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NetStructure™ MPCHC5525 System Master Processor Board IPMI Reference Driver User’s Guide 17
IBMU Functionality
The connection via ICMB is useful for maintenance purposes. If, for example, the CPU board in
one chassis hangs, the BMC in the other chassis can read the log file of the affected BMC via
ICMB.
Another application is the monitoring and controlling of nonintelligent devices. If the CPU board
the BMC is located on hangs or is in stand-by mode, the BMC in another chassis can request sensor
data of the nonintelligent device via ICMB and the command “Master Write-Read I
2
C”.
The following section provides a simple communication example. The example supposes that a
nonintelligent fan module located in chassis 1 and connected via IPMB1 to the BMC in chassis 1
(BMC1) is monitored and managed by the BMC in chassis 2 (BMC2).
The communication procedure is as follows:
Figure 9. Intelligent Chassis Management Bus (ICMB)
Figure 10. Fan without IPMI Controller Monitored via ICMB