Quota
Set up
As root:
apt-get install quota quotatool
update /etc/fstab:
/dev/sdb1 /home ext4 usrquota,usrjquota=quota.user,jqfmt=vfsv0 0 0
Then run these commands:
touch /home/quota.user chmod 600 /home/quota.user mount -o remount /home quotacheck -avum quotaon -avu
Manage
To see usage and quotas for all users:
repquota -a
References
http://www.ubuntugeek.com/how-to-setup-disk-quotas-in-ubuntu.html
notes on journaled quotas: http://ubuntuforums.org/showthread.php?t=1014051&page=2