1.3.4FAN Unit
The FAN unit is used to cool the server. There are two types of FAN units, with the following features:
■A redundant fan configuration enables continuous system operation even if a fan fails during system operation.
■Hot system maintenance or replacement of a faulty fan can be performed during system operation.
1.3.5Power 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 power supply unit fails during system operation.
■Hot system maintenance or replacement of a faulty power supply unit can be performed during system operation.
1.3.6Crossbar 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.
1.3.7Clock 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.
1.3.8Operator Panel
The operator panel can be used to turn on and off the server power, switch between operation modes, and display system status information.