the file system. Release the full bitmap in the backup program. By reading and analyzing the FileR...

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Abstract

The invention relates to the data backup technology, and discloses a fast incremental backup method aiming at the problems that the incremental backup method in the prior art is too long in freezing system written time and is easy to cause system jamming. The incremental backup method places the generation bitmap and the comparison bitmap outside the written time of freezing and unfreezing system, greatly reduces the written time of continuous freezing system, and relieves the influence on the normal operation of the users. The method generates the bitmap needing incremental backup directly by comparing the hash value of file description, namely the file description different from the file description in images should be backup. The method adopts the comparison mode for incremental backup, does not need continuous monitoring rolls or sectionalized change, and can avoid the problem caused by discontinuous monitoring under abnormal condition. The fast incremental backup method is mainlyused for disc data incremental backup, especially suitable for the data incremental backup in NTFS system.

Description

technical field [0001] The invention relates to a data backup technology, in particular to a disk incremental backup technology in a computer system. Background technique [0002] Data backup is an important part of data management and is of great significance to data recovery. Incremental backup is to back up all disk data that has changed since the last backup. The current disk incremental backup has the following methods: [0003] One method of disk incremental backup is to use the monitor volume method. After fully backing up the entire selected target volume, use the volume or disk filter driver to monitor the set of target volumes. If there is any modification, mark it on the corresponding bitmap; the next time you back up, use the marked bitmap to back up the target Partition or disk data. To implement volume or disk monitoring, it is necessary to ensure continuous monitoring during the period from the last backup to the start of this backup. If the monitoring is ...

Claims

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Application Information

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IPC IPC(8): G06F11/14G06F3/06
Inventor 陈克洪
Owner CHENGDU YIWO TECH DEV CO LTD
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