###To verify that the quota is enabled in the kernel###
#grep CONFIG_QUOTA /boot/config-`uname -r`

CONFIG_QUOTA=y
CONFIG_QUOTA_NETLINK_INTERFACE=y
# CONFIG_QUOTA_DEBUG is not set
CONFIG_QUOTA_TREE=y
CONFIG_QUOTACTL=y
[root@rajat rajat]#

Create user :
useradd some_user
passwd latarEdit /etc/fstab :
From :
/dev/sdaX /home ext3 defaults 1 2
To :
/dev/sdaX /home ext3 defaults,usrquota,grpquota 1 2Remount the disk (make sure it’s not in use) :
mount -o remount /home

Check if usrquota and grpquota are enabled :
mount | grep /home

Create quota files :
quotacheck -cvug /home

This creates /home/aquota.user and /home/aquota.group

Check quota :
#quotacheck -avug

Enable quota for user1 :
edquota user1
Edit soft and hard limits (1000 = 1 MB) or inode values.

Check the quota for user1 :
quota user1

Enable quota :
quotaon -avug

In addition :

Through a cron, run everynight when the filesystem is not used :
quotaoff -avug && quotacheck -avug && quotaon –avug

Get quota stats :
repquota -a