System Startup, Configuration, and Shutdown Reference Manual (32650-90892)

Chapter 9 179
Halting System Activity
9 Halting System Activity
A system shutdown does not imply turning off power to the computer hardware. Instead,
system shutdown means stopping the computer’s operating system. Stopping system
activity makes the computer inaccessible to users. You would need to shut down the
system for maintenance, for a physical move, for changing the system configuration, or for
security reasons.
If done properly, a shutdown preserves all system and user files. Before the shutdown
occurs, backlogged reports can be printed, or they can be saved to tape and replaced when
the system is running again.
The shutdown procedure usually consists of several steps, including the following:
• Telling users well in advance of a planned shutdown
• Warning users a few minutes before the shutdown
• Preventing anyone from starting a new job or session, or printing new reports
• Clearing the backlog of reports before the shutdown (This step is unnecessary unless
you need the space that these reports are using.)
• Answering any console requests
• Shutting open communication lines
• Aborting remaining jobs and sessions
• Entering the =SHUTDOWN command
The next several sections describe procedures associated with shutting down a system.
Read through the remainder of this chapter before attempting a shutdown based on these
instructions. Become familiar with the commands and options used in each process.
Examine the processes for areas that you may need to customize for your system.