Processing of data to determine compatability in an input/output processing system
First Claim
1. A computer program product for processing communications between a control unit and a channel subsystem in an input/output processing system, comprising a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- sending a Request Node Identification (RNID) message from the channel subsystem to the control unit in a Command mode, wherein the Command mode uses a Fibre Connectivity (FICON) protocol supporting Channel Command Words (CCWs);
receiving a RNID response from the control unit, the RNID response comprising a Process Log-in (PRLI) indicator, the PRLI indicator indicating whether the control unit supports a PRLI message protocol;
responsive to the received PRLI indicator indicating a PRLI message protocol is not supported by the control unit, continuing operation in the Command mode;
responsive to the received PRLI indicator indicating the PRLI message protocol is supported by the control unit, sending a PRLI message to the control unit to determine whether the control unit supports a Transport mode, wherein the Transport mode supports Transport Command Control Blocks (TCCBs); and
responsive to the PRLI message determining that the control unit supports the Transport mode, setting the operational parameters for the Transport mode for that control unit.
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Accused Products
Abstract
A computer program product, an apparatus, and a method for processing communications between a control unit and a channel subsystem in an input/output processing system are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method including: sending a message from the channel subsystem to the control unit in a first mode; receiving a response from the control unit and determining from the response whether the control unit supports a message protocol; and responsive to the message protocol being supported by the control unit, sending another message using the message protocol from the channel subsystem to the control unit to determine whether the control unit supports a second mode.
184 Citations
20 Claims
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1. A computer program product for processing communications between a control unit and a channel subsystem in an input/output processing system, comprising a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
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sending a Request Node Identification (RNID) message from the channel subsystem to the control unit in a Command mode, wherein the Command mode uses a Fibre Connectivity (FICON) protocol supporting Channel Command Words (CCWs); receiving a RNID response from the control unit, the RNID response comprising a Process Log-in (PRLI) indicator, the PRLI indicator indicating whether the control unit supports a PRLI message protocol; responsive to the received PRLI indicator indicating a PRLI message protocol is not supported by the control unit, continuing operation in the Command mode; responsive to the received PRLI indicator indicating the PRLI message protocol is supported by the control unit, sending a PRLI message to the control unit to determine whether the control unit supports a Transport mode, wherein the Transport mode supports Transport Command Control Blocks (TCCBs); and responsive to the PRLI message determining that the control unit supports the Transport mode, setting the operational parameters for the Transport mode for that control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for processing communications in an input/output processing system, comprising:
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a channel subsystem of a host computer system in communication with a control unit capable of commanding and determining status of an I/O device, the channel subsystem performing; sending a Request Node Identification (RNID) message to the control unit in a Command mode, wherein the Command mode uses a Fibre Connectivity (FICON) protocol supporting Channel Command Words (CCWs); receiving a RNID response from the control unit, the RNID response comprising a Process Log-in (PRLI) indicator, the PRLI indicator indicating whether the control unit supports a PRLI message protocol; responsive to the received PRLI indicator indicating a PRLI message protocol is not supported by the control unit, continuing operation in the Command mode; responsive to the received PRLI indicator indicating the PRLI message protocol is supported by the control unit, sending a PRLI message to the control unit to determine whether the control unit supports a Transport mode, wherein the Transport mode supports Transport Command Control Blocks (TCCBs); and responsive to the PRLI message determining that the control unit supports the Transport mode, setting the operational parameters for the Transport mode for that control unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of processing communications between a control unit and a channel subsystem in an input/output processing system, the method comprising:
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sending a Request Node Identification (RNID) message from the channel subsystem to the control unit in a Command mode, wherein the Command mode uses a Fibre Connectivity (FICON) protocol supporting Channel Command Words (CCWs); receiving a RNID response from the control unit, the RNID response comprising a Process Log-in (PRLI) indicator, the PRLI indicator indicating whether the control unit supports a PRLI message protocol; responsive to the received PRLI indicator indicating a PRLI message protocol is not supported by the control unit, continuing operation in the Command mode; responsive to the received PRLI indicator indicating the PRLI message protocol is supported by the control unit, sending a PRLI message to the control unit to determine whether the control unit supports a Transport mode, wherein the Transport mode supports Transport Command Control Blocks (TCCBs); and responsive to the PRLI message determining that the control unit supports the Transport mode, setting the operational parameters for the Transport mode for that control unit. - View Dependent Claims (20)
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Specification