RAID controllers are not recommended for Unraid, though it still should work, but there's a problem initialing your controller:
May 2 17:42:48 unraid kernel: megaraid_sas 0000:01:00.0: Failed to transition controller to ready for scsi1.
May 2 17:42:48 unraid kernel: megaraid_sas 0000:01:00.0: Failed from megasas_init_fw 6406
You can try a different slot if available, or a firmware update, but best solution would be not to use it.