Information backup/restoration processing apparatus and information backup/restoration processing system

Abstract

To reduce the size of backup data, increase the backup speed, and solve a problem that the amount of unnecessary writing could undesirably increase in a restoration process, which would otherwise require physical disks with a capacity greater than the size of a virtual volume. On a backup server having mounted thereon a virtual volume that is the target to be backed up and restored, read / write access to only the blocks of data areas is performed by a device driver that filters I / O access to a device from a file system on the basis of the data mapping information of the virtual volume, whereby read / write access to unnecessary portions is avoided. Thus, it is possible to reduce the size of backup data, increase the backup speed, and prevent an increase in the amount of unnecessary writing to the virtual volume in a restoration process.

Description

technical field [0001] The present invention relates to an information backup / restoration processing device and an information backup / restoration processing system, for example, relates to a device and a system for performing backup / restoration processing on logical volumes in units of mirror images. Background technique [0002] In recent years, the digitization of information in enterprises has been advancing, and the amount of electronic data such as document files, image files, and animation files circulating in enterprises has increased rapidly. A large-scale storage for storing such large-scale electronic data is highly required for organizational departments such as data centers and information system departments of companies that store and manage electronic data within the organization. [0003] In general, a storage product installs and manages a plurality of physical disks that can be accessed at high speed, and provides a large-scale storage area. As one function...

AI Technical Summary

Problems solved by technology

Therefore, the excess data other than the allocated part is read as the original data, and there is a problem that the backup time is too long

[0006] Second, in the restoration process of the volume mirror unit, the backup application program writes the backed up mirror data into the target virtualized logical volume, but this writing is also performed sequentially from the first extent to the end of the volume. Extents are written, and the write accesses the previously unallocated area of ​​the physical disk. As long as the physical disk above the logical volume that is actually allocated is not prepared, it cannot be restored.

[0010] However, the method shown in Patent Document 1 relies on the memory system and is closed in the memory

Therefore, it is impossible to determine the utilization area of ​​the disc corresponding to the file format of the OS installed on the host computer. For example, the wreckage data area after the file deletion in the aforementioned NTFS becomes the object of backup / restoration, and the efficiency is not good.

In addition, when restoring (restoring), the backup format must be recognized and restored on the storage side, and there is a problem that restoration cannot be performed in other storage.

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