Patent ID: 8103636

Claim:
A file storage system that performs file duplication for error recovery, comprising: a client for requesting generation of a duplicate file of a new file being stored; a metadata server for storing information associated with presorted duplicate files and determining whether a file that is identical to the new file is present among the presorted duplicate files, to limit a number of identical duplicate files to a preset number; and a data server comprising a file duplication unit and a storage unit for respectively performing file duplication and file storage under the control of the metadata server, wherein the metadata server comprises: a file information management unit including a file information management table for storing information associated with files each having duplicate files equal to a preset number, and metafiles including meta-information associated with all of the related files and information associated with the file information management table; and a control unit for generating a metafile in response to the request from the client and inspecting the file information management table to limit a number of identical duplicate files to the preset number.