In order to implement Disk Quota on Linux Systems, you would need to remount the file system with usrquota and grpquota options.
/dev/VolGroup00/LogVol02 /home ext3 defaults,usrquota,grpquota 1 2
mount -o remount /home
The next step is to initialize the quota database :
quotacheck -cug /home
Now Generate the table of current disk usage :
In order to assign quota to a user run :
Verify User Quota has been set :