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Cisco Bug: CSCvv36870 - Fabric Interconnect Unexpected Shutdown with Reset Reason: Powered-down due to fan policy trigger

Last Modified

Sep 03, 2020

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

3.2(3i)A

Description (partial)

Symptom:
Fabric interconnect will shutdown completely.

Once the Fabric Interconnect is rebooted you can run the following commands via CLI to verify you hit this defect: 

 - connect nxos x (x = a or b; whichever FI failded)
 - show system reset-reason
 - show logging nvram


`show system reset-reason`
----- reset reason for Supervisor-module 1 (from Supervisor in slot 1) ---
1) At 717149 usecs after Fri Aug  7 10:06:56 2020
    Reason: Powered-down due to fan policy trigger
    Service: 
    Version: 5.0(3)N2(3.23f)


 
`show logging nvram`

2020 Aug  7 10:06:55 UCSFI-A %$ VDC-1 %$ Aug  7 10:06:55 %KERN-2-SYSTEM_MSG: [46821455.137807] clear_stuck_slaves: I2C clock line held low by some device! - kernel
2020 Aug  7 10:06:55  UCSFI-A %$ VDC-1 %$ Aug  7 10:06:55 %KERN-2-SYSTEM_MSG: [46821455.162907] clear_stuck_slaves: I2C clock line still stuck, could not clear - kernel
2020 Aug  7 10:06:56  UCSFI-A %$ VDC-1 %$ %PFMA-0-SYS_SHUTDOWN_FAN_REMOVAL: System shutdown in 0 seconds due to fan removal
2020 Aug  7 10:06:56  UCSFI-A  %$ VDC-1 %$ Aug  7 10:06:56 %KERN-0-SYSTEM_MSG: [46821455.923079] Shutdown Ports.. - kernel
2020 Aug  7 10:06:56  UCSFI-A %$ VDC-1 %$ Aug  7 10:06:56 %KERN-0-SYSTEM_MSG: [46821455.960734]  writing reset reason 104,  - kernel
2020 Aug  7 10:06:56 UCSFI-A %$ VDC-1 %$ Aug  7 10:06:56 %KERN-2-SYSTEM_MSG: [46821456.032686] clear_stuck_slaves: I2C clock line held low by some device! - kernel

Conditions:
Found in both Fabric Interconnects 6248 and 6296
UCSM version: 3.2(3i)
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