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PSU & Cooling Module
The two redundant, hot-swappable PSUs have a power socket
(1)
, power switch
(2)
, PSU
status LED
(3)
, cooling module
(4)
, retention screw
(5)
and an extraction handle
(6)
.
When cooling modules run under normal operating condition, the cooling fans run at a 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 expansion enclosures
components including those of:
Expander controller (presence, voltage and thermal readings)
PSU
