doc: mention how to initiate snapshot mirroring

Signed-off-by: Jos Collin <jcollin@redhat.com>

diff --git a/doc/cephfs/cephfs-mirroring.rst b/doc/cephfs/cephfs-mirroring.rst
index 1a1575482811d467aa51413f20bfdc86723e87fc..8f82c4275cc57d90d26f58d9adf6c5e94fd8a90d 100644 (file)
--- a/doc/cephfs/cephfs-mirroring.rst
+++ b/doc/cephfs/cephfs-mirroring.rst
@@ -258,6 +258,13 @@ e.g.::
 
 .. _cephfs_mirroring_mirroring_status:
 
+Snapshot Mirroring
+------------------
+
+To initiate snapshot mirroring, create a snapshot of the configured directory in the primary cluster::
+
+  $ mkdir -p /d0/d1/d2/.snap/snap1
+
 Mirroring Status
 ----------------