Data General AViiON 4600 Series, Customer Documentation

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Starting and Stopping the Computer System
3-8
014–002091
Shutting Down Your Computer System
Each time you turn off the computer system, you must complete a sequence of
shutdown procedures to ensure that data is not lost and that you leave the hardware in
the proper state. It is important to bring down your software and turn power off to
your computer and peripherals in the correct order.
This section describes the various ways you can shut down your computer system. If
your AViiON computer system provides resources for other computers, you probably
won't shut it down very often. If you use your computer system as a stand-alone
station or as a network client to a server system, however, you are likely to start it at
the beginning of each work day and shut it down at the close of the day. Once you
become familiar with powerdown, reset, and restart procedures, you won't need to
follow the steps in this section to shut down or reset your computer system.
Powering Down
Follow these steps when shutting down the computer system entirely; for instance, at
the close of the day, when the computer system won't be used for a long period, or
when you plan any kind of hardware maintenance tasks. You may also want to power
down if your computer system is experiencing intermittent errors; often the process of
restoring hardware components to the powerup state resolves temporary problems, or
identifies problems that are not temporary.
CAUTION: Never turn off power to your computer system before properly shutting
down your operating system software. Resetting or cycling power to your
computer while the operating system is running may result in lost data.
1. Shut down your applications and operating system software according to the
procedures in your operating system documentation. For a DG/UX system, the
sequence to
immediately shut down the operating system is as follows:
2. Once you see the SCM prompt, you can safely turn off power to the computer
unit by pressing the computer unit's power switch.
3. If you have a Peripheral Housing Unit (PHU), Combined Storage Subsystem
Deskside Chassis (CSS/DC) or another external storage device connected to your
computer system, turn off power to the external unit.
4. If you have a printer or other device connected to your computer system, turn off
power. Make sure you turn off power to each device.
5. Turn off power to the monitor or asynchronous terminal.
6. Wait at least a minute before attempting to restart your computer system. Listen
for the computer unit fan; do not turn power back on until you hear that the fan
has stopped spinning.