Patents by Inventor Yumiko Haruma

Yumiko Haruma 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).

  • High-speed snapshot method
    Patent number: 7325112
    Abstract: When a snapshot of data is taken, it is after a write request comes from the host equipment that old data on the source-side magnetic disk to the snapshot-side magnetic disk; therefore, it takes a long time before new data is actually written in the source-side magnetic disk. To overcome this problem, by analyzing data update information, and from a result of analysis, by deciding an area that has high possibility of receiving a request to write data, and having data of that area previously copied to the snapshot-side magnetic disk, it is possible to take a snapshot very quickly.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: January 29, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yumiko Haruma, Koji Sugiyama, Kei Kubo, Yoshihito Yugami, Shinji Morita
  • High-speed snapshot method
    Publication number: 20060236051
    Abstract: When a snapshot of data is taken, it is after a write request comes from the host equipment that old data on the source-side magnetic disk to the snapshot-side magnetic disk; therefore, it takes a long time before new data is actually written in the source-side magnetic disk. To overcome this problem, by analyzing data update information, and from a result of analysis, by deciding an area that has high possibility of receiving a request to write data, and having data of that area previously copied to the snapshot-side magnetic disk, it is possible to take a snapshot very quickly.
    Type: Application
    Filed: June 16, 2006
    Publication date: October 19, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Yumiko Haruma, Koji Sugiyama, Kei Kubo, Yoshihito Yugami, Shinji Morita
  • High-speed snapshot method
    Publication number: 20050033930
    Abstract: When a snapshot of data is taken, it is after a write request comes from the host equipment that old data on the source-side magnetic disk to the snapshot-side magnetic disk; therefore, it takes a long time before new data is actually written in the source-side magnetic disk. To overcome this problem, by analyzing data update information, and from a result of analysis, by deciding an area that has high possibility of receiving a request to write data, and having data of that area previously copied to the snapshot-side magnetic disk, it is possible to take a snapshot very quickly.
    Type: Application
    Filed: January 7, 2004
    Publication date: February 10, 2005
    Applicant: Hitachi, Ltd.
    Inventors: Yumiko Haruma, Koji Sugiyama, Kei Kubo, Yoshihito Yugami, Shinji Morita