[cephuser@storage-ru1-osd1 ~]$ iostat
Linux 3.10.0-693.17.1.el7.x86_64 (storage-ru1-osd1.voximplant.com)      05/21/2018      _x86_64_        (6 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1.58    0.01    0.42    1.50    0.00   96.49

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sdf               7.49        50.72       186.85  460133405 1695043164
sde              22.67       840.96       263.34 7628804770 2388950522
sdc              15.47       733.61       209.69 6655030997 1902245866
sda              22.48       791.32       250.94 7178557971 2276433425
sdd               8.89       594.48       132.23 5392891793 1199499798
sdb              32.07       952.25       327.66 8638402770 2972359250
dm-0              7.49        49.87       185.01  452399636 1678295388
dm-1              0.58         0.85         1.49    7692440   13507940
dm-2              0.05         0.00         0.36       6312    3237428