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Emulation of extended input/output measurement block facilities

  • US 7,600,053 B2
  • Filed: 12/28/2007
  • Issued: 10/06/2009
  • Est. Priority Date: 05/12/2003
  • Status: Active Grant
First Claim
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1. A method for obtaining a block of I/O measurement data, the method comprising:

  • emulating the execution of a modify subchannel instruction, in the emulated execution storing a measurement block address for a subchannel of a channel subsystem, the measurement block address directly specifying a location in memory of a measurement block assigned to the subchannel;

    obtaining measurement data, the measurement data related to the performance of an I/O operation of the subchannel, the measurement data comprising device busy time, wherein device busy time is the sum of time intervals when a subchannel is device busy during an attempt to initiate any one of a start function or a resume function at the subchannel;

    storing the obtained measurement data comprising the device busy time in the measurement block specified by the measurement block address, the measurement block comprising a device busy time field.

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