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2-2 SPARC Enterprise M4000/M5000 Servers Site Planning Guide • April 2007
The operating environmental ranges in TABLE 2-1 reflect server testing. The optimum
condition is the suggested operating environment. Operating computer equipment
for extended periods at or near the temperature or humidity extremes is known to
significantly increase the failure rate of hardware components.
Note – In order to minimize any chance of downtime due to component failure, use
the optimal temperature and humidity ranges.
2.1.1 Ambient Temperature
The ambient temperature range of 21°C to 23°C (70°F to 74°F) is optimal for server
reliability and operator comfort levels. Most computer equipment can operate within
a wide temperature range, but a level near 22°C (72° F) is desirable because it is
easier to maintain safe associated relative humidity levels at this temperature.
Operating in this temperature range provides a safety buffer in the event the air
conditioning systems go down for a period of time.
TABLE 2-1 Environmental Ranges
Environmental
Factor Operating Range Non-Operating Range Optimum
Ambient
temperature
*
5°C to 35°C
(41°F to 95°F)
-20°C to 60°C
*
(-4°F to 140°F
)
21°C to 23°C
(70°F to 74°F
)
Relative
humidity
20% RH to 80% RH,
noncondensing
up to 93% RH,
noncondensing
45% RH to 50% RH,
noncondensing
Elevation 3000 m (10,000 ft) 12,000 m (40,000 ft)
* derated 2°C for every 1 km up to 3 km