1) Enter Single user Mode:
# init 1
2) Edit your /etc/fstab file
The /etc/fstab file lists all the partitions that need to be auto-mounted when the system boots. Edit and add “usrquota” option to the partition that you want to have quota enable
LABEL=/home /home ext3 defaults,usrquota 1 2
3) Remount your partition
# mount -o remount /home
4) Come out of single user mode
# Exit
5) Create quota file
The uppermost directory of the filesystem needs to have an aquota.user file (defines quotas by user) and an aquota.group file (defines quotas by group), or both.
# touch /home/aquota.user
# chmod 600 /home/aquota.user
5) Initialize the user quota
# quotacheck -vagum
6) Edit the quota for a user
# edquota -u nikesh
The command will invoke the vi editor.
Disk quotas for user nikesh (uid 503):
Filesystem blocks soft hard inodes soft hard
/dev/hda3 24 0 0 7 0 0
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source:http://linuxpoison.blogspot.com/2007/10/135781758014340.html