Facilitating transport mode input/output operations between a channel subsystem and input/output devices
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United States of America Patent
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Jan 14, 2014
Grant Date -
Sep 19, 2013
app pub date -
Feb 28, 2013
filing date -
Jun 30, 2011
priority date (Note) -
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Abstract
A method of performing an input/output operation includes: generating by a channel subsystem at least one command message including one or more device command words (DCWs), at least one DCW including a data count and a suppress-length indication (SLI) configured to instruct a control unit whether to continue to perform the I/O operation in response to an incorrect length condition; forwarding the at least one command message to the control unit; receiving an incorrect length (IL) value from the control unit and storing an IL indicator in a subchannel-status word, the IL indicator representing the IL value, the IL value being a first IL value in response to a first SLI value and the data count not matching the amount of data required, the IL value being a second IL value in response to a second SLI value and the data count not matching the amount of data required.
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