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Facilitating transport mode data transfer between a channel subsystem and input/output devices

  • US 8,918,542 B2
  • Filed: 03/15/2013
  • Issued: 12/23/2014
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A computer program product for performing an input/output (I/O) operation initiated by an I/O operation instruction at a host computer system configured for communication with a control unit, the computer program product comprising:

  • a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing;

    receiving, by the control unit, a transport mode command message from a channel subsystem of the host computer system, the command message include a command for data to be transferred between the host computer system and an I/O device controlled by the control unit; and

    sending a command retry message to the channel subsystem, the command retry message including a request that the command message be re-sent to the control unit.

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