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Battery events on AFF-A900/FAS9500 with BMC Firmware <16.3

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Applies to

AFF-A900/FAS9500 with BMC Firmware <16.3

Issue

NetApp AFF A900 and FAS9500 systems report nvram.battery.chargeFET.of" event messages concerning the NVRAM battery, sometimes preceded by another battery related hardware event, as example:
 
Fri Aug 05 23:48:32 +0200 [cluster_node_name: env_mgr: nvram.battery.voltage.high:EMERGENCY]: The NVRAM battery voltage is critically high (8700 mV). To prevent data loss, the system will shut down in 5 minutes.
Fri Aug 05 23:48:42 +0200 [cluster_node_name: env_mgr: nvram.battery.chargeFET.off:error]: The NVRAM battery charge FET is off. To prevent data loss, the system will shut down in 24 hours.
Fri Aug 05 23:49:13 +0200 [cluster_node_name: env_mgr: nvram.battery.voltage.normal:info]: The NVRAM battery voltage is normal.
Fri Aug 05 23:49:53 +0200 [cluster_node_name: env_mgr: nvram.battery.chargeFET.normal:info]: The NVRAM battery charge FET is on.

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