Earle H Jenner

US Patent:

46480315, Mar 3, 1987

Filed:

Jun 21, 1982

Appl. No.:

5/390163

Inventors:

Earle H. Jenner - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1200

US Classification:

364200

Abstract:

A programming method and structure for operating a computing system to restart a total subsystem or a subset of that subsystem to an operable state following a total interruptions (system failure or termination, either normal or abnormal). The subsystem isolates inoperable resources while permitting the others to resume by independently maintaining in a first structure recording the completion state of a resource manager's recovery responsibility with respect to each interrupted work unit and in a second structure the operational states and recovery log interest scopes of each resource manager. The completion state can be influenced by the starting or not of a resource manager, and if restarted, the presence or absence of a resource subset required to accomplish the work unit recovery.

US Patent:

55465820, Aug 13, 1996

Filed:

Feb 2, 1995

Appl. No.:

8/384484

Inventors:

Roger L. Brockmeyer - San Jose CA
Richard Dievendorff - Mountain View CA
Daniel E. House - Scarborough, CA
Earle H. Jenner - San Jose CA
Margaret K. LaBelle - Poughkeepsie NY
Michael G. Mall - LaGrangeville NY
Stuart L. Silen - Morgan Hill CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 2908

US Classification:

395650

Abstract:

An extension of the two phase commit protocol allows distributed participation among physically distant agents independent of the communications mechanism being used in a data processing system. An extra stage of processing is added to the two phase commit protocol called End Phase One Processing (EPOP) which enables a distribution of the coordinator function across systems using any communication mechanism. EPOP is an extra stage in which a participant can receive control. In this extra stage, a participant flows two phase commit protocol sequences to distributed systems. The communication mechanism is used in such a way that it becomes part of a distributed coordinator. The coordinator itself does not need knowledge of other systems. The extra stage of processing is enabled by an operating system service called Enable End Phase One Exit Processing (EEPOEP). EEPOEP causes an extension of two phase commit protocol to be used on the issuing system.