Patents by Inventor Andrew W. Leung

Andrew W. Leung 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).

  • Method and apparatus to manage and control a power state of a device set based on availability requirements of corresponding logical addresses
    Patent number: 9141172
    Abstract: A method and apparatus to control and manage a power state in a related set of storage devices is described. In one example a method includes, determining an idleness measure at the file system, the idleness measure indicating availability requirements of the device set, and setting an idle state based on the idleness measure. The method also includes receiving the idle state setting at the storage subsystem, determining whether the idle state setting is different from a current state of the device set, determining whether to change the idle state of the device set if the idle state setting is different from the current state of the device set, the determining being based on information about the device set. The method also includes commanding the device set to change the current idle state to correspond to the idle state setting based on determining whether to change the idle state.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: September 22, 2015
    Assignee: EMC Corporation
    Inventors: Andrew W. Leung, Kevin M. Greenan, Windsor W. Hsu
  • Method and apparatus to exercise and manage a related set of power managed storage devices
    Patent number: 9021275
    Abstract: A method and apparatus to exercise and manage a related set of power managed storage devices is described. In one example a method includes receiving a request to allow a transition of the set of storage devices from a first power state to a second power state, determining a wear level for each device in the set, comparing the determined wear levels to thresholds, testing data integrity for each device in the set, and if the wear level does not exceed the threshold and the data integrity tests are passed, then commanding the requested power state transition.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: April 28, 2015
    Assignee: EMC Corporation
    Inventors: Kevin M. Greenan, Andrew W. Leung, Windsor W. Hsu
  • Method and apparatus to determine an idle state of a device set based on availability requirements corresponding to the device set
    Patent number: 8862923
    Abstract: A method and apparatus to control and manage a power state in a related set of storage devices is described. In one example a method includes, determining an idleness measure at the file system, the idleness measure indicating availability requirements of the device set, and setting an idle state based on the idleness measure. The method also includes receiving the idle state setting at the storage subsystem, determining whether the idle state setting is different from a current state of the device set, determining whether to change the idle state of the device set if the idle state setting is different from the current state of the device set, the determining being based on information about the device set. The method also includes commanding the device set to change the current idle state to correspond to the idle state setting based on determining whether to change the idle state.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: October 14, 2014
    Assignee: EMC Corporation
    Inventors: Andrew W. Leung, Kevin M. Greenan, Windsor W. Hsu