Hitachi Compute Blade 500 Series User Manual page 195

6 The window returns to the main menu.
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Changing the order of booting disk arrays
This section describes the procedure for changing the booting order in an
environment in which multiple disk arrays are set.
Normally, the highest order of booting is assigned to the disk array that was
set at the top. You can assign a disk array that has been built later to the
highest in the boot order by changing the setting.
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MegaRAID WebBIOS for LSI SAS 2008
Hitachi Compute Blade 500 Series EFI User's Guide