Zero-copy snapshot method

A zero-copy and snapshot technology, applied in the field of network storage, achieves the effect of simple method, low system overhead, and improved overall performance

Active Publication Date: 2012-05-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For the write request of the source volume, the copy-before-write process consumes a lot of time in traversing the snapshot volume and copying data

Method used

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Embodiment Construction

[0036] In order to facilitate the understanding of the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to figure 1 , a schematic diagram of the disk layout. details as follows:

[0038] The data volume used in the invention includes a metadata area and a data area. The metadata area is composed of a plurality of Chunkmaps. Each Chunkmap is responsible for storing the metadata corresponding to a version snapshot. The number of Chunkmaps is consistent with the number of snapshot versions. The metadata in the Chunkmap corresponds to the data in the data area, and the data in the data area can be determined through the metadata. The data area consists of multiple data blocks and is responsible for saving the real data of the user.

[0039] refer to figure 2 , is a schematic diagram of the process of creating a...

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PUM

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Abstract

The invention belongs to the technical field of network storage and discloses a zero-copy snapshot method. Pre-writing copy of data is completely eliminated during source volume write operation, and snapshot metadata copy is avoided by an initialized bitmap method. In the method, difference is not present between source data volume and snapshot volume; a write request is processed by adopting an additional write mode; the current service does not need to pause in the process of creating the snapshot; the speed for creating the snapshot is high; the method is simple; and the system overhead islow.

Description

technical field [0001] The invention belongs to the technical field of network storage. Background technique [0002] With the development of information technology, storage backup disaster recovery technology has become a research hotspot in the field of storage. Due to hackers, viruses, failure of hardware equipment, and natural disasters such as fires and earthquakes, the system and data information will be damaged or even destroyed. If it is not restored in time, it will cause huge losses to the enterprise. Therefore, backup disaster recovery technology appears to be particularly important. [0003] According to the impact degree of backup data on existing applications, it can be divided into offline backup and online backup. Off-line Backup (Off-line Backup) During the backup operation, the server no longer accepts data updates from users or applications. Offline backup can well solve the problem of data integrity during the backup process, and is an effective way to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14
Inventor 刘晓光王刚高岩曹瑞甄彩军徐广治
Owner NANKAI UNIV
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