Deployment Guide

Table 25. Troubleshooting thermal monitoring and control
Symptom Cause Recommended action
If the ambient air is below
25ºC (77ºF), and the fans
increase in speed, some
restriction on airflow may
be causing the internal
temperature to rise.
NOTE: This symptom 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
condition may be caused
higher ambient temperatures
in the local environment, and
may be normal condition.
NOTE: The threshold
changes according to the
number of disks and
power supplies fitted.
1. Check the installation for any airflow restrictions at either
the front or back of the enclosure. A minimum gap of
25 mm (1") at the front and 50 mm (2") 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 of the enclosure in a fully enclosed rack is not
recommended.
4. Verify that all blank modules are in place.
5. Reduce the ambient temperature.
Table 26. Troubleshooting thermal alarm
Symptom Cause Recommended action
1. Ops panel Module Fault
LED is amber.
2. Fan Fail LED is illuminated
on one or more PCMs.
Internal temperature exceeds
a preset threshold for the
enclosure.
1. Verify that the local ambient environment temperature
is within the acceptable range. See the technical
specifications in the Dell EMC PowerVault ME4 Series
Storage System Owner’s Manual.
2. Check the installation for any airflow restrictions at either
the front or back of the enclosure. A minimum gap of
25 mm (1") at the front and 50 mm (2") 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 of the enclosure in a fully enclosed rack is not
recommended.
5. If possible, shut down the enclosure and investigate the
problem before continuing.
Troubleshooting 5U enclosures
Common problems that may occur with your 5U enclosure system.
The Module Fault LED on the Ops panel, described in Ops panel LEDs—5U enclosure front panel on page 73, lights amber to
indicate a fault for the problems listed in the following table:
NOTE: All alarms also report through SES.
Table 27. 5U alarm conditions
Status Severity
PSU alert – loss of DC power from a single PSU Fault – loss of redundancy
Cooling module fan failure Fault – loss of redundancy
SBB I/O module detected PSU fault Fault
PSU removed Configuration error
Enclosure configuration error (VPD) Fault – critical
Low temperature warning Warning
High temperature warning Warning
Over-temperature alarm Fault – critical
82 Troubleshooting and problem solving