4 DISK=/dev/mapper/36090a028407d6e2b2589a45cdb971489
6 # The name of the LVM archive to get data from
7 ARCHIVE=/etc/lvm/archive/xenvg_00685.vg
9 # Extract the first block of an lv to a file named part-$lv
12 offset=$(grep -A16 $'\t'$lvname $ARCHIVE | grep pv0 | cut -f 2 -d ,);
13 if [ -z "$offset" ]; then echo "WARNING: LV not found";
15 echo "Extracting $lvname from offset $offset"
16 dd if=$DISK of=part-$lvname bs=1M skip=$(( $offset * 8192 + 384 )) bs=512 count=1;
21 perl -ne 'print if ( /^(\s*)'"$1"' \{/ ... /^$1\}/ )' $ARCHIVE
24 perl -ne 'print if ( /^(\s*)segment2 \{/ ... /^$1\}/ )'
28 # Generate a dd command to copy the LV data to /dev/xenvg/$lv
29 # Only works for single-segment LVs.
32 if ! lvinfo $lvname | grep -q 'segment_count = 1'; then
33 echo "# WARNING: LV $lvname has more than one segment, skipping" >&2
36 offset=$(lvinfo $lvname | perl -lne 'print $1 if (/"pv0", ([0-9]+)/)')
37 length=$(lvinfo $lvname | perl -lne 'print $1 if (/extent_count = ([0-9]+)/)')
39 if [ -z "$offset" ]; then
40 echo "# WARNING: LV $lvname not found";
42 echo "# Extracting $lvname from offset $offset PEs with length $length PEs"
43 echo dd if=$DISK of=/dev/xenvg/$lvname \
44 skip=$(( $offset * 64 + 3 )) bs=64K count=$(( $length * 64 ))
48 # Generate a dd command to copy the LV data for the second segment.
51 if ! lvinfo $lvname | grep -q 'segment_count = 2'; then
52 echo "# WARNING: LV $lvname has other than two segments, skipping" >&2
55 offset=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/"pv0", ([0-9]+)/)')
56 length=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/extent_count = ([0-9]+)/)')
57 seek=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/start_extent = ([0-9]+)/)')
59 if [ -z "$offset" ]; then
60 echo "# WARNING: LV $lvname not found";
62 echo "# Extracting $lvname segment 2 from offset $offset PEs with length $length PEs"
63 echo dd if=$DISK of=/dev/xenvg/$lvname bs=64K \
64 skip=$(($offset*64 + 3)) count=$(($length*64)) seek=$(($seek*64))