doc/glossary: beef up "Ceph Block Storage"

Beef up the "Ceph Block Storage" entry.

Signed-off-by: Zac Dover <zac.dover@gmail.com>

diff --git a/doc/glossary.rst b/doc/glossary.rst
index d810a2fd0e9afa72656daa82e8554881391cdc80..c80cd3e6b336ad8e6b6ae884d666fcf0a2e965b6 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -27,9 +27,14 @@
                 storage cluster. See also :term:`RBD`.
 
        Ceph Block Storage
-                The block storage "product," service or capabilities when used
-                in conjunction with ``librbd``, a hypervisor such as QEMU or
-                Xen, and a hypervisor abstraction layer such as ``libvirt``.
+                One of the three kinds of storage supported by Ceph (the other
+                two are object storage and file storage). Ceph Block Storage is
+                the block storage "product", which refers to block-storage
+                related services and capabilities when used in conjunction with
+                the collection of (1) ``librbd`` (a python module that provides
+                file-like access to :term:`RBD` images), (2) a hypervisor such
+                as QEMU or Xen, and (3) a hypervisor abstraction layer such as
+                ``libvirt``.
 
        Ceph Client
                 The collection of Ceph components which can access a Ceph