Step 3: Display Cooling System Error Messages in the System Log File

Action

To view cooling system error messages in the system log file, use the following CLI command:

user@host> show log messages | match fan 

Sample Output

user@host> show log messages | match fan

Apr  8 14:00:15 myrouter scb CM: ALARM SET: (Major) Power Supply A fan failed

Apr  8 14:00:15 myrouter alarmd[584]: Alarm cleared: Pwr supply color=RED, 
class=CHASSIS, myrouter=Power Supply A fan failed

Apr  8 14:00:18 myrouter scb CM: ALARM CLEAR: Power Supply A fan failed

Apr  8 14:00:21 myrouter alarmd[584]: Alarm set: Pwr supply color=RED, 
class=CHASSIS, reason=Power Supply A fan failed

Apr  8 14:00:23 myrouter scb CM: ALARM SET: (Major) Rear left fan stopped 
spinning

Apr  8 14:05:16 myrouter alarmd[584]: Alarm set: Fan color=RED, class=CHASSIS, 
reason=Rear left fan stopped spinning

What It Means

The messages system log file records the time when the failure or event occurred, the severity level, a code, and a message description. Use the show log messages | match fan command to view only fan error messages. Use this information to diagnose a cooling system problem and to let the Juniper Networks Technical Assistance Center (JTAC) know what error messages were generated and the router events prior to the problem. For more information about system log messages, see the JUNOS System Log Messages Reference.