Patents by Inventor Kiyohiro Obara

Kiyohiro Obara 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).

  • Publication number: 20020194426
    Abstract: A storage subsystem include: a plurality of disk controllers; a plurality of disk drives connected via a network to the plurality of disk controllers; and a path controller connected to the plurality of disk controllers. The path controller changes a management site, which manages a volume in each of the plurality of disk drives managed by each of the plurality of disk controllers, from one of the plurality of disk controllers to another. The path controller has a correspondence table which stores a correspondence between a volume number of a volume in each of the plurality of disk drives and identification information of the disk controller which manages a volume corresponding to the volume number.
    Type: Application
    Filed: April 8, 1999
    Publication date: December 19, 2002
    Inventors: KIYOHIRO OBARA, YOSHIFUMI TAKAMOTO
  • Publication number: 20020133671
    Abstract: A storage subsystem which includes a plurality of disk controllers, a plurality of disk drives connected via a network to the plurality of disk controllers, and a path controller connected to the plurality of disk controllers. The path controller changes a management site, which manages a volume in each disk drive managed by each disk controller, from one disk controller to another. The path controller has a correspondence table which stores a correspondence between a volume number of a volume in each disk drive and identification information of the disk controller which manages a volume corresponding to the volume number.
    Type: Application
    Filed: March 27, 2002
    Publication date: September 19, 2002
    Inventors: Kiyohiro Obara, Yoshifumi Takamoto
  • Publication number: 20020099901
    Abstract: A virtual private volume control system, wherein in a data frame of a command issued from an OS, an ID number for identifying the OS is attached to the command; inside the disk apparatus, exclusion/priority processing is controlled, based on the ID number; thereby enhancing the transaction processing performance of a complex of servers and the disk apparatus as a whole.
    Type: Application
    Filed: August 1, 2001
    Publication date: July 25, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Atsushi Tanaka, Kiyohiro Obara, Hiroaki Odawara
  • Publication number: 20020059307
    Abstract: The object of the present invention is to achieve data transforming method of database management system, which may transform data within the disk storage device when transforming database data formats so as to reduce the system load, when converting data formats between database management systems.
    Type: Application
    Filed: March 19, 2001
    Publication date: May 16, 2002
    Inventors: Aki Tomita, Kiyohiro Obara
  • Patent number: 6378039
    Abstract: A storage subsystem include: a plurality of disk controllers; a plurality of disk drives connected via a network to the plurality of disk controllers; and a path controller connected to the plurality of disk controllers. The path controller changes a management site, which manages a volume in each of the plurality of disk drives managed by each of the plurality of disk controllers, from one of the plurality of disk controllers to another. The path controller has a correspondence table which stores a correspondence between a volume number of a volume in each of the plurality of disk drives and identification information of the disk controller which manages a volume corresponding to the volume number.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: April 23, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Kiyohiro Obara, Yoshifumi Takamoto
  • Publication number: 20020002638
    Abstract: An online data migration method is provided for transferring data from a computer and an existing storage system using the conventional interface such as SCSI to a new storage system using SAN. The present method comprises the steps of disconnecting the connection between the computer and the first storage system with first interface protocol, connecting the computer to a switch connected to a second storage system with a second interface protocol through first protocol converter having protocol converting facility, connecting the switch to the first storage system through second protocol converter, and migrating data in the first storage system into the second storage system via the switch.
    Type: Application
    Filed: February 12, 2001
    Publication date: January 3, 2002
    Inventor: Kiyohiro Obara
  • Patent number: 6115787
    Abstract: In order to store plural compressed records into a cache memory of a disk storage system in an easy-to-read manner, data to be stored in the cache memory is divided into plural data blocks each having two cache blocks in association with track blocks to which the data belongs and are compressed. The respective data blocks after the compression are stored in one or plural cache blocks. Information for retrieving each cache block from an in-track address for the data block is stored as part of retrieval information for the cache memory. When the respective data blocks in a record is read, the cache block storing the compressed data block is determined based on the in-track address of the data block and the retrieval information.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: September 5, 2000
    Assignee: Hitachi, Ltd.
    Inventor: Kiyohiro Obara
  • Patent number: 5758053
    Abstract: Parallel processors communicate with each other over a network by transmitting messages that include destination processor information. A message controller for each processor in the network receives the messages and checks for faults in the message, particularly in the destination processor number contained in a first word of the message. If a fault occurs in the destination processor number, then the faulty message is transmitted to an appropriate processor for handling the fault. In this way the network operation is not suspended because of the fault and the message is not left in the network as a result of the error occurring in the destination processor number. The processor to which the faulty message is directed is determined by a substitute destination processor number contained in the message or is predetermined and set in another way, such as by a service processor.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: May 26, 1998
    Assignees: Hitachi, Ltd., Hitachi ULSI Engineering Corp.
    Inventors: Shigeo Takeuchi, Yasuhiro Inagaki, Junji Nakagoshi, Shinichi Shutoh, Tatsuo Higuchi, Hiroaki Fujii, Yoshiko Yasuda, Kiyohiro Obara, Taturu Toba, Masahiro Yamada