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Method for snapping magnetic disc using snap index

A disk and pointer technology, applied in the server field, can solve problems such as abnormal operating system crashes

Inactive Publication Date: 2009-06-24
王娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the many problems of the aforementioned existing disk snapshots, the inventor has finally developed and designed a method for disk snapshots using snapshot pointers of the present invention after long-term hard research and experiments. Problems that cause the operating system to crash abnormally

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  • Method for snapping magnetic disc using snap index
  • Method for snapping magnetic disc using snap index
  • Method for snapping magnetic disc using snap index

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The present invention provides a method for performing disk snapshots with snapshot pointers, please refer to figure 1 , 2 As shown, the method is applied in a server 5, and the server 5 includes at least one memory 6 and at least one hard disk 7, wherein the memory 6 plans a kernel space 60 (Kernel Space), when the server 5 hard disk 7 disk When taking a snapshot, follow the steps below:

[0026] Step 1: All the disk blocks (chunks) that the hard disk 7 currently has data are planned as a disk volume 70 (Volume);

[0027] Step 2: plan out the first part 72 and the second part 74 in the hard disk 7, wherein the capacity of the first part 72 is equal to the maximum required capacity of the Copy-On-Write (abbreviation: COW) Table written in synchronous replication, write The synchronous copy comparison table includes a plurality of comparison information, and...

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Abstract

The invention provides a method of disk snapshot with a snapshot pointer. The method is applied to a server, when the server conducts the disk snapshot, all chunks of the hard disk are programmed into a disc volume, moreover, a first part and a second part are programmed in the hard disk, and the snapshot pointer is arranged in a kernel space of a memory, and the snapshot pointer points to the starting position of the first part; when initial data needs to be modified, the initial data is firstly copied to the chunk of the second part as backup data, then, the initial data is modified as modified data, and contrast information is written in a eager replication contrast table; when the server is about to conduct data recovery to the disc volume, the contrast information is read from the eager replication contrast table, the backup data is obtained and covered to corresponding chunk, so that the disc volume is recovered. Through the invention, the problem of abnormal collapse of an operating system caused by the exhaustion of the kernel space can be solved.

Description

technical field [0001] The invention relates to a server, in particular to a method for performing a disk snapshot with a snapshot pointer. Background technique [0002] At present, general operating systems support a disk snapshot (Snapshot) technology, which can also be called volume shadow copy services (Volume Shadow Copy Services). As the general data backup technology needs to copy the action, the disk snapshot is to quickly archive the disk volume of the hard disk (volume refers to the disk block (chunk) of the hard disk) at any point in time System backup, and when taking a disk snapshot, does not involve any file copying action. And the entire directory structure in the data structure of the file system currently in use is preserved. In this way, real-time creation of disk snapshots of disk volumes at different time points on the hard disk can not only make up for the shortcomings of the traditional backup mechanism, but also, even if the hard disk is damaged or p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14G06F17/30
Inventor 陈志伟
Owner 王娟