Statistical Data on the ERDS

EREP forces the MVS system to write statistical and usage data about your I/O devices to the ERDS when you request the following reports:

System summary
System exception series
Threshold summary
Trends report
Any report for which you have specified a device type (DEV) or ZERO=Y

The data comes from counters that are associated with the devices. The operating system dumps this data to the ERDS in the form of MDR and OBR records.

You can see the usage statistics for I/O devices by running a detail edit report and specifying the device type (DEV parameter in EREP Selection Parameters).