Patents by Inventor David Joshua Brown

David Joshua Brown 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: 8667494
    Abstract: Described are techniques for allocating resources. Two consumer processes using two resources are provided. A first threshold of a first of the resources for a first of said two consumer processes is provided. A second threshold of a second of said resources for said first consumer process is provided. Consumption information is received regarding actual consumption of the two resources by the first consumer process. Execution of the first consumer process is scheduled in accordance with the first and the second thresholds and the consumption information.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: March 4, 2014
    Assignee: EMC Corporation
    Inventors: Patrick Brian Riordan, David Joshua Brown, Kenneth A. Halligan, Arieh Don
  • Patent number: 7707331
    Abstract: Described is a distributed copying technique that may be used in migrating large amounts of data from one or more source devices to one or more destination devices. The data source is divided into partitions. As Fibre Channel adapters (FAs) become available, each of the FAs may copy a partition of the data. In connection with specifying paths used for the distributed copying technique, a preferred path selection (source port-target port mapping) may be made by executing code in a controlling data storage system to perform discovery processing. The preferred path selection is used for the duration of the distributed copying unless the preferred path is unable to transmit data. A target port of the preferred path may be randomly selected from all accessible target ports, and/or in accordance with a specified portion of the target ports. Preferred paths may also be specified using an API (application programming interface).
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: April 27, 2010
    Assignee: EMC Corporation
    Inventors: David Joshua Brown, Michael Scharland, Patrick Brian Riordan, Kenneth A. Halligan, Arieh Don
  • Patent number: 7689786
    Abstract: Described are techniques for overriding an existing device reservation. Discovery processing is performed by a first data storage system to locate a specified device. The discovery processing includes determining whether there is a reservation conflict for said device of a second data storage system. If there is a reservation conflict for the device, a command is issued from the first data storage system to the second data storage system during said discovery processing to create an override for said reservation conflict. The override causes processing to be performed at a subsequent point in time so that an existing reservation associated with the reservation conflict is overridden in connection with performing a first process on said first data storage system.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: March 30, 2010
    Assignee: EMC Corporation
    Inventors: Patrick Brian Riordan, Arieh Don, Michael E. Bappe, Helen S. Raizen, Michael J. Scharland, David Joshua Brown
  • Patent number: 7640408
    Abstract: Described are techniques for use with online data copying or migration. Data is pushed from a source to a target device while one or both of the source and target devices are available for use by one or more host systems. The host systems may perform I/O operations to the source and/or target devices while the data migration is ongoing if a copy session is defined on the data storage system(s) of the source and/or target devices. A copying operation performs data migration from the source to the target device. A migration vector is used to indicate which portions of the source have been migrated. A change vector may be associated with each of the source and/or target devices to indicate portions that have been modified in order to perform a differential copy operation.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: December 29, 2009
    Assignee: EMC Corporation
    Inventors: Kenneth A. Halligan, Arieh Don, Michael Scharland, David Joshua Brown, Patrick Brian Riordan
  • Patent number: 7634595
    Abstract: Described is a distributed copying technique that may be used in migrating large amounts of data from one or more source devices to one or more destination devices. The data source is divided into partitions. As Fibre Channel adapters (FAs) become available, each of the FAs may copy a partition of the data. In connection with specifying paths used for the distributed copying technique, a preferred path selection (source port-target port mapping) may be made by executing code in a controlling data storage system to perform discovery processing. The preferred path selection is used for the duration of the distributed copying unless the preferred path is unable to transmit data. A target port of the preferred path may be randomly selected from all accessible target ports, and/or in accordance with a specified portion of the target ports. Preferred paths may also be specified using an API (application programming interface).
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: December 15, 2009
    Assignee: EMC Corporation
    Inventors: David Joshua Brown, Michael Scharland, Patrick Brian Riordan, Kenneth A. Halligan, Arieh Don
  • Patent number: 7565581
    Abstract: Described are techniques for use with an error handling policy for a data storage system. Error handling criteria may be specified for controlling behavior of the data storage system upon the occurrence of an internal processing error occurring when performing an ancillary task associated with a data operation received by the data storage system. The error handling criteria may include a threshold counter value, and one or more of: a device, a specific device location or address, and a host. An error may be conditionally returned to the host upon the occurrence of an internal processing error in accordance with the error handling criteria.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: July 21, 2009
    Assignee: EMC Corporation
    Inventors: Kenneth A. Halligan, Michael Scharland, David Joshua Brown, Patrick Brian Riordan, Arieh Don
  • Patent number: 7434022
    Abstract: Described is a distributed copying technique that may be used in migrating large amounts of data from one or more source devices to one or more destination devices. The data source is divided into partitions. As Fibre Channel adapters (FAs) become available, each of the FAs may copy a partition of the data. A copy indicator value indicates the last partition delegated to an FA for copying. The last FA to complete copying is responsible for ensuring completed copying of any other data partitions delegated to an FA which has died during migration of the other data partitions. In the event that the last FA dies prior to completing its processing, additional steps are performed by other remaining FAs to copy all data partitions not known to be successfully migrated.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: October 7, 2008
    Assignee: EMC Corporation
    Inventors: Michael Scharland, Arieh Don, Patrick Brian Riordan, David Joshua Brown, Kenneth A. Halligan