Sun Microsystems Cobalt LX50, Руководство пользователя

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Chapter 4: Powering On and Configuring the Server
4-2 User Guide—Sun Cobalt LX50 Server
Pushing the switch sends a signal to monitoring circuitry inside the server. The switch does not directly control
high-voltage AC; it controls only low-voltage signals. When the monitoring circuitry detects that the button has been
depressed, it activates the power supply and powers up the server. Likewise, when the server is powered up, pushing
the switch powers the server down.
The main method for isolating the server from all high voltage is to physically remove the AC power cord. If the
power cord is not removed, the only other way to isolate the server from high voltage is to open all external circuit
breakers that supply AC voltage to the equipment.
Clearing CMOS
It may be necessary to clear CMOS memory in order to restore the default BIOS passwords required to boot the
server (user) or access setup functions (supervisor), as well as the default BIOS settings. To clear CMOS, follow these
steps:
1. Power down the server
2. Push and hold the reset button for at least four seconds
3. While continuing to depress the reset button, push the server power button to power up the server
4. After power has been applied, release the reset button
Booting Up
As soon as power is applied to the server, the bootup process begins. Boot messages are sent to either a monitor
attached to the video port, or to a serial console attached to the front or rear RJ-45 serial console ports.
The server is configured by default to initially send BIOS and kernel messages to both the serial console and the video
port. However, when the boot process reaches the Linux Loader (LILO) point, the messages and screens are sent only
to the video port. After bootup is finished, the configuration can be changed to send all messages to the serial console
(see “Configuring an External Serial Console” on page 4-7).
Boot Options
The first bootup screen is shown in Figure 36.
!
Caution: As shipped, the Sun Cobalt LX50 server does not have Advanced Configuration and
Power (ACPI) enabled in the Sun Linux™ 5.0 kernel and, as a result, the front panel power
switch operates as a normal power switch. In this configuration, press the switch once and
power comes on, press again and the power goes off. It is recommended that you use the
standard Sun Linux 5.0 shutdown command before you power down the system using the
switch. Activate the front panel switch to remove power only when Linux has completed the
shutdown process and has halted.
Should you elect to use an ACPI-enabled Linux kernel and run the ACPI daemon (acpid), the
behavior of the front panel switch will change to support the standard “soft-off” capability.
That is, when the server is on and the power switch is pressed, the OS is notified and begins a
graceful shutdown. Additionally, with ACPI enabled and the server on, pressing the power
button for longer than four seconds forces an immediate (non-graceful) shutdown.