Robert E Probst

US Patent:

55662994, Oct 15, 1996

Filed:

Dec 30, 1993

Appl. No.:

8/175825

Inventors:

Douglas W. Billings - Gaithersburg MD
James W. Cullen - Frederick MD
William W. Klein - Olney MD
Robert E. Probst - Reston VA
George J. Meyers - Annapolis MD
Walter C. Rose - Frederick MD

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G06F 1100

US Classification:

39518202

Abstract:

A high availability method and system manipulate and store document images and coded data. The method and system include an image local area network and a coded data local area network. The image local area network is operated at a high utilization because of the relatively large size of the image files transmitted over it. The coded data local area network is operated at a relatively low utilization level because of a relatively small size of the coded data files transmitted over it. Two or more work group servers are connected to the image local area network. Each work group server is connected through a work group local area network to the coded data local area network. Each work group server operates in both a primary mode to service its own work group LAN and in a hot standby mode to serve as a backup processor for its corresponding work group server when the corresponding work group server is in a failure mode. When the failure mode occurs, a local area network manager reroutes image files from the first work group local area network over the under utilized coded data local area network, to the second work group local area network and its work group server which is operating in a hot standby mode. In this manner, a high availability is provided for the image file processing and coded data processing by providing alternate LAN links having adequate capacity to accommodate the large rerouted image files.

US Patent:

51539365, Oct 6, 1992

Filed:

Jul 19, 1990

Appl. No.:

7/559526

Inventors:

Hugh M. Morris - Gaithersburg MD
Carol A. Parks - Monrovia MD
Robert E. Probst - Reston VA
Yakov Tsalalikhin - Peekskill NY
Gary L. Youngs - Gaithersburg MD
Doraiswamy Rajagopal - Rockville MD

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1540

US Classification:

395128

Abstract:

A data processing system stores and displays digital images, and includes a workstation having a document input scanner for digitizing document images at a first resolution, an image display unit for displaying digitized document images at a second resolution which is less than the first resolution and a printer for printing digitized document images at a third resolution greater than the second resolution. The system reduces communications traffic and assures fast access time on the network since the bulk of the traffic will utilize the smaller compressed data records required for the second resolution. However, these improvements in communication traffic and access time do not sacrifice the availability of high resolution compressed data records occasionally needed for printing and other high resolution operations.