SYSTEM_CHECK

   SYSTEM_CHECK investigates intermittent system failures by
   enabling a number of run-time consistency checks on system
   operation and recording some trace information.

   Enabling SYSTEM_CHECK causes the system to behave as if the
   following system parameter values are set (although the values
   of the following parameters are not actually changed):

   Parameter        Value         Description

   BUGCHECKFATAL    1             Crash the system on nonfatal
                                  bugchecks.

   POOLCHECK        %X616400FF    Enable all poolchecking, with
                                  an allocated pool pattern
                                  of %x61616161 ('aaaa') and
                                  deallocated pool pattern of
                                  x64646464 ('dddd').

   MULTIPROCESSING  2             Enable full synchronization
                                  checking.

   While SYSTEM_CHECK is enabled, the previous settings of the
   BUGCHECKFATAL and MULTIPROCESSING parameters are ignored.
   However, setting the parameter POOLCHECK to a nonzero value
   overrides the setting imposed by SYSTEM_CHECK.

   Setting SYSTEM_CHECK creates certain image files that are capable
   of the additional system monitoring. These image files are
   located in SYS$LOADABLE_IMAGES and can be identified by the
   suffix _MON. For information about the type of data checking
   performed by SYSTEM_CHECK, see the description of the ACP_
   DATACHECK parameter. For information about the performance
   implications of enabling SYSTEM_CHECK, see OpenVMS Performance
   Management.