Specifications

Chapter 2. System Training
24 Dim11
Booting Up the System – Unix
The term “booting up the system” simply means turning on the CPU. It is taken
from the phrase “pulling yourself up by your own bootstraps”. It starts a process
which automatically checks the computer’s memory, sets all standard defaults and
comes to the login screen on the system monitor and peripheral terminals. There
are 2 methods of booting up the system, a “cold” boot and a “warm” boot.
“Cold” Boot (aka “hard” boot)
1 All users should be signed off the system before performing a cold boot.
2 Make sure the system monitor is also signed off and is displaying the login screen.
3 Turn off the power switch to the CPU (the “red” or “white” switch). This is not the
power switch to the system monitor. It is the power switch to the main computer
system.
4 Allow the machine to come to complete silence. Fans, spinning disks, etc. must be
fully disengaged.
5 Turn on the power switch to the CPU. Wait while the diagnostics take place
automatically.
6 The boot process is completed after the system monitor displays the login screen.
See the next section, PASSWORDS - Unix.
“Warm” Boot (aka “soft” boot)
1 The same conditions apply as in the cold boot. All users should be signed off the
system before performing a warm boot.
2 At the system monitor, log in as root.
3 Type one of the following commands:
(AIX)
shutdown +0 -r
(SCO) shutdown -g0 -y
NOTE: Make sure you type the zero (0) character and not the letter O.
4 The boot process is completed after the system monitor displays the login screen.
See the next section, PASSWORDS - Unix.
IMPORTANT: No users should sign on other terminals until the system monitor displays the
password screen. If a user signs on before the boot is complete, it will be necessary to
reboot the system again.
.
..
. REMEMBER:
A “cold” boot means to turn off the CPU and turn it back on again.
A “warm” boot means to enter the command shutdown +0 –r for AIX or shutdown g0 –y for
SCO under the root directory.
Do not sign on until after the system monitor is at the login screen.