Comment # 9 on bug 919284 from han l2

> cat /etc/lvm/lvm.conf | grep use_lvmetad

    use_lvmetad = 1

> If you have changed this value, did you recreate the initrd afterwards?

Yes I changed it to that value.

I had to also enable/start lvm2-lvmetad.socket.

Without these, the system won't boot -- even with my extra systemd unit.