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CFBMC-965: False-positive NVMEM battery alerts sometimes cause ONTAP to shutdown during an active learning cycle on some systems

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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.
  • You might see the following error messages when this issue occurs:
    01:03:53 [node01:nvmem.battery.fccLowCrit:EMERGENCY]: The NVMEM battery full-charge capacity is critically low (15 cycles). To prevent data loss, the system will shut down in 20 minutes.
    01:04:34 [node02: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.
    01:04:53 [node01:callhome.battery.failure:EMERGENCY]: Call home for BATTERY (full charge capacity low) CRITICAL.
    01:05:03 [node01:callhome.battery.failure:EMERGENCY]: Call home for BATTERY (capacity low) CRITICAL.
    01:23:54 [node01:monitor.shutdown.emergency:EMERGENCY]: Emergency shutdown: Environmental Reason Shutdown (Battery PCT capacity critical)
    01:33:39 [node1:nvmem.battery.capNormal:notice]: The NVMEM battery capacity is normal.

  • The false positive alert message is sometimes followed by a "return to normal" message.
  • The battery learning cycle occurs every 70 days and takes approximately 19 hours to complete. During this time, the system is susceptible to this issue.

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