Terue
Terue Watanabe, Tokyo-To JP
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20090089524 | Storage Device Controlling Apparatus and Method - A storage area, among multiple storage areas, which meets a predetermined requirement is determined to be a target for access. In a controller for controlling a multi-tiered storage subsystem, the following components operate under the control of a file write unit and a file read unit. First, a list acquiring unit obtains a list of tiers that can meet file access requirements. A requisite energy calculating unit calculates an additional energy amount necessary to satisfy file access requirements for each tier, an allowable energy calculating unit calculates an allowable additional energy amount, and a path retrieving unit determines a path to a target tier based on the energy amounts. An identifier acquiring unit obtains a file identifier, and an access point generating unit determines a file access point based on the path and the file identifier. A method for controlling a multi-tiered storage subsystem is also described. | 04-02-2009 |
Terue Watanabe, Yokohama City JP
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20120002317 | WRITING DATA TO TAPE MEDIUM - In a controller of a tape drive, a CM input-output unit recognizes a tape format; a tape variable acquisition unit acquires tape variables; a setting variable acquisition unit acquires setting variables; and a minimum number calculator calculates a minimum number m of sub datasets, which are to be written to a tape to secure resistance to burst error, by using the tape variables and setting variables. When a command processor receives a synchronization command, the buffer manager generates n sub datasets for storing data in the buffer. If n is smaller than m, m sub datasets are padded out and set as write data. If n is m or more, the n sub datasets are set as write data. Then, the channel input-output unit writes the write data to the tape. | 01-05-2012 |
Terue Watanabe, Setagaya-Ku JP
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20150120740 | FILE SYSTEM IMPLEMENTING WRITE ONCE READ MANY (WORM) - The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted. | 04-30-2015 |
20150120741 | FILE SYSTEM IMPLEMENTING WRITE ONCE READ MANY (WORM) - The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted. | 04-30-2015 |