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EonStor A08U/A12U-G2421 Installation and Hardware Reference Manual
1.2.6 Cooling Fan Modules
PN: 9272CfanModE-0010
The SATA-based EonStor subsystems are equipped with two (for A08U, the 8-bay
model) or three (for A12U, the 12-bay model), 1U single-fan, redundant, hot-
swappable cooling modules shown in
Figure 1-18
. One 9.7cm fan is housed in each
cooling module. These modules have been designed to generate a cooling flow from
the front to the rear of the subsystem to extract the heat generated by the SATA hard
drives. Two of the cooling fan modules are installed directly beneath the PSUs. For
the 12-bay subsystem, a third module is located directly beneath the controller
module.
Figure 1-18: Top View of a Cooling Fan Module
Advanced Fault-Preventative Operation
The cooling fan modules support dual-speed operation modes that help to protect the
subsystem in the event of component failure or extreme working condition.
Intelligent Dual Speed Operation
The cooling fans operate with two rotation speeds. Under normal operating
conditions, the cooling fans run at the low speed, which is sufficient for maintaining
efficient airflow across components. Under the following conditions, cooling fans
raise their rotation speed to increase the airflow:
1. Component Failure: if another cooling fan module, a PSU, or a temperature
sensor fails, the remaining cooling fan(s) automatically raises its rotation
speed.
2. Elevated Temperature: if the temperature breaches the upper threshold set for
any of the interior temperature sensors, the cooling fans automatically raises
its rotation speed.
3. During the subsystem initialization stage, the cooling fans operate at the high
speed and return to lower speed once the initialization process is completed
and no erroneous condition is detected.
Subsystem Components
1-12