root@riguz_hk:~# iostat
Linux 4.4.0-85-generic (riguz_hk) 02/26/2018 _i686_ (1 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
0.09 0.00 0.02 0.01 0.00 99.88
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
vda 0.34 0.13 2.27 1852793 32162212
root@riguz_hk:~# iostat 1 2
Linux 4.4.0-85-generic (riguz_hk) 02/26/2018 _i686_ (1 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
0.09 0.00 0.02 0.01 0.00 99.88
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
vda 0.34 0.13 2.27 1852805 32162212
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
vda 0.00 0.00 0.00 0 0