08108570 cites 174 patents.

A state of an input/output (I/O) operation in an I/O processing system is determined. A request for performing the I/O operation is received from an I/O operating system at a channel subsystem and forwarded to a control unit controlling an I/O device for executing the I/O operation. After a predetermined amount of time passes without receiving indication from the control unit that the I/O operation is completed, an interrogation request is received at the channel subsystem from the I/O operating system for determining the state of the I/O operation. An interrogation command is sent from the channel subsystem to the control unit. A response is received from the control unit, the response indicates a state of the I/O device executing the I/O operation, a state of the control unit controlling the I/O device executing the I/O operation, and the state of the I/O operation being executed.

Title
Determining the state of an I/O operation
Application Number
12/30989
Publication Number
8108570 (B2)
Application Date
February 14, 2008
Publication Date
January 31, 2012
Inventor
Scott M Carlson
Tucson
AZ, US
Catherine C Huang
Poughkeepsie
NY, US
Ugochukwu C Njoku
Yonkers
NY, US
Gustav E Sittmann
Tucson
AZ, US
Roger G Hathorn
Tucson
AZ, US
Louis W Ricci
Hyde Park
NY, US
Dale F Riedy
Poughkeepsie
NY, US
Matthew J Kalos
Tucson
AZ, US
John R Flanagan
Poughkeepsie
NY, US
Daniel F Casper
Poughkeepsie
NY, US
Harry M Yudenfriend
Poughkeepsie
NY, US
Agent
John Campbell
Cantor Colburn
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 3/00
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