On Thu, 31 Jan 2013, Stefan G. Weichinger wrote:
I would also like to see improved scripts, I have the issue at one
client that the LVM-snapshots aren't correctly removed sometimes ...
that leads to non-working backups and dozens of lurking snapshots ...
I had a lot of problems with LVM snapshots that would not go away, so I
wrote a script deleteLV that repeatedly waits a little while then tries
again. This has worked fine, though i have a suspicion that SuSE fixed the
bug I was working round at exactly the same time as I installed my script!
The script deleteLV is appended to this message in case anyone finds it
useful.
Bob Vickers
#! /bin/bash
# Delete an LVM logical volume (typically used for a snapshot that won't go
# away). See
# https://bugzilla.novell.com/show_bug.cgi?id=642296
# Author: Bob Vickers, Royal Holloway University of london
set -o nounset
export PATH=/sbin:/usr/sbin:/bin:/usr/bin
usage=\
" deleteLV [-n maxTries] [-t timetowait] LVdevice...
-n max number of tries (default 10)
-t time to wait after sync (default 10 seconds)"
#
# Parse the command options
declare -i maxtries=10 delay=10
ERRFLAG=OK
OPTIND=1
while getopts n:t: OPTION
do
case $OPTION in
n) maxtries=$OPTARG;;
t) delay=$OPTARG;;
\?) ERRFLAG=BAD;;
esac
done
shift `expr $OPTIND - 1`
#
# Exit with a usage message if the syntax is wrong.
#
if [ $ERRFLAG != OK -o $# -eq 0 ]
then
echo 2>&1 "$0: usage:"
echo 2>&1 "$usage"
exit 1
fi
declare -i ntries
for lv in "$@"
do
if lvs $lv >/dev/null
then
# We have a valid LVM logical volume, so repeatedly try to delete it.
ntries=0
while (( $ntries < $maxtries ))
do
ntries=$(( $ntries + 1 ))
echo >&2 "$0: Removing $lv attempt $ntries"
udevadm settle
sync
sleep $delay
lvremove -f $lv && break
done
if lvs $lv >/dev/null 2>/dev/null
then
echo >&2 "$0: FAILED to remove $lv after $ntries attempts"
else
echo >&2 "$0: Successfully removed $lv after $ntries attempt(s)"
fi
else
echo >&2 "$0: $lv is not an LVM logical volume"
fi
done
