Selective mirroring method

A selective and mirroring technology, applied in the field of selective mirroring, can solve problems such as wasting time and cost, and users cannot reconfigure, so as to achieve the effect of improving data stability and user convenience
CN101883135AInactive Publication Date: 2010-11-10HITACHI LG DATA STORAGE KOREA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI LG DATA STORAGE KOREA
Publication Date
2010-11-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A selective mirroring method is disclosed. In the selective mirroring, first mirroring to duplicate an input / output for a first directory or a file at a time point when the input / output occurs and second mirroring to mirror a second directory or file at a necessary time point may be performed cooperatively or selectively. The selective mirroring may be performed in a kernel layer of the OS. The first mirroring may be performed through hooking of a file I / O system call. The second mirroring may be implemented by a daemon. The second mirroring may be performed when the directory is to be entirely mirrored, when an error occurs in the course of mirroring, or when mirroring is to be performed on a medium to which the first mirroring is hardly applied. The second mirroring may wake up from a sleep state at a time point when mirroring is required to perform a given operation.
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Description

[0001] Cross References to Related Applications

[0002] This application claims priority from Patent Application No. 10-2009-0039190 filed in Korea on May 6, 2009, the entire contents of which are hereby incorporated by reference. technical field

[0003] The present application relates to a selective mirroring method for efficiently implementing a Redundant Array of Inexpensive Disks (RAID) function in a Network Attached Storage (NAS) system. Background technique

[0004] As is well known, RAID is a technique for redundantly storing data in several storage devices such as hard disks, thereby improving the reliability or overall performance of the storage devices.

[0005] RAID is operated based on storage media, partitions, etc. having a fixed size, and RAID in NAS is also operated based on hard disks having a substantially fixed size. Therefore, it is difficult for the user to freely change the storage size or the RAID method (level). For example, if figure 1 As shown,...

Claims

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