HP Tc2100 - Server - 128 MB RAM Installation Manual page 20

Chapter 2
the Server. The term "sleep state" refers to any of several reduced power
consumption states in which normal NOS activity has ceased.
The Server supports several sleep states. One of these is a "standby" or "suspend"
sleep state, which has a short wake-up time. In this sleep state the Server appears
to be off – the monitor appears blank and there is no CD-ROM, internal hard drive
activity (IDE or SCSI), however, the power LED is a steady orange and the system
fan continues to operate.
The Server also may support another sleep state with a slower wake-up time,
sometimes referred to as "hibernate" by various operating systems. In this sleep
state, the Server appears to be off as described earlier, but the system fan and the
front panel power LED are also turned off. The unique feature of this sleep state
(and the reason for its slower wake-up time) is that information about the Server's
NOS state (open applications, screens, and so on) is saved to disk before the
Server is placed in the sleep state. Upon wake-up, this information is restored from
disk. This method of restoring the Server's operation is much faster than a
complete rebooting of the Server. It still requires running all the start-up self-tests
before starting the NOS, but loading the NOS and all the previously opened
applications is much faster.
The Server supports certain types of system activity, which is used as wake-up
events from these sleep states. These wake-up events can be generated from the
power button, keyboard or mouse activity, and scheduled events.
NOTE The HP Server's power management policies (transitions
between various power states) and the user options are specific
to the particular ACPI-compliant NOS installed on the Server.
If your NOS is ACPI-compliant, refer to the (BIOS) Setup
Utility and the power management features provided in the
NOS instructions for more information.
The HP Server's power button can be configured to initiate a graceful shutdown or
"soft off" of the NOS rather than an immediate shutdown of the power supply. The
power button configurations are dependent on the user interface provided by the
ACPI-compliant NOS. While power management is under the control of the
ACPI-compliant NOS, the HP Server's power button is capable of an override in
case of a non-responsive NOS.
NOTE The HP Server power button will force a power down without
waiting for the NOS to gracefully shut down the Server, if the
power button is pressed and held for more than four seconds.
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Controls, Ports and Indicators