{
  $OUT = '';
  qx(zabbix_agentd -t vfs.dev.discovery -c /dev/null | grep -q ZBX_NOTSUPPORTED);
  if ($? != 0){
    $OUT .= '# vfs.dev.discovery is natively supported, not UserParameter needed';
  } else{
    $OUT .=<<'_EOF';
# Discover block devices
UserParameter=vfs.dev.discovery,/var/lib/zabbix/bin/disco_block_devices
_EOF
  }
}