doc: add historical warning for mds_standby_replay

When testing < v10.2.1 with standby replay, I was often confused why the
MDS daemons would go into replay even when this was false.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

diff --git a/doc/cephfs/standby.rst b/doc/cephfs/standby.rst
index 406f213561251a65e98273ac43f7cc11c1135f90..eecf7808a6f40831e7b4c0d6ffc4aed21ceefc02 100644 (file)
--- a/doc/cephfs/standby.rst
+++ b/doc/cephfs/standby.rst
@@ -109,6 +109,9 @@ used as a standby for the rank that it is following.  If another rank
 fails, this standby replay daemon will not be used as a replacement,
 even if no other standbys are available.
 
+*Historical note:* In Ceph prior to v10.2.1, this setting (when ``false``) is
+always true when ``mds_standby_for_*`` is also set.
+
 mds_standby_for_name
 ~~~~~~~~~~~~~~~~~~~~