HP ProLiant ML150 Operation Manual page 14

Controls and Indicators
The HP server's power switch can be configured to initiate a graceful shutdown of the NOS
rather than an immediate shutdown of the power supply. The power switch 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 switch
is capable of an override in case of a non-responsive NOS.
NOTE: The HP server power switch will force a power-down without waiting for the NOS to gracefully
shut down the server, if the power switch is pressed and held more than four seconds.
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HP CONFIDENTIAL Codename: Stone Soup Part Number: 343329-001 Last Saved On: 8/14/03 10:01 AM
CAUTION: If the power switch override is used, there is a strong possibility that data will be
corrupted or lost.
HP ProLiant ML150 Server Operations and Maintenance Guide