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

[/etc/cgconfig.conf]

group DiskIO_Group {

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

}