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    • https://kb.netapp.com/on-prem/E-Series/Hardware-KBs/E-Series_detects_Controller_redundancy_lost_events_due_to_maintenance_offline
      E-Series system detects following events E-Series Notification (Controller redundancy lost) CRITICAL E-Series Notification (Write-back caching forcibly disabled) CRITICAL STORAGE-ARRAY-PROFILE indicat...E-Series system detects following events E-Series Notification (Controller redundancy lost) CRITICAL E-Series Notification (Write-back caching forcibly disabled) CRITICAL STORAGE-ARRAY-PROFILE indicates the one controller is in Failed (Offline) status Controller in Shelf 99, Bay B - Unable to retrieve latest data; using last known state. MAJOR-EVENT-LOG indicates Controller reset by its alternate Description: Controller reset by its alternate Logged by: Controller in bay A