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. if i do your way 1. centos7 installtion 2. snapshot & reboot 3. yum upgrade 4. reboot then the system start. Zitat von Gordon Messmer <gordon.messmer at gmail.com>: > 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. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos Grüße Axel