Larry Richard Perry

US Patent:

6336194, Jan 1, 2002

Filed:

Oct 29, 1998

Appl. No.:

09/181966

Inventors:

Kirby G. Dahman - Tuscon AZ
Gavin S. Johnson - Aromas CA
Larry R. Perry - Gilroy CA
Harry M. Yudenfriend - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1100

US Classification:

714 17, 710 15

Abstract:

Repositioning within an input/output device is accomplished without any knowledge of where the input/output device is currently positioned. The input/output device is repositioned to a predetermined position, in order for a program to be retried. The predetermined position is determined from a previously executed program. The previously executed program is scanned looking for commands. For each command found, a position identifier is adjusted based upon the type of command. When the scan and adjustments are complete, the position identifier represents the predetermined position used for repositioning the input/output device.

US Patent:

6339799, Jan 15, 2002

Filed:

Oct 29, 1998

Appl. No.:

09/181744

Inventors:

Kirby G. Dahman - Tuscon AZ
Gavin S. Johnson - Aromas CA
Larry R. Perry - Gilroy CA
Harry M. Yudenfriend - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1314

US Classification:

710 21, 709203, 711147, 711157, 714 6

Abstract:

Repositioning within an input/output device is accomplished without any knowledge of where the input/output device is currently positioned. The input/output device is repositioned to a predetermined position, in order for a program to be retried. The predetermined position is determined from a previously executed program. The previously executed program is scanned looking for commands. For each command found, a position identifier is adjusted based upon the type of command. When the scan and adjustments are complete, the position identifier represents the predetermined position used for repositioning the input/output device.

US Patent:

6343335, Jan 29, 2002

Filed:

Oct 29, 1998

Appl. No.:

09/181704

Inventors:

Kirby G. Dahman - Tuscon AZ
Gavin S. Johnson - Aromas CA
Larry R. Perry - Gilroy CA
Harry M. Yudenfriend - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1314

US Classification:

710 21, 709203, 711147, 711157, 714 6

Abstract:

Repositioning within an input/output device is accomplished without any knowledge of where the input/output device is currently positioned. The input/output device is repositioned to a predetermined position, in order for a program to be retried. The predetermined position is determined from a previously executed program. The previously executed program is scanned looking for commands. For each command found, a position identifier is adjusted based upon the type of command. When the scan and adjustments are complete, the position identifier represents the predetermined position used for repositioning the input/output device.

US Patent:

6842825, Jan 11, 2005

Filed:

Aug 7, 2002

Appl. No.:

10/214842

Inventors:

Robert Vaughn Geiner - Raleigh NC, US
Ronald Maynard Kern - Tucson AZ, US
Gregory Edward McBride - Tucson AZ, US
William Frank Micka - Tucson AZ, US
Jeffrey Mark Nick - West Park NY, US
Larry Richard Perry - Gilroy CA, US
David B. Petersen - Great Falls VA, US
David Michael Shackelford - Tucson AZ, US
Harold Glen Slone - Los Gatos CA, US
Harry Morris Yudenfriend - Poughkeepsie NY, US
Douglas M. Zobre - Poughkeepsie NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1200
G06F 1216

US Classification:

711133, 711100, 711118, 711141, 711162, 707201, 707204, 714 6, 713501

Abstract:

In a system including a host, a primary storage subsystem coupled to the host, a cache coupled to the host and separate from the primary storage system, a secondary storage subsystem, and a data mover coupling the primary and secondary storage systems, data is temporarily cached for future storage in the primary storage subsystem so as to preserve timestamp information and maintain data consistency for asynchronously mirroring the data at a secondary subsystem.

