Oracle SUN X4-8 Service Manual page 48

Server Subsystems
All CMOD processors have a heat sink.
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Each drive bay contains a storage device or a drive slot filler.
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Every DPCC is installed (regardless of whether it contains a card or not).
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Both fan frames are populated with fan modules.
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Cooling Zones
The server has five cooling zones. The cooling zones are designated from left to right (from the
front of the server) as zone 0 - zone 4. The airflow cooling in zone 0 is concentrated through the
power supplies (PSUs) and is provided by the internal PSU fan modules.
The fan modules (FMs) provide the airflow cooling for zones 1-4. Each zone has a pair of
dedicated FMs:
Zone 1 airflow cooling is concentrated on the CPU modules (CMODs) 0 and 1 and is
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provided by FMs 0 and 1.
Zone 2 airflow cooling is concentrated on CMODs 2 and 3 and is provided by FMs 2 and 3.
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Zone 3 airflow cooling is concentrated on CMODs 4 and 5 and is provided by FMs 4 and 5.
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Zone 4 airflow is concentrated on CMODs 6 and 7 and is provided by FMs 6 and 7.
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Note -
not powered. However, to maintain the integrity of the cooling subsystem, FMs 4-7 must be
installed in the server.
48 Sun Server X4-8 Service Manual • December 2015
In a four-CMOD configured server, the fan modules for cooling zones 3 and 4 are