future versions of Microsoft Windows NT† x that support ACPI, the BIOS will support 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 PIIX4 and the BMC are running in this state.

CAUTION

The system is off only when the AC power is disconnected.

Server Management

Server Management features are implemented using one microcontroller.

Baseboard Management Controller (BMC)

All server management functionality is concentrated in the BMC. The BMC and associated circuitry are powered from + 5V_Standby, which remains active when server power is switched off and the server is still plugged into AC power.

One major function of the BMC is to autonomously monitor system management events, and log their occurrence in the nonvolatile System Event Log (SEL). These include events such as overtemperature and overvoltage conditions, fan failure, or chassis intrusion. To enable accurate monitoring, the BMC maintains the nonvolatile Sensor Data Record (SDR), from which sensor information can be retrieved. The BMC provides an ISA host interface to SDR sensor information, so software running on the server can poll and retrieve the server's current status.

SEL contents can be retrieved after system failure, for analysis by field service personnel using server management software tools such as Intel Server Control available on the CD-ROM that ships with the L440GX+ server board or from the Intel Customer Support website:

http//support.intel.com/support/motherboards/server/l440gx

Because the BMC is powered by 5V_Standby, SEL and SDR information are also available via the IMB (Intelligent Management Bus). An Emergency Management Card, such as the

Intel® LANDesk® SMM (Server Monitor Module) card available with the LANDesk Server Manager Pro package, can obtain the SEL and make it remotely accessible using a LAN or telephone line connection. While it receives the proper current, the BMC does the following:

∙Monitors server board temperature and voltage

∙Monitors processor presence and controls FRB

∙Detects and indicates baseboard fan failure

∙Manages the SEL interface

∙Manages the SDR Repository interface

L440GX+ Server Board Product Guide

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