ceph-volume: use fsync for dd command

fsync makes sure that data and metadata is actually written to device
being zapped before finishing.

Fixes: https://tracker.ceph.com/issues/39156
Signed-off-by: Rishabh Dave <ridave@redhat.com>

diff --git a/src/ceph-volume/ceph_volume/devices/lvm/zap.py b/src/ceph-volume/ceph_volume/devices/lvm/zap.py
index bca32ac8833961253ebdc2fa7753c8bbe7cf04d1..6e60614088d0f19d3731c75cd38a4033baa08825 100644 (file)
--- a/src/ceph-volume/ceph_volume/devices/lvm/zap.py
+++ b/src/ceph-volume/ceph_volume/devices/lvm/zap.py
@@ -66,6 +66,7 @@ def zap_data(path):
         'of={path}'.format(path=path),
         'bs=1M',
         'count=10',
+        'conv=fsync'
     ])