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ACPI
The server supports the Advanced Configuration and Power Interface
(ACPI) standard as defined by the ACPI 1.0b and PC97 specifications.
An ACPI-aware operating system can put the system into a state where
the hard drives spin down, the system fans stop, and all processing is
halted. However, the power supply will still be on and the processors
will still be dissipating some power, so the power supply fans will still
run.
The server supports sleep states s0, s1, s4, and s5:
• 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
will restore the system state from the disk and resume 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 CSB and the BMC are
running in this state. No context is saved by the operating system
or hardware.
Caution! The system is off only when the AC power cord is
disconnected.
AA G900 ug - EN.book Page 26 Wednesday, September 25, 2002 5:23 PM