Mark W Mcclintock

US Patent:

6954784, Oct 11, 2005

Filed:

Mar 4, 2002

Appl. No.:

10/087853

Inventors:

Alfred Bundgaard Christensen - Raleigh NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F015/177

US Classification:

709220, 709238, 709239

Abstract:

Cluster-wide port assignments in a workload distribution system in a cluster of data processing systems are provided such that a unique port may be provided for a socket. Establishing ports associated with workload distribution is also provided by allowing either enumerated ports and/or all ports of a common IP address to be associated with workload distribution. Workload distribution is provided in a cluster of data processing systems where a single IP address may be associated with a plurality of data processing systems and/or protocol stacks in the cluster of data processing systems and a port of the single IP address may be shared among multiple data processing systems and/or protocol stacks or may be unique among the plurality of data processing systems and/or protocol stacks.

US Patent:

6996617, Feb 7, 2006

Filed:

Aug 17, 2000

Appl. No.:

09/640412

Inventors:

Alfred Bundgaard Christensen - Raleigh NC, US
Wesley McMillan Devine - Apex NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/16
H04L 12/66

US Classification:

709227, 709230, 709203, 370352, 37039552, 3703952

Abstract:

Methods, systems and computer program products provide for transferring a virtual Internet Protocol address (VIPA) between communication protocol stacks including at least a first communication protocol stack and a second communication protocol stack. Ownership of the VIPA is established at the second communication protocol stack and connections to the first communication protocol stack utilizing the VIPA are maintained. TCP/IP messages for the connections to the first communication protocol stack are routed through the second communication protocol stack so as to non-disruptively move the VIPA from the first communication protocol stack to the second communication protocol stack.

US Patent:

6996631, Feb 7, 2006

Filed:

Aug 17, 2000

Appl. No.:

09/640409

Inventors:

Alfred Bundgaard Christensen - Raleigh NC, US
Wesley McMillan Devine - Apex NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/173

US Classification:

709242, 709238, 709239, 709220

Abstract:

Methods, systems and computer program products provide communications with a plurality of application instances using a plurality of communication protocol stacks and a single Internet Protocol (IP) address. A stack is established as a routing stack associated with the single IP address. Other stacks which are associated with the single IP address are defined as candidate target stacks and an identification of candidate target stacks and the routing stack is distributed to the stacks. The routing stack is notified when an application associated with a candidate target stack listens to a port of the IP address to establish a current actual target stack. A request to establish a connection to the IP address and the port of the IP address is received and a routing table entry corresponding to the current actual target stack is created to provide a routing path from the routing stack to the current actual target stack. Communications to the port of the IP address received by the routing stack are routed based on the routing table.

US Patent:

7120697, Oct 10, 2006

Filed:

May 22, 2001

Appl. No.:

09/862968

Inventors:

Wesley McMillan Devine - Apex NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US
Raymond E. Ward - Durham NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 13/00

US Classification:

709229, 709226, 709228, 709249

Abstract:

Methods, systems and computer program products provide assignment of ports for connections originated by multiple application instances executing on different data processing systems utilizing a common network address. An indication of available ports for the common network address is provided to each of the different data processing systems executing the multiple application instances. A port identified as available is selected as a port for a connection utilizing the common network address.

US Patent:

7430611, Sep 30, 2008

Filed:

Jan 28, 2005

Appl. No.:

11/045633

Inventors:

Alfred Bundgaard Christensen - Raleigh NC, US
Wesley McMillan Devine - Apex NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/173

US Classification:

709238, 709242

Abstract:

Methods, systems and computer program products provide communications with a plurality of application instances using a plurality of communication protocol stacks and a single Internet Protocol (IP) address. A stack is established as a routing stack associated with the single IP address. Other stacks which are associated with the single IP address are defined as candidate target stacks and an identification of candidate target stacks and the routing stack is distributed to the stacks. The routing stack is notified when an application associated with a candidate target stack listens to a port of the IP address to establish a current actual target stack. A request to establish a connection to the IP address and the port of the IP address is received and a routing table entry corresponding to the current actual target stack is created to provide a routing path from the routing stack to the current actual target stack. Communications to the port of the IP address received by the routing stack are routed based on the routing table.

US Patent:

7562145, Jul 14, 2009

Filed:

Aug 28, 2003

Appl. No.:

10/650944

Inventors:

Sue Huang - Raleigh NC, US
Mark William McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/177
G06F 15/173
G06F 15/16
G06F 11/00

US Classification:

709227, 709220, 709221, 709223, 709228, 714 1, 714 2, 714100

Abstract:

Connections from a client to respective ones of a plurality of application instances that receive data from a shared communication protocol stack are assigned by defining an affinity between the client and a corresponding one of the plurality of application instances. Connection requests received from the client at the shared communication protocol stack are assigned to the corresponding one of the plurality of application instances if an affinity is defined between the client and the corresponding one of the plurality of application instances. Connection requests received from the client at the shared communication protocol stack are distributed to selected ones of the plurality of application instances if an affinity is not defined between the client and the corresponding one of the plurality of application instances.

US Patent:

20020143954, Oct 3, 2002

Filed:

Apr 3, 2001

Appl. No.:

09/825122

Inventors:

John Aiken - Raleigh NC, US
John Brooks - Lake Katrine NY, US
Wesley Devine - Apex NC, US
David Herr - Apex NC, US
Susan Kimmel - Wappingers Falls NY, US
Mark McClintock - Raleigh NC, US

International Classification:

G06F015/16

US Classification:

709/227000, 709/203000

Abstract:

Methods, systems and computer program products are provided for distributing Transport Control Protocol (TCP) connections to a specific data processing system in a cluster of data processing systems by establishing a TCP connection between a client and a first data processing system in the cluster of data processing systems. The information is obtained from the client over the TCP connection to the first data processing system. The information obtained over the TCP connection to the first data processing system is evaluated to select a target data processing system in the cluster of data processing systems for the TCP connection. The TCP connection is transferred from the first data processing system to the selected target data processing system. The transfer of the TCP connection is transparent to the client.

US Patent:

6941384, Sep 6, 2005

Filed:

Aug 17, 2000

Appl. No.:

09/640438

Inventors:

Alfred Bundgaard Christensen - Raleigh NC, US
Wesley McMillan Devine - Apex NC, US
David Anthony Herr - Apex NC, US
Mark W. McClintock - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F015/16
G06F011/00

US Classification:

709250, 709227, 714 4

Abstract:

Methods, systems and computer program products provide for recovery from a failure of a primary routing communication protocol stack which routes communications over connections to a virtual Internet Protocol address (VIPA) and at least one port associated with the VIPA to a plurality of other communication protocol stacks associated by the primary routing stack and with the VIPA and the at least one port. At least one backup routing communication protocol stack is identified. The backup routing stack stores an identification of stacks associated with the VIPA and the at least one port as candidate target stacks. Messages are received at the backup routing stack identifying stacks having application instances bound to the VIPA and listening on the at least one port as current actual target stacks. Connections to the VIPA and the at least one port for current actual target stacks are also identified and a routing table constructed from the received messages so as to provide routing path information to current actual target stacks associated with the connection. Messages on the connections to the VIPA and the at least one port are routed through the backup stack utilizing the constructed routing table.