US Patent 7185265 Disk array system and its control method

Patent 7185265 was granted and assigned to Hitachi on February, 2007 by the United States Patent and Trademark Office.

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US Patent 11960412 Systems and methods for identifying storage resources that are not in use

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Hitoshi Kakuta0

Yoshifumi Takamoto0

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Patent abstract

In a disk array system of RAID (level 5) improving the system performance by distributing data, duplicated fields are allocated in a parity group in order to reduce an overhead of data write. In the data write process, write data is tentatively and duplicately written in the duplicate fields. At this time, a write completion is reported to CPU. The parity is generated later at a proper timing and written in a SCSI drive. Generating a parity and writing data can be efficiently scheduled.

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