Bi-directional data transfer within a single I/O operation
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United States of America Patent
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Mar 29, 2016
Grant Date -
Mar 12, 2015
app pub date -
Nov 17, 2014
filing date -
Feb 14, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A computer program product, apparatus, and a method for facilitating input/output (I/O) processing for an I/O operation at a host computer system configured for communication with a control unit. The method includes receiving, by a control unit, a command block configured to hold a plurality of commands including an input command and/or an output command, the plurality of commands specified by a transport command word (TCW) including a read indicator configured to indicate whether the I/O operation includes input data and a write indictor configured to indicate whether the I/O operation includes output data; based on the command block holding at least one output command, receiving the output data and executing the at least one output command; and based on the command block holding at least one input command, forwarding the input data to the channel subsystem for storage at a location specified by the TCW.
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