6. DATA SOURCES › 6.2 Record Descriptions › 6.2.6 Miscellaneous Data Record (MDR)

6.2.6 Miscellaneous Data Record (MDR)

The miscellaneous data record contains error and usage data
from buffered control units or communications controllers, or
device failures on teleprocessing (TP) devices connected to a
communications controller.

The following events cause an MDR record to be written:

    o Overflow of the statistical counters in a buffered
      control unit

    o Overflow of the NCP counter in a communications
      controller

    o TP device failure

    o DASD volume demounts

    o Operator-initiated EOD (End of Day) or ROD (Record on
      Demand), or VARY OFFLINE commands

    o Some invocations of EREP, which force the writing of
      statistical data to the ERDS

The record types are 90 and 91.