In this tutorial, we will show you how to verify the hard disk usage of your server with iostat.

Install iostat package

Centos

yum install sysstat -y

Debian/Ubuntu

apt-get install sysstat -y

Run iostat to get the hard disk usage

iostat -x -m 5
  
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1.60    0.00    0.46    0.31    0.00   97.63
Device:  rrqm/s   wrqm/s   r/s   w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
sda        0.00     6.80  1.80  3.80     0.01     0.04    18.86     0.02    2.75   1.96   1.10
sda1       0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda2       0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda3       0.00     6.80  1.80  3.80     0.01     0.04    18.86     0.02    2.75   1.96   1.10

The value “5” is the duration between every verification. It can be changed by any value.

To exit iostat just press “CTRL + c”