NAME                       MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                          8:0    0   20G  0 disk
├─sda1                       8:1    0    1G  0 part /boot
└─sda2                       8:2    0   19G  0 part
  ├─centos_dhcp43--57-root 253:0    0   17G  0 lvm  /
  └─centos_dhcp43--57-swap 253:1    0    2G  0 lvm  [SWAP]
sdb                          8:16   0  500G  0 disk
sr0                         11:0    1 1024M  0 rom