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Cisco Bug: CSCuw48559 - Nexus 5K: Change fan detection logic

Last Modified

Jul 20, 2018

Products (7)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5020 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch
  • Cisco Nexus 5010 Switch

Known Affected Releases

5.2(1)N1(7) 5.2(1)N1(8.141)

Description (partial)

Symptom:
In Nexus 55xx switches, fans stop getting detected by the switch even though the fans are present in the system and spinning. if this condition is hit, messages such as following will be printed and the switch will shut down even though the fans are present and spinning.

2015 Mar 19 22:13:44.791 Nexus5548UP %$ VDC-1 %$ %NOHMS-2-NOHMS_ENV_ERR_FAN_DOWN: System minor alarm on fans: One fan missing or failed
2015 Mar 19 22:13:44.792 Nexus5548UP %$ VDC-1 %$ %PFMA-2-PFMA_FAN_REMOVED: Fan module 1 N5548P-FAN removed
2015 Mar 19 22:13:45.015 Nexus5548UP %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_REMOVAL: System shutdown in 60 seconds due to fan removal
2015 Mar 19 22:13:45.015 Nexus5548UP %$ VDC-1 %$ %NOHMS-2-NOHMS_ENV_ERR_FANS_DOWN: System major alarm on fans: Multiple fans missing or failed
2015 Mar 19 22:13:45.017 Nexus5548UP %$ VDC-1 %$ %PFMA-2-PFMA_FAN_REMOVED: Fan module 2 N5548P-FAN removed
2015 Mar 19 22:13:50.012 Nexus5548UP %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_REMOVAL: System shutdown in 55 seconds due to fan removal
2015 Mar 19 22:13:55.013 Nexus5548UP %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_REMOVAL: System shutdown in 50 seconds due to fan removal

Conditions:
Unknown
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