Patents by Inventor Siew Yong Sim

Siew Yong Sim 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: 9122627
    Abstract: The present invention provides a distributed clustering method to allow multiple active instances of consistency management processes that apply the same encoding scheme to be cooperative and function collectively. The techniques described herein facilitate an efficient method to apply an erasure encoding and decoding scheme across dispersed data stores that receive constant updates. The technique can be applied on many forms of distributed persistent data stores to provide failure resiliency and to maintain data consistency and correctness.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: September 1, 2015
    Assignee: Dell Software Inc.
    Inventors: Siew Yong Sim-Tang, Semen Alexandrovich Ustimenko
  • Patent number: 9021309
    Abstract: A method is integrated into the local operating system of a test machine. The disclosed technique preferably uses a master copy of one or more data objects from a first location to create virtual data objects (e.g., files or folders) that appear to be part of a file system mounted to a test machine in a second location. This disclosure describes a “projection” method and computer program that enables access to a destination object at a target location immediately upon initiation of a copy command at a source location while a copy operation is carried out in a background manner.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: April 28, 2015
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8972347
    Abstract: A data management system (DMS) includes a continuous real-time object store that captures all real-time activities, with associated object metadata information. The DMS is capable of reintroducing any point-in-time view of data ranging from a granular object to an entire file system. A set of algorithms (for creation of a file or directory, modification of a file or directory, deletion of a file or directory, and relocation/renaming of a file or directory) are used to generate and maintain a file system history in the DMS and to ensure that a latest version of a directory always refers to a latest version of its children until the directory changed. Any point-in-time recovery is implemented using the file system history in one of various ways to provide strong individual file integrity, exact point-in-time crash consistency, and/or recovery of last version of all files in the file system.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: March 3, 2015
    Assignee: Dell Software Inc.
    Inventor: Siew Yong Sim-Tang
  • Publication number: 20140143283
    Abstract: A method is integrated into the local operating system of a test machine. The disclosed technique preferably uses a master copy of one or more data objects from a first location to create virtual data objects (e.g., files or folders) that appear to be part of a file system mounted to a test machine in a second location. This disclosure describes a “projection” method and computer program that enables access to a destination object at a target location immediately upon initiation of a copy command at a source location while a copy operation is carried out in a background manner.
    Type: Application
    Filed: July 15, 2013
    Publication date: May 22, 2014
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8712970
    Abstract: A data management method wherein a real-time history of a database system is stored as a logical representation and the logical representation is then used for any point-in-time recovery of the database system. More specifically, a method for capturing transaction data, binary data changes, metadata, and events, and for tracking a real-time history of a database system according to the events. The method enables tracking and storing of consistent checkpoint images of the database system, and also enables tracking of transaction activities between checkpoints. The database system may be recovered to any consistent checkpoint or to any point between two checkpoints.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: April 29, 2014
    Assignee: Dell Software Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8650167
    Abstract: A “forward” delta data management technique uses a “sparse” index associated with a delta file to achieve both delta management efficiency and to eliminate read latency while accessing history data. The invention may be implemented advantageously in a data management system that provides real-time data services to data sources associated with a set of application host servers. A host driver embedded in an application server connects an application and its data to a cluster. The host driver captures real-time data transactions, preferably in the form of an event journal that is provided to the data management system. In particular, the driver functions to translate traditional file/database/block I/O into a continuous, application-aware, output data stream. A given application-aware data stream is processed through a multi-stage data reduction process to produce a compact data representation from which an “any point-in-time” reconstruction of the original data can be made.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: February 11, 2014
    Assignee: Dell Software Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8639974
    Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: January 28, 2014
    Assignee: Dell Software Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8544023
    Abstract: A data management system that protects data into a continuous object store includes a management interface having a time control. The time control allows an administrator to specify a “past” time, such as a single point or range. When the time control is set to a single point, a hierarchical display of data appears on a display exactly as the data existed in the system at that moment in the past. The time control enables the management interface to operate within a history mode in which the display provides a visual representation of a “virtual” point in time in the past during which the data management system has been operative to provide the data protection service.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: September 24, 2013
    Assignee: Dell Software Inc.
