doc: explain the consequence of enabling mirroring through monitor commands

Signed-off-by: Jos Collin <jcollin@redhat.com>
(cherry picked from commit ed3ce72fbc0b097131945cbb39caa0831401b94a)

diff --git a/doc/cephfs/cephfs-mirroring.rst b/doc/cephfs/cephfs-mirroring.rst
index 675d2dbd41c1a794dc5eebb4cc3ea8cfd0fa55b4..a8603094c2d4f4dc5953d04f8ceca0e4e417909b 100644 (file)
--- a/doc/cephfs/cephfs-mirroring.rst
+++ b/doc/cephfs/cephfs-mirroring.rst
@@ -120,7 +120,9 @@ system, run a command of the following form:
 
 .. note:: "Mirroring module" commands are prefixed with ``fs snapshot mirror``.
    This distinguishes them from "monitor commands", which are prefixed with ``fs
-   mirror``. Be sure (in this context) to use module commands.
+   mirror``. Enabling mirroring by using monitor commands will result in the mirror daemon
+   entering the "failed" state due to the absence of the `cephfs_mirror` index object.
+   So be sure (in this context) to use module commands.
 
 To disable mirroring for a given file system, run a command of the following form: