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CONTAP-66718: False-positive NVMEM battery alerts might cause ONTAP to shutdown during an active learning cycle

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Issue

  • On some storage systems, the learning cycle feature of the nonvolatile memory (NVMEM) battery interrupts some of the readings from battery sensors during an active learning cycle.
  • Sensor readings that drop below threshold values can trigger false-positive alerts and might cause ONTAP to shut down.
  • The following events are an example of this issue:

20:00:46 [node1:nvmem.battery.capLowCrit:EMERGENCY]: The NVMEM battery capacity is critically low (0 cycles). To prevent data loss, the system will shut down in 20 minutes.
20:01:46 [node1:callhome.battery.failure:EMERGENCY]: Call home for BATTERY (capacity low) CRITICAL.
20:02:36 [node1:nvmem.battery.fccLowCrit:EMERGENCY]: The NVMEM battery full-charge capacity is critically low (25 %). To prevent data loss, the system will shut down in 20 minutes.
20:03:36 [node1:callhome.battery.failure:EMERGENCY]: Call home for BATTERY (full charge capacity low) CRITICAL.
20:22:36 [node1:monitor.shutdown.emergency:EMERGENCY]: Emergency shutdown: Environmental Reason
  • Check the BMC's system event log (SEL) to confirm a battery learning cycle was active at the time these event were logged.

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