System Startup, Configuration, and Shutdown Reference Manual (32650-90907)

Chapter 9
Halting System Activity
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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.