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.

Title
Processing of data to determine compatability in an input/output processing system
Application Number
12/030981
Publication Number
20090210884
Application Date
February 14, 2008
Publication Date
August 20, 2009
Inventor
Harry M Yudenfriend
Poughkeepsie
NY, US
Gustav E Sittmann
Webster Groves
MO, US
Matthew J Kalos
Tucson
AZ, US
Catherine C Huang
Poughkeepsie
NY, US
Roger G Hathorn
Tucson
AZ, US
John R Flanagan
Poughkeepsie
NY, US
Daniel F Casper
Poughkeepsie
NY, US
Scott M Carlson
Tucson
AZ, US
Mark P Bendyk
Hyde Park
NY, US
Louis W Ricci
Hyde Park
NY, US
Agent
Cantor Colburn IBM Poughkeepsie
CT, US
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 13/00
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