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2.8 Cooling Fans
The cooling fans are high speed single rotor axial fans. Ten fans are housed in a cooling cage, located
centrally within the appliance, between the drive bays and the motherboard, as shown in
page
13. This allows maximum airflow through the system and minimizes noise.
Figure 2–9
Airflow is from front to rear, with cooling air being drawn across the drives, through the fans and
pressurizing the rear of the appliance. The pressurized rear allows the PSU to draw the air that it requires,
and perforations at the rear of the chassis allow cooling airflow over the processor heatsinks, memory,
motherboard, and PCI cards.
Back pressure created by rack doors and obstacles is not to exceed 5 pascals (0.5mm water gauge).
The cooling system provides sufficient airflow to make sure that drive maximum temperatures are not
exceeded when the appliance is at 35°C ambient (sea level) and one fan has failed.
The cooling cage contains ten individual high speed single rotor axial fans, individually connected to
and interfacing with the EM Card. This interface provides power and speed control to the fans and
returns tachometer output from each fan.
2.9 Drive Carrier Module
The drive carrier module comprises a hard disk mounted in a carrier. Each drive bay houses a single low
profile 1 inch high, 3.5–inch form factor disk drive in its carrier. The carrier has mounting locations for
SAS drives.
Each disk drive is enclosed in a sheet steel carrier which provides excellent thermal conduction, radio
frequency, and electro-magnetic induction protection and affords the drive physical protection.
The front cap features an ergonomic handle which provides the following functions:
Cooling Fan Module
Overview
Figure 2–3 on
21
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