Lenovo Secure Managed Client - Manual (Page 61)

Thermal cooling
The Secure Managed Client (SMC) - Storage Array uses extensive thermal
monitoring to ensure component temperatures are kept low and acoustic noise is
minimized. Airflow is from front to rear of the enclosure.
Table 10. Thermal cooling
Symptom Cause Action
If the ambient air is cool (below 25°C
or 77°F) and the fans are observed to
increase in speed then some
restriction on airflow may be causing
an additional internal temperature
rise.
Note: This is not a fault condition.
The first stage in the thermal control
process is for the fans to
automatically increase in speed when
a thermal threshold is reached. This
may be caused by higher ambient
temperatures in the local
environment and may be perfectly
normal.
Note: This threshold changes
according to the number of drives
and power supplies installed.
1. Check the installation for any
airflow restrictions at either the
front or rear of the enclosure. A
minimum gap of 2.5 cm (1 inch)
at the front and 5 cm (2 inches) at
the rear is recommended.
2. Check for restrictions due to dust
build up; clean as appropriate.
3. Check for excessive recirculation
of heated air from rear to front.
Use in a fully enclosed rack
installation is not recommended.
4. Check that all blank modules are
in place.
5. Reduce the ambient temperature.
1. Front operator's panel unit fault
LED amber.
2. An amber LED is on for one or
more PSUs.
If the internal temperature measured
in the airflow through the enclosure
exceeds a preset threshold, a thermal
alarm sounds.
1. Check to ensure that local
ambient environment temperature
is below the upper 35°C (95°F)
specification.
2. Check the installation for any
airflow restrictions at either the
front or rear of the enclosure. A
minimum gap of 2.5 cm (1 inch)
at the front and 5 cm (2 inches)
mm at the rear is recommended.
3. Check for restrictions due to dust
build up; clean as appropriate.
4. Check for excessive recirculation
of heated air from rear to front.
Use in a fully enclosed rack
installation is not recommended.
5. If possible, turn off the enclosure
and investigate the problem
before continuing.
Drive carrier module faults
Each Drive Carrier module has two LEDs: an upper (green) LED and a lower
(amber) LED.
v Under normal operation, the green LED is on and will flicker as the drive
operates
v Under normal operation, the amber LED will be:
– Off if there is no drive present
– Off as the drive operates
– On if a drive fault is present
Chapter 7. Troubleshooting and problem solving 55