Chassis Description 27
Server Management Summary The server board’s servermanagement architecture features a board management controller (BMC),
which autonomouslymonitors server status and provides the interface to server management
control functions. The BMC is responsible for controllingsystem power, resets, monitoring
voltages,temperatures, fans, and communicating with secondary controllers on its Intelligent
PlatformManagement Bus (IPMB).
The functions of each controllerare summarized in the following sections.
Server Board Management Controller
The BMC on the server board provides server managementmonitoring capabilities. Associated
with the BMC is a flash memorythat holds the operational code, sensor data records (SDR), and
systemevent log (SEL). A serial EEPROM holdsthe BMC configurationdefaults and field
replaceableunit (FRU) information. The BMC supports the following:
• Server board voltage monitoring
• Fan f ailure detection
• Fan speed control
• Processor voltage monitoring
• Processor presence detection
• Processor internal error (IERR) monitoring
• Fault resilient booting (FRB)
• Processor disable control
• Watchdog timer
• Periodic system management interrupt (SMI) timer
• I2C master controller for the Intelligent Platform Management Bus(IPMB)
• Three private I2C management bus interfaces
• Server management software (SMS) and server management mode (SMM) IPMB message
receiver
• Event message receiver
• System event log (SEL) management and access
• Sensor data record (SDR) repository management and access
• Processor nonmaskable interrupt (NMI) monitoring
• Processor SMI monitoring
• Ti me-stamp clock
• Secure mode, video blank, and floppy write protect
• Software front panel NMI generation