Diskspace on /dev/mapper/boxone-root

[ubernissen]

How do I read used diskspace i % from / when I get this from

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df -hFilesystem            Size  Used Avail Use% Mounted on
/dev/mapper/boxone-root
                      221G   73G  138G  35% /
varrun                2,0G  3,5M  2,0G   1% /var/run
varlock               2,0G     0  2,0G   0% /var/lock
udev                  2,0G   56K  2,0G   1% /dev
devshm                2,0G     0  2,0G   0% /dev/shm
/dev/sdb1             236M   45M  179M  20% /boot

Normally I use

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df -h |grep $DISC |awk '{print $1}'
SIZE=`df -h|grep $DISC|awk '{print $2}'`
USED=`df -h|grep $DISC|awk '{print $3}'`
FREE=`df -h|grep $DISC|awk '{print $4}'`where $DISC is /dev/sdb1 or /dev/sdb2

/dev/mapper/boxone-root results in nothing!