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Snapshot system and method of use thereof

A snapshot and physical device technology, applied in special data processing applications, generation of response errors, instruments, etc., can solve the problems of lack of generality and single snapshot technology, and achieve the effect of good scalability and storage space saving

Inactive Publication Date: 2008-05-21
TIANJIN ZHONGKE BLUEWHALE INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the purpose of the present invention is to overcome the defect that the snapshot technology adopted by the existing snapshot products is single and does not have versatility, thereby providing a snapshot system capable of supporting both COW and ROW snapshot technologies

Method used

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  • Snapshot system and method of use thereof
  • Snapshot system and method of use thereof

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Embodiment Construction

[0071] The snapshot system of the present invention will be described below with reference to the accompanying drawings and specific embodiments.

[0072] Before the present invention is described in detail, at first carry out relevant description to the definition of part noun involved in the present invention:

[0073] Logical device: The device created by the snapshot system of the present invention is called a logical device, which is divided into two types: snapshot device and source device.

[0074] Physical device: the underlying device used by logical devices, and the device used to store data is called a physical device.

[0075] Metadata device: The physical device that stores metadata is called a metadata device.

[0076] Data device: The physical device that stores user data is called a data device

[0077] Zero device: is a virtual device that returns zero data when read.

[0078] Data block: The minimum granularity of I / O request access, generally 4K bytes.

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Abstract

The invention provides a snapshot system, comprising an equipment managing tool set, a snapshot realization module and a physical device. The invention is characterized in that the snapshot realization module comprises a snapshot mechanism layer used for data research and time point management, and a physical resource management layer used for distribution and recovery management of the physical device; the snapshot mechanism layer comprises at least one snapshot group, and different snapshot groups can employ different snapshot technologies; the physical resource management layer comprises a metadata equipment and a data equipment corresponding with the snapshot group. The invention has an advantage that the invention can support two snapshot technologies of COW and ROW, thus users can flexibly select one snapshot technology depending on actual demands.

Description

technical field [0001] The invention relates to the field of data protection, and relates to a snapshot system and a using method thereof. Background technique [0002] Snapshot is a static set generated for source data, which is widely used in data backup, data mining and other fields. According to different implementation technologies, snapshots can be divided into: split mirror (SplitMirror), copy on write (COW: Copy On Write), redirect on write (ROW: Redirect onWrite) and write anywhere (WA: Write Anywhere). At present, the latter three types of technologies are the mainstream snapshot technologies, among which ROW and WA technologies are basically the same, but differ in the organization of data. ROW uses a snapshot space that is isolated from the data space and is used to store snapshot data. When the source data is updated, new data is written to the snapshot space. WA does not reserve snapshot space, and snapshot data and source data share the same physical space a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06F11/14
Inventor 柯剑朱旭东许金萍那文武
Owner TIANJIN ZHONGKE BLUEWHALE INFORMATION TECH
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