Issue

• SYMLINKS are being used in /etc/fstab file instead of block device names for device-name field.
• Device name to be mounted in /etc/fstab files are SYMLINKS to /dev/dm-* devices. In earlier versions of RHEL, block devices were being used as device names in fstab file.

#
# /etc/fstab
# Created by anaconda on Sat Apr 11 02:35:06 2015
#
# 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/vg_dhcp23435-lv_root /                       ext4    defaults        1 1
UUID=34d190bb-2b02-4c72-b64f-0dd8571c463e /boot                   ext4    defaults        1 2
/dev/mapper/vg_dhcp23435-lv_swap swap                    swap    defaults        0 0
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


# ls -l /dev/dm-*
brw-rw----. 1 root disk 253, 0 Apr 11 02:42 /dev/dm-0
brw-rw----. 1 root disk 253, 1 Apr 11 02:42 /dev/dm-1

# ls -l /dev/mapper/vg_dhcp23435-lv_swap 
lrwxrwxrwx. 1 root root 7 Apr 11 02:42 /dev/mapper/vg_dhcp23435-lv_swap -> ../dm-1

# ls -l /dev/vg_dhcp23435/lv_swap 
lrwxrwxrwx. 1 root root 7 Apr 11 02:42 /dev/vg_dhcp23435/lv_swap -> ../dm-1

Here /dev/mapper/vg_dhcp23435-lv_swap is SYMLINK to /dev/dm-1 which is being used as device name in /etc/fstab file.