Understanding Server Cooling Zones
These topics describe how components are cooled in the server rack.
Note -
For information about the number of power supplies that must remain in a system
for proper cooling, see
Servicing Power Supplies.
CMIOU Chassis Cooling Zones
The CMIOU chassis has two cooling zones. In one cooling zone, eight fan modules
push air through the CMIOUs from the front of the server and exhaust it at the rear
of the server. In the other cooling zone, six fan modules push air through the power
supplies and exhaust it through the chimney to the SPs and directly out the rear of
the chassis.
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1
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Main CMIOU cooling zone
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2
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CMIOU power supply cooling zone
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Switch Chassis Cooling Zones
The switch chassis has seven cooling zones. Six of the cooling zones contain a
horizontal row of six fan modules each. Each of these zones pushes air through a
single switch unit from the front of the server and exhausts it at the rear of the
server. In the other cooling zone, four fan modules push air through the power
supplies and exhaust it through the chimney to the SPs and directly out the rear of
the chassis.
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1
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Main switch unit cooling zones (1 through 6)
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2
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Switch unit power supply cooling zone
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