52 CMF MONITOR CMFMON User Guide
IOQ
IOQ
[CLASS=TAPE|COMM|DASD|GRAPH|UNITR|CHRDR|CTC]
[,RANGE=(lcu1,lcu2,...lcua:lcub)]
Overview
Collects data on I/O queuing activity for all channel paths on the LCU(s) 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 for 3090 or ES/9000 systems, or in subtype 13
records for 4381 or 308x systems.
Note: I/O queueing data is available only when the CMF Extractor is active with the IOQ
statement in CPM mode.
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:
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.
Example 1
IOQ RANGE=06A
Collects data on the I/O queues existing for all devices attached to LCU 06A.
Example 2
IOQ CLASS=TAPE,RANGE=7B1
Collects data on the I/O queues existing for tape devices attached to LCU 7B1.
