Problem: After grub.conf are modified, kernel cannot be boot and will show the following error :
Kernel panic - not syncing : VFS : Unable to mount root fs on unknown-block(0,0)
Root cause : In grub.conf, kernel and initrd should be 2 separate lines
Fix : During boot menu, press c to enter grub command line
grub > kernel /vmlinuz-2.6.32-431.29.2.el6.x86_64 root=/dev/mapper/vg0-rootvol (press tab after /v )
grub > initrd /initramfs-2.6.32-431.29.2.el6.x86_64.img (press tab after /initramfs )
grub > boot
After system is up, modify grub.conf file again
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