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Rebooting BMC because one or more sensors are unreadable

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Applies to

  • ONTAP 9 
  • BMC

Issue

ONTAP reports multiple sensor unreadble condition and automatically recovers.
 
Example:
12/21/2024 20:38:14 node-01  NOTICE     nvmem.battery.normalCharge: The NVMEM battery charging status is normal.
12/21/2024 20:37:00 node-01  NOTICE     monitor.globalStatus.ok: The system's global status is normal.
12/21/2024 20:36:43 node-01  NOTICE     monitor.chassisFan.ok: Chassis fan SysFan3 F2 is ok.
12/21/2024 20:36:43 node-01  NOTICE     monitor.chassisFan.ok: Chassis fan SysFan3 F1 is ok.
12/21/2024 20:35:46 node-01  ERROR      callhome.c.fan.fru.shut: Call home for MULTIPLE CHASSIS FAN FAILED: System will shut down in 2 minutes
12/21/2024 20:35:22 node-01  ERROR      callhome.c.fan.fru.fault: Call home for CHASSIS FAN FRU FAILED: Fan3_2
12/21/2024 20:35:22 node-01  ERROR      callhome.c.fan.fru.fault: Call home for CHASSIS FAN FRU FAILED: Fan3_1
12/21/2024 20:35:01 node-01  NOTICE     sp.reboot.sensor.unreadable: Rebooting BMC because one or more sensors are unreadable.
12/21/2024 20:35:01 node-01  NOTICE     monitor.shutdown.cancel: Automatic shutdown sequence canceled.
12/21/2024 20:35:00 node-01  EMERGENCY  monitor.globalStatus.critical: Multiple fans has failed: SysFan3 F2, SysFan3 F1.
12/21/2024 20:34:51 node-01  EMERGENCY  monitor.chassisFanFail.xMinShutdown: Multiple Chassis Fan failure: System will shut down in 2 minutes.
12/21/2024 20:34:46 node-01  ERROR      monitor.chassisFan.stop: Chassis fan contains at least one stopped fan: Fan3_2 (failed)
12/21/2024 20:34:46 node-01  ERROR      monitor.chassisFan.stop: Chassis fan contains at least one stopped fan: Fan3_1 (failed)
[env_mgr: monitor.chassisTemperature.cool:alert]: Chassis temperature is too cool: Bat Ambient 2 is critical low (0 C).
[env_mgr: monitor.chassisTemperature.cool:alert]: Chassis temperature is too cool: PM40068B Temp is critical low (0 C).
[env_mgr: nvram.battery.capacity.low.critical:EMERGENCY]: The NVRAM battery capacity is critically low (0 cycles). To prevent data loss, the system will shut down in 5 minutes.
[env_mgr: nvram.hw.degraded:error]: NVRAM hardware is degraded: NVS Power Good has fault.
[env_mgr: callhome.battery.failure:EMERGENCY]: Call home for BATTERY (capacity low) CRITICAL.
  • SP-LATEST-SYSTEM-EVENT-LOG reports BMC reboot:

Record 2120: Wed Mar 11 19:22:17.239175 2026 [IPMI.warning]: Recovering BMC due to a non-readable sensor
Record 2121: Sun Jan 01 00:00:20.853442 2017 [IPMI.notice]: 052d | c0 | OEM: ffff70005100 | ManufId: 150300 | BMC Reset Internally

Ems Identifier sp.reboot.sensor.unreadable
Syslog Message Rebooting %s because one or more sensors are unreadable.
Severity NOTICE
Description This message occurs when one or more sensors are unreadable from Service Processor (SP) or Baseboard Management Controller (BMC).SP or BMC is rebooted in attempt to recover the sensor reading.
Corrective Action No user action is required.

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