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Multi-target, point-in-time-copy architecture with data deduplication

Inactive Publication Date: 2012-09-13
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]FIG. 7 is a flow diagram showing one embodiment of a method for finding a higher source (HS) volume in response to a read to a volume;
[0017]FIG. 8 is a flow diagram showing one embodiment of a method

Problems solved by technology

This can make a write to a source volume very slow.
For this reason, current Flash Copy implementations typically only allow a limited number of targets in a multi-target configuration to keep the performance impact within an acceptable range.

Method used

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  • Multi-target, point-in-time-copy architecture with data deduplication
  • Multi-target, point-in-time-copy architecture with data deduplication
  • Multi-target, point-in-time-copy architecture with data deduplication

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Embodiment Construction

[0020]It will be readily understood that the components of the present invention, as generally described and illustrated in the Figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following more detailed description of the embodiments of the invention, as represented in the Figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of certain examples of presently contemplated embodiments in accordance with the invention. The presently described embodiments will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout.

[0021]As will be appreciated by one skilled in the art, the present invention may be embodied as an apparatus, system, method, or computer program product. Furthermore, the present invention may take the form of a hardware embodiment, a software embodiment (including firmware, resident software, micro-code, etc.) configur...

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Abstract

A method for performing a write to a source volume in a multi-target architecture is described. The multi-target architecture includes a source volume and multiple target volumes mapped thereto. In one embodiment, such a method includes copying data in a track of the source volume to a corresponding track of a target volume (target x). The method enables one or more sibling target volumes (siblings) mapped to the source volume to inherit the data from the target x. When the data is successfully copied to the target x, the method performs a write to the track of the source volume. Other methods for reading and writing data to volumes in the multi-target architecture are also described.

Description

FIELD OF THE INVENTION[0001]This invention relates to data replication, and more particularly to apparatus and methods for creating point-in-time copies of data while minimizing data duplication.BACKGROUND OF THE INVENTION[0002]Data replication functions such as IBM's Flash Copy, Hitachi's Shadowlmage, or the like, may be used to generate nearly instantaneous point-in-time copies of logical volumes or data sets. Among other uses, these point-in-time copies may be used for disaster recovery and business continuity purposes. IBM's Flash Copy in particular creates a point-in-time copy by establishing a relationship (or “mapping”) between a source volume and a target volume. Once this relationship is established, data may be read from either the source volume or target volume. A target bit map associated with a target volume keeps track of which data tracks have actually been copied from the source volume to the target volume. In certain cases, volumes may be arranged in a cascaded conf...

Claims

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Application Information

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IPC IPC(8): G06F12/16
CPCG06F3/061G06F3/0683G06F3/065G06F3/0641
Inventor BENHASE, MICHAEL T.BROWN, THERESA M.GUPTA, LOKESH M.MELLGREN, CAROL S.
Owner IBM CORP