fix typo in ceph-volume lvm prepare help

Signed-off-by: Jeffrey Zhang <zhang.lei.fly@gmail.com>
(cherry picked from commit d65b8844d16d71df01b57f368badc100db505506)

diff --git a/src/ceph-volume/ceph_volume/devices/lvm/prepare.py b/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
index daf5ff6a8d5ac7dcf6d434f5db25abe6d55e9b0c..641eb6f18624f22a083a7551300f03087589d9a3 100644 (file)
--- a/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
+++ b/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
@@ -328,7 +328,7 @@ class Prepare(object):
 
         Optionally, can consume db and wal devices or logical volumes:
 
-            ceph-volume lvm prepare --data {vg/lv} --block.wal {device} --block-db {vg/lv}
+            ceph-volume lvm prepare --data {vg/lv} --block.wal {device} --block.db {vg/lv}
         """)
         parser = prepare_parser(
             prog='ceph-volume lvm prepare',