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Method for memorizing snapshot data and system for memorizing snapshot

A snapshot and data technology, the redundancy applied in the operation is used for data error detection, response error generation, input/output to the record carrier, etc. It can solve the problem of useless data or constant data occupying storage space, etc., to save The effect of storage space

Active Publication Date: 2012-07-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for storing snapshot data and a system for storing snapshots, which solves the problem of storing useless data or constant data occupying storage space in snapshots

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  • Method for memorizing snapshot data and system for memorizing snapshot
  • Method for memorizing snapshot data and system for memorizing snapshot
  • Method for memorizing snapshot data and system for memorizing snapshot

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0060] The main idea of ​​the present invention is: the storage snapshot system treats part of useless data or constant data on the source logical volume differently. When copying snapshot data, if the useless data or constant data blocks are not physically copied, they are only marked, which can save Storage space for snapshots.

[0061] Part of the data in the source logical volume is useless data or constant data blocks. After taking a snapshot, it does not need to be saved in the snapshot logical volume. After the source logical volume is created (whether a snapshot is created or not), write data on the source logical volume is recorded. When a write request is made, the write request is first divided into blocks according to the size of the data block, and then written to the source logical volume, and the write status is stored in a writ...

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Abstract

The invention discloses a method for memorizing snapshot data and a system for memorizing snapshot. The method comprises the steps: a memory snapshot system snapshoots data on snapshot source logical volume; the memory snapshot system judges that if the data is useless data or constant data block, the data is not copied; wherein the memory snapshot system distinguishes the useless data from the constant data block on the source logical volume according to a write mark table; and wherein the write mark table is used for recording the condition of write data. The invention solves the problem ofoccupying memory space caused by memorizing the useless data or the constant data block in the snapshot.

Description

technical field [0001] The invention relates to the technical field of disk arrays, in particular to a method for storing snapshot data and a system for storing snapshots. Background technique [0002] In the digital age, companies are increasingly storing business-critical data electronically. In the event of file loss, data corruption, or user misuse, recovery must be simple and fast. Snapshot technology provides a solution for this, facilitating data backup. [0003] SNIA (Storage Network Industry Association) defines a snapshot as: a fully available copy of a specified data set, which includes an image of the corresponding data at a certain point in time (the point in time when the copy starts). [0004] In this snapshot method, the logical volume for reading and writing is called a source logical volume, and the auxiliary logical volume that realizes the snapshot addition of the source logical volume is called a snapshot logical volume. Differential replication is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14G06F3/06
Inventor 陈韵霞谭海棠
Owner ZTE CORP