BI-DIRECTIONAL DATA TRANSFER WITHIN A SINGLE I/O OPERATION
First Claim
1. A computer program product 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 computer program product comprising:
- a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising;
forwarding the I/O operation to the control unit for execution;
gathering output data from a location of the output data specified by a transport command word (TCW);
forwarding the output data to the control unit for use in the execution of the I/O operation;
receiving input data from the control unit; and
storing the input data at a location specified by the TCW for storing the input data.
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Accused Products
Abstract
An article of manufacture, 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 the host computer system obtaining a transport command word (TCW) for an I/O operation having both input and output data. The TCW specifies a location of the output data and a location for storing the input data. The host computer system forwards the I/O operation to the control unit for execution. The host computer system gathers the output data responsive to the location of the output data specified by the TCW, and then forwards the output data to the control unit for use in the execution of the I/O operation. The host computer system receives the input data from the control unit and stores the input data at the location specified by the TCW.
98 Citations
37 Claims
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1. A computer program product 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 computer program product comprising:
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a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising; forwarding the I/O operation to the control unit for execution; gathering output data from a location of the output data specified by a transport command word (TCW); forwarding the output data to the control unit for use in the execution of the I/O operation; receiving input data from the control unit; and storing the input data at a location specified by the TCW for storing the input data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 23, 24, 25, 26, 35)
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9. An apparatus for providing bi-directional data transfer within a single I/O operation, comprising:
a host computer I/O subsystem comprising a channel adapter, the channel adapter configured to communicate with a control unit, the host I/O subsystem configured to perform a method comprising; gathering output data from a location of the output data specified by a transport command word (TCW); forwarding the I/O operation and the output data and to the control unit for execution; receiving input data from the control unit; and storing the input data at a location specified by the TCW for storing the input data. - View Dependent Claims (10, 11, 12, 13, 14, 27, 28, 29, 30, 36)
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15. A method for facilitating I/O processing for an I/O operation at a host computer system configured for communication with a control unit, the method comprising:
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gathering output data from a location of the output data specified by a transport command word (TCW); forwarding the I/O operation and the output data to the control unit for execution; receiving input data from the control unit; and storing the input data at a location specified by the TCW for storing the input data. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 31, 32, 33, 34, 37)
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Specification