On 12/02/2015 02:02 PM, Axel Glienke wrote: > ok, thank you very much Gordon. > > but you know what the difference? > > if i do > 1. centos7 installation > 2. yum upgrade > 3. lvcreate -s ... > 4. reboot > > then i got the error. I'll try to recreate the problem on a new VM, but that doesn't make much sense. Including the required module isn't dependent on creating the snapshot as far as I can tell. If you can get dracut debug output from an affected system, I might be able to help. Without that, I can't think of anything else I can offer you. dracut --force --debug > /var/tmp/dracut.txt 2>&1 (Upload /var/tmp/dracut.txt to http://paste.fedoraproject.org/)