There is no reason to do discard durink mkfs, as the filesystem is on a newly allocated device anyway. Discard is a slow operation, so this may help initial startup a bit, especially if you use a larger thin pool. Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson) Upstream-commit: 42708181b1976a768428568e664c566717ade8c4 Component: engine