LVM - 刪除 cinder volume 出現remove ioctl on failed: Device or resource busy
$ lvdisplay
--- Logical volume ---
LV Path /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
LV Name volume-8394a77f-c9b6-426d-b31d-33d0682b394f
VG Name cinder-volumes
LV UUID vWeepZ-rbPL-tKas-Om26-ziQg-F3vF-aINUXE
LV Write Access read/write
LV Creation host, time controller, 2016-05-30 11:59:02 +0800
LV Status available
# open 1
LV Size 1.00 GiB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
# 今天想刪除volume-8394a77f-c9b6-426d-b31d-33d0682b394f,結果報錯
$ lvremove /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
device-mapper: remove ioctl on failed: Device or resource busy
# 強制刪除也一樣
$ lvremove -f /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
device-mapper: remove ioctl on failed: Device or resource busy
# 可以看到open 的狀態為1,所以remove不掉
$ dmsetup info -c /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
Name Maj Min Stat Open Targ Event UUID
cinder--volumes-volume--8394a77f-c9b6-426d-b31d-33d0682b394f 252 0 L--w 1 1 0 LVM-88RRijIEC84Kmm9DX6LgMfpOHUrSGwakKfSSKW0lcdGctxXZjmupVUTxRu5BMCem
# 查詢看誰打開的
$ fuser -m 8394a77f-c9b6-426d-b31d-33d0682b394f
/dev/dm-0: 5222
# 可以知道所對應的device是/dev/dm-0,可能是被mount了,所以先試試umount
$umount /dev/dm-0
umount: /dev/dm-0: not mounted
# 最後應該是tgtd的問題了
$ tgtadm --op show --mode target|grep 8394a77f
Target 1: iqn.2010-10.org.openstack:volume-8394a77f-c9b6-426d-b31d-33d0682b394f
Backing store path: /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
# 刪除試試看
$ tgtadm --op show --mode target --op delete --tid 1
# 應該就可以正常刪除lv了
$ lvremove /dev/cinder-volumes/volume-8394a77f-c9b6-426d-b31d-33d0682b394f
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