NAME            ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED    RQ-SIZE   RA WSAME
sda                     0    512      0     512     512    1 deadline     128 4096    4M
|-sda1                  0    512      0     512     512    1 deadline     128 4096    4M
`-sda2                  0    512      0     512     512    1 deadline     128 4096    4M
  |-centos-root         0    512      0     512     512    1              128 4096    4M
  `-centos-swap         0    512      0     512     512    1              128 4096    4M
sr0                     0    512      0     512     512    1 cfq          128  128    0B
