Hello List,
when using below reproduced steps, lvm command show error info.
```
# pvcreate /dev/sda /dev/sdb
# vgcreate test /dev/sda /dev/sdb
# lvcreate --name main --size 200m test /dev/sda
# lvcreate --name fast --size 50m test /dev/sdb
# lvconvert -y --type cache --cachevol fast test/main
# lvs -a -o name,vgname,lvattr,origin,segtype,devices test
LV VG Attr Origin Type Devices
[fast] test Cwi-aoC--- linear /dev/sdb(0)
main test Cwi-a-C--- [main_corig] cache main_corig(0)
[main_corig] test owi-aoC--- linear /dev/sda(0)
# vgremove test --force
Logical volume "main" successfully removed
Assertion failed: can't _pv_write non-orphan PV (in VG )
Failed to remove physical volume "/dev/sdb" from volume group "test"
Volume group "test" not properly removed
# lvs # <== output none
# vgs # <== output none
# pvs
WARNING: PV /dev/sdb is marked in use but no VG was found using it.
WARNING: PV /dev/sdb might need repairing.
PV VGFmt Attr PSize PFree
/dev/sda lvm2 --- 300.00m 300.00m
/dev/sdb [unknown] lvm2 u-- 300.00m 0
```
rootcause analysis:
1>
why output: Assertion failed: can't _pv_write non-orphan PV (in VG )
_vgremove_single
vg_remove
vg_remove_direct
pv_write(vg->cmd, pv, 0)
pv_write
if (!allow_non_orphan &&
(!is_orphan_vg(pv->vg_name) || pv->pe_alloc_count)) {
log_error("Assertion failed: can't _pv_write non-orphan PV "
"(in VG %s)", pv_vg_name(pv));
return 0;
}
the pv->pe_alloc_count is non-zero.
2>
why pv->pe_alloc_count is non-zero.
_vgremove_single
process_each_lv_in_vg
/*
* Only let hidden LVs through if --all was used or the LVs
* were specifically named on the command line.
*/
if (!lvargs_supplied && !lv_is_visible(lvl->lv) && !arg_is_set(cmd, all_ARG)
&&
(!cmd->process_component_lvs || !lv_is_component(lvl->lv)))
continue;
cmd->process_component_lvs and lv_is_component(lvl->lv) are false,
then lv can't join in final_lvl and won't be removed later.
At last,
I can't find a good solution for this issue. the 112846ce0b01e5353 introduced
this issue.
one solution maybe to add CACHE_POOL_METADATA in lv->status when _read_lvnames
constructs lv.
Thanks.
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