HP TC2120 - Manual (Page 12)

6
Chapter 1 Controls and Indicators
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 are 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.
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.
Refer to the BIOS Setup Utility in Chapter 3‚ Installing and Configuring and your NOS documentation for
instructions on setting up Sleep States and transitioning into and out of the various states.
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.
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 five seconds.
CAUTION If the power button override is used, there is a strong
possibility of corrupted or lost data.