For devalias to be valid for disk slots 8-15, the system firmware level must be at 8.0.5.b (or a higher 8.0 level) or at 8.1.0.c (or higher). If your server’s system firmware does not meet the minimum requirement, you must use the full disk path to identify individual disks in the range 8-15.
For example, if running with the minimum system firmware level and the correct devalias, you can use the following command line to boot from the disk in slot 12:
# boot disk12
If your disk slot is in the range 8-15 and the system firmware level does not meet the requirement described above, you will need to specify the full device path for the boot disk. This example shows the path for disk 12:
# boot /pci@400/pci@2/pci@0/pci@4/scsi@0/disk@p10c