Technical data

Starting Up and Shutting Down the System
4.8 Shutting Down the System
• Writes the modified page list back to disk. This ensures that all writable
section files are updated to their correct state before the system crashes and
all in-memory data is lost.
• Unless the logical name OPC$NODUMP is defined, creates a crash dump
by writing physical memory to the system dump file. For more information
about the system dump file, see Section 16.1.
In an emergency, if you cannot invoke SHUTDOWN.COM, you can run the
OPCCRASH.EXE program to shut down your system immediately without
performing any of the housekeeping functions that ensure an orderly shutdown.
Note
Run the OPCCRASH.EXE program directly only if SHUTDOWN.COM
fails.
How to Perform This Task
To run the OPCCRASH.EXE program directly, you must have the CMKRNL
privilege. You can enter the commands from any terminal and any privileged
account. Follow these steps:
1. Log in to any privileged account.
2. Enter the following command:
$ RUN SYS$SYSTEM:OPCCRASH
3. If the system fails to respond after a few minutes, use the CRASH procedure
or, if your system does not have a CRASH procedure, enter the emergency
shutdown commands described in one of the following manuals:
• On VAX systems, refer to the most recent versions of the OpenVMS
VAX Upgrade and Installation Manual and the upgrade and installation
supplement for your VAX computer.
• On Alpha systems, refer to the most recent version of the OpenVMS
Alpha Upgrade and Installation Manual.
4. A message similar to the following one is displayed at the console:
SYSTEM SHUTDOWN COMPLETE
On VAX systems, the following message is also displayed:
USE CONSOLE TO HALT SYSTEM
Halt the system when you see this message.
Example
The following example runs the OPCCRASH program to force a system crash,
and halts the system:
$ RUN SYS$SYSTEM:OPCCRASH
SYSTEM SHUTDOWN COMPLETE
Ctrl/P
>>>HALT
HALTED AT 8000708A
Starting Up and Shutting Down the System 4–31