Patents by Inventor Shuji Kondou

Shuji Kondou 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 system and storage system management method
    Patent number: 7421550
    Abstract: A storage system secures system redundancy through a simple configuration. A primary storage control device and first secondary storage control device are connected by a synchronous method, and the primary storage control device and a second secondary storage control device are connected by an asynchronous method. The primary storage control device sets control numbers for update data, and saves journal data. The primary storage control device transmits the update data to the first secondary storage control device. The first secondary storage control device writes update data to a first secondary volume, and uses a plurality of bitmap tables to manage differences. If the primary storage control device stops operation, the first secondary storage control device becomes the new primary storage control device. Differential copying is performed from the first secondary storage control device to the second secondary storage control device.
    Type: Grant
    Filed: October 21, 2005
    Date of Patent: September 2, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Kaiya, Katsuhiro Okumoto, Shuji Kondou
  • Storage system and storage system management method
    Publication number: 20070050574
    Abstract: A storage system secures system redundancy through a simple configuration. A primary storage control device and first secondary storage control device are connected by a synchronous method, and the primary storage control device and a second secondary storage control device are connected by an asynchronous method. The primary storage control device sets control numbers for update data, and saves journal data. The primary storage control device transmits the update data to the first secondary storage control device. The first secondary storage control device writes update data to a first secondary volume, and uses a plurality of bitmap tables to manage differences. If the primary storage control device stops operation, the first secondary storage control device becomes the new primary storage control device. Differential copying is performed from the first secondary storage control device to the second secondary storage control device.
    Type: Application
    Filed: October 21, 2005
    Publication date: March 1, 2007
    Inventors: Keiichi Kaiya, Katsuhiro Okumoto, Shuji Kondou