doc: RBD quick start guide will fail due to default image features

fix: http://tracker.ceph.com/issues/16999

Signed-off-by: songweibin <song.weibin@zte.com.cn>

diff --git a/doc/start/quick-rbd.rst b/doc/start/quick-rbd.rst
index 5534fa9e572e934e05f5aa0ff331a0d693762e62..837830b53a8a06f67d65d35672f1e1cab14365a4 100644 (file)
--- a/doc/start/quick-rbd.rst
+++ b/doc/start/quick-rbd.rst
@@ -62,7 +62,7 @@ Configure a Block Device
 
 #. On the ``ceph-client`` node, create a block device image. :: 
 
-       rbd create foo --size 4096 [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
+       rbd create foo --size 4096 --image-feature layering [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]
 
 #. On the ``ceph-client`` node, map the image to a block device. ::