Ok, kernel needs the module dm-snapshot for snapshot support, but the modules is storage on a snapshoted-lv ... you can't make a root_snapshot with centos? Zitat von Axel Glienke <axel at glienke.cc>: > in journalctl i found: > modprobe: FATAL: Module dm-snapshot not found > ... > Can't process LV root_snap: snapshot target support missing from kernel > > > Zitat von Tru Huynh <tru at centos.org>: > >> On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote: >>> Creating snapshot: >>> >>> [root at lvmtest ~]# lvcreate -L5G -s -n root_snap /dev/centos/root >>> Reducing COW size 5,00 GiB down to maximum usable size 2,94 GiB. >>> Logical volume "root_snap" created. >>> [root at lvmtest ~]# lvs >>> LV VG Attr LSize Pool Origin Data% Meta% Move >>> Log Cpy%Sync Convert >>> root centos owi-aos--- 2,93g >>> root_snap centos swi-a-s--- 2,94g root 0,00 >>> swap centos -wi-ao---- 1,00g >>> >>> --- reboot --- >>> >>> dracut shell (missing /dev/centos/root) >>> >>> cat proc/cmdline: >>> BOOT_IMAGE=/vmlinuz-3.10.0-229.20.1.el7.x86_64 >>> root=/dev/mapper/centos_root ro rd.lvm.lv=centos/root >>> rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=de_DE.UTF-8 >>> systemd.debug >> >> shouldn't you have a new grub entry with: >> root=/dev/mapper/root_snap rd.lvm.lv=centos/root_snap >> >> Tru >> >> -- >> Tru Huynh >> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B > > > > Grüße > > Axel > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos Grüße Axel