Patents by Inventor Yoshifumi Nakanishi

Yoshifumi Nakanishi 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).

  • Automatic disk mirroring according to workload
    Patent number: 7194575
    Abstract: A disk volume access controlling method includes the steps of setting a threshold number of times of accesses from a computer to a predetermined disk volume per time unit, acquiring a number of times of accesses to the predetermined disk volume per time unit, seeking whether or not the number of times of accesses acquired exceeds the threshold number of times, creating a mirror volume for the predetermined disk volume in case that the number of times of accesses acquired exceeds the threshold number of times, and changing an access pass between the computer and the predetermined disk volume to another access pass between the computer and the newly created mirror volume. It then becomes possible to distribute accesses to a certain disk volume, and further to make the accesses to a plurality of volumes even.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: March 20, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yoshifumi Nakanishi, Nobuo Kawamura, Takashi Itaya
  • Data processing apparatus and disk access control method with data replication for the same
    Publication number: 20050262317
    Abstract: A disk volume access controlling method includes the steps of, setting a threshold number of times of accesses from a computer to a predetermined disk volume per time unit, acquiring a number of times of accesses to the predetermined disk volume per time unit, seeking whether or not the number of times of accesses acquired exceeds the threshold number of times, creating a mirror volume for the predetermined disk volume in case that the number of times of accesses acquired exceeds the threshold number of times, and changing an access pass between the computer and the predetermined disk volume to another access pass between the computer and the mirror volume created. It then becomes possible to distribute accesses to a certain disk volume, and further to make the accesses to a plurality of volumes even.
    Type: Application
    Filed: August 3, 2004
    Publication date: November 24, 2005
    Inventors: Yoshifumi Nakanishi, Nobuo Kawamura, Takashi Itaya