3-2 SPARC Enterprise M8000/M9000 Servers Site Planning Guide • April 2008
3.1.2 Recommended Ambient Temperature and Humidity
Keep the temperature in the computer room at a comfortable level for people or
slightly lower. This temperature level can prevent inadequate cooling of sections of
the computer room which can be due to heat generated by a device or by trapped
hot air. Keeping the computer room at a comfortable level can reduce related
adverse effects on each device in the entire system configuration.
Special consideration must be paid to humidity if underfloor ventilation is used.
Normally, air contains water vapor. Relative humidity, which is indicated as a
percentage (%) of the total amount of water vapor that can exist in the air without
condensing, is inversely proportional to air temperature; it goes down when the
temperature rises, and goes up when the temperature drops. For example, air with a
relative humidity of 45% at a temperature of 24°C (75°F) has a relative humidity of
65% at a temperature of 18°C (64°F); and if the temperature drops farther, the
relative humidity rises to more than 65%, eventually to condense out as water
droplets.
Air conditioning facilities usually do not provide functions to precisely monitor and
control the temperature and humidity throughout an entire computer room.
Generally, computer room air conditioning controls the temperature and humidity
TABLE 3-1 Specifications (Ambient Environmental Requirements)
System name
Temperature [°C (°F)]1
1 There is no condensation regardless of the temperature and humidity.
Humidity [%RH]1
Altitude
[m (ft)]Operating Non-operating Operating Non-operating
SPARC
Enterprise
M8000
server
and
SPARC
Enterprise
M9000
server
5 to 32 (41 to 89.6) at an installation
altitude ranging from 0 to less than
1500 m (4921 feet) above sea level
5 to 30 (41 to 86) at an installation
altitude ranging from 1500 m (4921
feet) to less than 2000 m (6562 feet)
above sea level
5 to 28 (41 to 82.4) at an installation
altitude ranging from 2000 m (6562
feet) to less than 2500 m (8202 feet)
above sea level
5 to 26 (41 to 78.8) at an installation
altitude ranging from 2500 m (8202
feet) to 3000 m (9843 feet) above sea
level
0 to 50
(32 to 122)
20 to 80 8 to 80 Operating
3000
(12000)
Non-
operating
12000
(40000)