    Inventors: Siew Yong Sim-Tang, Daniel J. Fraisl, Anthony N. Hoeber
  • Patent number: 8489930
    Abstract: A method is integrated into the local operating system of a test machine. The disclosed technique preferably uses a master copy of one or more data objects from a first location to create virtual data objects (e.g., files or folders) that appear to be part of a file system mounted to a test machine in a second location. This disclosure describes a “projection” method and computer program that enables access to a destination object at a target location immediately upon initiation of a copy command at a source location while a copy operation is carried out in a background manner.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: July 16, 2013
    Assignee: Instavia Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8429198
    Abstract: A data management system or “DMS” provides data services to data sources associated with a set of application host servers. The DMS typically comprises one or more regions, with each region having one or more clusters. A given cluster has one or more nodes that share storage. When providing continuous data protection and data distribution, the DMS nodes create distributed active object storage to provide the necessary real-time data management services. The distributed object store can be built above raw storage devices, a traditional file system, a special purpose file system, a clustered file system, and a database. The DMS active object store provides an indexing service to the active objects. In an illustrative embodiment, any object property that has a given attribute is indexed and, as a result, the attribute becomes searchable. The DMS provides hierarchical distributed indexing using index trees to facilitate searching.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: April 23, 2013
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8375248
    Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: February 12, 2013
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8364648
    Abstract: A data management method wherein a real-time history of a database system is stored as a logical representation and the logical representation is then used for any point-in-time recovery of the database system. More specifically, a method for capturing transaction data, binary data changes, metadata, and events, and for tracking a real-time history of a database system according to the events. The method enables tracking and storing of consistent checkpoint images of the database system, and also enables tracking of transaction activities between checkpoints. The database system may be recovered to any consistent checkpoint or to any point between two checkpoints.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: January 29, 2013
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8365017
    Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: January 29, 2013
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8352523
    Abstract: A data management system (DMS) includes a continuous real-time object store that captures all real-time activities, with associated object metadata information. The DMS is capable of reintroducing any point-in-time view of data ranging from a granular object to an entire file system. A set of algorithms (for creation of a file or directory, modification of a file or directory, deletion of a file or directory, and relocation/renaming of a file or directory) are used to generate and maintain a file system history in the DMS and to ensure that a latest version of a directory always refers to a latest version of its children until the directory changed. Any point-in-time recovery is implemented using the file system history in one of various ways to provide strong individual file integrity, exact point-in-time crash consistency, and/or recovery of last version of all files in the file system.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: January 8, 2013
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Publication number: 20120284238
    Abstract: A “forward” delta data management technique uses a “sparse” index associated with a delta file to achieve both delta management efficiency and to eliminate read latency while accessing history data. The invention may be implemented advantageously in a data management system that provides real-time data services to data sources associated with a set of application host servers. A host driver embedded in an application server connects an application and its data to a cluster. The host driver captures real-time data transactions, preferably in the form of an event journal that is provided to the data management system. In particular, the driver functions to translate traditional file/database/block I/O into a continuous, application-aware, output data stream. A given application-aware data stream is processed through a multi-stage data reduction process to produce a compact data representation from which an “any point-in-time” reconstruction of the original data can be made.
    Type: Application
    Filed: June 1, 2012
    Publication date: November 8, 2012
    Applicant: QUEST SOFTWARE, INC.
    Inventor: Siew Yong Sim-Tang
  • Publication number: 20120266019
    Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.
    Type: Application
    Filed: June 27, 2012
    Publication date: October 18, 2012
    Applicant: QUEST SOFTWARE, INC.
    Inventor: Siew Yong Sim-Tang
  • Publication number: 20120254659
    Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 4, 2012
    Applicant: QUEST SOFTWARE, INC.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8205139
    Abstract: The present invention provides a distributed clustering method to allow multiple active instances of consistency management processes that apply the same encoding scheme to be cooperative and function collectively. The techniques described herein facilitate an efficient method to apply an erasure encoding and decoding scheme across dispersed data stores that receive constant updates. The technique can be applied on many forms of distributed persistent data stores to provide failure resiliency and to maintain data consistency and correctness.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: June 19, 2012
    Assignee: Quest Software, Inc.
    Inventors: Siew Yong Sim-Tang, Semen Alexandrovich Ustimenko
  • Patent number: 8200706
    Abstract: A data management system or “DMS” provides data services to data sources associated with a set of application host servers. The data management system typically comprises one or more regions, with each region having one or more clusters. A given cluster has one or more nodes that share storage. When providing continuous data protection and data distribution, the DMS nodes create distributed object storage to provide the necessary real-time data management services. The objects created by the DMS nodes are so-called active objects. The distributed object store can be built above raw storage devices, a traditional file system, a special purpose file system, a clustered file system, a database, and so on. According to the present invention, the DMS active object store provides an indexing service to the active objects. In an illustrative embodiment, any object property that has a given attribute is indexed and, as a result, the attribute becomes searchable.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: June 12, 2012
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang
  • Patent number: 8195628
    Abstract: A “forward” delta data management technique uses a “sparse” index associated with a delta file to achieve both delta management efficiency and to eliminate read latency while accessing history data. The invention may be implemented advantageously in a data management system that provides real-time data services to data sources associated with a set of application host servers. A host driver embedded in an application server connects an application and its data to a cluster. The host driver captures real-time data transactions, preferably in the form of an event journal that is provided to the data management system. In particular, the driver functions to translate traditional file/database/block I/O into a continuous, application-aware, output data stream. A given application-aware data stream is processed through a multi-stage data reduction process to produce a compact data representation from which an “any point-in-time” reconstruction of the original data can be made.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: June 5, 2012
    Assignee: Quest Software, Inc.
    Inventor: Siew Yong Sim-Tang