EonStor DS S48 Series Hardware Manual
1.6
Drawer Fan Cooling Module
Situated at the end of each drawer, there is a
drawer fan module at the end of each drawer.
They serve to pull air in from through the
convection holes on the front panel, the air cools
the hard drives and other system internals while
flowing through the enclosure and goes out the
back. For detail fan IDs, please refer to this
.
The drawer fan modules operate with three rotation speeds. Under normal operating
conditions, the cooling fans run at the low speed. Under the following conditions,
cooling fans raise their rotation speed to increase the airflow:
Component failure: if one cooling fan in a cooling module, a PSU, or a
temperature sensor fails, the remaining cooling fan(s) automatically
raises its rotation speed.
Elevated temperature: if the temperature breaches the upper threshold
set for any of the interior temperature sensors, the cooling fans
automatically raise their rotation speeds.
During the system initialization stage, the cooling fans operate at the
high speed and return to low speed once the initialization process is
completed and no erroneous condition is detected.
NOTE
There are two upper temperature thresholds: one for event notification and the other
for triggering higher fan rotation speed. The preset value for event notification can be
changed using the firmware-embedded configuration utility, while the fan speed
trigger cannot. Refer to the Firmware Manual for details.
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