iostat

Linux 3.13.0-100-generic (rsyslog)      12/28/2016      _x86_64_        (2 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1.10    0.01    1.06   33.36    0.00   64.48

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
vda              11.69        15.26       150.26   69775029  687220544
vdb               0.00         0.00         0.00       1633          8
vdc               0.00         0.00         0.00       6716       9272