Linux 2.6.32-573.12.1.el6.x86_64 (bristol.zcubator.net)     12/14/2017  _x86_64_    (8 CPU)
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
       8.60    0.52    2.31   14.94    0.05   73.58
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvdb             10.54   127.57  163.17   18.39     6.23     0.57    76.67     0.83    4.59    3.29   16.13   3.95  71.80
xvdc              0.00     0.00    0.00    0.00     0.00     0.00     8.31     0.00    0.90    0.90    0.00   0.90   0.00
xvda              3.80    20.36   34.52   32.07     0.63     0.43    32.66     0.21    3.09    3.71    2.42   1.16   7.69