Shell Programming and Scripting

I'm writting a script that will get the logical volumes from a volume group and check for mirroring. I'm using a while read line command. I need to be able to count the columns for the output and if it is <= 3 save the logical volume to a file and if it is > 3 continue. How do I capture the number of collumns in the line? Here is what I have;

Code:

lsvg -o|lsvg -i -l|awk '{print $1}' >/tmp/lvols.txt

Code:

cat /tmp/lvols.txt |while read line
do
if [[ $line == rootvg: || $line == LV ]]
then
continue
else
lslv -m $line
fi
done

NOTE: lslv -m will display LP numbers (all of them for the lv) sample output below of non-mirrored logical volume

Code:

hd3:/tmp
LP    PP1  PV1               PP2  PV2               PP3  PV3
0001  0264 hdisk0
0002  0265 hdisk0
0003  0266 hdisk0
0004  0267 hdisk0
0005  0268 hdisk0

Something like this:

Code:

lslv -m | awk 'NF < 4'