HOST="192.168.12.1"
NEW_BASE="/mnt/ands/glusterfs/vg_ce3a7c1bb6da5c98ce4bb3e76aeacb8b"
GLUSTER_BIN="gluster"
DRYRUN=1          # set to 0 to actually run
GLUSTER_UID=107   # adjust if your gluster user has a different uid/gid

# get all volumes like vol_<uid>
VOLS=$($GLUSTER_BIN volume list | grep '^vol_')

for VOL in $VOLS; do
    # find bricks on this host
    # lines look like: "Brick2: 192.168.12.1:/var/lib/heketi/.../brick"
    mapfile -t OLDBRICKS < <($GLUSTER_BIN volume info "$VOL" \
        | grep "$HOST:" \
        | awk '{print $2}')

    # skip volumes that don't have a brick on this host
    if [ ${#OLDBRICKS[@]} -eq 0 ]; then
        continue
    fi

    for OLD in "${OLDBRICKS[@]}"; do
        BRICKID=$(echo "$OLD" | sed -n 's#.*/\(brick_[^/]*\)/brick#\1#p')
        if [ -z "$BRICKID" ]; then
            echo "WARN: could not extract brick ID from $OLD"
            continue
        fi
                                        
        NEW="$HOST:$NEW_BASE/$BRICKID"

        echo "=== volume: $VOL ==="
        echo "old brick: $OLD"
        echo "new brick: $NEW"

    
        $GLUSTER_BIN volume replace-brick "$VOL" "$OLD" "$NEW" commit force

    done
done