HP Netserver E Server series - Manual (Page 14)

Chapter 1 Controls, Ports and Indicators
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The NetServer 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, LAN activity, and scheduled events.
NOTE The HP NetServer’s power management policies (transitions
between various power states) and the user options are specific
to the particular ACPI-compliant NOS installed on the
NetServer. If your respective NOS is ACPI-compliant, refer to
the power management features in the instructions provided for
more information.
The HP NetServer’s power button can be configured to initiate a sleep state (Sleep
button), a "soft off", or graceful shutdown 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 NetServer’s
power button is capable of an override in case of a non-responsive NOS.
NOTE The HP NetServer power button will force a power down
without waiting for the NOS to gracefully shut down the
NetServer, if the power button is pressed and held in excess of
four seconds.
CAUTION If the power button override is used, there is a strong
possibility of corrupted or lost data.