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{{Warning box|Grub is unable to install itself on an empty disk or empty partitions; to have the spare fully working and booting after a sync the boot partition on the spare drive needs to be duplicated:}}
{{Warning box|Grub is unable to install itself on an empty disk or empty partitions; to have the spare fully working and booting after a sync the boot partition on the spare drive needs to be duplicated:}}
dd if=/dev/sdx1 of=/dev/sdy1 (to copy boot partition)
to copy boot partition (sda=disk of the array sdc=the spare)
dd if=/dev/sda1 of=/dev/sdc1
From within a terminal with the administrator privileges :
From within a terminal with the administrator privileges :
