John M Kerulis

US Patent:

6952741, Oct 4, 2005

Filed:

Jun 30, 1999

Appl. No.:

09/345698

Inventors:

James Bartlett - Arlington TX, US
John Kerulis - Little Elm TX, US
Robert Ngan - Chicago IL, US
Jay Rasmussen - Coppell TX, US
Brian Rittenhouse - Frisco TX, US

Assignee:

Computer Sciences Corporation - Austin TX

International Classification:

G06F015/16
G06F012/00

US Classification:

709245, 709248, 711100, 711118, 711154

Abstract:

An improved synchronization system and method for copies of data in a computer system. The computer system comprises a cluster, wherein each computer in the cluster may store a local copy of a data set along with a validity flag for the local copy. The computer system further comprises a coupling system which is connected to each of the computers in the cluster through a coupling system interface program, wherein the coupling system is configured to coordinate the data sharing and workload of the cluster. The computer system also comprises an external data storage shared by the computers in the cluster. One of the computers may read a first copy of the data set from a primary data set on the external data storage. The computer may then store the first copy locally and set a first validity flag to indicate that the first copy is valid. Another computer, server, or application program may make a second copy of the primary data set and set a second validity flag to valid.

US Patent:

7130924, Oct 31, 2006

Filed:

Oct 4, 2005

Appl. No.:

11/243461

Inventors:

James Bartlett - Arlington TX, US
John Kerulis - Little Elm TX, US
Robert Ngan - Chicago IL, US
Jay Rasmussen - Coppell TX, US
Brian Rittenhouse - Frisco TX, US

Assignee:

Computer Sciences Corporation - Austin TX

International Classification:

G06F 15/16
G06F 12/00

US Classification:

709245, 711100, 711118, 711154, 709248

Abstract:

An improved synchronization system and method for copies of data in a computer system. The computer system comprises a cluster, wherein each computer in the cluster may store a local copy of a data set along with a validity flag for the local copy. The computer system further comprises a coupling system which is connected to each of the computers in the cluster through a coupling system interface program, wherein the coupling system is configured to coordinate the data sharing and workload of the cluster. The computer system also comprises an external data storage shared by the computers in the cluster. One of the computers may read a first copy of the data set from a primary data set on the external data storage. The computer may then store the first copy locally and set a first validity flag to indicate that the first copy is valid. Another computer, server, or application program may make a second copy of the primary data set and set a second validity flag to valid.

US Patent:

7581025, Aug 25, 2009

Filed:

Oct 31, 2006

Appl. No.:

11/590666

Inventors:

James Bartlett - Arlington TX, US
John Kerulis - Little Elm TX, US
Robert Ngan - Chicago IL, US
Jay Rasmussen - Coppell TX, US
Brian Rittenhouse - Frisco TX, US

Assignee:

Computer Sciences Corporation - El Segundo CA

International Classification:

G06F 15/16
G06F 12/00

US Classification:

709245, 711100, 711118, 711144, 711154, 709248

Abstract:

An improved synchronization system and method for copies of data in a computer system. The computer system comprises a cluster, wherein each computer in the cluster may store a local copy of a data set along with a validity flag for the local copy. The computer system further comprises a coupling system which is connected to each of the computers in the cluster through a coupling system interface program, wherein the coupling system is configured to coordinate the data sharing and workload of the cluster. The computer system also comprises an external data storage shared by the computers in the cluster. One of the computers may read a first copy of the data set from a primary data set on the external data storage. The computer may then store the first copy locally and set a first validity flag to indicate that the first copy is valid. Another computer, server, or application program may make a second copy of the primary data set and set a second validity flag to valid.

US Patent:

6446086, Sep 3, 2002

Filed:

Jun 30, 1999

Appl. No.:

09/345699

Inventors:

James Bartlett - Arlington TX
John Kerulis - Little Elm TX
Robert Ngan - Chicago IL
Jay Rasmussen - Coppell TX
Brian Rittenhouse - Frisco TX

Assignee:

Computer Sciences Corporation - Austin TX

International Classification:

G06F 1730

US Classification:

707200

Abstract:

An improved method and system for logging transaction records in a computer system. The method may include writing a confirmation log record to the log file for a transaction that completes normally, and not writing a confirmation log record for transactions that are aborted. The log file may be unloaded periodically by an unload program. The unload program may write transaction log records accompanied by a confirmation log record to a good output file and transaction log records not accompanied by a confirmation log record to a suspended output file. On a subsequent execution, the unload program may combine the log records in the log file and the suspended file. The unload program may write transaction log records accompanied by a confirmation log record to a good output file. The unload program may write transaction log records not accompanied by a confirmation log record and which have not exceeded a transaction time limit to a suspended output file. The unload program may write transaction log records not accompanied by a confirmation log record and which have exceeded a transaction time limit to a disposal output file.