Chapter 4: Subsystem Operation and Monitoring
Audible Alarm
4-15
LED
Status
OFF
The respective cooling fan is operating normally.
ON
The respective cooling fan has failed and the PSU module
must be replaced.
Table 4-8: Cooling Module LED Definitions
The subsystem has a novel approach to stabilize the temperature within the
chassis:
When sensors on the backplane detect high temperature reading or
the failure of any cooling fan or PSU module, the system will
increase the cooling fan rotation speed. Once the ambient
temperature falls back within the safe range or the faulty modules
have been replaced, the cooling fans operate with low rotation
speed.
4.5 Audible Alarm
Different controller environmental and operational parameters (like
temperature, etc.) have been assigned a range of values between which they
can fluctuate. If either the upper or lower thresholds are exceeded, an
audible alarm will automatically be triggered. The alarm will also be
triggered when an active component on the RAID fails. If a system manager
is onsite and hears an alarm, the manager must read the error message on the
LCD screen or PC terminal to determine what has triggered the alarm. After
determining what has occurred, the system manager must take appropriate
actions to rectify the problem.
WARNING!
Whenever an alarm is triggered, you must determine the problem. If the
audible alarm is ignored or not taken seriously and the problem is not
rectified, permanent damage to the system can result.
4.5.1 Default Threshold Values
Table 4-9
shows the default threshold values for the subsystem. If any of
these values are surpassed, the alarm will sound and a warning message will
be generated:
Upper Threshold
Lower Threshold
+3.3V
+3.6V +2.9V
