• Help protect computer systems from corrosion problems associated with high humidity
levels.
• Provide the greatest operating time buffer in the event of air conditioner control failure.
• Help to avoid failures or temporary malfunctions caused by intermittent interference from
static discharges that might occur when relative humidity is too low. Electrostatic
discharge (ESD) is easily generated and not easily dissipated in areas where the relative
humidity level is below 35 percent. ESD risk becomes critical when relative humidity
levels drop below 30 percent.
Temperature Guidelines
An ambient temperature range of 21° to 23° Celsius (70° to 74° Fahrenheit) is optimal for
server reliability and operator comfort. Most computer equipment can operate in a wide
temperature range, but approximately 22° Celsius (72° Fahrenheit) is recommended
because it is easier to maintain safe humidity levels. Operating in this temperature range
provides a safety buffer in the event that the air conditioning system is not running for a
period of time.
Ventilation and Cooling Requirements
Always provide adequate space in front of and behind the rack to allow for proper ventilation
of rackmounted servers. Do not obstruct the front or back of the rack with equipment or
objects that might prevent air from flowing through the rack. Rackmountable servers and
equipment, including Oracle Server E5-2L, draw cool air in through the front of the rack and
release warm air out the back of the rack. There is no airflow requirement for the left and right
sides due to front-to-back cooling.
If the rack is not completely filled with components, then cover the empty sections with filler
panels. Gaps between components can adversely affect airflow and cooling in the rack.
The servers function while installed in a natural convection airflow. Follow these
environmental specifications for optimal ventilation:
• Ensure that air intake is in the front of the system, and the air outlet is in the back. Take
care to prevent recirculation of exhaust air in a rack or cabinet.
• Allow a minimum clearance of 123.2 cm (48.5 inches) in the front of the system, and 91.4
cm (36 inches) in the back.
• Ensure that airflow is unobstructed through the chassis.
Oracle Server E5-2L uses internal fans that can achieve between 130 CFM to 160 CFM
(depending on configuration), within the specified range of operating conditions.
• Ensure that ventilation openings, such as cabinet doors for both the inlet and exhaust of
the server, are unobstructed. For example, Oracle Rack Cabinet 1242 is optimized for
cooling. Both the front and back doors have 80 percent perforations that provide a high
level of airflow through the rack.
• Ensure that the front and back clearances between the cabinet doors is a minimum of 2.5
cm (1 inch) at the front of the server and 8 cm (3.15 inches) at the back of the server
when mounted. To improve cooling performance, these clearance values are based on
the inlet and exhaust impedance (available open area) and assume a uniform distribution
of the open area across the inlet and exhaust areas.
1
Most computer equipment can operate in a wide range (20 to 80 percent).
Appendix B
Environmental Requirements
B-5
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