kernel panic because of wrong root directory entry in grub.conf file

Issue

• kernel panic after rebooting the server.

dracut Warning: Boot has failed. To debug this issue add "rdshell" to the kernel command line.
Kernel panic - not syncing: Attempted to kill init!
Pid: 1, comm: init Not tainted 2.6.32-220.el6.x86_64 #1
Call Trace:
 [<ffffffff814dac28>] ? panic+0x78/0x143
 [<ffffffff8106c492>] ? do_exit+0x852/0x860
 [<ffffffff81174135>] ? fput+0x25/0x30
 [<ffffffff8106c4f8>] ? do_group_exit+0x58/0xd0
 [<ffffffff8106c587>] ? sys_exit_group+0x17/0x20
 [<ffffffff8100b172>] ? system_call_fastpath+0x16/0x1b
panic occurred, switching back to text console

#boot=/dev/sda
default=0
timeout=0
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux (2.6.32-220.el6.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.32-220.el6.x86_64 ro root=UUID=a9174f50-9ff9-42b9-864a-cf27bd2c50f7 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto  KEYBOARDTYPE=pc rdblacklist=nouveau KEYTABLE=us rd_NO_DM >/dev/null

$ cat etc/fstab 

#
# /etc/fstab
# Created by anaconda on Sun Dec 30 17:54:04 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-LogVol00 /                       ext4    defaults        1 1
UUID=fd397c2d-29a7-4539-8c0d-e239d72aa628 /boot                   ext4    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0