Hello,
thank you for valuable information.
On 28.11.2013 00:06, Dave Chinner wrote:
Running a custom built 3.4.63 kernel with a bunch of out of tree
modules installed. can you reproduce this on a vanilla 3.12 kernel?
Ok, we'll try.
The script is full of bugs, and i don't have time to debug it - it
hard codes /dev/sda in places despite taking the device as a CLI
parameter. It has hard coded mount points. It sometimes fails to
make the filesystem on the base LV after it's been created.
start_snap() appears to fail for some reason, as it doesn't result
in mounted snapshots. stop_snap fails as well:
Starting snap19 : Thursday 28 November 10:01:26 EST 2013
Logical volume lv1+snap19 converted to snapshot.
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ OK ] lv1+snap19 activated.
Starting time : 37 s.
---------------------------
Stopping snap0 : Thursday 28 November 10:02:06 EST 2013
[ FAIL ] Can't umount snapshot
[ FAIL ] Can't remove snapshot
[ FAIL ] lv0+snap00 still active !!!
[ OK ] lv0+snap00 umounted.
Stopping time : 0 s.
I've got no idea is this is intended behaviour, but it sure doesn't
seem right to me...
Yes, sometimes umount and remove operations fail. This script tests
system stability and these messages are debug info only.
I've fixed it. Now it takes two parameters: device and mount point.
#!/bin/bash
DEV=$1
MOUNTPOINT=$2
function print_usage()
{
echo "Usage: $0 device mountpoint"
exit 1;
}
if [ -z "$DEV" ]; then
print_usage
fi
if [ -z "$MOUNTPOINT" ]; then
print_usage
fi
function overload()
{
COUNT=$1
temp_COUNT=$COUNT;
while [ -f ./run ]; do
while [ $COUNT -ge 1 ]; do
if [ -f ./run ]; then
dd bs=1024 count=102400 if=/dev/zero of=/$2/"_"$COUNT &>
/dev/null
fi;
let COUNT=$COUNT-1
done;
rm $2/*;
COUNT=$temp_COUNT;
done;
}
function create_vg()
{
#create physical volume
pvcreate $DEV
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create physical volume"
exit 1
fi
#create volume group
vgcreate -v -s 32M $VG $DEV
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create volume group"
exit 1
fi
}
function create_lv()
{
local LV="$1"
#create logical volume
lvcreate -l 500 -n "$VG+$LV" "$VG"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create LV"
exit 1
fi
mkfs -t xfs -f -l lazy-count=0 /dev/$VG/"$VG+$LV" &>/dev/null
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Can't create filesystem"
exit 1
fi
}
function create_snapshots()
{
for ((i=0; i < 20; i++)); do
if [[ $i -lt 10 ]]; then
lvcreate -l "64" -n "snap0$i" "$VG"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create snapshot LV"
exit 1
fi
else
lvcreate -l "64" -n "snap$i" "$VG"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create snapshot LV"
exit 1
fi
fi
done
}
function assign_snapshots()
{
for ((i=0; i < 20; i++)); do
if [[ $i -lt 10 ]]; then
lvrename "$VG" "snap0$i" "lv0+snap0$i"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to rename snapshot LV"
exit 1
fi
else
lvrename "$VG" "snap$i" "lv1+snap$i"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to rename snapshot LV"
exit 1
fi
fi
done
}
function mount_volume()
{
local MVG=$1
local MLV=$2
mkdir -p "$MOUNTPOINT/$MVG+$MLV"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to create mounting point"
exit 1
fi
mount -t xfs -o
defaults,usrquota,grpquota,nouuid,noatime,nodiratime
"/dev/$MVG/$MVG+$MLV" "$MOUNTPOINT/$MVG+$MLV"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Unable to mount LV"
exit 1
fi
}
function start_overload()
{
touch ./run
mkdir -p "$MOUNTPOINT/$1+$2/test"
