Merge PR ceph#19206 into master

* refs/pull/19206/head: doc: add pre-requisite to enable CephFS snapshot Reviewed-by: Patrick Donnelly <[email protected]> Reviewed-by: Zheng Yan <[email protected]>
zmc · Nov 28, 2017 · 38f051c · 38f051c
2 parents 6a9e622 + 93f9007
commit 38f051c
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diff --git a/doc/dev/cephfs-snapshots.rst b/doc/dev/cephfs-snapshots.rst
@@ -33,6 +33,14 @@ Important Data Structures
 
 Creating a snapshot
 -------------------
+Because CephFS snapshot currently is an experimental feature, we are supposed 
+to enable it explicitly by the command below before testing.
+
+.. code::
+
+       $ ceph fs set <fs_name> allow_new_snaps true --yes-i-really-mean-it
+
+
 To make a snapshot on directory "/1/2/3/foo", the client invokes "mkdir" on
 "/1/2/3/foo/.snap" directory. This is transmitted to the MDS Server as a
 CEPH_MDS_OP_MKSNAP-tagged `MClientRequest`, and initially handled in