Patents by Inventor Katsuhiko Nagashima

Katsuhiko Nagashima 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: 20040230742
    Abstract: A storage system prevents a time out error of the host I/O caused by a stagnation of command processing in the storage system for accessing a disk device according to the host I/O request and internal I/O request. In DTC, counters for managing the requests in-process for host I/Os (host read) and internal I/Os (pre-fetch, write back) individually are provided, and the number of processing requests to be issued to a virtual disk (RLU) is limited individually. By assigning priority to the host I/Os, the load balance of the host I/Os and internal I/Os can be controlled. For rebuild/copy back, a dedicated load control mechanism is disposed where the load adjustment between ordinary I/Os and rebuild/copy back is performed.
    Type: Application
    Filed: February 26, 2004
    Publication date: November 18, 2004
    Applicant: Fujitsu Limited
    Inventors: Kazuhiko Ikeuchi, Mikio Ito, Hidejirou Daikokuya, Kazuma Takatsu, Katsuhiko Nagashima, Koji Uchida, Akihito Kobayashi