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Storage system and storage control method

A storage system and virtual storage technology, which can be applied to the generation of response errors, instruments, and digital data processing, etc., and can solve problems such as increased consumption of storage resources.

Inactive Publication Date: 2008-10-01
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the snapshot is used as a copy of the logical volume itself at the time of snapshot acquisition (hereinafter referred to as volume copy), when there are multiple snapshot acquisition times, the same number of volume copies as the number of snapshot acquisition times is required. Increased consumption of resources

Method used

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  • Storage system and storage control method
  • Storage system and storage control method

Examples

Experimental program
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Embodiment Construction

[0043] In one embodiment, the storage system is equipped with a master volume and a copy storage area, the master volume is a logical volume that is updated by writing data elements sent from the host device, and the copy storage area is a copy of the master volume The storage area of ​​the data element before the update. This storage system may have a snapshot management unit, a full backup unit, a differential management unit, and a partial backup unit. The snapshot management unit can manage a plurality of virtual storage locations in a snapshot volume (virtual logical volume) for logically storing a snapshot image of a main volume, and a plurality of actual storage locations (main volume and virtual volume) representing a plurality of data elements constituting a snapshot image. / or copy the location in the storage area) of the correspondence of multiple address information elements. As a full backup, the full backup unit can back up all data elements located in all stor...

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Abstract

The correspondence between a plurality of virtual storage positions in a virtual volume for logically holding a snapshot image of a main volume in which data elements transmitted from a higher-level device are written and a plurality of address information elements indicating a plurality of actual storage positions of a plurality of data elements constituting the snapshot image is managed. In the initial backup, all the data elements stored in all the actual storage positions indicated by a plurality of address information elements are backed up, then storage positions where a difference has occurred between the virtual volume and the backup destination storage device is managed, and in the next and subsequent backups, data elements on the storage positions specified from the address information elements corresponding to the differentially managed storage positions are backed up.

Description

technical field [0001] The invention relates to a technique for data backup. Background technique [0002] For example, according to Patent Document 1, a disk array device updates data after taking a snapshot on an update data storage disk device that is a physically different storage area from a disk device that stores original data. [0003] [Patent Document 1] JP-A-2005-332067 [0004] As one method of backup, there is a method in which a backup server reads data from a backup source storage device and writes the read data into a backup destination storage device. However, in this method, for example, when the backup performance of the backup server is lower than the backup performance of the backup source and / or backup destination storage devices, the backup performance of the backup server becomes a bottleneck. [0005] Also, as one method of backup, it is conceivable to obtain a snapshot of the logical volume at the time of snapshot acquisition and use the snapshot a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14
CPCG06F11/1451G06F2201/84G06F11/1458G06F11/1469
Inventor 天野隆水野阳一
Owner HITACHI LTD