Hi,
I'm using LVM, having / and /home as logical volumes and a backup script
creating a logical snapshot volume of each in the process.
Since I use gentoo (comming from arch), my backup script fails rather often
with the error message 'Can't remove open logical volume <volume>'. The script
worked fine on arch before. The partition setup did not change.
Sometimes it works fine, sometimes it just fails.
As a workaround, I let the script just lvremove the snapshot three times with
5 seconds sleeping between the tries and the overall success rate for the
script improved...
The chance is about 40% lvremove succeeds at a given time and doesn't seem to
in- or decrease when calling lvremove successively with a five second delay,
though if it fails once, it tends to fail again more often if called within
the next two or three seconds.
Here is an example of the command failing once more after the backup script
aborted. The second time it works. I did NOTHING but the commands listed below
in these 30 seconds or so: (note: dmsetup says "open: 0" in the first place!)
kira namor # dmsetup info -c vg-snap_root
Name Maj Min Stat Open Targ Event UUID
vg-snap_root 253 5 L--w 0 1 0 LVM-
ayg5GD1dYyrkkan1pLa8WszI7UrQpy9YE2ynOTtHoSNckKdehm3XMIgkw7p8z69X
kira namor # lvremove /dev/vg/snap_root
Can't remove open logical volume "snap_root"
kira namor # lsof /dev/vg/snap_root
kira namor # fuser -a /dev/vg/snap_root
/dev/vg/snap_root:
kira namor # lvremove /dev/vg/snap_root
Do you really want to remove active logical volume snap_root? [y/n]: y
Logical volume "snap_root" successfully removed
What I tried so far was:
-> calling: lvchange -an $SNAP_PARTITION #fails iff lvremove fails
-> updating to lvm2-2.02.56-r3 and updating the initramfs #fixes nothing
I have no idea what causes this random behavior.
Help much appreciated.
Regards,
Roman Naumann
