Patents by Inventor Masayoshi Ohara

Masayoshi Ohara 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).

  • Storage apparatus and its control method
    Patent number: 8832396
    Abstract: A controller for the storage apparatus: creates a second logical volume in a storage area provided by one or more storage devices; stores management information of a snapshot of a first logical volume, which is to be provided to a host computer, in the second logical volume; and reads the management information of a necessary snapshot from the second logical volume to a memory when needed, executes processing using the read management information, and returns the management information, which becomes no longer necessary, from the memory to the second logical volume. When reading the management information of the necessary snapshot from the second logical volume to the memory when needed, the controller changes the number of generations and address range of the snapshot of the management information to be read to the memory according to a generation and address of the snapshot whose management information is required.
    Type: Grant
    Filed: November 25, 2011
    Date of Patent: September 9, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masayoshi Ohara, Koji Nagata, Kosuke Sakai
  • STORAGE APPARATUS AND ITS CONTROL METHOD
    Publication number: 20130138916
    Abstract: A controller for the storage apparatus: creates a second logical volume in a storage area provided by one or more storage devices; stores management information of a snapshot of a first logical volume, which is to be provided to a host computer, in the second logical volume; and reads the management information of a necessary snapshot from the second logical volume to a memory when needed, executes processing using the read management information, and returns the management information, which becomes no longer necessary, from the memory to the second logical volume. When reading the management information of the necessary snapshot from the second logical volume to the memory when needed, the controller changes the number of generations and address range of the snapshot of the management information to be read to the memory according to a generation and address of the snapshot whose management information is required.
    Type: Application
    Filed: November 25, 2011
    Publication date: May 30, 2013
    Applicant: HITACHI, LTD.
    Inventors: Masayoshi Ohara, Koji Nagata, Kosuke Sakai