Changes

{{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:}}

{{Warning box|as the dd command is named "data destroyer" you need to be extremely prudent and don't make a mistake on the name of source partition or destination. In first you should skip the dd command and try directly the second with grub. If the grub can be installed without dd, forget it.}}

{{Warning box|as the dd command is named "data destroyer" you need to be extremely prudent and sure of the name of source partition and/or destination. At first you should skip the dd command, Step 1 below, and attempt to install grub without it, see Step 2 below. If grub can be installed without using dd, then Step 1 can be discarded.}}

to copy boot partition (sda=disk of the array sdc=the spare)

To copy boot partition (sda=disk of the array sdc=the spare), from within a terminal with administrator privileges :

  dd if=/dev/sda1 of=/dev/sdc1  

  dd if=/dev/sda1 of=/dev/sdc1  

From within a terminal with administrator privileges :

Issue following from within a terminal with administrator privileges :

  grub

  grub

  device (hd2) /dev/sdc

  device (hd2) /dev/sdc