Chapter 19: Monitoring the Cooling System
Table 69: Cooling System Alarm Messages
Routing Platform LCD Short Version
M5 and M10
M7i and M10i
M20
M40
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A fan-name FAIL fan-name RMVD
M40e and M160
Too few fans
Fan Failure
Fan Removed
Fans Missing
T320 and T640 Fan Failure
Fan Removed
Fans Missing
CLI Long Version fan-name stopped spinning fan-name removed
Too few fans installed or working fan-name stopped spinning fan-name removed
Too few fans installed or working fan-name stopped spinning fan-name removed
Too few fans installed or working fan-name stopped spinning fan-name removed
Too few fans installed or working
RED ALARM - fan-name Failure
YELLOW ALARM - fan-name Removed
RED ALARM - Too many fans missing or failing
RED ALARM - fan-name Failure
YELLOW ALARM - fan-name Removed
RED ALARM - Too many fans missing or failing
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
Checking the Cooling System Alarms !
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JUNOS Internet Software Network Operations Guide: Hardware
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 .
Maintaining the Air Filter
Action To maintain the air filter on M40, M40e, M160, and T320 routers and T640 routing nodes, follow these steps:
1.
Check the air filter for dust, debris, or holes. If the air filter needs cleaning, clean it as described in the appropriate hardware guide.
2.
If the air filter needs repair, replace it as described in the appropriate hardware guide.
CAUTION: Because the impellers and fans are quite powerful, it is important to keep the air filter in place while the router is operating. The impellers and fans could pull in foreign material, such as bits of wire, through an unfiltered air intake, resulting in damage to router components.
Verifying a Fan Failure
Action To verify a fan failure, follow these steps:
1.
Perform a swap test on the fan. Remove the problem fan tray and put it into another bay. If the fan tray does not work in the other bay, it is probably faulty and must be replaced. If the fan tray works in another bay, there is probably a problem with the power connectivity from the midplane.
2.
Check the fan power connector.
3.
Check the fan connector on the router midplane.
4.
If the fan fails, replace it as described in the appropriate hardware guide. The fans are hot-removable and hot-insertable. You can replace the fans without powering down the router.
NOTE: The cooling system components (fans and impellers) do not have serial numbers. Therefore, you will not see a serial number listed in the hardware inventory or a serial number ID label on the component.
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Maintaining the Air Filter
Chapter 19: Monitoring the Cooling System
Verifying an Impeller Failure
Action To verify an impeller failure, follow these steps:
1.
Place your hand near the exhaust in the router chassis to determine whether the impellers are pushing air out. If you do not feel much air or no air at all, the impeller is not working.
2.
If the impeller fails, replace it as described in the appropriate hardware guide.
The impellers are hot-removable and hot-insertable. You can replace the fans without powering down the router.
NOTE: The cooling system components (fans and impellers) do not have serial numbers. Therefore, you will not see a serial number listed in the hardware inventory or a serial number ID label on the component.
Replacing a Cooling System Component
The cooling system components are hot-removable and hot-insertable. You can remove or replace a cooling system component without powering down the system and disrupting routing functions. However, you should not operate a router for more than a few minutes without the air filter in place to avoid dust, particles, or other material being sucked into the router chassis.
Action To replace a cooling system component, see the appropriate router hardware guide.
Verifying an Impeller Failure !
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