Unisys Corporation

Lois Bridgham Coyne

Susan Mary Jennion

Charles Austin Parker

Sarah K Inforzato

Anthony Narisi

Michael T Kain

Mark Steven Brandt

Robert Frank Inforzato

James J Leigh

Christopher John Harrer

Frances Ann Laukagalis

Gary Salamon

Jeffrey John Wilson

Vinh Ha Le

Margaret Ann Magnotta

Michelle Marie Salvado

A distributed computer system comprises an enterprise server and a network server. The distributed computer system utilizes a distributed transmission control protocol (TCP) to establish an off-loaded dialog through the network server. If the off-loaded dialog is interrupted by, e.g., failure of the hosting network server, dialog recovery is performed to move the off-loaded dialog.

Dialog recovery in a distributed computer system

Methods and apparatus that enable a transport protocol executing on a first computer system to be utilized by applications executing on a second computer system which is directly interconnected and closely coupled to the first computer system. An interconnection couples an input/output (I/O) subsystem of the first computer system to an I/O subsystem of the second computer system and provides a path over which data can be transmitted between the first and second computer systems independent of a network interface card, and an interconnection messaging system executing on the first and second computer systems provides general purpose transport interfaces between said first and second computer systems. A distributed transport communications manager executing on the first and second computer systems controls use of the interconnection messaging system to establish a dialog through which the transport protocol of the first computer system may be used by an application executing on the second computer system in a manner which is transparent to the application. The transport protocol executing on the first computer system may be utilized by a plurality of networked computer systems including the second computer system, where the interconnection messaging system establishes dialogs through which the transport protocol of the first computer system may be used by applications executing on the networked computer systems. Conversely, applications executing on the second computer system may utilize transport protocols executing on a plurality of networked computer systems including the first computer system.

Distributed transport communications manager with messaging subsystem for high-speed communications between heterogeneous computer systems

Methods and apparatus that enable network applications executing on respective directly interconnected computer systems to communicate at high speed, with low latency, over the interconnection therebetween such that both systems may use their native mechanisms to communicate with each other without change in those mechanisms, rather than over conventional network communication paths such as Ethernet. Communication between applications in co-resident, closely coupled processing environments is provided by replacing the conventional TCP transport layer and the conventional IP network layer with a reliable messaging subsystem (&ldquo;MSS&rdquo;) for data transfers between the closely coupled systems which provides an interface which is independent of the communication protocol of the interconnect and a virtual transport layer (&ldquo;VTL&rdquo;) which simulates a known transport layer protocol, such as TCP/IP, to the network applications. MSS is a system interconnect independent messaging transport which presents to its users many different delivery and notification mechanisms for the transfer of both control and data information between different heterogeneous environments, while VTL uses the MSS connection to provide a consistent, interconnect independent interface to the session layer.

Virtual transport layer interface and messaging subsystem for high-speed communications between heterogeneous computer systems

A high speed data communications method and system is provided whereby multiple groups of software interfaces are used to link a Distributed Systems Services Unit to a Network Provider which connects to an Input/Output Interface Module which relates to external interfaces of a Network. The interfaces permit the capability of buffer sharing and lock pool sharing, in addition to improved Connection Library Element Interfaces which reduce the overhead that was previously required and further enables faster data transfer operations with reduced latency.

Multiple interface data communication system and method utilizing

An Output Interface function for a Cooperative Service Interface which allows export of data from a Distributed System Services unit (DSS) to a Network Provider unit (NP) whereby lock pools are shared as well as buffer pools in each unit. Copying of exported data from said DSS to said NP is eliminated by use of an image buffer pool in said Network Provider (NP) (Which holds pointers to data in memory) and which can export the data to an external I/O port.

Output interface method and system for enhanced data transfers via

An Input Interface functions for a Cooperative Service Interface unit and enables data from a network to be placed in a designated input buffer of a Network Provider (NP) which can convey pointers to a Distributed System Service (DSS) unit's image buffer pool for access of the data by said DSS from memory. Sharing of buffer pools and lock pools lessen the overhead and latency which would normally burden such data transfers.

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Lansdale, PA, United States of America

Lois Bridgham Coyne