US Patent:

7480697, Jan 20, 2009

Filed:

May 28, 2002

Appl. No.:

10/157461

Inventors:

Larry Richard Perry - Gilroy CA, US
Harold Glen Slone - Los Gatos CA, US
William Frank Micka - Tucson AZ, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/167

US Classification:

709213, 709214, 711 4

Abstract:

A method for sending a message from one host () to at least one other host, both of which are attached to a hardware subsystem () that is bidirectionally coupled to a mass data storage unit () includes (a) transferring a Send Message command through a channel () from a first attached host to the hardware subsystem, the Send Message command having at least one second attached host as an intended recipient; (b) buffering () at least a message payload portion of the Send Message command at the hardware subsystem and generating an unsolicited interrupt in the at least one second attached host; and (c) in response to the unsolicited interrupt, transferring a Request Message command through a channel from the at least one second attached host to the hardware subsystem for obtaining at least the message payload portion buffered at the hardware subsystem. The Send Message command may be a point-to-point message having a single other attached host as an intended recipient, or it may be a point-to-multipoint message having a plurality of other attached hosts as intended recipients. The hardware subsystem need have no knowledge of the message contents sent between hosts.

US Patent:

53882547, Feb 7, 1995

Filed:

Mar 27, 1992

Appl. No.:

7/858905

Inventors:

John F. Betz - Hyde Park NY
Allan S. Meritt - Poughkeepsie NY
Larry R. Perry - Gilroy CA
William C. Shepard - Hyde Park NY
Harry M. Yudenfriend - Wappingers Falls NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1100
G06F 1130
G06F 1134

US Classification:

395575

Abstract:

An I/O request time limit value is set in a request-based, device-based, data-set-based, or workload-based time limit field, for transactions performing I/O operations to I/O devices in a data processing system. A scan routine compares the total time for the I/O request (including waiting time and retry time) against the appropriate time limit(s), and terminates the I/O request if the time limit is exceeded. If an active I/O request is interrupted as a result of an I/O error, retry is prohibited if the total I/O request time (including retry time) exceeds the appropriate time limit, or is within a threshold value of the appropriate time limit.

US Patent:

54267617, Jun 20, 1995

Filed:

Dec 22, 1992

Appl. No.:

7/995276

Inventors:

Joel H. Cord - Tucson AZ
Susan K. Candelaria - Tucson AZ
Joseph S. Hyde - Tucson AZ
Larry R. Perry - Gilroy CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1316
G06F 1300

US Classification:

395425

Abstract:

A system for prestaging data into a cache to increase the speed data is received from a direct access storage drive (DASD) is utilized within a data processing system. This system utilizes multi-track read operations to prestage tracks into the cache. In so doing, the overhead associated with proceeding from one track to the next is reduced. The system allows for the prestaging of up to a cylinder of tracks per prestage. The prestaging system will also allow internally scheduled operations requiring a physical device to interrupt the prestaging if conditions require this action to maintain subsystem performance.

US Patent:

61990744, Mar 6, 2001

Filed:

Apr 5, 1999

Appl. No.:

9/286389

Inventors:

Robert Frederic Kern - Tucson AZ
William Frank Micka - Tucson AZ
Jeffrey Mark Nick - Fishkill NY
Larry Richard Perry - Gilroy CA
David Bradley Petersen - Great Falls VA
Harold Glen Slone - Los Gatos CA
Gail Andrea Spear - Tucson AZ
Harry Morris Yudenfriend - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1730

US Classification:

707204

Abstract:

A database management system ensures consistency between primary and mirrored backup copies of a database, despite occurrence of a suspending condition interrupting the normal process of mirroring the primary database. One or more primary controllers are provided, each having a data storage unit with multiple primary data storage devices. Multiple secondary controllers each have multiple associated secondary data storage devices, each secondary controller being coupled to one primary controller. One or more primary databases reside on the primary devices, with a corresponding number of secondary databases residing on the secondary devices. Each secondary database mirrors a corresponding primary database. Either a host, attached to a primary controller, or one of the primary controllers itself, maintains a map cross-referencing each primary and secondary database with the primary and secondary devices containing portions thereof. If a predefined "suspending condition" affecting data mirroring occurs, the host or primary controller consults its map to identify all primary and secondary devices affected by the condition.