16
Getting Started
Temperature Management
The aTCA-8202 shelf has two temperature sensors on the left and
right sides of the backplane. The aCMM-2200 ShMH automatically
detects these sensors and the temperature sensors on installed
ATCA blades. The ShMH uses these sensor readings to dynami-
cally adjust the fan speed to maintain safe shelf and blade temper-
atures.
The table below lists the temperature thresholds and Fan Level
settings applied by the ShMH as dictated by detected backplane
temperatures. Temperature thresholds of ATCA blades will vary.
Please refer to the user manual provided by the blade manufac-
turer.
Table 3-1: aTCA-8202 Backplane Thermal Thresholds
Each time an alarm is received by the ShMH, an event record will
be written to the System Event Log (SEL). System administrators
may use the the
clia
command to check the SEL (
clia sel
)
or
to verify the fan speeds detected and adjusted by the ShMH
(
clia fans
).
Non-Critical Threshold
When a temperature sensor monitored by the ShMH issues an
alarm that a device (shelf or blade) has exceeded the non-criti-
cal threshold, the fan speed will increase by one level. The fan
speed will continue to increase by one level every 30 seconds
as long as the alarm continues to be issued. When the alarm
turns off, the fan speed l will decrease by one level every 30
seconds.
Critical Threshold
When a temperature sensor monitored by the ShMH issues an
alarm that a device (shelf or blade) has exceeded the critical
Threshold
Temperature
Action
Non-Critical
45
ºC
Fan Level 7
Critical
50ºC
Fan Level 15
Non-Recoverable
65ºC
Shutdown all blades
Summary of Contents for aTCA-8202
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