Description

This article explains Major alarm seen on MX devices with respect to fan tray rotor failure and method to mitigate the alarm.

Symptoms

The below alarms will be raised on the device:

 

root@device> show chassis alarms no-forwarding

3 alarms currently active

Alarm time              Class Description

2023-02-08 02:57:43 UTC Major Fan Tray 2 Pair 0 Outer Fan stopped due to rotor failure

2023-02-08 03:18:48 UTC Major Fan Tray 2 Pair 1 Inner Fan stopped due to rotor failure

2023-02-08 03:18:48 UTC Major Fan Tray 2 Pair 0 Inner Fan stopped due to rotor failure

 

root@device> show chassis environment no-forwarding

 

Class Item                          Status    Measurement

 

     Fan Tray 2 Fan 0              Failed

     Fan Tray 2 Fan 1              Failed

     Fan Tray 2 Fan 2              Failed



Logs:

Feb 8 02:57:43 device-re0 alarmd[9011]: Alarm set: FAN id=402653328, color=RED, class=CHASSIS, reason=Fan Tray 2 Pair 0 Outer Fan stopped due to rotor failure ----------> Major alarm set

Feb 8 02:57:48 device-re0 chassisd[8595]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Fan/Blower Failed (jnxContentsContainerIndex 4, jnxContentsL1Index 1, jnxContentsL2Index 1, jnxContentsL3Index 0, jnxContentsDescr Fan Tray 2 Fan 0, jnxOperatingState 2)

Feb 8 02:57:48 device-re0 chassisd[8595]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Fan/Blower Failed (jnxContentsContainerIndex 4, jnxContentsL1Index 1, jnxContentsL2Index 2, jnxContentsL3Index 0, jnxContentsDescr Fan Tray 2 Fan 1, jnxOperatingState 2)

Feb 8 02:57:48 device-re0 chassisd[8595]: CHASSISD_SNMP_TRAP6: SNMP trap generated: Fan/Blower Failed (jnxContentsContainerIndex 4, jnxContentsL1Index 1, jnxContentsL2Index 3, jnxContentsL3Index 0, jnxContentsDescr Fan Tray 2 Fan 2, jnxOperatingState 2)

Feb 8 03:18:48 device-re0 alarmd[9011]: Alarm set: FAN id=402653328, color=RED, class=CHASSIS, reason=Fan Tray 2 Pair 0 Inner Fan stopped due to rotor failure ----------> Major alarm set

Feb 8 03:18:48 device-re0 alarmd[9011]: Alarm set: FAN id=402653328, color=RED, class=CHASSIS, reason=Fan Tray 2 Pair 1 Inner Fan stopped due to rotor failure ----------> Major alarm set

 

Solution

These alarms are generated due to rotor failure on the fan tray. This leads to abnormal functionality of the fans and hence raising alarms.

 

The fan tray reporting this alarm needs to be replaced as it is hardware failure.

Please proceed with RMA of the fan tray.

 

Please open a case with JTAC Support for further investigation and assistance. 

Modification History

Initial Draft - 20/06/23

Related Information

The fan tray operates as a single unit. If an individual fan in the tray fails, you must replace the entire fan tray. However, the fan tray continues to operate indefinitely and provides sufficient cooling even when a single fan rotor fails. The fan tray operates indefinitely provided that the room temperature is within the operating range.