Cooling Airflow Direction
Each enclosure includes its own forced-air cooling fans or blowers. Air flow for each enclosure
enters from the front of the rack and rack and exhausts at the rear.
Typical Acoustic Noise Emissions
70 dB(A) (sound pressure level at operator position)
Tested Electrostatic Immunity
• Contact discharge: 8 KV
• Air discharge: 20 KV
Calculating Specifications for Enclosure Combinations
Power and thermal calculations assume that each enclosure in the rack is fully populated. The
power and heat load is less when enclosures are not fully populated, such as a Fibre Channel
disk module with fewer disk drives.
AC current calculations assume that one PDU delivers all power. In normal operation, the power
is split equally between the two PDUs in the rack. However, calculate the power load to assume
delivery from only one PDU to allow the system to continue to operate if one of the two AC power
sources or PDUs fails.
“Example Rack Load Calculations” (page 56) lists the weight, power, and thermal calculations
for a 42U NS2300 system with:
• Four blade elements
• Two VIO enclosures
• Two SAS disk enclosures and two Storage CLIMs
• 50 SAS disk drives in two enclosures
• Two rack-mounted system consoles with keyboard/monitor units
• Two maintenance switches
Calculating Specifications for Enclosure Combinations 55
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