Patents by Inventor Krishna K. Kumar

Krishna K. Kumar 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).

  • Emulation of persistent group reservations
    Patent number: 6658587
    Abstract: Method for emulating persistent group reservations on non persistent group reservation-compliant devices, apparatus to perform the method, and computer-readable storage medium containing instructions to perform the method. The present invention enables the emulation of persistent group reservations on a non persistent group reservation-compliant device, including a shared disk, to enable the disk's implementation of persistent group reservation-reliant algorithms. This in turn enables the implementation of algorithms based on persistent group reservation features substantially without modification of those algorithms. One such algorithm is a quorum algorithm. One example of persistent group reservations is found in the SCSI-3 standard. The present invention accomplishes persistent group reservation emulation, or PGRE, by storing host- and reservation-specific information on a reserved portion of the disk and using this data to emulate the steps of certain persistent group reservation features.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: December 2, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Ira Pramanick, Declan J. Murphy, Krishna K. Kumar, Siamak Nazari, Andrew L. Hisgen