psuedo script to reproduce outside of openstack/devstack:
*This omits the iscsi target creation/deletion steps.*
DATA_DIR=~/DATA
VOLUME_BACKING_FILE_SIZE=${VOLUME_BACKING_FILE_SIZE:-5130M}
VOLUME_GROUP=${VOLUME_GROUP:-stack-volumes}
VOLUME_BACKING_FILE=${VOLUME_BACKING_FILE:-$DATA_DIR/${VOLUME_GROUP}-backing-file}
if ! sudo vgs $VOLUME_GROUP; then
VOLUME_BACKING_FILE=${VOLUME_BACKING_FILE:-$DATA_DIR/${VOLUME_GROUP}-backing-file}
# Only create if the file doesn't already exists
[[ -f $VOLUME_BACKING_FILE ]] || truncate -s $VOLUME_BACKING_FILE_SIZE
$VOLUME_BACKING_FILE
DEV=`sudo losetup -f --show $VOLUME_BACKING_FILE`
# Only create if the loopback device doesn't contain $VOLUME_GROUP
if ! sudo vgs $VOLUME_GROUP; then sudo vgcreate $VOLUME_GROUP $DEV; fi
fi
lvcreate -L 2G -n "test-vol" $VOLUME_GROUP
lvcreate -L 2G --name "test-snap" --snapshot "test-vol"
dd count=0 if=/dev/zero of=test-vol count= bs=1M iflag=direct
oflag=direct
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https://bugs.launchpad.net/bugs/1023755
Title:
Precise kernel locks up while dd to /dev/mapper files > 1Gb (was:
Unable to delete volume)
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