News Column

Patent Issued for File Level Hierarchical Storage Management System, Method, and Apparatus

July 1, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Hitachi, Ltd. (Tokyo, JP) has been issued patent number 8756199, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Sutoh, Atsushi (Yokohama, JP); Takata, Masanori (Yokohama, JP); Kamei, Hitoshi (Sagamihara, JP); Takaoka, Nobumitsu (Sagamihara, JP); Nakano, Takahiro (Yokohama, JP); Shimada, Akio (Yokohama, JP).

This patent was filed on March 1, 2010 and was published online on June 17, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "An apparatus called a NAS (Network Attached Storage) or a file server is generally used in order to store files for multiple client computers (hereinafter simply referred to as the 'clients'). The file server stores files created by the clients by reading data from or writing data to a storage system which can be accessed in units of blocks.

"Furthermore, recently, while the necessity to store a considerable amount of files is growing, there is a demand for the reduction of a unit price per storage capacity. Patent Literature 1 discloses a technology of migrating files that are stored in a high-speed storage apparatus and have not been accessed for a certain amount of time, to a low-speed storage apparatus without changing a method of access from clients where the high-speed storage apparatus and the low-speed storage apparatus are coupled to a controller capable of processing file-level read and write (which corresponds to the above-mentioned file server). This technology is hereinafter referred to as the 'file level hierarchical storage management technology.'"

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "Technical Problem

"Regarding the technique disclosed in Patent Literature 1, it is necessary to refer to update dates and times or reference dates and times for all the files managed by the controller in order to select files to be migrated. Therefore, if the file server manages a considerable amount of files, it takes a long time to select the files to be migrated.

"It is an object of this invention to shorten the time for determining files to be migrated.

"Solution to Problem

"A file service system coupled to a storage system for providing a first storage region and a second storage region according to this invention stores an identifier of a file that has been accessed by a client, in accessed file identifier information and determines the file(s) to be migrated from the first storage region to the second storage region based on metadata of the files stored in the first storage region and the accessed file identifier information.

"Advantageous Effects of Invention

"According to this invention, it is possible to shorten the time for determining the file(s) to be migrated by a file server or a computer coupled to the file server, which uses the file level hierarchical storage management technology."

For the URL and additional information on this patent, see: Sutoh, Atsushi; Takata, Masanori; Kamei, Hitoshi; Takaoka, Nobumitsu; Nakano, Takahiro; Shimada, Akio. File Level Hierarchical Storage Management System, Method, and Apparatus. U.S. Patent Number 8756199, filed March 1, 2010, and published online on June 17, 2014. Patent URL:

Keywords for this news article include: Technology, Hitachi Ltd..

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Source: Journal of Technology

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