Control by means of system parameters

The system parameters are set in the startup parameter service and affect dump output throughout the system.

• A corresponding setting for the DUMPSEPA system parameter enables the output of protected memory areas (secret pages, see "Influence of page attributes") of the class 1 and class 6 memory to be suppressed.

• The output of privileged class 5 memory in area and user dumps can be controlled by setting the DUMPCL5P system parameter.

• The DUMPSD# system parameter defines how many system dumps per session are to be output without interaction from the operator.

• The following functions can be controlled using the DUMPCTRL system parameter:

  • detection of duplicates with system dumps (default: switched off)

  • unmanned operation (default: switched off)

  • output of the IDA0N99 message (default: switched off)

  • output of the IDA0N52 message (default: switched on)

  • use of the IOPERF= HIGH and IOUSAGE=WRITE operands in the FILE call for the dump output file (default: switched on)

• Output of class 6 memory in system dumps can be controlled using the DUMPSREF system parameter.

• The RDTESTPR system parameter defines the maximum read test privilege values.

  A read test privilege value of >= 3 is required in order to create a system dump from the processor state TU or to convert an area dump or user dump into a system dump.

• If the DESTLEV system parameter was set to >= 2, the dump files are created under the SYSDUMP and SYSUSER user IDs with the operand DESTROY-BY-DELETE=YES.

More detailed information on the possible values and operands for system parameters can be found in the “Introduction to System Administration” manual [6].