Sleep Mode; Acpi - NEC EXPRESS5800/120Md Series User Manual

Sleep Mode

The SLEEP mode switch on the front of the server is used for saving power.
If the SLEEP mode switch is pressed, then the server enters into the sleep state (the
Drive Bay Power lamp and the Power lamp will blink simultaneously). In the power
saving mode, the memory data and the states of the jobs are kept unchanged. In
addition, the server in the power saving mode can accept accesses to hard disks from
other machines on the network and perform other network jobs.
Sleep mode requires an operating system that supports its function.
Note: Windows NT 4.0 does not support the Sleep mode
function.

ACPI

The Advanced Configuration and Power Interface (ACPI) aware operating system can
place the system into a state where the hard drives spin down, some system fans stop,
and all processing is halted. However, in this state the power supply is still on and the
processors are still dissipating some power such that the power supply fan and
processor fans are still running.
Note: ACPI requires an operating system that supports its
feature.
This server system BIOS supports sleep states s0, s1, s4, and s5. However, with future
versions of Microsoft Windows 9X that support ACPI, the system BIOS only supports
sleep states s0, s1, and s5. With future versions of Microsoft Windows NT that support
ACPI, the system BIOS will only support sleep states s0, s1, s4, and s5.
Only when the AC power is disconnected is the system completely
off.
The sleep states are defined as follows:
s0: Normal running state.
!
s1: Processor sleep state.
!
No context will be lost in this state and the processor caches will maintain
coherency.
s4: Hibernate or Save to Disk.
!
The memory and machine state are saved to disk. Pressing the power button or other
wakeup event restores the system state from the disk and resumes normal operation.
This assumes that no hardware changes have been made to the system while it was
off.
s5: Soft off.
!
Only the RTC section of the chip set and the BMC are running in this state.
1-26 System Overview
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