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Providing extended measurement data in an I/O processing system

  • US 8,001,298 B2
  • Filed: 02/14/2008
  • Issued: 08/16/2011
  • Est. Priority Date: 02/14/2008
  • Status: Active Grant
First Claim
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1. An article of manufacture comprising at least one computer usable medium having computer readable program code logic to provide extended measurement word data from a control unit to a channel subsystem of an input/output (I/O) processing system, the computer readable program code logic for performing a method comprising:

  • receiving a command message from the channel subsystem at the control unit, wherein the command message is a transport command information unit message including a transport command control block (TCCB), the TCCB including at least one device control word (DCW) and having a location identified by a transport control word (TCW);

    initiating at the control unit a timing calculation sequence of a plurality of time values in response to receiving the command message at the control unit;

    storing the plurality of time values as extended measurement word data at the control unit in a response message; and

    outputting the response message including the extended measurement word data from the control unit to the channel subsystem.

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