doc/cephfs/experimental-features: kernel client snapshots limit

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/doc/cephfs/experimental-features.rst b/doc/cephfs/experimental-features.rst
index 2f627c7374a51f65fa940b0829eb56e1defaf5ca..5b3522721aecbebc43dfc5c7080b7a161256c459 100644 (file)
--- a/doc/cephfs/experimental-features.rst
+++ b/doc/cephfs/experimental-features.rst
@@ -46,6 +46,9 @@ snapshots. See the :doc:`/dev/cephfs-snapshots` page for more information.
 
 Snapshots are known not to work with multi-MDS filesystems.
 
+For somewhat obscure implementation reasons, the kernel client only supports up
+to 400 snapshots (http://tracker.ceph.com/issues/21420).
+
 Snapshotting was blocked off with the "allow_new_snaps" flag prior to Firefly.
 
 Multiple filesystems within a Ceph cluster