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User Guide
27
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ACPI
The motherboard supports the Advanced Configuration and Power Interface (ACPI) as
defined by the ACPI 2.0 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 system board supports sleep states s0, s1, s4, and s5:
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s0: Normal running state.
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s1: Processor sleep state. No context will be lost in this state and the processor
caches will maintain coherency.
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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.
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s5: Soft off: Only the RTC section of the CSB and the BMC are running in this
state. No context is saved by the OS or hardware.
Caution
The system is off only when the AC power cord is disconnected.
Remote Management Feature
Server management is concentrated in the ExpressScope. The ExpressScope and
associated circuitry are powered from a 5V DC standby voltage, which remains active
when system power is switched off, but the ac power source is still on and connected.
The ExpressScope supports Dianascope, which allows remote server management
through the network. Events monitored by the manager system include over-
temperature and over-voltage conditions, fan failure, or chassis intrusion.
Information on Dianascope may be found in the ExpressBuilder DVD-ROM.
One major function of the ExpressScope is to autonomously monitor system
management events, and log their occurrence in the nonvolatile System Event Log
(SEL). The events being monitored include overtemperature and overvoltage
conditions, fan failure, or chassis intrusion. To enable accurate monitoring, the
ExpressScope maintains the nonvolatile Sensor Data Records (SDRs), from which
sensor information can be retrieved. The ExpressScope provides an ISA host interface
to SCR sensor information, so that software running on the server can poll and retrieve
the server's current status.
The ExpressScope performs the following:
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Monitors server board temperature and voltage*