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The cooling modules can operate at three rotation speed settings. 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 a cooling module, PSU, or a temperature sensor fails.
•
Elevated temperature: if the temperature breaches the upper threshold set for any of the
interior temperature sensors.
•
During the system initialization stage, the cooling fans operate at high speed and return to
low speed once the initialization process has completed and no erroneous condition 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 be changed. Refer to the Firmware Operation Manual for details.
System Monitoring Features
There are a number of monitoring approaches that provide the operating status of individual
components.
Expansion Enclosure Support
Monitoring:
A managing Unified Storage System is aware of the status of JBOD components including
those of:
•
Expander controller (presence, voltage and thermal readings)
•
PSU
•
Cooling module
•
Enclosure thermal sensor
•
Service (the Service signal to specify a specific enclosure)
•
Disk drives
JBOD Identifier:
The managing Unified Storage System will sound the alarm and deliver warning messages if
there is a conflict between JBOD IDs.
If more than one JBOD is connected to the managing Unified Storage System, each JBOD
needs a unique enclosure ID set using the rotary switch on the LED panel. For example, the
firmware automatically disconnects the second JBOD if it is connected online and comes
with an ID identical to that of the first JBOD.
NOTE
The IDs for JBODs are #1 to #15. For details, please refer to JBOD connections.
Cooling Module Speed Adjustment:
If any of the detected temperature readings breaches the temperature threshold, the
firmware running on the managing Unified Storage System automatically raises the rotation
speed of all cooling fans.
