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E-Series write-back cache disabled after shelf overtemperature event

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e-series-systems
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hw
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Applies to

  •  NetApp E-Series systems
  •  NetApp SANtricity OS
  •  Systems with controller cache and Battery Backup Units (BBUs)

Issue

  • SANtricity reports critical event `ECRFLT:DWEF300-2`
  • Controller write-back cache shows disabled
  • Disk shelf reports critical temperature condition
  • Event log messages include one or more of the following:

B:3/7/26, 1:06:45 PM (13:06:45) 17317 212c Write-back caching fully restored - Shelf 99, Bay B

B:3/6/26, 11:46:53 PM (23:46:53) 17287 212b Write-back caching forcibly disabled - Shelf 99, Bay B - Event: BAD BBU-0,1,2,3,4,5,6 <--CRITICAL
B:3/6/26, 11:31:47 PM (23:31:47) 17286 210a Controller cache not enabled or was internally disabled - Shelf 99, Bay B - Event: BAD BBU,Battery Unusable-0
B:3/6/26, 11:31:47 PM (23:31:47) 17285 3101 Asynchronous event notification (AEN) posted for recently logged event - Shelf 99, Bay B
----> Sense 6/3f/c6 = Unit Attention - Temperature sensor failed
----> FRU group: Subsystem; Tray ID: 99, Type : Temp Sensor, State: Failed
A:3/6/26, 11:31:49 PM (23:31:49) 17284 281c Maximum temperature exceeded - Shelf 99 <--CRITICAL

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