今日將兩台工作站從 OpenSUSE 12.2 升級至 12.3
不料其中一台在升級完成後卻無法開機
研判似乎是 GRUB 損毀了
動作：使用 OpenSUSE 12.3 Rescue CD 修復 GRUB

Step.1 Download OpenSUSE 12.3 Rescue CD ISO file and burn.

Step.2 Boot using rescue CD

Step.3 Check & active LVM

$ vgscan
$ vgchange -ay system    # system is my volume group name

Step.4 mount original OS

$ mount /dev/mapper/system-root /mnt
$ mount /dev/sda1 /mnt/boot
$ mount --bind /dev /mnt/dev
$ mount --bind /proc /mnt/proc

Step.5 chroot and rebuild GRUB

$ chroot /mnt
$ yast bootloader

Step.6 using yast-bootloader to rebuild GRUB

Step.7 reboot

Done!