Owner manual

Chapter 1 Controls, Ports and Indicators

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.

Refer to Table A-1, "Power Supply Specifications" in Appendix A,

"Specifications."

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.