Patents by Inventor Claus Mikkelsen

Claus Mikkelsen 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).

  • Method and apparatus for replicating volumes
    Patent number: 7318133
    Abstract: A method for operating a storage system includes providing a primary storage device and a secondary storage device. Data from a first storage volume is copied to a second storage volume using an internal mirror operation, the first and second storage volumes being provided within the primary storage device. The data received from the first volume is copied from the second storage volume to a third storage volume using a remote copy operation, the third storage volume being provided in the secondary storage device. The second storage volume is used for the remote copying to reduce the IO impact on the first volume. The third storage volume copies the data received from the second volume to a fourth storage volume using an internal mirror operation, the fourth storage volume being provided within the secondary storage device.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: January 8, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yuichi Yagawa, Naoki Watanabe, Claus Mikkelsen
  • Method and apparatus for replicating volumes
    Publication number: 20040250034
    Abstract: A method for operating a storage system includes providing a primary storage device and a secondary storage device. Data from a first storage volume is copied to a second storage volume using an internal mirror operation, the first and second storage volumes being provided within the primary storage device. The data received from the first volume is copied from the second storage volume to a third storage volume using a remote copy operation, the third storage volume being provided in the secondary storage device. The second storage volume is used for the remote copying to reduce the IO impact on the first volume. The third storage volume copies the data received from the second volume to a fourth storage volume using an internal mirror operation, the fourth storage volume being provided within the secondary storage device.
    Type: Application
    Filed: March 4, 2004
    Publication date: December 9, 2004
    Applicants: Hitachi, Ltd., Hitachi Data Systems Corporation
    Inventors: Yuichi Yagawa, Naoki Watanabe, Claus Mikkelsen