.br
\fBdevices { filter=["r|cdrom|"] }\fP
.IP
+\fBglobal_filter\fP \(em Since "filter" is often overriden from command line, it
+is not suitable for system-wide device filtering (udev rules, lvmetad). To hide
+devices from LVM-specific udev processing and/or from lvmetad, you need to set
+global_filter. The syntax is the same as for normal "filter" above. Devices that
+fail the global_filter are not even opened by LVM.
+.IP
\fBcache_dir\fP \(em Persistent filter cache file directory.
Defaults to "#DEFAULT_CACHE_DIR#".
.IP
library to load if \fBlocking_type\fP is set to 2.
The default is \fBliblvm2clusterlock.so\fP. If you need to write
such a library, look at the lib/locking source code directory.
+.IP
+\fBuse_lvmetad\fP \(em Whether to use (trust) a running instance of lvmetad. If
+this is set to 0, all commands fall back to the usual scanning mechanisms. When
+set to 1 \fBand\fP when lvmetad is running (it is not auto-started), the volume
+group metadata and PV state flags are obtained from the lvmetad instance and no
+scanning is done by the individual commands. In a setup with lvmetad, lvmetad
+udev rules \fBmust\fP be set up for LVM to work correctly. Without proper udev
+rules, all changes in block device configuration will be \fBignored\fP until a
+manual 'pvscan --cache' is performed.
+.br
+If lvmetad has been running while use_lvmetad was 0, it \fBMUST\fP be stopped before
+changing use_lvmetad to 1 and started again afterwards.
.TP
\fBtags\fP \(em Host tag settings
.IP