Fan Unit; Power Supply Unit; Crossbar Unit; Clock Control Unit - Fujitsu SPARC Enterprise M8000 Overview Manual

1.3.4

FAN 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.
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 Power Supply Unit fails during system operation.
Active (hot) system maintenance or replacement of a faulty Power Supply Unit
■
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.
1-22 SPARC Enterprise M8000/M9000 Servers Overview Guide • August 2009