Package: lvm2
Version: 2.02.66-5
When i want to restore a logical volume's content from one of it's
snapshots you can use the command:
lvconvert --merge vg/lv-snap
according to manpage:
"lvconvert --merge vg00/lvol1_snap"
merges "vg00/lvol1_snap" into its origin.
Problem:
Can't expand LV test: snapshot target support missing from kernel?
Reproducible:
100%
Example:
% dd if=/dev/zero of=/var/tmp/disk bs=1M count=10
% losetup /dev/loop5 /var/tmp/disk
% pvcreate /dev/loop5
Physical volume "/dev/loop5" successfully created
% vgcreate vg0 /dev/loop5
Volume group "vg0" successfully created
% lvcreate --name test --extents 1 vg0
Logical volume "test" created
% lvcreate --snapshot vg0/test -n test-snap --extents 1
Logical volume "test-snap" created
% md5sum /dev/vg0/test{,-snap}
b5cfa9d6c8febd618f91ac2843d50a1c /dev/vg0/test
b5cfa9d6c8febd618f91ac2843d50a1c /dev/vg0/test-snap
% echo "changing-some-stuff" > /dev/vg0/test
% md5sum /dev/vg0/test{,-snap}
0a03546bcdfe5d9f3853c200fffe41f8 /dev/vg0/test
b5cfa9d6c8febd618f91ac2843d50a1c /dev/vg0/test-snap
% lvs vg0
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
test vg0 owi-a- 4.00m
test-snap vg0 swi-a- 4.00m test 0.29
% lvconvert --merge vg0/test-snap
Can't expand LV test: snapshot target support missing from kernel?
Failed to suspend origin test
% lvchange --available n vg0/test
% lvs vg0
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
test vg0 owi--- 4.00m
test-snap vg0 swi--- 4.00m test
% lvconvert --merge vg0/test-snap
Merging of volume test-snap started.
Conversion starts after activation.
% lvchange --available y vg0/test
Can't expand LV test: snapshot target support missing from kernel?
% lvs vg0
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
test vg0 Owi--- 4.00m
At this point LV ,test' can't be accessed anymore.
*****
* The only solution here is to restore the LVM metadata for this VG
* from /etc/lvm/archive or to recreate the LV with option --zero n
* on the same extends as before (check with lvs -o +seg_pe_ranges).
*****
Expected behaviour:
% lvconvert --merge /dev/vg0/test-snap
Merging of volume test-snap started.
test: Merged: 0,1%
Merge of snapshot into logical volume test has finished.
Logical volume "test-snap" successfully removed
% md5sum /dev/vg0/test
b5cfa9d6c8febd618f91ac2843d50a1c /dev/vg0/test
More Info:
% lsmod|grep snap
dm_snapshot 18481 0
dm_mod 53754 55 dm_snapshot,dm_mirror,dm_log
% dpkg -l | grep linux-image
ii linux-image-2.6.32-5-amd64 2.6.32-30
ii linux-image-amd64 2.6.32+29
% uname -a
Linux han-solo 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64
GNU/Linux
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