By removing the "disk" plugin name. Other plugins, for example the
NetApp plugin, create such graphs, too.
PluginInstance "/any/"
Type "disk_merged"
TypeInstance ""
PluginInstance "/any/"
Type "disk_merged"
TypeInstance ""
PluginInstance "/any/"
Type "disk_octets"
TypeInstance ""
PluginInstance "/any/"
Type "disk_octets"
TypeInstance ""
PluginInstance "/any/"
Type "disk_ops"
TypeInstance ""
PluginInstance "/any/"
Type "disk_ops"
TypeInstance ""
PluginInstance "/any/"
Type "disk_time"
TypeInstance ""
PluginInstance "/any/"
Type "disk_time"
TypeInstance ""