sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
sstrncpy (vl.type, "disk_io_time", sizeof (vl.type));
sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
sstrncpy (vl.type, "disk_io_time", sizeof (vl.type));