https://legitwhiz.github.io/technology_memo/Resource_control_using_cgroups(RHEL7).html

yum install libcgroup libcgroup-tools

/usr/bin/systemctl enable cgconfig
/usr/bin/systemctl enable cgred

[/etc/cgconfig.conf]

group DiskIO_Group  {
    blkio {
        blkio.throttle.read_iops_device = "8:0 999";
        blkio.throttle.write_iops_device = "8:0 999";
    }
}