Patents by Inventor Joydeep sen Sarma

Joydeep sen Sarma 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).

  • System and method for coordinating cluster state information
    Patent number: 7231489
    Abstract: A system and method for an improved mailbox mechanism to contain coordinating information for computers in a cluster environment is provided. The system and method creates two copies of a master mailbox record stored in a set and predetermined location on disks associated with the cluster. A subset of the disks is designated as lock disks, which must contain the most up-to-date coordinating information.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: June 12, 2007
    Assignee: Network Appliance, Inc.
    Inventors: Richard O. Larson, Alan L. Rowe, Joydeep sen Sarma
  • System and method for allocating spare disks in networked storage
    Patent number: 7146522
    Abstract: A system and method for a file server to allocate spare disks in a network storage system. The method determines the available spare disks and first selects those disks that satisfy one or more required rules. The method sorts the spare disks by a set of ordered policies to determine a highest-ranked disk that is then selected as the spare to be utilized. If multiple disks are equally ranked, one of the equally ranked disks is randomly chosen to be the spare disk allocated.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 5, 2006
    Assignee: Network Appliance, Inc.
    Inventors: Alan L. Rowe, Richard O. Larson, Susan M. Coatney, Joydeep sen Sarma, Samuel M. Cramer
  • Mirror split brain avoidance
    Patent number: 7111194
    Abstract: A technique includes a set of procedures utilized during the transfer of service of a failed storage system to a surviving storage system of a cluster failover (CFO) configuration during a system outage, such as a disaster scenario. The procedures are executed by a RAID subsystem of the surviving storage system during disaster takeover, storage healing and node restart operations. The procedures prevent the possibility that clients accessing the storage system will see out-of-date versions of the data either during transfer of service of the system during the disaster scenario or subsequently after the storage system is healed and service on the failed system has been restored.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: September 19, 2006
    Assignee: Network Appliance, Inc.
    Inventors: Scott Schoenthal, Steven H. Rodrigues, Alan L. Rowe, Joydeep sen Sarma, Susan M. Coatney
  • System and method of implementing disk ownership in networked storage
    Publication number: 20030120743
    Abstract: A system and method for disk ownership in a network storage system. Each disk has two ownership attributes set to show that a particular file server owns the disk. In a preferred embodiment the first ownership attribute is the serial number of the file server being written to a specific location on each disk and the second ownership attribute is setting a SCSI-3 persistent reservation. In a system utilizing this disk ownership method, multiple file servers can read data from a given disk, but only the file server that owns a particular disk can write data to the disk.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 26, 2003
    Inventors: Susan M. Coatney, Alan L. Rowe, Radek Aster, Joydeep Sen Sarma