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Chapter 1 Controls, Ports, and Indicators
7
Connecting AC Power to Multiple-Server Configurations
The HP Netserver temporarily draws a large "inrush current" when first connected
to an AC power source. This also occurs when the Netserver is in a standby mode
(power is turned off, but the power cord is plugged into AC power). 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
thus prevent the servers from powering up.
When preparing your site for installation, allow for the additional inrush current.
Refer to Table A-1, "System Power Specifications," in Appendix A,
"Specifications."
Sleep States (ACPI)
The HP Netserver supports the ACPI (Advanced Configuration and Power
Management 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 power LED flashes slowly
and the fans continue to operate.
An additional sleep state supported by the Netserver is one 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 mentioned earlier, but the fans and
the 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.