# The name of the LVM archive to get data from
ARCHIVE=/etc/lvm/archive/xenvg_00685.vg

# Extract the first block of an lv to a file named part-$lv
getfirstblock () {
lvname="$1"
offset=$(grep -A16 $'\t'$lvname $ARCHIVE  | grep pv0 | cut -f 2 -d ,);
if [ -z "$offset" ]; then echo "WARNING: LV not found";
else
echo "Extracting $lvname from offset $offset"
dd if=/dev/mapper/36090a028407d6e2b2589a45cdb971489 of=part-$lvname bs=1M skip=$(( $offset * 8192 + 384 )) bs=512 count=1;
fi
}

# Generate a dd command to copy the lv data to /dev/xenvg/$lv
ddlv () {
lvname="$1"
offset=$(grep -A16 $'\t'$lvname $ARCHIVE  | grep pv0 | cut -f 2 -d ,);
length=$(( $(grep -A16 $'\t'$lvname $ARCHIVE  | grep extent_count | cut -f 2 -d = | cut -f 1 -d '#') ));
if [ -z "$offset" ]; then echo "# WARNING: LV $lvname not found";
else
echo "#Extracting $lvname from offset $offset with length $length"
echo dd if=/dev/mapper/36090a028407d6e2b2589a45cdb971489 of=/dev/xenvg/$lvname bs=1M skip=$(( $offset * 8192 + 384 )) ibs=512 obs=4194304 count=$length
fi
}