Just noticed that systemd automatically mounts devices again
allthough I've manually umounted them.

Here is what I did

$ mount | grep local
/dev/mapper/vg0-local on /mnt/local type ext4 (rw,relatime,data=ordered)

## umount and disable that lvm device
$ umount /mnt/local
$ lvchange -an vg0/local

 systemd[1]: Stopping File System Check on /dev/vg0/local...
 systemd[1]: Stopped File System Check on /dev/vg0/local.

## enable device again
$ lvchange -ay vg0/local

 systemd[1]: Found device /dev/mapper/vg0-local.
 systemd[1]: Found device
/dev/disk/by-uuid/177a415d-174d-4c30-8897-5502c0419ef8.
 systemd[1]: Found device
/dev/disk/by-id/dm-uuid-LVM-uF33oY4c9yu00EPAP42a8A2XZCfQTRRPGfiv0cNZRwPKIRJnOboscsc1z60174dd.
 systemd[1]: Found device /dev/disk/by-id/dm-name-vg0-local.
 systemd[1]: Found device /dev/dm-0.
 systemd[1]: Found device /sys/devices/virtual/block/dm-0.
 systemd[1]: Starting File System Check on /dev/vg0/local...
 systemd-fsck[6386]: /dev/mapper/vg0-local: clean, 648240/3276800 files,
9308645/13107200 blocks
 systemd[1]: Started File System Check on /dev/vg0/local.
 systemd[1]: Mounting /mnt/local...
 kernel: [ 5542.579700] EXT4-fs (dm-0): mounted filesystem with ordered data
mode. Opts: acl,user_xattr
 systemd[1]: Mounted /mnt/local.

$ mount | grep local
/dev/mapper/vg0-local on /mnt/local type ext4 (rw,relatime,data=ordered)


So what kind of automount is this? How to disable this odd
behaviour?