Patents by Inventor Paul A. Linstead

Paul A. Linstead 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).

  • Intercepting control of a host I/O process
    Patent number: 6954835
    Abstract: A data-mirroring method in which, while an I/O process is processing a first I/O request for writing data to a first device, control is obtained from that I/O process executing on a host computer. A second I/O request, this one for writing the data to the second device, is then created. Then, control is returned to the I/O process by causing the first I/O request to be made available to a first data storage system managing the first device.
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: October 11, 2005
    Assignee: EMC Corporation
    Inventors: Douglas E. Lecrone, Paul A. Linstead, Daniel A. Murphy, Denis E. Hall, Raymond Wong, Eugene D. Pflueger, Kevin C. Heasley, Michael E. Specht, Stewart C. Woodworth, III
  • Method and apparatus for enhancing access to redundant data storage facilities
    Patent number: 6874046
    Abstract: A dynamic address switching system for use in a data processing system with redundant data storage facilities. A validation routine or module assures that dynamic switching can occur between logical devices. A swapping routine exchanges information in unit control blocks for logical devices in the redundant system thereby to enable I/O requests from a host to be redirected over another channel to the other data storage facility.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: March 29, 2005
    Assignee: EMC Corporation
    Inventors: Douglas E. LeCrone, Paul A. Linstead