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    • https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/Replacement_E-Series_E2800_controller_goes_into_reboot_loop_and_locks_down_with_OE_LU_status
      After replacing E2800/EF280 controller in a 11.30.x setup, the replacement controller reboot loops after attempting to auto synchronize (ACS) its SANtricity OS to match the original controller (11.30....After replacing E2800/EF280 controller in a 11.30.x setup, the replacement controller reboot loops after attempting to auto synchronize (ACS) its SANtricity OS to match the original controller (11.30.x). The following messages are logged right before reboot, which indicate the controller is attempting to ACS its firmware: 07/21/22-19:25:16 (tRAID): NOTE: ACS coordinating with baseOS to allocate buffer 07/21/22-19:25:16 (tRAID): NOTE: ACS processing downgrade - waiting on semaphore