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CFBMC-1586: False-positive NVMEM battery alerts periodically cause ONTAP to shut down during an active learning cycle on some systems

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Issue

The following models are potentially affected:

  • AFF A900, AFF A800, AFF A700, AFF A320, AFF A220, AFF A200, and AFF C190
  • FAS9500, FAS9000, FAS8200, FAS2750, FAS2720, FAS2650, and FAS2620

You might see the following periodic error messages while this issue occurs:
.. 01:03:53 [node01: statd: monitor.nvramLowBattery:EMERGENCY]: NVRAM battery is dangerously low.
.. 01:03:53 [node01: statd: monitor.nvramLowBattery.notice:notice]: If the NVRAM battery is dangerously low,
the system shuts down automatically every 24 hours to encourage you to replace it. If you reboot the system
it will run for another 24 hours before shutting down.
.. 01:03:53 [node01: statd: callhome.battery.low:alert]: Call home for BATTERY_LOW.
.. 01:03:53 [node01: statd: monitor.shutdown.nvramLowBattery.pending:alert]: NVRAM battery is dangerously low.
Halting system in 24 hours. Replace the battery immediately!
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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