diff --git a/src/ceph-volume/ceph_volume/devices/lvm/common.py b/src/ceph-volume/ceph_volume/devices/lvm/common.py
index 06fc33541a3..6cd8c59b886 100644
--- a/src/ceph-volume/ceph_volume/devices/lvm/common.py
+++ b/src/ceph-volume/ceph_volume/devices/lvm/common.py
@@ -66,6 +66,7 @@ def common_parser(prog, description):
         '--data-slots',
         help=('Intended number of slots on data device. The new OSD gets one'
               'of those slots or 1/nth of the available capacity'),
+        type=int,
         default=1,
     )
 
@@ -110,6 +111,7 @@ def common_parser(prog, description):
         dest='block_db_slots',
         help=('Intended number of slots on db device. The new OSD gets one'
               'of those slots or 1/nth of the available capacity'),
+        type=int,
         default=1,
     )
 
@@ -131,6 +133,7 @@ def common_parser(prog, description):
         dest='block_wal_slots',
         help=('Intended number of slots on wal device. The new OSD gets one'
               'of those slots or 1/nth of the available capacity'),
+        type=int,
         default=1,
     )
 
diff --git a/src/ceph-volume/ceph_volume/devices/lvm/prepare.py b/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
index c602a705fb9..44401094174 100644
--- a/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
+++ b/src/ceph-volume/ceph_volume/devices/lvm/prepare.py
@@ -178,6 +178,9 @@ class Prepare(object):
             kwargs = {
                 'device': device_name,
                 'tags': tags,
+                'slots': getattr(self.args,
+                                 'block_{}_slots'.format(device_type),
+                                 1),
             }
             if size != 0:
                 kwargs['size'] = disk.Size.parse(size)
@@ -213,6 +216,7 @@ class Prepare(object):
             lv_name_prefix = "osd-{}".format(device_type)
             kwargs = {'device': device,
                       'tags': {'ceph.type': device_type},
+                      'slots': self.args.data_slots,
                      }
             logger.debug('data device size: {}'.format(self.args.data_size))
             if self.args.data_size != 0: