Check disk utilization with iostat

# iostat -x 1
Linux 2.6.32-431.1.2.el6.x86_64 (server.example.com)  10/04/2016      _x86_64_        (32 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          21.19    0.00    4.73    0.15    0.00   73.94

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.09    24.52    0.52   11.94    41.18   284.77    26.14     0.01    0.67   0.22   0.27
sdc               0.13   379.34    2.42   22.32   564.11  3213.28   152.65     0.04    1.71   0.38   0.95
sdb               0.13   365.38    2.90   22.07   730.80  3099.62   153.41     0.05    1.97   0.42   1.04
dm-0              0.00     0.00    0.25    0.43     5.61     3.36    13.12     0.00    1.57   0.72   0.05
dm-1              0.00     0.00    0.00    0.00     0.01     0.00     8.00     0.00    1.68   1.11   0.00
dm-2              0.00     0.00    0.00    0.10     0.08     0.84     8.40     0.00    0.80   0.51   0.01
dm-3              0.00     0.00    0.01   10.21     0.12    81.68     8.00     0.01    0.63   0.05   0.05
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