Patents by Inventor Norikazu Kaiya

Norikazu Kaiya 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).

  • Patent number: 6757797
    Abstract: A copying method, disk storage system, and storage medium for copying data from one logical disk to another logical disk, making possible immediate access, in response to a copy command. Copying from a first logical disk to a second logical disk is performed for each area in a copy range, and when there is an access to either logical disk, copying is interrupted. When performing update access of an uncopied area in the first logical disk, the area is copied from the first logical disk to the second logical disk, and then the uncopied area is updated. When performing reference access of an uncopied area in the second logical disk, the corresponding area in the first logical disk is referenced. When performing update access of an uncopied area in the second logical disk, that area in the second logical disk is updated, and copying is prohibited.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: June 29, 2004
    Assignee: Fujitsu Limited
    Inventors: Norikazu Kaiya, Yasuhiro Onda, Tadaomi Kato
  • Patent number: 6732245
    Abstract: A copying method, disk storage system, and storage medium for copying data from one logical disk to another logical disk, making possible immediate access, in response to a copy command. Copying from a first logical disk to a second logical disk is performed for each area in a copy range, and where is an access to either logical disk, copying is interrupted. When performing update access of an uncopied area in the first logical disk, the area is copied from the first logical disk to a second logical disk, and then the uncopied area is updated. When performing reference access of an uncopied area in the second logical disk, the corresponding area in the first logical disk is referenced. When performing update access of an uncopied area in the second logical disk, that area in the second logical disk is updated, and copying is prohibited.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: May 4, 2004
    Assignee: Fujitsu Limited
    Inventors: Norikazu Kaiya, Yasuhiro Onda, Tadaomi Kato
  • Publication number: 20030028737
    Abstract: This invention relates to a copying method, disk storage system and storage medium for copying data from one logical disk to another logical disk, and makes immediate access in response to a copy command possible. Copying from logical disk 1 to logical disk 2 is performed for each area in the copy range, and when there is access, copying is interrupted. When performing update access of an uncopied area in the copy source 1, the area is copied from the copy source 1 to the copy destination, and then the area is updated. When performing reference access of an uncopied area in the copy destination 2, the corresponding area in the copy source 1 is referenced. When performing update access of an uncopied area in the copy destination 2, that area in the copy destination is updated, and copying is prohibited. In this way, it is possible to access the copy source 1 and copy destination 2 while copying is in progress, and it is possible to immediately regard that copying is completed by a copy instruction.
    Type: Application
    Filed: September 30, 2002
    Publication date: February 6, 2003
    Applicant: FUJITSU LIMITED
    Inventors: Norikazu Kaiya, Yasuhiro Onda, Tadaomi Kato