How to increase dev/root size

Hello,
How can i increase dev/root size, becuase it is %99 full?

Filesystem      Size  Used Avail Use% Mounted on
rootfs           20G   19G  234M  99% /
/dev/root        20G   19G  234M  99% /
devtmpfs        7.8G  336K  7.8G   1% /dev
/dev/sda3       1.8T   34G  1.7T   2% /home
tmpfs           7.8G     0  7.8G   0% /dev/shm
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/named
/dev/root        20G   19G  234M  99% /var/named/chroot/var/named
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/named.conf
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/named.rfc1912.zones
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/rndc.key
/dev/root        20G   19G  234M  99% /var/named/chroot/usr/lib64/bind
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/named.iscdlv.key
/dev/root        20G   19G  234M  99% /var/named/chroot/etc/named.root.key

Hi canmese,

Were you able to fix you / partition filling up issue?  If not what you can do is move some stuff out of there and into your /home since you have 1+TB there.  A lot of people run into this issue not thinking about other files systems that grow quite large at times.  You can always move /var/lib/myql into something like /home/var_mysql.  That is if you have alot of databases.  Also make sure you check your /var/log directory for any old logs you can remove from there.  If you need instruction on moving /var/lib/mysql just let me know.  I do it all the time at work for customers.

Good luck!