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122 Copyright © Acronis International GmbH, 2002-2015
The following is an example of how to reactivate GRUB in case the system disk (volume) is recovered
to identical hardware.
1. Start Linux or boot from the bootable media, and then press CTRL+ALT+F2.
2. Mount the system you are recovering:
mkdir /mnt/system/
mount -t ext3 /dev/sda2 /mnt/system/ # root partition
mount -t ext3 /dev/sda1 /mnt/system/boot/ # boot partition
3. Mount the proc and dev file systems to the system you are recovering:
mount -t proc none /mnt/system/proc/
mount -o bind /dev/ /mnt/system/dev/
4. Save a copy of the GRUB menu file, by running one of the following commands:
cp /mnt/system/boot/grub/menu.lst /mnt/system/boot/grub/menu.lst.backup
or
cp /mnt/system/boot/grub/grub.conf /mnt/system/boot/grub/grub.conf.backup
5. Edit the /mnt/system/boot/grub/menu.lst file (for Debian, Ubuntu, and SUSE Linux
distributions) or the /mnt/system/boot/grub/grub.conf file (for Fedora and Red Hat Enterprise
Linux distributions)for example, as follows:
vi /mnt/system/boot/grub/menu.lst
6. In the menu.lst file (respectively grub.conf), find the menu item that corresponds to the system
you are recovering. This menu items have the following form:
title Red Hat Enterprise Linux Server (2.6.24.4)
root (hd0,0)
kernel /vmlinuz-2.6.24.4 ro root=/dev/sda2 rhgb quiet
initrd /initrd-2.6.24.4.img
The lines starting with title, root, kernel, and initrd respectively determine:
The title of the menu item.
The device on which the Linux kernel is locatedtypically, this is the boot partition or the
root partition, such as root (hd0,0) in this example.
The path to the kernel on that device and the root partitionin this example, the path is
/vmlinuz-2.6.24.4 and the root partition is /dev/sda2. You can specify the root partition by
label (such as root=LABEL=/), identifier (in the form root=UUID=some_uuid), or device name
(such as root=/dev/sda2).
The path to the initrd service on that device.
7. Edit the file /mnt/system/etc/fstab to correct the names of any devices that have changed as a
result of the recovery.
8. Start the GRUB shell by running one of the following commands:
chroot /mnt/system/ /sbin/grub
or
chroot /mnt/system/ /usr/sbin/grub
9. Specify the disk on which GRUB is locatedtypically, the boot or root partition:
root (hd0,0)
10. Install GRUB. For example, to install GRUB in the master boot record (MBR) of the first disk, run
the following command:
setup (hd0)
11. Exit the GRUB shell:
122


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