doc: add LVM tag term to the glossary

Signed-off-by: Alfredo Deza <adeza@redhat.com>

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 382b9226589383c93a2fe8d9e03961d768a0d9ac..82546408a6e251b6bf66bff66a68fc0b19accfea 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -178,5 +178,10 @@ reflect either technical terms or legacy ways of referring to Ceph systems.
                A systemd ``type`` where a command is defined in ``ExecStart`` which will
                exit upon completion (it is not intended to daemonize)
 
+       LVM tags
+               Extensible metadata for LVM volumes and groups. It is used to store
+               Ceph-specific information about devices and its relationship with
+               OSDs.
+
 .. _http://github.com/ceph: http://github.com/ceph
 .. _Cluster Map: ../architecture#cluster-map