4. When the priority order of boot the device has been set already, Change
Boot Order is not necessary. Select Discard Changes and Exit, then
execute from procedure 8.
5. In other case, select Change the order.
6. Press + or -, change the priority order of the boot device as below.
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Setup of LPAR manager
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide