I removed some logs and videos and now the Admin console is responding again 
and yes I have the /opt/kaltura/web in the root partition, but not sure how to change to a different one:
I have an additional partition that I want to use for the videos:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 30G 8.5G 20G 30% /
/dev/sdb1 1.4T 70M 1.3T 1% /mnt
Can you help me with changing the /opt/kaltura/web to the partition /dev/sdb1?
BTW this is a all in one installation for Kaltura
Thanks!
Juan Pablo