On an Oracle Database Appliance single-node server, OAKD is always in the leader role. Oracle Database Appliance single-node systems do not have SAS storage, hence hardware library is not used. Storage and Hardware Management Library is used for storage discovery.
There are no SAS HBA (Controller) and hence hardware events notification is available. UDEV events notification are used for disk hot plugs. Instead of predictive failure checks, NVMe disks uses critical warning check using OAK NVMe interface.