overload 50 "$MOUNTPOINT/$1+$2/test" $3 &
echo "overload $1 $MOUNTPOINT/$1+$2/test $3 &"
sleep 4;
echo "[ OK ] copying files to $2 started"
}
function get_snapshot_status()
{
lvdisplay /dev/$1/$2 | awk ' $0~"LV snapshot status" { print $4 } '
}
function remove_snapshot()
{
local LVG=$1
local LLV=$2
local LSNAP=$3
umount "$MOUNTPOINT/$LSNAP"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Can't umount snapshot"
fi
lvremove -sf "/dev/$LVG/$LSNAP"
if [[ $? -gt 0 ]]; then
echo "[ FAIL ] Can't remove snapshot"
fi
}
function create_snapshot()
{
local LVG=$1
local LLV=$2
local LSNAP=$3
for((it=0; it<7; it++)); do
local ERROR=0
local STATUS=`get_snapshot_status $LVG $LSNAP`
if [[ "$STATUS" == "active" ]]; then
remove_snapshot $LVG "$LLV+$LSNAP"
fi
STATUS=`get_snapshot_status $LVG $LSNAP`
if [[ "$STATUS" == "active" ]]; then
remove_snapshot $LVG "$LLV+$LSNAP"
fi
CHUNKSIZE=512
for ((ile=0;ile<it/2;ile++)); do
CHUNKSIZE=$((CHUNKSIZE/2))
done
lvconvert -s -c $CHUNKSIZE "/dev/$LVG/$LVG+$LLV" "/dev/$LVG/$LSNAP"
if [[ $? -gt 0 ]]; then
ERROR=1
fi
#mount snapshot
mkdir -p "$MOUNTPOINT/$LSNAP"
mount -t xfs -o nouuid,noatime "/dev/$LVG/$LSNAP"
"$MOUNTPOINT/$LSNAP"
if [[ $? -gt 0 ]]; then
ERROR=2
fi
create_time=`date "+%Y-%m-%d %H:%M:%S"`
if [ $ERROR -ne 0 ]; then
remove_snapshot $LVG $LLV $LSNAP
sleep 5
else
break;
fi
done
}
function start_snap()
{
local i;
for((i=0; i<20; i++)); do
echo "Starting snap$i : `date`"
local START=`date +%s`
if [[ $i -lt 10 ]]; then
snapname="lv0+snap0"$i
create_snapshot $VG "lv0" $snapname
else
snapname="lv1+snap"$i
create_snapshot $VG "lv1" $snapname
fi
if [ -z "`lvs | grep $snapname | grep $VG+lv`" ]; then
echo "[ FAIL ] $snapname not activated !!!"
else
echo "[ OK ] $snapname activated."
fi
if [ -z "`mount | grep $snapname`" ]; then
echo "[ FAIL ] $snapname not mounted !!!" >> $LOGFILE
else
echo "[ OK ] $snapname mounted."
fi
local STOP=$[`date +%s`-$START]
echo "Starting time : $STOP s."
echo "---------------------------"
sleep 2
done;
}
function stop_snap()
{
local i
for((i=0; i<20; i++)); do
echo "Stopping snap$i : `date`"
local START=`date +%s`
if [[ $i -lt 10 ]]; then
snapname="lv0+snap0"$i
remove_snapshot $VG "lv0" $snapname
else
snapname="lv1+snap"$i
remove_snapshot $VG "lv1" $snapname
fi
if [ "`lvs | grep $snapname | grep $VG+lv`" ]; then
echo "[ FAIL ] $snapname still active !!!"
else
echo "[ OK ] $snapname deactivated."
fi;
if [ "`mount | grep $snapname`" ]; then
echo "[ FAIL ] $snapname still mounted !!!" >> $LOGFILE
else
echo "[ OK ] $snapname umounted."
fi;
local STOP=$[`date +%s`-$START]
echo "Stopping time : $STOP s."
echo "---------------------------"
sleep 2
done;
}
VG="vg0"
echo "-------- Creating $VG on $DEV..."
create_vg
echo "[ OK ] Volume group created successfully"
echo "-------- Creating logical volumes on $VG..."
create_lv "lv0"
create_lv "lv1"
echo "[ OK ] Logical volumes created successfully"
echo "-------- Mounting logical volumes..."
mount_volume "$VG" "lv0"
mount_volume "$VG" "lv1"
echo "[ OK ] Logical volumes mounted successfully"
echo "-------- Creating snapshots..."
create_snapshots
echo "[ OK ] Snapshots created successfully"
echo "-------- Assigning snapshots..."
assign_snapshots
echo "[ OK ] Snapshots assigned successfully"
echo "-------- Start overload..."
start_overload "$VG" "lv0"
start_overload "$VG" "lv1"
while true; do
start_snap 2> /dev/null
stop_snap 2> /dev/null
done
rm ./run
--
Best regards
Arkadiusz Bubała
Open-E Poland Sp. z o.o.
www.open-e.com
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