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IOQ

IOQ
[CLASS=TAPE|COMM|DASD|GRAPH|UNITR|CHRDR|CTC]
[,RANGE=(lcu1,lcu2,...lcua:lcub)]

Related topic

Using-the-CMFMON-write-facility

Overview

This control statement collects data on I/O queuing activity for all channel paths on the LCUs that have experienced activity during the current CMF recording interval. If no operands are specified, data is collected for all LCUs that have had active channel paths during the current CMF recording interval.

Data is recorded in SMF79 subtype 14 records. I/O queuing data is available only when the CMF Extractor is active with the IOQ statement in CPM mode.

Parameters

This statement has the following parameters:

CLASS

limits the data collected to LCUs that serve the specified device class; the default is to collect data for all LCUs

Possible values are as follows:

  • TAPE
    magnetic tape devices
  • COMM
    communications devices
  • DASD
    direct access storage devices
  • GRAPH
    graphics devices
  • UNITR
    unit record devices
  • CHRDR
    character reader devices
  • CTC
    channel-to-channel adapters

RANGE

up to 32 LCUs or ranges of LCUs for which data is collected; the default is to collect data for all LCUs

Examples

IOQ RANGE=06A

Data is collected on the I/O queues existing for all devices attached to LCU 06A.

IOQ CLASS=TAPE,RANGE=7B1

Data is collected on the I/O queues existing for tape devices attached to LCU 7B1.





 

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