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Logical object data duplication method and related device

A technology of logical objects and replication methods, applied in the storage field, can solve problems such as occupying storage resources, and achieve the effects of saving storage resources, saving processing resources, and reducing the number of read and write operations.

Active Publication Date: 2014-06-25
CHENGDU HUAWEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The inventor found in the process of the present invention that there are at least the following problems in the prior art: when the existing snapshot-based LUN replication technology performs LUN replication, it is necessary to create a disk array for storing the source logical object in the disk array where the source logical object is located. The snapshot volume of the data copy at a certain time will occupy a certain amount of storage resources

Method used

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  • Logical object data duplication method and related device
  • Logical object data duplication method and related device
  • Logical object data duplication method and related device

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Embodiment Construction

[0033] attached figure 1 It is a schematic diagram of the principle of implementing LUN replication based on the current snapshot method. Wherein, the source logical object is a source volume (P-Vol, Primary Volume) located in the primary array (Primary Site), and the target logical object is a secondary volume (S-Vol, Secondary Volume) located in the secondary array (Secondary Site). The basic process of LUN replication is: when preparing to start LUN replication, create a snapshot volume (SnapVol) on the primary array. During the entire LUN replication process, you can continue to perform data modification operations such as writing operations on the source volume. Volume to provide a data copy of the source volume at a certain time; then through the communication link between the primary array and the secondary array, the data copy saved on the snapshot volume is copied to the secondary volume, thereby completing the sequential LUN replication process.

[0034] The snapsho...

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Abstract

The invention discloses a logical object data duplication method and a related device, which are used for reducing storage resources consumed when performing logical unit number duplication. The method comprises the following steps of: acquiring a difference bitmap, wherein the difference bitmap is used for storing corresponding state information that whether each data block in a source logical object is duplicated to a target logical object; monitoring whether a write request for modifying the data block in the source logical object is received; and if the monitoring result is that the write request is not received, determining the data block, not duplicated to the target logical object, in the source logical object according to the difference bitmap, duplicating the data block to the target logical object, and updating the state information of the data block in the difference bitmap.

Description

technical field [0001] The invention relates to the technical field of storage, in particular to a method for duplicating logical object data and a device for duplicating logical object data. Background technique [0002] In order to facilitate the management of more and more devices or objects, the prior art proposes the concept of a Logical Unit Number (LUN, Logical Unit Number). The storage system assigns a logical unit identifier (LUN ID) to each object that needs to be described, so as to expand the original object that can only describe the devices attached to the Small Computer System Interface (SCSI, Small Computer System Interface) bus Identification (Target ID). A LUN ID is not equivalent to a physical device. The object described by it can be a device such as a tape drive or a virtual object such as disk space. [0003] A typical application of LUN ID is to divide the disk space of the disk array into several small storage resource units (disk drives), and each ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14
Inventor 王飞欧阳戟
Owner CHENGDU HUAWEI TECH
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