[linux-lvm] Problem to remove LVM snaphots

[François Valenduc]

Le 19/04/10 01:04, Phillip Susi a écrit :
> On 04/18/2010 04:54 AM, François Valenduc wrote:
>> Hello everybody,
>>
>> I am using gentoo and I use LVM snapshots to make backups of my system.
>> Unfortunately, I always have a problem to remove these. LVM always
>> complains that it can't remove an open logical volume. However, the
>> snapshot is unmounted when I try to remove it. It seems it's only
>> possible to remove the snapshot if the corresponding volume is
>> deactivated. So, I am forced to boot on a live cd to remove the snapshot
>> of my root partition. Is this really normal ?
> 
> No, it is not normal.  Obviously something on your system has the
> snapshot open.  Perhaps it is being auto mounted?
> 
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> 
I would really like to know the process which has the snapshot open.The
script I use to backup my system is the following:

#!/bin/sh
logrotate -v -f /etc/logrotate.conf
vgcfgbackup
lvcreate -L1G -n backup -s /dev/gentoo/root
if [ $? = 0 ]; then
        if [ ! -e /mnt/backup ]; then
                mkdir /mnt/backup
        fi
        mount -o ro /dev/gentoo/backup /mnt/backup
        cd /mnt/backup
        NAME="/home/francois/Backup/gentoo_64_$(date +%F).tar.bz2"
        tar cvfpj ${NAME} --exclude=tmp/* *
        cd /
        umount /mnt/backup
        if [ $? = 0 ]; then
                sync
                lvremove -f gentoo/backup
        fi
fi


So, the snaphot is clearly unmounted before I try to remove it. But I
can almost never remove the snaphot. In fact, I have noticed that if I
don't use the "-f" option, I can remove the snapshot but it always fails
if I use it. But, I would like to use my script without any confirmation
message.

François