You have been subscribed to a public bug:
Creating a thin pool LV is allowed even when thin-provisioning-tools is
not installed. But deactivating, or activating, the VG fails.
I think the lvconvert tool, used to combine the two "thin LVs" into a
thin pool LV, should refuse to run if thin-provisioning-tools isn't
installed.
Steps to reproduce:
root@15-89:~# vgcreate vg /dev/vdb1
Volume group "vg" successfully created
root@15-89:~# vgs
VG #PV #LV #SN Attr VSize VFree
vg 1 0 0 wz--n- 40.00g 40.00g
root@15-89:~# lvcreate -n pool0 -l 90%VG vg
Logical volume "pool0" created.
root@15-89:~# lvcreate -n pool0meta -l 5%VG vg
Logical volume "pool0meta" created.
root@15-89:~# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync
Convert
pool0 vg -wi-a----- 36.00g
pool0meta vg -wi-a----- 2.00g
root@15-89:~# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 100 Jun 21 14:15 ./
drwxr-xr-x 20 root root 3820 Jun 21 14:15 ../
crw------- 1 root root 10, 236 Jun 21 13:15 control
lrwxrwxrwx 1 root root 7 Jun 21 14:14 vg-pool0 -> ../dm-0
lrwxrwxrwx 1 root root 7 Jun 21 14:15 vg-pool0meta -> ../dm-1
root@15-89:~# lvconvert --type thin-pool --poolmetadata vg/pool0meta vg/pool0
WARNING: Converting logical volume vg/pool0 and vg/pool0meta to pool's data
and metadata volumes.
THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
Do you really want to convert vg/pool0 and vg/pool0meta? [y/n]: y
Converted vg/pool0 to thin pool.
root@15-89:~# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 120 Jun 21 14:15 ./
drwxr-xr-x 20 root root 3840 Jun 21 14:15 ../
crw------- 1 root root 10, 236 Jun 21 13:15 control
lrwxrwxrwx 1 root root 7 Jun 21 14:15 vg-pool0 -> ../dm-2
lrwxrwxrwx 1 root root 7 Jun 21 14:15 vg-pool0_tdata -> ../dm-1
lrwxrwxrwx 1 root root 7 Jun 21 14:15 vg-pool0_tmeta -> ../dm-0
root@15-89:~# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move Log
Cpy%Sync Convert
[lvol0_pmspare] vg ewi------- 2.00g
pool0 vg twi-a-tz-- 36.00g 0.00 0.01
[pool0_tdata] vg Twi-ao---- 36.00g
[pool0_tmeta] vg ewi-ao---- 2.00g
If you now reboot the system, all that is gone:
root@15-89:~# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 60 Jun 21 14:28 ./
drwxr-xr-x 19 root root 3760 Jun 21 14:28 ../
crw------- 1 root root 10, 236 Jun 21 14:28 control
The same happens if you deactivate the VG (which the reboot undoubtedly
triggers). It fails because of a missing /usr/sbin/thin_check which is
provided by the thin-provisioning-tools package:
root@15-89:~# vgchange -a n
/usr/sbin/thin_check: execvp failed: No such file or directory
WARNING: Integrity check of metadata for pool vg/pool0 failed.
0 logical volume(s) in volume group "vg" now active
root@15-89:~# ll /dev/mapper/
total 0
drwxr-xr-x 2 root root 60 Jun 21 14:29 ./
drwxr-xr-x 19 root root 3760 Jun 21 14:29 ../
crw------- 1 root root 10, 236 Jun 21 14:28 control
** Affects: lvm2 (Ubuntu)
Importance: High
Status: Triaged
** Tags: architecture-ppc64le bugnameltc-150003 severity-high
targetmilestone-inin16042
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Missing thin-provisioning-tools prevent VG from being (de)activated
https://bugs.launchpad.net/bugs/1657646
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seeded packages, which is subscribed to lvm2 in Ubuntu.
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