doc/cephfs/standby: document mds_join_fs

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 1579ea026a8dcdb18d466fb57e799d68a6e4bdfc..29a74f65977b03a26a49e4b4f552cd62971f770c 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -282,3 +282,6 @@
   would not allow a pool to ever have completely balanced PGs.  For example, if
   crush requires 1 replica on each of 3 racks, but there are fewer OSDs in 1 of
   the racks.  In those cases, the configuration value can be increased.
+
+* MDS daemons can now be assigned to manage a particular file system via the
+  new ``mds_join_fs`` option.

diff --git a/doc/cephfs/standby.rst b/doc/cephfs/standby.rst
index 12a723774061c452634795eab9885179d59ea72c..b50378397aef205145263553d9e75f3a33ef48e8 100644 (file)
--- a/doc/cephfs/standby.rst
+++ b/doc/cephfs/standby.rst
@@ -26,6 +26,10 @@ A daemon has a *name* that is set statically by the administrator
 when the daemon is first configured.  Typical configurations
 use the hostname where the daemon runs as the daemon name.
 
+A ceph-mds daemons can be assigned to a particular file system by
+setting the `mds_join_fs` configuration option to the file system
+name.
+
 Each time a daemon starts up, it is also assigned a *GID*, which
 is unique to this particular process lifetime of the daemon.  The
 GID is an integer.