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Chapter 1 System Overview 1-23
1.3.4 FAN Unit
The FAN unit is used to cool the server, and has the following features:
■ A redundant fan configuration enables continuous system operation even if a fan
fails during system operation.
■ Active (hot) system maintenance or replacement of a faulty FAN unit can be
performed during system operation.
1.3.5 Power Supply Unit
The power supply unit (PSU) feeds power to each unit, and has the following
features:
■ A redundant configuration enables the system operation to continue without
interruption even if a PSU fails during system operation.
■ Active (hot) system maintenance or replacement of a faulty PSU can be performed
during system operation.
1.3.6 Crossbar Unit
The crossbar unit (XBU) consists of crossbar switches that logically connect CMUs
and IOUs.
The XBU has redundant bus routes. If one route fails, the system can be restarted
through the other route to continue operation.
1.3.7 Clock Control Unit
The clock control unit (CLKU) contains an LSI module used for the clock.
The CLKU has redundant clock supply routes. If one route fails, the system can be
restarted through the other route to continue operation.
1.3.8 Operator Panel
The operator panel can be used to turn on and off the server power, switch between
operation modes, and display system status information.