[[email protected] ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   60G  0 disk 
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0   59G  0 part 
  ├─centos-root 253:0    0 38.3G  0 lvm  /
  ├─centos-swap 253:1    0    2G  0 lvm  [SWAP]
  └─centos-home 253:2    0 18.7G  0 lvm  /home
sr0              11:0    1 1024M  0 rom  
[[email protected] ~]# 
[[email protected] ~]# lsblk /dev/sda
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   60G  0 disk 
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0   59G  0 part 
  ├─centos-root 253:0    0 38.3G  0 lvm  /
  ├─centos-swap 253:1    0    2G  0 lvm  [SWAP]
  └─centos-home 253:2    0 18.7G  0 lvm  /home
[[email protected] ~]# 
[[email protected] ~]# lsblk /dev/root
lsblk: /dev/root: not a block device
[[email protected] ~]#