IPMB

 

The intelligent platform management bus (IPMB) is the
monitoring and device management bus of
the OSTA 2.0 subrack. It connects all the devices in the OSTA 2.0 subrack.

The IPMB allows the SMM
to manage all the hardware in the subrack.
The IPMBs in each slot are connected in double-star mode. The IPMBs
in the fan box, power supply subrack, and other components are connected in
double-bus mode. The active and standby SMMs are connected through two IPMBs
for data synchronization.

Through
the connections between the IPMB buses and
the SMM, the system implements the monitoring and management functions of the
field replaceable unit (FRU), including detecting board temperature, voltage
and reset, fan in-position status and rotating speed, and PDB voltage and
current. When detecting an error, the intelligent platform management
controller (IPMC) in the FRU reports an alarm to the SMM.

The double-star and double-bus topology is
adopted for the IPMB connection.

The IPMBs work in
master/slave mode. The master bus sends messages, and the slave bus receives
messages. Each slot provides two IPMBs, and the 14 slots
totally provide 28 IPMBs. All the buses are connected to
the active and standby SMMs through the connector connected to the backplane

·    
The SWUA0 provides the following
management functions:

§ 
Providing an independent baseboard
management controller (BMC) module and a redundancy intelligent platform
management bus (IPMB). The BMC
reports the hardware status and alarms of the SWU to the SMM so that the SMM
can manage the SWU.

§ 
Managing the information about the
field replaceable units (FRUs), sensor data records (SDRs), and system event
logs (SELs)

§  The BMC is the core of the Intelligent Platform Management
Interface (IPMI) standard. It collects,
processes, and stores the signals of all the sensors, and monitors the
operating status of each component.

FRUs
refer to the units that can be replaced on site, such as the fan box, board,
daughter board, and PEM. FRU information refers to the information that is
stored in the non-volatile memories of the FRU, such as
the manufacturing information.

 

Very much informative...thanks for the post.

good

great presentation