On 12/02/2015 12:05 PM, Axel Glienke wrote: > in journalctl i found: > modprobe: FATAL: Module dm-snapshot not found > ... > Can't process LV root_snap: snapshot target support missing from kernel I installed a very simple CentOS 7 system with an LVM root FS. Created a snapshot and rebooted, no problem. Updated dracut, then updated everything else and rebooted, no problem. As far as I can tell, dracut normally includes the entire kernel module tree under kernel/drivers/md, which should provide the dm-snapshot module required to complete the boot sequence. I can't determine what's causing the problem you see, but it doesn't appear to affect a standard installation. Try: dracut --force --debug > /var/tmp/dracut.txt 2>&1 Upload /var/tmp/dracut.txt to http://paste.fedoraproject.org/. I'll see if I spot anything useful.