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@xxxxxxxxxx>:
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@xxxxxxxxxx>:
On Wed, Dec 02, 2015 at 08:53:39PM +0100, Axel Glienke wrote:
Creating snapshot:
[root@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@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
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Grüße
Axel
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