From: Ken Dreyer <kdreyer@redhat.com>
Date: Thu, 25 May 2017 17:40:48 +0000 (-0600)
Subject: doc: describe differences with "mds set" vs "fs set"
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doc: describe differences with "mds set" vs "fs set"

Thanks to John Spray <jspray@redhat.com> on ceph-users for this
information.

Signed-off-by: Ken Dreyer <kdreyer@redhat.com>
---

diff --git a/doc/cephfs/administration.rst b/doc/cephfs/administration.rst
index ccf6263d641..23bd5fc6a99 100644
--- a/doc/cephfs/administration.rst
+++ b/doc/cephfs/administration.rst
@@ -158,6 +158,11 @@ filesystem.
 Legacy
 ------
 
+The ``ceph mds set`` command is the deprecated version of ``ceph fs set``,
+from before there was more than one filesystem per cluster. It operates
+on whichever filesystem is marked as the default (see ``ceph fs
+set-default``.)
+
 ::
 
     mds stat