Service manual

Chapter 1 General Information
5
2. Press the power switch on the HP Netserver control panel when prompted by the operating
system.
Normally this completes the power-down procedure.
Connecting AC Power to Multiple-Server Configurations
The HP Netserver temporarily draws a large "inrush current," when first connected to an AC power source.
The inrush current is much greater than the Netserver's normal operating current and generally, the AC
power source can handle the normal inrush current.
However, if you install several HP Netservers on one circuit, precautions are necessary. If there is a power
failure and power is then restored, all the servers immediately begin to draw inrush current at the same time.
If the circuit breakers on the incoming power line have insufficient capability, the breaker may trip and
prevent the servers from powering up. When preparing your site for installation, allow for the additional
inrush current.
Sleep States (ACPI)
The HP Netserver supports the ACPI (Advanced Configuration and Power Interface) standard, which is a key
component of a NOS's directed power management. The supported features are only available when an
ACPI-compliant NOS is installed on the Netserver. The term “sleep state” refers to any of several reduced
power consumption states in which normal NOS activity has ceased.
The Netserver 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 Netserver appears to be off. The monitor appears blank and
there is no CD-ROM or SCSI hard drive activity, however, the front panel power LED flashes slowly and the
fans continue to operate.
The Netserver also supports another sleep state with a slower wake-up time, sometimes referred to as
“hibernate” by various operating systems. In this sleep state, the Netserver appears to be off as described
earlier, but the fans 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 Netserver’s NOS state (open
applications, screens, and so on) is saved to disk before the Netserver is placed in the sleep state. Upon
wake-up, this information must be restored from disk. This method of restoring the Netserver's operation is
much faster than a complete rebooting of the Netserver. 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 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 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 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.