Patents by Inventor Tohiyuki Ukai

Tohiyuki Ukai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Allocation method of physical regions of a disc array to a plurality of logically-sequential data, adapted for increased parallel access to data
    Patent number: 5809516
    Abstract: Logical blocks are allocated to a plurality of logically sequential blocks of data by referring to disc array configuration information and a list of candidate logical blocks that may be allocated, so that the drives for retaining the logical blocks assigned to the blocks of data and the drives for holding the parities for these logical blocks will be all different. Thus, a total number of drives which operate in parallel for executing sequential writes to the disc array can be increased to a maximum extent.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: September 15, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Tohiyuki Ukai, Toyohiko Kagimasa, Toshiaki Mori, Masaaki Shimizu