Sun Microsystems Fire 880, Руководство пользователя

Страница: 31 / 236

Chapter 1 System Overview 13
Security Keyswitch
The four-position security keyswitch controls the power-on modes of the system and
prevents unauthorized users from powering off the system or reprogramming
system firmware. The following table describes the function of each keyswitch
setting.
Position Icon Description
Normal This setting enables the system Power button to power the
system on or off. If the operating system is running, pressing
and releasing the Power button initiates a graceful software
system shutdown. Pressing and holding the Power button in
for five seconds causes an immediate hardware power off.
Locked The Locked setting:
• Disables the system Power button to prevent unauthorized
users from powering the system on or off
• Disables the keyboard Stop-a command, terminal Break key
command,
~# tip
window command, and RSC
break
command, preventing users from suspending system
operation to access the system
ok
prompt
• Prevents unauthorized programming of the system flash
PROMs
The Locked position is the recommended setting for normal
day-to-day operations.
Diagnostics This setting forces the power-on self-test (POST) and
OpenBoot
™
Diagnostics to run during system startup. The
Power button functions the same as when the keyswitch is in
the Normal position.
Forced Off This setting forces the system to power off immediately and
enter 5-volt standby mode. It also disables the system Power
button. You may want to use this setting when AC power is
interrupted and you do not want the system to restart
automatically when power is restored. With the keyswitch in
any other position, if the system was running prior to losing
power, it restarts automatically once power is restored.
The Forced Off setting also prevents an RSC console from
restarting the system. However, the RSC card continues to
operate using the system’s 5-volt standby power.