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Chapter 9
Managing System Hardware
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
About Module Temperature
Built-in, automatic sensors are provided in all switches in the Cisco MDS 9000 Family to monitor your
switch at all times.
Each module (switching and supervisor) has four sensors: 1 (outlet sensor), 2 (intake sensor), 3 (onboard
sensor), and 4 (onboard sensor). Each sensor has two thresholds (in degrees Celsius): minor and major.
A threshold value of -127 indicates that no thresholds are configured or applicable.
Note
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•
Tip
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Minor threshold—When a minor threshold is exceeded, a minor alarm occurs and the following
action is taken for all four sensors:
System messages are displayed.
–
Call Home alerts are sent (if configured).
–
–
SNMP notifications are sent (if configured).
Major threshold—When a major threshold is exceeded, a major alarm occurs and the following
action is taken.
–
For sensors 1, 3, and 4 (outlet and onboard sensors):
System messages are displayed.
Call Home alerts are sent (if configured).
SNMP notifications are sent (if configured).
For sensor 2 (intake sensor):
–
If the threshold is exceeded in a switching module, only that module is shut down.
If the threshold is exceeded in an active supervisor module with HA-standby or standby present,
only that supervisor module is shut down and the standby supervisor module takes over.
If you do not have a standby supervisor module in your switch, you have an interval of 2 minutes
to decrease the temperature. During this interval the software monitors the temperature every
five (5) seconds and continuously sends system messages as configured.
To realize the benefits of these built-in, automatic sensors on any switch in the Cisco MDS 9500
Series, we highly recommend that you install dual supervisor modules. If you are using a Cisco
MDS 9000 Family switch without dual supervisor modules, we recommend that you
immediately replace the fan module even of one fan is not working.
About Module Temperature
Cisco MDS 9000 Family Configuration Guide
9-9
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