Computer command and response for determining the state of an I/O operation
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United States of America Patent
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Mar 8, 2011
Issued Date -
N/A
app pub date -
Feb 14, 2008
filing date -
Feb 14, 2008
priority date (Note) -
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Abstract
A computer program product, apparatus, and method are provided for determining a state of an input/output (I/O) operation in an I/O processing system. A request from a channel subsystem is received at a control unit for performing the I/O operation. After a predetermined amount of time passes without the I/O operation completing, an interrogation request is received from the channel subsystem at the control unit for determining the state of the I/O operation. A response is sent from the control unit to the channel subsystem indicating the state of the I/O operation in response to the interrogation request. The response also includes information regarding a state of an I/O device executing the I/O operation and information indicating a state of the control unit controlling the I/O device executing the I/O operation.
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